User’s Guide Model MA120 200A AC/DC Mini Clamp-on Meter • 3-2/3 digit (2400 count) LCD display • White LED backlight • Built-in non-contact AC voltage detector plus flashlight • Frequency measurement 40Hz to 1kHz • Autoranging with auto power off • 0.7” (18mm) Jaw opening Introduction Congratulations on your purchase of Extech’s MA120 AC/DC Mini Clamp Meter. This professional meter, with proper care, will provide years of safe reliable service. Specifications General Specifications Display 3-2/3 (2400 count) Digit LCD with white LED backlight Polarity Minus sign ( - ) indicates negative polarity Current sensor Hall effect sensor type Overload indication “OL” displayed on the LCD DCA zero adjust One touch zero key Display rate 2 readings/second, nominal Battery Two 1.5V AAA batteries Low Battery indication “BATT” displayed on the LCD Operating conditions 32 F to 86 F (0 C to 30 C) 90%RH; 86 F to 104 F (30 C to 40 C) º º º º 75%RH; 104 F to 122 F (40 C to 50 C) 45%RH Storage conditions - 14 F to 140 F (-30 C to 60 C); < 90% Relative Humidity Altitude Operate at less than 3000 meters Weight 6.2 oz. (176g) including battery Dimensions 6.5 x 2.6 x 1.3” (164 x 65 x 32mm) (HWD) Jaw opening 0.7” (18mm) Standards IEC 1010 Category III 300V, Category II 600V, º º º º º º º º º º º º CC Range Specifications Function Range Resolution Accuracy (of reading) DC Current 200A 0.1A ± (2.8% + 8 digits) AC Current 200A 0.1A ±(3.0% + 8 digits) Frequency 40-51Hz 0.01Hz ±(1.2% + 5 digits) (Auto-Ranging) 51-510Hz 0.1Hz Input Sensitivity: 2.5A AC RMS min. 0.51-1kHz 0.001kHz Non-Contact AC Voltage 100VAC to 600VAC 50/60Hz 2 MA120 Ver. 1.2 10/2004 Meter Description 5. Data HOLD and Backlight key 6. LCD display 7. Clamp trigger 8. One-touch DCA ZERO key 1. Current sense jaw 2. Non-contact AC voltage indicator light 3. Flashlight button 4. Rotary function switch 2 1 3 4 5 7 6 8 Safety Information ! Caution! Refer to the explanation in this Manual Double Insulation This meter has been designed to be safe in use, but the operator must use caution in its operation. The rules listed below should be carefully followed for safe operation. 1. NEVER apply voltage or current to the meter that exceeds the specified maximum: 2. USE EXTREME CAUTION when working with voltages greater than 60VDC or 25VAC rms. These voltages are considerd a shock hazard. 3. NEVER operate the meter unless the back cover and the battery/fuse door are in place and fastened securely. Input Limits Function Maximum Input AC Current 200A DC Current ±200A Frequency 1kHz 3 MA120 Ver. 1.2 10/2004 Operation AC Current Measurements 1) Set the Function switch to the ACA range. 2) Press the jaw trigger and clamp around, fully enclosing a single conductor. Do not allow a gap between the two halves of the jaw. Refer to the diagram at right for the correct way to enclose a single conductor. 3) Read the ACA value on the LCD. Yes No DC Current Measurements 1) Set the Function switch to the DCA range. 2) Press the ZERO key to null the meter display. 3) Press the Trigger to open the current sense Jaw. 4) Fully enclose the conductor to be measured. Do not allow a gap between the two halves of the jaw. 5) Read the DCA value on the LCD. Non-Contact AC Voltage Detection WARNING: Risk of Electrocution. Before use, always test the Voltage Detector on a known live circuit to verify proper operation 1) AC Voltage detection operates on any of the four Function switch positions. 2) Touch the probe tip to the hot conductor or insert into the hot side of the electrical outlet. 3) If AC voltage is present, the detector light will illuminate. NOTE: The conductors in electrical cord sets are often twisted. For best results, slowly slide 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 turn the detector light on. This is normal operation Frequency Measurements 1) Set the Function switch to the Hz position. 2) Fully enclose the conductor to be measured. Do not allow a gap between the two halves of the jaw. 3) Read the Frequency value on the LCD. Flashlight Press and hold the top button to turn the flashlight on. Release the button to turn the flashlight off. Data Hold To freeze the current reading on the LCD, press the “Hold / Backlight” key. The word HOLD will appear on the LCD while the meter is in the Data Hold mode. To release the Data Hold function and return the meter to normal operation, press the “Hold / Backlight” key again. The word HOLD will switch off. 4 MA120 Ver. 1.2 10/2004 Backlight Display Press and hold the “Hold / Backlight” key for more than 2 seconds to turn on the backlight. This will also activate the Data Hold function. To release the Data Hold function and return the meter to normal operation, press the Data Hold key momentarily. To turn off the backlight, press and hold the “Hold Backlight” key for more than 2 seconds. Maintenance Battery Replacement 1) When the low battery symbol appears on the LCD the batteries must be replaced. 2) Power down and remove the rear battery compartment Phillips screw. 3) Lift off the battery compartment cover and replace the two 1.5V AAA cells. 4) Replace compartment cover and secure the screw. Cleaning Caution: Use only a dry cloth to clean the plastic case. 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 Service Department for information on calibration services available for this product. Extech recommends that annual calibrations be performed to verify meter performance and accuracy. Warranty EXTECH INSTRUMENTS CORPORATION warrants the basic instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies on 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 EXTENSION 210 for authorization or visit www.extech.com for more 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 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 © 2004 Extech Instruments Corporation. All rights reserved including the right of reproduction in whole or in part in any form. 5 MA120 Ver. 1.2 10/2004