User's Guide Process Calibrator Multimeter Model CMM-17 Remote SCAN SHIFT AUTO @OFF JK OUT TE RS SBY ms Level ACDC C F k Hz 88888 4-20 0-20 m µ AV sec MAX AVGMIN ACDC 88888 C 0-20 4-20 F 0C m µ AV sec Mk Ù Hz Contents Warranty and Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Output – Setup and output a process calibration signal Input – ACV and Frequency measurements Process Calibrator / Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Introduction Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Display Description Slide Switch Rotary Switch Input and Output Terminals Push-buttons Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Input Operation Output Operation Power-on Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Entering the setup mode Factory Defaults Baud Rate Parity Check Data Bits Echo Print only Percentage scale for 4-20mA or 0-20mA Minimum Frequency measurements Beeper Frequency Temperature Units (C/F) Data Hold / Refresh Hold Auto power off Backlit Display SCAN and RAMP Output Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Auto SCAN Output Auto RAMP Output Square Wave Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Output Standby Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Overload Alert for Voltage Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Advanced Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Dynamic Recording (MIN – MAX – AVG) Data Hold (Manual Trigger) Refresh Hold (Auto Trigger) Relative mode (Zero) 1 ms Peak Hold Remote PC Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Multi-Display Multimeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Hz button DUAL button Temperature Measurement Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 General Specifications Input Specifications Output Specifications Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 Service Battery Charging Battery Replacement Fuse Replacement Cleaning 2 CMM-17 Version 2.0 October 2004 Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for three years from date of shipment (a six month limited warranty applies to sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact information. A Return Authorization (RA) number must be issued before any product is returned to Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or oral, is expressed or implied. Support Hotline (781) 890-7440 Tech support: Ext. 200; Email: [email protected] Repair/Returns: Ext. 210; Email: [email protected] Website: www.extech.com Copyright © 2004 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form. SAFETY INFORMATION A WARNING identifies conditions and actions that may pose a hazard to the user; a CAUTION identifies conditions and actions that may damage this device. Table 1 - International Electrical Symbols AC - Alternating Current DC - Direct Current AC and DC - Alternating and Direct Current Ground Double Insulation See Explanation In The Manual 3 CMM-17 Version 2.0 October 2004 SAFETY INFORMATION Warnings and Cautions To avoid electric shock, injury, or damage to this instrument and ensure that you use the meter safely, follow the safety guidelines listed below: • Read this operation manual completely before using this device and follow all safety instructions. • This device is for indoor use (altitude up to 2,000 m). • Use the device only as specified in this manual; otherwise, the protection provided by the meter may be impaired. • Never measure Voltage when the current measurement is selected. • Do not use this device if it appears damaged. • Inspect the leads for damaged insulation or exposed metal. Replace damaged leads. • Disconnect the power and discharge all high-voltage capacitors before testing in the resistance, continuity, or diode modes. • Use caution when working above 70V DC or 33VRMS and 46.7V peak, such voltages pose a shock hazard. • Always keep your hands behind the protective guard of the probe while measuring. • Select the proper function and disconnect the test leads from test points before changing functions. • Do not mix battery types. Always use specified battery. • The meter is safety-certified in compliance with EN61010 (IEC 1010-1, IEC 1010-2-031) Installation Category ΙΙ 250V Pollution Degree 2. In order to maintain its insulation properties, please be sure to use compatible test probes. • In an R.F field the supplied test leads will pick up induced noise. For better shielding, a short-twisted lead should be used. 4 CMM-17 Version 2.0 October 2004 QUICK START WARNING Read "SAFETY INFORMATION" before using this device. OUTPUT- Setup and output a process calibration signal 1. Set the side switch to the M/S position 2. Turn the function switch to select a function combination for the output ( or V) and input. , mA, 3. Press “SHIFT” to change the button operation to the output mode. 4. Use the arrow buttons (3/ 4for digit selection, 5/ 6 for value) to set the output value. 5. Connect the OUTPUT terminals to the device to be tested. 6. Press the OUTPUT button. The process signal will become active. 7. Press the OUTPUT button again to stop the output. Figure 1 Quick Output Operation 3. Press SHIFT to enable output function ms Level ACDC C F k Hz Remote SCAN SHIFT AUTO @OFF JK OUT TE RS SBY 88888 4-20 0-20 m µ AV sec MAX AVGMIN ACDC 88888 C 0-20 4-20 F 0C m µ AV sec Mk Ù Hz 4. Use the arrow buttons to set the output value. 2. Turn the dial to select function 6/7. Press the OUTPUT button to toggle the signal ON/OFF 1. Set switch to M/S positon 5. Output Terminals OUTPUT FUNCTIONS ARE CODED IN YELLOW INPUT FUNCTIONS ARE CODED IN WHITE 5 CMM-17 Version 2.0 October 2004 INPUT- ACV and Frequency measurements 1. Set the switch on the left side of the meter to the M or M/S position 2. Turn the rotary switch to select “V” and the output function ( as desired. 3. Press the “AC/DC” button momentarily to select AC voltage measurement. 4. Press the “Dual” button momentarily to set frequency as the secondary display measurement. 5. Connect test leads from the INPUT terminals to the device under test. , mA or V) Figure 2 Dual display of AC Voltage (ACV) and Frequency (Hz) 3. Press momentarily to select AC voltage test ms Level ACDC C F k Hz Remote SCAN SHIFT AUTO @OFF JK OUT TE RS SBY 88888 4-20 0-20 m µ AV sec MAX AVGMIN ACDC 88888 2. Turn the rotary switch to ‘V’ function C 0-20 4-20 F 0C m µ AV sec Mk Ù Hz 4. Press momentarily to set frequency measurement for the secondary display 1. Set switch to ‘M/S’ or ‘M’ 5. Connect the INPUT test leads to the source to be tested OUTPUT FUNCTIONS ARE CODED IN YELLOW INPUT FUNCTIONS ARE CODED IN WHITE 6 CMM-17 Version 2.0 October 2004 PROCESS CALIBRATOR/ METER INTRODUCTION This CMM-17 process calibrator/meter is a hand-held, battery-operated instrument ideal for testing and troubleshooting electronic systems. In addition, this device can be used for maintaining, servicing industrial meters, testing electronic circuits and electronic equipment. This meter can also be used to measure or calibrate sensors or transmitters in automotive or automatic control systems. The meter generates a high precision constant voltage, constant current and square wave output and includes a full featured, high accuracy multimeter. The precision source and the measurement functions can be used simultaneously. Main Features: • Generates and Measures signals simultaneously • 1,200Ω drive capability with special yellow lead for 20mA simulation. • High precision Constant voltage, Constant Current and Square wave outputs • Intelligent Output and Standby control • Built-in Ni-MH rechargeable battery • Smart Charger design • EL backlit display • Coarse and Fine output adjustments • % scale displays for 4-20mA or 0-20mA signals • Adjustable step and interval values for Auto Scan • Adjustable resolution and start time for linear Ramp output. • 1ms Peak Hold in-rush voltage and current capture • Temperature measurements with optional 0°C compensation • Frequency, Duty cycle and Pulse width measurements. • Dynamic Recording for MIN/MAX/AVG • Data Hold with Manual or Auto Trigger • Relative mode for offset and zero functionality • Diode and Audible Continuity tests • Bi-directional optical computer interface with SCPI commands • Safe, precise, and quick calibration • 50,000 count precision True-RMS digital multi-meter designed to meet IEC-1010 CAT. II 250V standards 7 CMM-17 Version 2.0 October 2004 GETTING STARTED LCD Display Description Figure-3 LCD Display 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. Remote control Thermocouple type Output enable/disable Secondary display for output and input Constant voltage output Square wave output for Hz Square wave output for % Square wave output for mS Output/input units Scan output Ramp output Shift button operation Diode/audible continuity Auto range Relative mode Low battery Auto power off icon Data Hold (manual trigger) Primary display for input Input units Positive/negative trigger slope for % and mS tests Without ambient temperature compensation % 4-20/4-20mA % 0-20/0-20mA Dynamic recording 8 CMM-17 Version 2.0 October 2004 Slide Switch The power selector switch (left side of meter) can be set to the following positions: Charge: this position is selected to charge batteries. Use the DC adapter to charge the meter. M: Measurement-only function, output is disabled. M/S: Both source and measure functions can be used, simultaneously. M: Provide power for Meter (INPUT) only. M/S: Provide power for Measurement and Source function. Charge: Charge batteries by using the standard DC adapter Slide Switch Charging indication GREEN: Fully charged RED: Charging External DC adaptor jack: Plug–in external DC adapter charges the batteries or provides power to the meter. Figure-4 Slide Switch 9 CMM-17 Version 2.0 October 2004 Rotary Switch Set the slide switch to the M or M/S position. Turn the meter ON and select a function combination by turning the rotary switch (Figure-5). The output and input functions are selected together. The outside (yellow) row represents the OUTPUT (SOURCE); the inside (white) row represents the INPUT (METER) function. FUNC. INPUT (White Color) 1 Power Off 2 DC, AC or DC+AC Voltage measurements. 3 4 5 6 OUTPUT (Yellow Color) Square wave output Constant current : ± 25 mA Constant voltage : ± 1.5V, ± 15V Constant voltage : ± 1.5V, ± 15V Constant voltage : ± 1.5V, ± 15V Constant current : ± 25 mA Constant voltage DC, AC or DC+AC mA measurements: 50mA and 500 mA Constant current : ± 25 mA DC, AC or DC+AC mV measurements (Temperature) Resistance/ Continuity measurements Diode/ Audible Continuity. : ± 1.5V, ± 15V Square wave output Set the slide switch to the M or M/S position. Turn the meter ON and select a function combination by turning the rotary switch. 3 4 2 5 6 1 Figure-5 Select function combinations using Rotary Switch 10 CMM-17 Version 2.0 October 2004 INPUT and OUTPUT TERMINALS WARNING To avoid damage to this device do not exceed the input limits. This device has four terminals. Two terminals are used for input functions (with overload protection) and two terminals are used for the output functions. Overload protection is 30 volts DC (refer to the table below): Table 2 Input limit specifications ROTARY SWITCH FUNCTION INPUT TERMINAL V Ω mA OVERLOAD PROTECTION + and - 250 V RMS AC/DC Voltage range: 5V~ 250V AC/DC Voltage range: 50mV~ 500mV Ohm (Ω) Diode ( ) Temperature AC/DC Current range: 50 ~500mA 250V/630mA, quick acting fuse OUTPUT terminals for Constant voltage, Constant Current and Square wave Output functions Figure-6 INPUT terminals for Voltage, Current, Resistance, Diode/ Audible Continuity measurements Output and Input Terminals 11 CMM-17 Version 2.0 October 2004 PUSH-BUTTON OPERATION Push-button operations are detailed below. When a push-button is pressed, a related display symbol will switch ON and the beeper will sound. INPUT OPERATIONS Figure-7 Control Buttons 1. AC/ DC (BLUE): Select DC, AC, DC+AC Test In Voltage mode, use this button to step through DC, AC and DC+AC. In Current mode, use this button to step through DC, % of mA, AC and DC+AC. For Voltage and current measurements, hold this button for more than 1 second to toggle 1 ms peak hold on/off. The display will show "DH MAX" to indicate PEAK + or "DH MIN" to indicate PEAK -. For Ohm tests, push this button momentarily to toggle continuity " " on/off. The continuity beeper will sound when the measurement is below 10 ohms or 1000 counts. For Duty cycle and Pulse width tests, press and hold this button for more than 1 second to change the trigger slope to or . For temperature measurements, use this button to toggle the environment compensation ON/OFF. The sign means environmental compensation has been disabled. 2. HOLD: DATA HOLD (Trigger) or Refresh Data Hold (Auto trigger) Press this button momentarily to hold (freeze) the existing displayed digital value and to enter the trigger mode. Press this button momentarily again to trigger and update the data hold display Press and hold this button for at least one second to exit the DATA HOLD mode. In "Refresh Hold" mode (selected in the setup mode), the display updates automatically when the reading changes (an audible tone sounds when an update occurs). 3. HOLD (MAX • MIN): Dynamic Recording Record maximum, minimum, and calculate true average. Press this button for at least 1 second to toggle the recording mode on/off. Use this button to cycle through MAX, MIN, AVG and present readings. The beeper sounds when a new maximum or minimum value is recorded. Use this button to cycle through Peak +, Peak - after setting the peak mode. The screen displays "DH MAX" to indicate PEAK + and "DH MIN" to indicate PEAK -. 4. REL (ZERO): Relative function The relative function displays the difference between the measured value and the stored value. Press to store the displayed value and to toggle Relative (∆) ON or OFF. Press and hold this button for at least 1 second to enter the Temperature (mV) measurement mode. Press and hold this button for at least 1 second to exit the temperature function. 12 CMM-17 Version 2.0 October 2004 5. RANGE: In auto-range mode: Press this button to select the Manual range mode (the "AUTO" display icon will switch off). In manual range mode: Press this button momentarily to step up 1 range at a time (press and hold for at least 1 second to select auto-range). In auto-range mode: "AUTO" icon is ON and the meter automatically selects the appropriate range for the measurement. If a reading is greater than the maximum available range, "OL"(overload) will be displayed. The meter will select a lower range when a reading is less than 9% of full scale. Push this button momentarily to change measuring range and re-start the PEAK+ and PEAK- measurements after setting the peak mode. 6. DUAL: Dual Display Combination Press this button momentarily to choose a display combination. For combination displays, please refer to the MULTI-DISPLAY MULTIMETER section. Push this button momentarily to re-start a new peak value measurement after setting peak mode. 7. Hz: Select Frequency, Duty Cycle and Pulse Width Tests For Voltage or Current tests, press this button momentarily to enter the Frequency test mode. Voltage or Current will be indicated in the secondary display. Press this button again to step through Frequency, Duty cycle, and Pulse width tests. Press and hold this button for at least one second to return to the voltage or current measurement mode. For available combination displays, please refer to the chapter MULTI-DISPLAY MULTIMETER. 8. : Back-light/SHIFT Press this button momentarily to shift the push-button operation. The push-buttons ) icon appears on the display. control output functions when the SHIFT ( Press and hold this button for at least 1 second to toggle the backlight ON or OFF. Backlighting turns off automatically. 13 CMM-17 Version 2.0 October 2004 OUTPUT OPERATION Figure-8 Control Buttons 1. (SHIFT): Backlit/SHIFT Press this button momentarily to shift the operation of the push buttons. All push buttons will be used to adjust OUTPUT states when is on the display. 2. MODE: Select adjustment mode For the square wave output, press this button momentarily to select which parameter is to be adjusted. Press this button to cycle through Hz, %, ms and amplitude adjustment modes. For constant voltage output, press this button momentarily to cycle through ±1.5V, ±15V, SCAN ±1.5V, SCAN±15V, RAMP±1.5V and RAMP±15V output modes. For constant current output, press this button momentarily to cycle through ±25mA, SCAN±25mA and RAMP±25mA output modes. After setting SCAN and RAMP for constant voltage and current output, press and hold this button for at least 1 second to enter the Memory generation adjustment mode. Please refer to the Memory Generation section for a detailed description. 3. 3 (LEFT): Select Digits or polarity to be adjusted For voltage and current outputs, press this button momentarily to move the adjustment position from polarity, digit 1, 2, 3, 4, 5 and back to polarity. The selected position will flash on the screen. ± ← Digit 5 ← Digit 4 ← Digit 3 ← Digit 2 ← Digit 1 ← ± After set SCAN mode for voltage and current output, press this button momentarily to select Continuous, Cycle or Step output. Normally, it is defined to continuous output. Please refer to the chapter about Memory Generation for detail description. After set RAMP mode for voltage and current output, press this button momentarily to select Continuous or Cycle output. Normally, it is defined to continuous output. Please refer to the chapter about Memory Generation for detail description. 4. 4 (RIGHT): Select which Digits or polarity to be adjusted Press this button momentarily to move the adjustment position from polarity, digit 5, 4, 3, 2, 1 then scroll up to polarity. The selected position will be flashed on the screen. ± → Digit 5 → Digit 4 → Digit 3 → Digit 2 → Digit 1 → ± 5. 5 (UP): Adjust digit or polarity Press this button momentarily to increase the selected digit by 1 count or toggle the polarity of the output. Press and hold this button to scroll quickly. 6. 6(DOWN): Adjust digit or polarity Press this button momentarily to decrease the selected digit by 1 count or toggle the polarity of the output. Press and hold this button to scroll quickly. 7. OUTPUT: Control the output state Press this button momentarily to toggle the output state ON and OFF. The icon indicates a signal is being sourced. The icon indicates the signal has been disabled (standby). For SCAN and RAMP adjustment modes, press this button momentarily to save a setting 14 CMM-17 Version 2.0 October 2004 POWER-ON OPTIONS How to enter the setup mode Press and Hold the MODE (BLUE) button while turning the rotary switch to any “ON” position. The meter will enter the setup mode. These parameters will remain in non-volatile memory. Figure-9 Power-ON Options The user can configure the related parameters in the setup mode by following these steps: 1. 2. 3. 4. Press the “ (LEFT)” or “ (RIGHT)” button to select the menu item to be set. Press the “ (UP) or (DOWN)” button to change a parameter. Press the “OUTPUT” button momentarily to save changes. Press the “SHIFT” button momentarily to exit the setup mode. 15 CMM-17 Version 2.0 October 2004 Factory Default Table-3 describes the setup menu items and indicates the default settings. Menu item Table-3 Factory Setting Setup Menu Items Selectable Parameters Baud Rate 9600 2400, 4800, 9600, 19200 Parity None Odd, even or none Data bits 8 ECHO OFF ON or OFF Print OFF ON or OFF Percentage scale 4-20mA Frequency 0.5Hz Set minimum measurement frequency, 0.5Hz, 1Hz or 2 Hz. Beep 4800 The tone frequency can be set to 4800, 2400, 1200 or 600 Hz. “OFF” means to disable beep. Temperature * n1 °C 8 bits or 7 bits (Stop bit = 1 bit) 4-20mA and 0-20mA for % scale readout Four combinations can be selected: 1. °C only 2. °C/ °F 3. °F only 4. °F/ °C OFF = Data Hold (Manual Trigger), set trigger from 100~1000 counts Refresh Hold OFF Auto power off 15 1~99 minutes; “OFF” = disables auto power off. Backlit 30 1~99 seconds; “0FF” = disables auto power off for backlight Notes: The temperature menu can be selected once the “ ” icon is lit on the display. Press and hold the “SHIFT” button for at least one second to enable the temperature option, “SHIFT” will appear on the display. 16 CMM-17 Version 2.0 October 2004 Baud Rate The baud rate can be set to 2400, 4800, 9600 or 19200. Figure-10 Baud rate setup for remote control 17 CMM-17 Version 2.0 October 2004 Parity Check The parity check can be set to none, even or odd. To select the parity: Figure-11 Parity Check setup for remote control Data Bits The data bits can be set to 8 or 7 bits. The stop bit is fixed (1 bit) and can not be changed. Select the data bit as follows: Figure-12 Data bit setup for remote control 18 CMM-17 Version 2.0 October 2004 Echo With ECHO ON, the meter echoes (returns) all the characters it receives. Enable the Echo as follows: Figure-13 ECHO Setup Print only In the Print-only mode, the meter will print the measured data when the measuring cycle is completed. The meter automatically sends the newest data to a PC continuously. The meter does not accept any commands from the PC with Print-Only enabled. The meter’s remote indicator flashes during operation when Print-only is ON. To enable print-only: Figure-14 Print-only Setup 19 CMM-17 Version 2.0 October 2004 Percentage (%) scale for 4-20mA or 0-20mA measurements In this mode, the DC current measurements are displayed using the % scale. 4-20mA or 0-20mA measurements are displayed as 0%~100%. For example, a 25% scale display represents 8mA for a 4-20mA signal, and 5mA for a 0-20mA signal. Set the % scale as follows: Figure-15 % scale Setup for mA measurements Minimum Frequency measuring The minimum measurement frequency influences the measurement rate for frequency, duty cycle, and pulse width measurement. Normally, the measurement rate defined in the specification chart is based on the minimum frequency of 1 Hz. Figure-16 Minimum Frequency Setup 20 CMM-17 Version 2.0 October 2004 Audible Tone Frequency The audible tone frequency can be set to 4800, 2400, 1200 or 600 Hz. The beeper can also be turned OFF for silent operation. Figure-17 Beeper tone frequency 21 CMM-17 Version 2.0 October 2004 Temperature Units 1. 2. 3. 4. Celsius only (°C on primary display only) Celsius/ Fahrenheit (°C/ °F), the primary and secondary display can be switched to indicate Fahrenheit/ Celsius (°C/ °F). Fahrenheit only (°F on primary display only) Fahrenheit/ Celsius (°F/ °C), the primary and secondary display can be switched to indicate Celsius/ Fahrenheit (°F/ °C) Press and hold SHIFT for at least one second to open the temperature scale menu Figure-18 Temperature Unit Setup 22 CMM-17 Version 2.0 October 2004 Data Hold/Refresh Hold The factory default setting for the Data Hold mode is MANUAL Trigger by key-press/ BUS Trigger by remote control. Set to “OFF” for Data Hold (Manual Trigger), and set from 100~1000 to enable Refresh Hold. When the measured value exceeds the setting (100~1000) the refresh hold will trigger. Enable Refresh Hold as follows: Figure-19 Data Hold/ Refresh Hold Setup 23 CMM-17 Version 2.0 October 2004 Auto Power Off The timer for auto power off can be set from 1~99 minutes, “OFF” disables auto power off. Set the auto power off timer as follows: Figure-20 Auto power off setup The Auto power off feature was designed conserve battery energy. The instrument will automatically turn off at the programmed time unless one of the following actions occurs: • A key is pressed • The measurement function is changed • The meter is set to datalog • 1 ms peak hold is set • Auto power off has been disabled • The output has been enabled (the is displayed) The rotary switch must be set to the OFF position and then to an active position again to activate the meter after an auto power off action. When the meter is to be used for long periods of time, the operator may wish to disable the auto power off feature. The " icon will switch off when the auto power off function is disabled. 24 " CMM-17 Version 2.0 October 2004 Backlit Display The backlight timer can be set from 1~99 seconds, a setting of “0FF” indicates that the backlight is disabled. The backlight automatically turns off after the programmed time. Set the time as follows: Figure- 21 Backlit Timer Setup SCAN and RAMP Output Functions For constant voltage and current outputs, this device employs two automatic and programmable output functions. The SCAN output mode offers 16 steps where each step can be programmed for amplitude and time interval. The RAMP output offers dual slopes for linear output simulation with an adjustable resolution. Refer to the information provided below for more detailed instructions on SCAN and RAMP output features: AUTO SCAN OUTPUT 1. 2. 3. 4. 5. 6. Selecting the scan function Turn the rotary switch to the mA or V output position. Press SHIFT button momentarily to shift the operation of the push buttons. Ensure that the icon is on the display. For voltage outputs, press the MODE button momentarily to cycle through ±1.5V, ±15V, SCAN±1.5V, SCAN±15V, RAMP±1.5 V and RAMP±15V output modes. For current outputs, press the MODE button momentarily to cycle through ±25mA, SCAN ±25mA and RAMP ±25mA output modes. After setting the scan function, the icon will switch on. 25 CMM-17 Version 2.0 October 2004 Table of initial memory settings: Mode ±1.5000 V Step Amplitude 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 +1.5000 V +1.2000 V +0.9000 V +0.6000 V +0.3000 V +0.0000 V -0.3000 V -0.6000 V -0.9000 V -1.2000 V -1.5000 V +0.0000 V +0.0000 V +0.0000 V -1.5000 V +0.0000 V Time interval 02 sec 02 sec 02 sec 02 sec 02 sec 02 sec 02 sec 02 sec 02 sec 02 sec 02 sec 00 sec 00 sec 00 sec 00 sec 00 sec ±15.000 V Amplitude Time interval +15.000 V 02 sec +12.000 V 02 sec +09.000 V 02 sec +06.000 V 02 sec +03.000 V 02 sec +00.000 V 02 sec -03.000 V 02 sec -06.000 V 02 sec -09.000 V 02 sec -12.000 V 02 sec -15.000 V 02 sec +00.000 V 00 sec +00.000 V 00 sec +00.000 V 00 sec -15.000 V 00 sec +00.000 V 00 sec ±25.000 mA Amplitude Time interval +00.000 mA 02 sec +04.000 mA 02 sec +08.000 mA 02 sec +12.000 mA 02 sec +16.000 mA 02 sec +20.000 mA 02 sec +16.000 mA 02 sec +12.000 mA 02 sec +08.000 mA 02 sec +04.000 mA 02 sec +00.000 mA 02 sec +04.000 mA 00 sec +08.000 mA 00 sec +12.000 mA 00 sec +16.000 mA 00 sec +20.000 mA 00 sec Automatic SCAN output After selecting the function, press the “3” or “4” button momentarily to scroll through the three SCAN modes: Continuous, Cycle or Step output. The secondary display will show Cont, CYCLE, or StEP respectively. In the Continuous and Cycle output modes always start from step 1. Note that if the time interval for step1 is set to 00 seconds, the step 1 amplitude will only output when the output function is activated. If you stop the output when in the continuous or cycle mode, the output will return to step 1. 1. Cont: (Continuous output). Press the “OUTPUT” button to start. The meter output signal will follow the programmed steps, starting from step 1, until the time interval of a memory step is “00” seconds. At that point, the memory will return to the step 1 output. The amplitude of each step will remain on for the programmed time interval of each step. 2. CYCLE: (One cycle output). Press the “OUTPUT” button to start. The meter output signal will follow the programmed steps, starting from step 1 and then will lock on the last output step (preceding the step with a programmed time interval of “00” seconds). 3. STEP: (Step output). In this mode the user manually selects each step in the program. Use the “5” or “6” button to select each step. The amplitude of the selected step will remain on until a new step is selected. Amplitude 26 CMM-17 Version 2.0 October 2004 Figure-22 Selecting SCAN Output Manner Figure-23 SCAN OUTPUT Programming the SCAN output steps Press and hold the “MODE” button for at least 1 second to enter the SCAN adjustment mode. There are 16 steps available and each can be programmed for time interval and output amplitude. The secondary display shows the amplitude. The left two digits of the primary display are used to indicate the step number. The last two digits of the primary display are used to indicate time interval. Use the “MODE” button to cycle through the step, time interval and amplitude adjustment fields. The screen will flash the digit that is to be adjusted. Normally, the step 1 adjustment will appear when the mode is entered. The time interval can be set from 0 to 99 seconds using the “5” or “6” buttons. Press the “OUTPUT” button momentarily to save the setting. Press and hold the “4” button for at least 1 second to set the time and amplitude to zero. Figure-24 Memory Adjustment for SCAN Output 27 CMM-17 Version 2.0 October 2004 AUTO RAMP OUTPUT 1. Selecting the RAMP function • Turn the rotary switch to the mA or V output position. • Press “SHIFT” momentarily to shift the operation of the push buttons. Ensure • • that the display icon appears on the display. For voltage outputs, press “MODE” momentarily to cycle through ±1.5V, ±15V, SCAN±1.5 V, SCAN ±15V, RAMP ±1.5 V and RAMP±15V output modes. For current outputs, press “MODE” momentarily to cycle through ±25mA, SCAN ±25mA and RAMP±25mA output modes. After setting the RAMP function, the display icon will switch on. 2. Table of default memory settings: Mode Position Start End 3. Amplitude -1.5000 V +1.5000 V ± 1.5000 V Resolution 015 steps 015 steps ± 15.000 V ± 25.000mA Amplitude Resolution Ampl. Res. -15.000 V 015 steps -25.000mA 025 steps +15.000 V 015 steps +25.000mA 025 steps Automatic RAMP output After selecting the RAMP function, use the “3” or “4” button to select Continuous or Cycle output. The secondary display will show Cont and CYCLE, respectively. • Cont: Continuous output. Press the “OUTPUT” button to start. The meter’s output signal will follow the programmed steps (0.33 seconds per step). For example, in the default settings Table above, the first slope interval = (end amplitude - start amplitude) divided by the resolution. Therefore, the interval is (1.5V+1.5V)/15steps= 0.2 V for ± 1.5000 V. The interval of the secondary slope is (start amplitude - end amplitude) divided by the resolution. • Therefore, the interval is (-1.5V-1.5V)/15steps= -0.2 V for ± 1.5000 V. CYCLE: (One cycle output). Press the “OUTPUT” button to start. The meter’s output signal will follow the programmed steps (0.33 seconds per step approx.) and then will lock on the last output step. Figure-25 Selecting RAMP Output 4. Setting the RAMP parameters Press and hold “MODE” for at least 1 second to enter the RAMP adjustment mode. The RAMP is a dual slope output, meaning that the user can adjust the resolution between start and end positions or end and start positions, and also the amplitude of start or end positions. 28 CMM-17 Version 2.0 October 2004 Each interval = (End amplitude Start amplitude) / resolution Each interval = (Start amplitude End amplitude) / resolution End Position Start Position Figure-26 RAMP OUTPUT The secondary display shows the amplitude for the Start or End position. The left-most digit of the primary display indicates Start or End positions. The last three digits of the primary display are used to indicate interval. Push the “MODE” button momentarily to cycle through position, interval and amplitude adjustment. The screen will flash the digit to be adjusted. The resolution can be set from 1 to 999 by pressing the “5” or “6” buttons. Press the “OUTPUT” button momentarily to save a setting. Figure-27 RAMP Output Programming 29 CMM-17 Version 2.0 October 2004 SQUARE WAVE OUTPUT The Square wave output can be used to check and calibrate flow-meter display meters, counters, tachometers, oscilloscopes, frequency converters, frequency transmitters and other frequency input devices. The Square wave output has four parameters: frequency, amplitude, duty cycle, and pulse width. Select the square wave output function. • • • • Turn the rotary switch to the output position. Press “SHIFT” momentarily to shift the operation of the push buttons. Ensure that the display icon appears on the display. The default settings are 150 Hz, 50.00 %, 3.3333ms and + 5V for frequency, duty cycle pulse width and amplitude, respectively. See Figure-28. Press “OUTPUT” momentarily to send out the signal. Twenty-eight (28) frequencies can be selected: Frequency 0.5, 1, 2, 5, 10, 15, 20, 25, 30, 40, 50, 60, 75, 80, 100, 120, 150, 200, 240, 300, 400, 480, 600, 800, 1200, 1600, 2400, 4800 Hz To select the square wave output frequency: • Press “SHIFT” momentarily to shift the operation of the push buttons. The display icon will switch on. • • • Press “MODE” momentarily to select the frequency adjustment. The icon will switch on. Select the frequency using the “5” or ” 6” button. Press “OUTPUT” to send out the signal. display The duty cycle can be adjusted in 256 steps. Each step is 0.390625 % (the screen display resolution is 0.01 %). To adjust the duty cycle: • • Press “MODE” momentarily to select the duty cycle adjustment. The will switch on. Use the “5” & ” 6” buttons to adjust the duty cycle. icon The Pulse width can be adjusted in 256 steps. Each step is 1/ (256*frequency) and depends on the frequency. • • Press “MODE” momentarily to select the pulse width adjustment. The will switch on. Use the “5” & ” 6” buttons to adjust the pulse width. sign Select the amplitude (+ 5V, ± 5V, + 12V and ± 12V) To select the square wave output. • Press “MODE” momentarily to select the amplitude adjustment. The Level icon will switch on. • Use the “5” & ” 6” buttons to select the amplitude. 30 CMM-17 Version 2.0 October 2004 Figure-28 Parameters selection for Square Wave output 31 CMM-17 Version 2.0 October 2004 Output Standby Modes and Overload Alerts WARNING Select the proper rotary switch function before connecting the test leads to a current loop or simulation points. OUTPUT/ STANDBY MODES The meter will automatically switch from the OUTPUT mode to the STANDBY mode when one of the following conditions exists: 1. Input signal is connected to the output terminals while the meter is trying to output a signal. 2. Excessive noise on the output terminals from an external power system or other source. 3. An overload condition has been detected during constant voltage or square wave outputs. 4. Weak battery or low battery condition. Note: When the OUTPUT function is not to be used, set the slide switch to "M" (input only) position to save battery power. OVERLOAD ALERT FOR VOLTAGE MEASUREMENT WARNING In case of an overload alert, remove the test leads from the measuring source. This meter includes an overload alert for voltage measurements. The audible tone periodically beeps once the measurement voltage limit is exceeded (251.00V). For safety, please be aware of this alert. 32 CMM-17 Version 2.0 October 2004 ADVANCED FEATURES Dynamic Recording Data Hold (Manual Trigger) Refresh Hold (Auto Trigger) Relative (Zero) 1 ms Peak Hold DYNAMIC RECORDING The dynamic recording mode can be used to capture POWER ON and POWER off surges, verify performance of power systems, automatically datalog in the field, and datalog in the laboratory. The average reading feature is useful for smoothing out unstable or changing inputs, estimating the percentage of time a circuit is operated, or for verifying circuit performance. The operational procedures are described below: 1. Press "MAX • MIN" for at least 1 second to enter the dynamic recording continuous mode (non data hold). The present value is stored in the maximum, minimum and average memories (the MAX AVG MIN display icons will switch ON). 2. Press and hold the button for at least 1 second to exit the recording mode. 3. Press the button momentarily to cycle through maximum, minimum, average and present readings. The MAX, MIN, AVG or MAX AVG MIN sign will switch on respectively to indicate which value is being displayed. See Figure-29. 4. The beeper sounds when a new maximum or minimum value is recorded. 5. If an overload is recorded the averaging function will stop. The average value becomes " OL "(overload). 6. 7. 8. 9. In dynamic recording mode, the auto power off feature is disabled, and the " " icon will switch off. Selecting dynamic recording in the auto range mode will allow the meter to record the MAX, MIN or AVG values for various ranges The recording speed of dynamic recording in manual range is about 0.067 seconds (approx.) The average value is the true average of all measured values taken since the recording mode was entered Figure-29 Display of Dynamic Recording 33 CMM-17 Version 2.0 October 2004 DATA HOLD (Manual Trigger) The data hold function allows operators to hold the displayed digital value. Press HOLD to freeze the displayed value and enter the manual trigger mode ("DH" will be displayed). Press the button again to trigger a new measurement thereby updating the display. The “DH” flashes before each new update. Press HOLD for at least one second to exit this mode. Figure-30 Data Hold Operation REFRESH HOLD (Auto Trigger) Refresh Hold automatically engages the DATA HOLD function when the present measurement value varies from the previous measurement value by a programmable amount; it also sounds a tone to alert the user that a new reading is being held. Press “HOLD” to enter the Refresh Hold mode. The present value will be held and the ”DH” icon will switch on. The meter will update the display with a new value only if a measurement is made that varies from the present measurement by a programmed amount; the “DH” icon will flash and an audible tone will sound when the display is updated with a new held reading. For voltage and current measurements, the held value will not be updated if the reading is below 500 counts. For resistance and diode measurements, the held value will not be updated if the reading is “OL” or in an open state. 34 CMM-17 Version 2.0 October 2004 RELATIVE (ZERO) MODE The relative function subtracts a stored value from the present measurement and displays the result. 1. 2. 3. 4. 5. Press REL button momentarily to set the relative mode. This sets the display to zero and stores the displayed reading as a reference value, (the " ∆ " display icon will switch on). The relative mode can be used in the auto or the manual range mode, but can't be set when an overload has occurred. Press REL again to exit the relative mode. When the Ohm measurement mode is entered, the display will read a non-zero value due to the presence of test leads resistance. You can use the relative function to Zero-Adjust the display and null the test lead resistance. For DC voltage measurements, the thermal effect will influence the accuracy. Use the relative function to zero the thermal effect. Short the test leads and press REL button momentarily. Figure-31 Relative (Zero) Operation 35 CMM-17 Version 2.0 October 2004 1 ms Peak Hold This Meter can be used to analyze components such as power distribution transformers and power factor correction capacitors. Additional features allow the measurement of half-cycle peak voltage by using the 1 ms peak hold feature allowing the determination of the crest factor: Crest factor = Peak value/True RMS value 1. 2. 3. 4. Press the BLUE button for at least 1 second to toggle 1 ms peak hold mode ON/OFF. Press DH (MAX• MIN) button momentarily to show peak + or peak - value after setting the peak mode. The display shows "DH MAX" to indicate the PEAK + and shows "DH MIN" to indicate the PEAK -. See Figure-32. If the reading is " OL", then push the RANGE button momentarily to change the measuring range and re-start the PEAK measurement after setting the peak mode. Press the DUAL button momentarily to re-start the 1 ms peak hold. Figure-32 1 ms Peak Hold Display 36 CMM-17 Version 2.0 October 2004 PC REMOTE COMMUNICATION This instrument has bi-directional (full duplex) communication functionality. This feature allows the user to record and save data easily. The protocol format uses SCPI commands (Standard Commands for Programmable Instruments). All commands are ASCII characters (non-hexadecimal). The SCPI protocol is contained in the CMM-17 Protocol Manual on the supplied the CD-ROM. Please refer to the following procedures for PC interface communication: 1. 2. 3. 4. 5. Setup the communication parameters for the meter and the personal computer. The meter’s factory default settings are: 9600, n, 8, 1. Be sure that the USB driver has been installed on your computer. Connect the optical side of the cable to the communication port of the meter (text side of connector face up as shown in Figure-33. The carrying case can be used as a stand as shown below in Figure-33. Plug the USB end of the cable into the USB port of the personal computer. See the Figure-33. Figure-33 Cable Connection for Communication 37 CMM-17 Version 2.0 October 2004 DUAL-DISPLAY MULTIMETER The frequency measurement capability of this meter helps detect the presence of harmonic currents in neutral conductors and determines whether these neutral currents are the result of unbalanced phases or non-linear loads. Selection by Hz Button For Voltage or Current tests, press the Hz button momentarily to enter the Frequency measurement mode. Voltage or Current will be displayed on the secondary display, the frequency will display on the primary display. Press this button again to step through Frequency, Duty cycle and pulse width tests. This allows simultaneous monitoring of the present levels and frequency (or Duty Cycle, or pulse width). Press and hold the Hz button for at least1 second to return to Voltage or Current measurement mode. Function AC Voltage DC Voltage AC+DC Voltage AC Current DC Current AC+DC Current %(0-20 or 4-20) Primary display Secondary display Frequency (Hz) ACV Duty Cycle (%) ACV Pulse Width (ms) ACV Frequency (Hz) DCV Duty Cycle (%) DCV Pulse Width (ms) DCV Frequency (Hz) AC+DC V Duty Cycle (%) AC+DC V Pulse Width (ms) AC+DC V Frequency (Hz) ACA Duty Cycle (%) ACA Pulse Width (ms) ACA Frequency (Hz) DCA Duty Cycle (%) DCA Pulse Width (ms) DCA Frequency (Hz) AC+DC A Duty Cycle (%) AC+DC A Pulse Width (ms) AC+DC A Frequency (Hz) %(0-20 or 4-20) Duty Cycle (%) %(0-20 or 4-20) Pulse Width (ms) %(0-20 or 4-20) 38 CMM-17 Version 2.0 October 2004 AC VOLTAGE MEASUREMENT Figure-34 Combination display for AC Voltage Measurements 39 CMM-17 Version 2.0 October 2004 AC+DC VOLTAGE MEASUREMENT Figure-35 Combination display For AC+DC Voltage Measuring 40 CMM-17 Version 2.0 October 2004 DUAL button Another method for accessing combination displays is by pressing the DUAL button. The available dual displays are listed in the following table. Function AC Voltage DC Voltage AC + DC Voltage DC Current AC Current AC+DC Current %(0-20 or 4-20) Temperature Primary display ACV DCV AC+DC V DCA ACA AC+DC A %(0-20 or 4-20) Celsius (°C) Fahrenheit (°F) Secondary display Hz (AC coupling) Hz (DC coupling) Hz (AC coupling) Hz (DC coupling) Hz (AC coupling) Hz (AC coupling) Hz (DC coupling) Fahrenheit (°F) Celsius (°C) Voltage Measurement Figure-36 Using the DUAL & BLUE buttons for voltage measurements 41 CMM-17 Version 2.0 October 2004 CURRENT MEASUREMENTS 1. Press AC/DC momentarily to step through AC, DC+AC and DC tests. Key operation Primary display Secondary display Press AC/DC AC mA Press AC/DC AC+DC mA Press AC/DC DC mA Press AC/DC % for 4-20 or 0-20 mA 2. Press DUAL momentarily to enter the multi-display mode. Key Primary display Sec. operation display Push Dual DC mA (AC, AC+DC, % for 4-20 or 0-20mA) Hz Push Dual DC mA (AC, AC+DC, % for 4-20 or 0-20mA) Figure-37 Using DUAL & BLUE buttons for Current Measurements 42 CMM-17 Version 2.0 October 2004 Temperature Measurement CAUTION Do not bend the thermocouple leads sharply. Repeated bending can damage the leads The bead type thermocouple probe is suitable for making temperature measurements from -40°C (°F) to 204°C (399°F). Do not exceed these limits. Do not immerse the thermocouple in liquids. For best results, use a thermocouple probe designed for each application (i.e. an immersion probe for liquid or gel, an air probe for air measurements, etc.). Follow the measurement techniques as below: 1. 2. 3. 4. 5. 6. Turn the slider switch to the “M” position to disable all output functions. Turn the rotary switch to the " mV " range. Press and hold the “REL” button for at least 1 second for temperature measurements. Plug the adapter with thermocouple probe into the "+” and "-" input terminals. Touch the thermocouple to the surface being measured. Read the display. Figure-38 Surface temperature measurement OFF OUTPUT 43 INPUT CMM-17 Version 2.0 October 2004 SPECIFICATIONS GENERAL SPECIFICATIONS Display: • The primary and secondary displays are 5-digit LCD displays with maximum reading of 51000 counts. • Automatic polarity indication. Functions: • DCV, ACV, DCA, ACA, OHM, Diode check, Audible continuity, Temperature, Frequency, Duty cycle and Pulse Width tests. • AC+DC true RMS measurement for both voltage and current. • 1-ms peak hold for capturing glitches. • % scale readout for 4-20mA and 0-20mA measurement • High precision constant current and constant voltage outputs (Bipolar sink-source system). • Memory: Up to 16 user-programmable locations for each range. • Scan Output feature: One cycle or continuous cycling process outputs • Ramp Output for linear process outputs • Square wave output with adjustable duty cycle, pulse width and amplitude. • EL Backlit display • Min/Max/Average, Data Hold with Manual or Auto Trigger and Relative modes • Bi-directional optical PC interface with SCPI commands Measuring rate (Approx.): • 3 times per second • 1 time per second for frequency or duty cycle measurement. (>1Hz) • 0.25 ~4 times per second for Pulse Width measurements. (>1Hz) Low battery indicator: The " " appears when the battery voltage drops below 8V (approx.). Operating temperature: 32 to 122°F (0°C to 40 °C). Storage temperature: -4 to 140°F (-20°C to 60°C) w/ BATTERY REMOVED Relative Humidity (R.H.): maximum 80% R.H. for temperature up to 31°C decreasing linearly to 50% R.H. at 40°C Temperature coefficient INPUT: 0.15 * (specified accuracy) / °C (from 0°C to 18°C or 28°C to 40°C) OUTPUT: ± (50ppm rdg + 0.5dgt)/ °C Common Mode Rejection Ratio (CMRR): >90 dB at DC, 50/60 Hz ±0.1% (1kΩ unbalanced) Normal Mode Rejection Ratio (NMRR): > 60 dB at 50/60 Hz±0.1% Power supply: 1. Rechargeable batteries 1.2V x 8 pieces (Ni-MH) (no cadmium, lead or mercury added). 2. The external switching adapter, AC100~250V/47~63Hz input and DC14 Volts/1A output. Power Consumption: 5.0VA maximum 3.5VA typical (DC CC: 25mA, maximum load) 0.6VA typical (Meter only) Battery life: 20 hours for meter only, 5 hours for meter/source. (The new Ni-MH 1300mA batteries have been fully charged.) 44 CMM-17 Version 2.0 October 2004 Charging time: 12 hours approx. at 50 to 86°F (10°C to 30 °C). If the battery has been fully discharged, a longer charging time may be experienced Dimension: 2.1 (H) x 3.5 (W) x 7.5 (L)” [54 (H) x 90 (W) x 192 (L) mm] Weight: 26 oz. (730 g) meter only; 60 oz. (1710 g) with standard accessories Safety: Designed in compliance with EN61010-1 (IEC1010-1) for CAT-II 250V, Pollution Degree II Environment. EMC designed in compliance with EN61326-1. 45 CMM-17 Version 2.0 October 2004 INPUT SPECIFICATIONS Accuracy is given as ±(% of reading + counts of least significant digit) at 23°C ± 5°C, with relative humidity Less than 80% R.H., and warm-up for 3 minutes. DC mV/ VOLTAGE Range Resolution Overload Protection Accuracy 50mV 1µV 0.05% +50* 500mV 250V 10µV 5V 0.1mV RMS 0.03% +5 50V 1mV 250V 10mV • Input Impedance: 10MΩ (nominal) from 5V range, 1 GΩ (nominal) for 50/500 mV. • *The accuracy could be 0.05%+5, always use relative function to zero thermal effect (short test leads) before measuring the signal. AC mV/ VOLTAGE (TRUE RMS: From 5% to 100% of range) Accuracy Overload Range Resolution Protection 45Hz ~5k Hz 5kHz~20kHz 50mV 1µV 0.7%+40 1.5%+40 500mV 250V 10µV 5V 0.1mV RMS 50V 1mV 0.7%+20 1.5%+20 250V 10mV • Input Impedance: 1.1MΩ in parallel with <100pF(nominal) from 5V range, and 1 GΩ (nominal) for 50/500 mV. • Crest factor<=3 AC+DC mV/ VOLTAGE (TRUE RMS: From 5% to 100% of range) Accuracy Overload Range Resolution 45Hz ~5kHz 5kHz~20kHz Protection 50mV 1µV 0.8%+70 1.6%+70 500mV 250V 10µV 5V 0.1mV RMS 50V 1mV 0.8%+25 1.6%+25 250V 10mV • Input Impedance: 1.1MΩ in parallel with <100pF (nominal) from 5V range, and 1 GΩ (nominal) for 50/500 mV. • Crest factor <=3 46 CMM-17 Version 2.0 October 2004 1 ms PEAK HOLD (Capturing changes >1 ms in duration) Function DC mV / DC Voltage DC Current Accuracy 2%+400 digits for all ranges DC CURRENT Burden Voltage / Shunt 0.06 V (1Ω) 0.6 V (1Ω) Overload Protection 250V, 630mA Quick acting fuse AC CURRENT (TRUE RMS: From 5% to 100% of range) Range Resolution Accuracy Burden Voltage 45Hz ~ 2kHz / Shunt 50 mA 1µA 0.06 V (1Ω) 0.6% +20 500 mA 10µA 0.6 V (1Ω) • Crest factor<=3 Overload Protection 250V, 630mA Quick acting fuse Range Resolution Accuracy 50mA * 1µA 0.03% +5 500mA* 10µA 0.03% +5 Note: * Always use the relative function to zero the thermal effect with open test leads before measuring the signal. If the Relative function is not used, the accuracy will be 0.03%+25 AC+DC CURRENT (TRUE RMS: From 5% to 100% of range.) Range Resolution Accuracy Burden Voltage Overload 45Hz ~ 2kHz / Shunt Protection 50 mA 250V, 630mA 1µA 0.06 V (1Ω) 0.7% +25 500 mA Quick acting fuse 10µA 0.6 V (1Ω) • Crest factor<=3 47 CMM-17 Version 2.0 October 2004 RESISTANCE Range • • • • Resolution Accuracy 0.45mA 500Ω * 0.01 Ω 0.15% +8 0.45mA 5kΩ * 0.1 Ω 250V 50kΩ 1Ω 0.15% +5 45µA RMS 500kΩ 10 Ω 4.5µA 450nA 5MΩ 0.1 kΩ 45nA 50MΩ** 1 kΩ 1% +8 Maximum open voltage: < +4.8V Continuity: Built-in buzzer sounds when resistance is less than 10.00Ω * The accuracy for the 500Ω and 5kΩ range is specified after the Relative function is employed, which is used to subtract the test lead resistance and the thermal effects from the readings. ** For the range of 50MΩ, the RH is specified for < 60%. DIODE CHECK / AUDIBLE CONTINUITY TEST Range Resolution Accuracy Test Current Diode 0.1 mV Approx. 0.45mA 0.05% +5 • • Overload Protection Test current Open Voltage <+4.8V DC Overload protection: 250V RMS Built-in buzzer sounds when reading is below 50mV approx K - TYPE TEMPERATURE TEST RANGE Resolution Accuracy Overload Protection -40°C ~ 0.1°C 250V RMS 0.3% +3°C 1372°C -40°F ~ 0.1°F 0.3% +6°F 2502°F • The accuracy is defined for meter operation only and excludes the tolerance of the thermocouple probe. 48 CMM-17 Version 2.0 October 2004 FREQUENCY Range Resolution Accuracy 100Hz 0.001 Hz 1kHz 0.01Hz 10kHz 0.1Hz 0.02%+3 100kHz 1 Hz 200kHz 10Hz • Overload protection: 250V RMS Min. Input Freq. 1Hz Sensitivity for Voltage Measurement FREQUENCY SENSITIVITY AND TRIGGER LEVEL INPUT RANGE MINIMUM SENSITIVITY Trigger Level for DC coupling (RMS SINEWAVE) (Maximum input for specified accuracy 1 Hz-100 kHz >100 kHz < 20 kHz 20 kHz ~ 200 kHz = 10 x Range or 250V) 50 mV 15mV 25mV 20mV 30mV 500 mV 35mV 50mV 60mV 80 mV 5V 0.3V 0.5V 0.6V 0.8V 50V 3V 5V 6V 8V 250V 30V NO SPEC. 60V NO SPEC. The accuracy for duty cycle and pulse width is based on a 5V square wave input in the DC 5V range. DUTY CYCLE: Range: 0.1% to 99.9 % for DC coupling, 5% to 95% for AC coupling Accuracy: Within (0.3% per kHz + 0.3%) of full scale PULSE WIDTH: Range: 0.1 ms to 1999 ms Accuracy: 0.2%+3 Pulse width must be greater than 10µs; its range is determined by the frequency of the signal. • For Maximum V-Hz input and input Impedance specifications please refer to the AC Voltage measurement section and the specifications chart. Sensitivity for Current Measurement Minimum Sensitivity (RMS Sine-wave) Input Range 30Hz~20kHz 50mA 2.5mA 500mA 25mA • Maximum input, please refer to AC Current measurement section 49 CMM-17 Version 2.0 October 2004 OUTPUT SPECIFICATIONS Accuracy is given as ± (% of output + counts of least significant digit) at 23°C ± 5°C, with relative humidity Less than 80% R.H. CONSTANT VOLTAGE (CV) Range Resolution Accuracy 0.1 mV ± 1.5000V 0.03% +3 1 mV ±15.000V NOTE: 1. *Loading coefficient: 0.012mV/ mA for 1.5V output. 2. Maximum protection input voltage: 30 V DC Minimum * Output Current 25mA or above CONSTANT CURRENT (CC) Range Resolution Accuracy Minimum * Output Voltage 12V or above ± 25.000 mA 1 µA 0.03%+5 NOTE: 1. *Loading coefficient: 1µA/ V, the minimum output voltage is based on 20mA into 600Ω. 2. Maximum protection input voltage: 30 V DC 3. If the loop has 24V power at 20 mA use the special 1200Ω yellow lead. SQUARE WAVE OUTPUT OUTPUT Range Frequency 0.5, 1, 2, 5, 10, 15, 20, 25, 30, 40, 50, 60, 75, 80, 100, 120, 150, 200, 240, 300, 400, 480, 600, 800, 1200, 1600, 2400, 4800 Hz Duty cycle* 0.39% ~ 99.60 % Pulse width* 1 / Frequency Resolution 0.01Hz Accuracy 0.005 % +1 0.390625% 0.01 % +0.2% 0.01 % +0.3ms 2 % + 0.2V Range/256 Amplitude 0.1V 5V, ± 5V, 12V, ± 12V NOTES: 1. The pulse width must be greater than ± 50 µs or the accuracy specification may increase 2. Input protection: 30 V DC 50 CMM-17 Version 2.0 October 2004 MAINTENANCE WARNING To avoid electrical shock, do not perform any service unless you are qualified to do so. SERVICE If the instrument fails to operate, check the batteries and the test leads and replace them if necessary. If the instrument still fails to operate, double check the operating procedure described in this instruction manual. When servicing, use specified replacement parts only. The following table identifies basic problems: Malfunction To check No LCD indication when Check that the slider switch is set to the M or M/S position. power is turned on. Check battery and charge if necessary. No beeper tone Check the setup mode. The beeper may be set to OFF. Select a frequency in the setup mode. Failed on current measurement Check Fuse 1 No output signal. Press OUTPUT button, OUT displays briefly and then reverts to SBY. The OUT icon appears but there’s no output. Low battery. Check that the slider switch is set to M/S. Check that the external Load is within spec. For 24V loops use special yellow test lead for mA simulation. Check Fuse 2. No charging indication Set the slider switch to the Charge position. Check that the external adaptor is DC 14V and plugged into the DC jack completely. Line power voltage (100V~250V AC 47Hz~ 63Hz) and power cord Failed on Remote control The optical side of the cable connects to the meter (text side of connector faces up). Check the baud rate, parity, Data bit, Stop bit (default is 9600, n, 8, 1) Check that the driver is installed for USB-RS232 51 CMM-17 Version 2.0 October 2004 BATTERY CHARGING WARNING Never discharge battery or short a battery. Never mix different types of batteries or reverse polarity. Always check the battery type before charging the battery. ” sign is The meter is powered by 4 sets of rechargeable batteries. When the “ displayed and flashing, the batteries need charging. To charge the battery: 1. 2. 3. 4. 5. Turn the meter off and disconnect the test leads from external equipment. Plug the DC adapter into the jack at left side. Turn slide switch to the charge position. The RED lamp indicates the battery is charging. Remove the DC adapter or turn the slide switch to “M” position when the GREEN lamp is indicated, the battery has been fully charged. Plug in external DC adapter Turn slide switch to the charge position Charging indication GREEN: Fully charged RED: Charging Figure-62 Charge Battery 52 CMM-17 Version 2.0 October 2004 BATTERY REPLACEMENT WARNING CONTAINS NICKEL-METAL HYDRIDE BATTERY, MUST BE RECYCLED OR DISPOSED OF PROPERLY. Remove all test leads and external adaptor before opening the case. 1. 2. Loosen screw on the cover of battery compartment. Slide the cover to the left, then pull up and remove the cover. 1. Loosen the screw 2. Slide the cover to left 3. Replace all the battery sets as necessary. Figure-63 Battery replacement 53 CMM-17 Version 2.0 October 2004 FUSE REPLACEMENT Use the following procedures to replace the fuses: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Use the rotary switch to turn the meter off. Disconnect the test leads from external equipment. Be sure the adaptor has been removed. Remove the battery compartment cover and remove the batteries. Loosen the 3 screws on the bottom of the housing and remove the cover. Lift the circuit board as shown in Figure 64. Remove the defective fuse by gently prying one end of the fuse loose and sliding the fuse out of the fuse bracket. Install a new fuse of the same size and rating. Make sure the new fuse is centered in the fuse holder. Ensure that the rotary switch and the circuit board switch remain in the OFF position. Fasten the circuit board and the bottom cover respectively. Refer to the fuse specifications below: POSITION Fuse1 Fuse2 RATING 630mA/ 250V 63mA/ 250V SIZE 5x20 mm 5x20 mm Type Quick acting Time-lag acting Figure-64 Fuse replacement 54 CMM-17 Version 2.0 October 2004 CLEANING WARNING To avoid electrical shock or damage to the meter, do not allow water inside the case. To clean the instrument, use a soft cloth dampened in a solution of mild detergent and water. Do not spray cleaner directly onto the instrument, since it may leak into the cabinet and cause damage. Do not use chemicals containing benzine, benzene, toluene, xylene, acetone or similar solvents. After cleaning, make sure the instrument is dried completely before using. 55 CMM-17 Version 2.0 October 2004 56 CMM-17 Version 2.0 October 2004