User's Guide 600Amp AC/DC True RMS Clamp Meter Model MA640 Introduction Congratulations on your purchase of this Extech MA640 True RMS Clamp Meter. This meter measures AC/DC Current, AC/DC Voltage, Resistance, Capacitance, Frequency, Diode Test, Duty Cycle and Continuity. Special features include Thermocouple Temperature and NonContact Voltage detection. The double molded case is designed for heavy duty use. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. Safety International Safety Symbols This symbol, adjacent to another symbol or terminal, indicates the user must refer to the manual for further information. This symbol, adjacent to a terminal, indicates that, under normal use, hazardous voltages may be present Double insulation WARNING This WARNING symbol indicates a potentially hazardous situation, which if not avoided, could result in death or serious injury. CAUTION This CAUTION symbol indicates a potentially hazardous situation, which if not avoided, may result damage to the product. PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY OVERVOLTAGE CATEGORY I Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in which measures are taken to limit the transient overvoltages to an appropriate low level. Note – Examples include protected electronic circuits. OVERVOLTAGE CATEGORY II Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied from the fixed installation. Note – Examples include household, office, and laboratory appliances. OVERVOLTAGE CATEGORY III Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations. Note – Examples include switches in the fixed installation and some equipment for industrial use with permanent connection to the fixed installation. OVERVOLTAGE CATEGORY IV Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the installation. Note – Examples include electricity meters and primary over-current protection equipment 2 MA640 V2.1 07/08 SAFETY NOTES • • • • Do not exceed the maximum allowable input range of any function. Do not apply voltage to meter when resistance function is selected. Set the function switch OFF when the meter is not in use. Remove the battery if meter is to be stored for longer than 60 days. WARNINGS • • • • Set function switch to the appropriate position before measuring. When measuring volts do not switch to current/resistance modes. Do not measure current on a circuit whose voltage exceeds 600V. When changing ranges always disconnect the test leads from the circuit under test. CAUTIONS • • • • • • • Improper use of this meter can cause damage, shock, injury or death. Read and understand this user manual before operating the meter. Always remove the test leads before replacing the battery or fuses. Inspect the condition of the test leads and the meter itself for any damage before operating the meter. Repair or replace any damage before use. Use great care when making measurements if the voltages are greater than 25VAC rms or 35VDC. These voltages are considered a shock hazard. Always discharge capacitors and remove power from the device under test before performing Diode, Resistance or Continuity tests. Voltage checks on electrical outlets can be difficult and misleading because of the uncertainty of connection to the recessed electrical contacts. Other means should be used to ensure that the terminals are not "live". If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. Function Maximum Input A AC/DC, 600A DC/AC V DC, V AC 600V DC/AC Resistance, Capacitance, Frequency, Diode Test 250V DC/AC Type K Temperature 30V DC, 24V AC 250V DC/AC 3 MA640 V2.1 07/08 Description Meter Description 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. Current clamp Clamp opening trigger Hx % Button MODE Button LCD Display Common Input jack NCV sensor NCV LED indicator HOLD/BACKLIGHT Button and FUNCTION switch RANGE Button MAX-MIN Button RELATIVE Button Battery compartment (rear) Positive Input jack Display icons Description HOLD AUTO DC AC MAX MIN REL V Ω A F Hz % o o F and C n, m, μ, M, k •))) Data Hold Autoranging Direct Current Alternating Current Max reading Min reading Low battery Relative Volts (Voltage) Ohms (Resistance) Amperes (Current) Farad (Capacitance) Hertz (Frequency) Duty Ratio Fahrenheit and Celsius units (Temperature) Unit of measure prefixes: nano, milli, micro, mega, and kilo Continuity test Diode test 4 MA640 V2.1 07/08 Operation NOTES: Read and understand all Warning and Caution statements in this operation manual prior to using this meter. Set the function select switch to the OFF position when the meter is not in use. Non-Contact Voltage Detector WARNING: Risk of Electrocution. Before use, always test the Voltage Detector on a known live circuit to verify proper operation. 1. Rotate the Function switch to any measurement position. 2. Place the detector probe tip on the conductor to be tested. 3. If AC voltage is present, the NCV detector light will turn on with a steady red light. NOTE: The conductors in electrical cord sets are often twisted. For best results, move the probe tip along a length of the cord to assure placing the tip in close proximity to the live conductor. NOTE: The detector is designed with high sensitivity. Static electricity or other sources of energy may randomly trip the sensor. This is normal operation. AC/DC Current Measurements WARNING: Disconnect the test leads before making clamp measurements. 1. Rotate the Function switch to the 600A AC or DC position 2. Press the trigger to open jaw. Fully enclose only one conductor. 3. Read the current value in the display. 4. If the value is less than 60A, rotate the function switch to the 60A position to improve resolution. DCA Zero The REL feature removes offset values and improves accuracy for DC current measurements. To perform a zero, select ADC and, with no conductor in the jaw, press and the REL button. The display will zero. The offset value is now stored and removed from all measurements. 5 MA640 V2.1 07/08 AC/DC Voltage Measurements CAUTION: Do not measure voltages if a motor on the circuit is being switched ON or OFF. Large voltage surges may occur that can damage the meter. 1. Rotate the function switch to the V position. 2. Press the MODE button to select AC or DC Voltage. 3. Insert the black test lead banana plug into the negative COM jack. Insert the red test lead banana plug into the positive V jack. Touch the black test probe tip to the negative side of the circuit. Touch the red test probe tip to the positive side of the circuit. Read the voltage value in the display. 4. 5. Resistance Measurements Note: Remove power from the device under test before making resistance measurements 1. Rotate the function switch to the Ω position. 2. Insert the black test lead banana plug into the negative COM jack. Insert the red test lead banana plug into the positive V jack. 3. Touch the black test probe tip to one side of the device. Touch the red test probe tip to the other side of the device. 4. Read the resistance value in the display. Continuity Test 1. Connect as described for resistance measurements. 2. Press the MODE button to select continuity •) )). 3. Touch the test probe tips across the circuit or component under test. 4. If the resistance is < 60Ω, a tone will sound. 6 MA640 V2.1 07/08 Diode Test 1. Connect as described for resistance measurements 2. Press the MODE button to select diode test 3. Touch the test probe tips to the diode or semiconductor junction under test. Note the meter reading. 4. Reverse the test lead polarity by reversing the red and black leads. Note this reading. 5. The diode or junction can be evaluated as follows: . If one reading displays a value (typically 0.400V to 01.800V) and the other reading displays OL, the diode is good. If both readings display OL the device is open. If both readings are very small or ‘0’, the device is shorted. Capacitance Measurements WARNING: To avoid electric shock, discharge the capacitor before measuring. 1. Rotate the function switch to the CAP capacitance position. 2. Press the MODE button to select nF capacitance test 3. Insert the black test lead banana plug into the negative COM jack. jack. Insert the red test lead banana plug into the positive 4. Touch the black test probe tip to one side of the device. Touch the red test probe tip to the other side of the device. 5. Read the capacitance value in the display. Note: For very large values of capacitance measurement time can be several seconds before the final reading stabilizes. 7 MA640 V2.1 07/08 Frequency and Duty Ratio Measurements 1. Rotate the function switch to the Hz Position. 2. Press the MODE button to select AC Voltage 3. Press the HZ % button to select HZ 4. Insert the black test lead banana plug into the negative COM jack. Insert the red test lead banana plug into the positive Hz jack. 5. Touch the black test probe tip to one side of the device. Touch the red test probe tip to the other side of the device. 6. Read the Frequency value on the display. 7. Press the HZ % button to select % 8. Read the Duty Ratio on the display. Type K Temperature Measurements 1. Rotate the function switch to the Temp position. 2. Press the MODE button to select °F or °C. 3. Insert the Temperature Probe into the input jacks. 4. Place the temperature probe tip where needed. 5. Read the temperature on the display. Note: In case of an open input or a temperature overrange, the meter will display “OL”. 8 MA640 V2.1 07/08 Data Hold To freeze the LCD reading, press the HOLD button. While data hold is active, the HOLD icon appears on the LCD. Press the HOLD button again to return to normal operation. MAX/MIN 1. 2. 3. Press the MAX/MIN button to activate the MAX/MIN recording mode. The display icon "MAX" will appear. The meter will begins recording and displaying the maximum value measured. Press the MAX/MIN button and “MIN” will appear. The meter will display the minimum value measured during the recording session. To exit MAX/MIN mode press and hold the MAX/MIN button for 2 seconds. RANGE In the Voltage, Resistance, Frequency or Temperature function the meter automatically selects the best range for the measurements being made. For measurement situations requiring that a range be manually selected, perform the following: 1. 2. 3. Press the RANGE button. The “AUTO” display icon will turn off. Press the RANGE key to step through the available ranges. Observe the decimal point and units displayed until the preferred range is located. To exit the Manual Ranging mode and return to Autoranging, press and hold the RANGE key for 2 seconds. LCD Backlight The LCD is equipped with backlighting for easier viewing, especially in dimly lit areas. button for 2 seconds to turn the backlight on. The backlight Press and hold the HOLD/ will automatically turn off after 5 seconds. Automatic Power OFF In order to conserve battery life, the meter will automatically turn off after approximately 15 minutes of operation. The meter will beep shortly before the meter shuts off. If a button is pressed, the APO timer will reset. If the meter is allowed to shut off, turn the function switch to the OFF position and then to the function again to restart. Low battery indication When the icon appears in the display, the battery should be replaced. Refer to the battery replacement procedure in the maintenance section. 9 MA640 V2.1 07/08 Maintenance WARNING: To avoid electrical shock, disconnect the meter from any circuit, remove the test leads from the input terminals, and turn OFF the meter before opening the case. Do not operate the meter with an open case. Cleaning and Storage Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives or solvents. If the meter is not to be used for 60 days or more, remove the battery and store it separately. Battery Replacement 1. Remove the Phillips head screws that secures the rear battery door 2. Open the battery compartment 3. Replace the 9V battery 4. Secure the battery compartment door Warranty EXTECH INSTRUMENTS CORPORATION(a FLIR company) warrants this instrument to be free of defects in parts and workmanship for one year 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. Calibration and Repair Services Extech offers repair and calibration services for the products we sell. Extech also provides NIST certification for most products. Call the Customer Care Department for information on calibration services available for this product. Extech recommends that annual calibrations be performed to verify meter performance and accuracy. 10 MA640 V2.1 07/08 Specifications 0.01A Accuracy (% of reading + digits) ±(2.8% + 8 digits) 600.0 AAC 0.1A ±(3.0% + 8 digits) 60.00 AAC 0.01A ±(2.8% + 5 digits) 600.0 ADC 0.1A ±(3.0% + 5 digits) 6.000 VAC 0.001V 60.00 VAC 0.01V 600.0 VAC 0.1V Function Range AC Current 60.00 AAC 50/60 Hz True RMS DC Current AC Voltage True RMS DC Voltage Resistance Capacitance Frequency Resolution ±(1.8% + 8 digits) 600.0 mVDC 0.1mV 6.000 VDC 0.001V 60.00 VDC 0.01V 600.0 VDC 0.1V 600.0Ω 0.1Ω 6.000kΩ 0.001kΩ 60.00kΩ 0.01kΩ 600.0kΩ 0.1kΩ 6.000MΩ 0.001MΩ ±(2.5% + 3 digits) 60.00MΩ 0.01MΩ ±(3.5% + 5 digits) 40.00nF 0.01nF ±(4.0% + 20 digits) 400.0nF 0.1nF 4.000µF 0.001µF 40.00µF 0.01µF 400.0µF 0.1µF ±(4.0% + 10 digits) 4000µF 1µF ±(5.0% + 10 digits) 0.01Hz to 0.01khz ±(1.5% + 2 digits) 0.1% ±(1.2% + 2 digits) 10Hz to 10kHz ±(1.5% + 2 digits) ±(1.0% + 4 digits) ±(1.5% + 2 digits) ±(3.0% + 5 digits) Sensitivity: 15Vrms Duty Cycle 0.5% to 99.0% Pulse width: 100μs to 100ms, Frequency: 10Hz to 10kHz Temperature Type K -4 to - 1400°F 0.1° <800°; 1° >800° -20 to 760°C 0.1° <400°; 1° >400° ±3% reading + 9°F/5°C Specification does not include probe accuracy 11 MA640 V2.1 07/08 General Specifications Clamp jaw opening Display Continuity check Diode test Low Battery indication Over-range indication Measurement rate Thermocouple sensor Input Impedance AC current bandwidth AC voltage bandwidth AC response Crest Factor Operating Temperature Storage Temperature Operating Humidity Storage Humidity Operating Altitude Battery Auto power OFF Dimensions & Weight Safety Approvals 1.5" (40mm) approx. 6000 count backlit LCD Threshold 60Ω; Test current < 0.35mA Test current of 0.9mA typical; Open circuit voltage [ 2.8VDC typical Battery symbol is displayed ‘OL’ display 2 readings per second, nominal Type K thermocouple required 10MΩ (VDC and VAC) 50/60Hz 50 to 400Hz True rms (AAC and VAC) 3.0 in 60A and 600A ranges, (50/60Hz and 5% to 100% of range) 41°F to 104°F (5°C to 40°C) -4°F to 140°F (-20°C to 60°C) Max 80% up to 87°F (31°C) decreasing linearly to 50% at 104°F(40°C) <80% 7000ft. (2000meters) maximum. One (1) 9V Battery (NEDA 1604) After approx. 15 minutes, with disable 9.2x3x1.53” (232x77x39mm); 9.56 oz. (271g) For indoor use and in accordance with the requirements for double insulation to IEC1010-1 (2001): EN61010-1 (2001) Overvoltage Category III 600V and Category II 1000V, Pollution Degree 2. CE, Support line (781) 890-7440 Technical support: Extension 200; E-mail: [email protected] Repair & Returns: Extension 210; E-mail: [email protected] Product specifications subject to change without notice For the latest version of this User’s Guide, Software updates, and other up-to-the-minute product information, visit our website: www.extech.com Copyright © 2008 Extech Instruments Corporation (a FLIR company) All rights reserved including the right of reproduction in whole or in part in any form. 12 MA640 V2.1 07/08