User Guide Model 380942 True RMS AC/DC 30A Mini Clamp-on Meter APO Introduction Congratulations on your purchase of the Extech Model 380942 DC/AC Clamp Meter. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. Meter Description 1. Current sense jaw 2. Measurement Trigger 3. Function switch 4. Data HOLD key 5. MAX / MIN key 6. One-touch DCA ZERO key 7. LCD Display 8. Positive input terminal for Voltage 9. COM terminal 2 7 8 APO 1 3 456 9 Safety Symbols and Information ! Caution ! Risk of danger. Refer to accompanying documents Caution ! Risk of electric shock Earth (Ground) 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 high voltages. 3. DO NOT measure voltage if the voltage on the "COM" input jack exceeds 600V above earth ground. 4. ALWAYS turn off the power and disconnect the test leads before opening the back to replace the fuse or batteries. 5. NEVER operate the meter unless the back cover and the battery/fuse door are in place and fastened securely. 2 380942A-en-EU v1.2 7/14 Operation AC Current Measurements (True RMS) WARNING: To avoid electric shock, disconnect the test leads from the meter before making current measurements. 1) Set the Function switch to the 400mA, 4000mA, or 30A AC 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. Yes 3) Read the AC Current value on the LCD’s digital or bargraph display. No DC Current Measurements WARNING: To avoid electric shock, disconnect the test leads from the meter before making current measurements. 1) Set the Function switch to the mA or 30A DC range. 2) Press the DCA 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 DC Current value on the LCD’s digital or bargraph display. AC Voltage Measurements (True RMS) WARNING: To avoid electric shock or damage to the meter, do not make any voltage measurements that exceed the maximum specified limits. 1) Set the Function switch to the 400V AC position. 2) Insert the test leads to the meter as follows: Red lead to “V” terminal; Black lead to the COM input. 3) Connect the test leads to the circuit or device under test. 4) Read the AC Voltage value on the LCD’s digital or bargraph display. DC Voltage Measurements WARNING: To avoid electric shock or damage to the meter, do not make any voltage measurements that exceed the maximum specified limits. 1) Set the Function switch to the 400V DC position. 2) Insert the test leads to the meter as follows: Red lead to “V” terminal; Black lead to the COM input. 3) Connect the test leads to the circuit or device under test. 4) Read the DC Voltage value on the LCD’s digital or bargraph display. 3 380942A-en-EU v1.2 7/14 Advanced Features Relative Measurements 1) Press the ZERO key. The displayed reading will zero and the word ZERO will appear on the upper portion of the LCD. 2) All subsequent measurements will now be displayed with respect to the zeroed reading. For example, if a 20A reading is zeroed and a 30A reading is subsequently measured, the LCD will display 10A. 3) Press the zero button once more to return to normal operating mode. 4) Note that Relative mode is not available if MIN/MAX mode is enabled. 5) LCD displays relative numerical value without bargraph. Data Hold To freeze the current reading on the LCD, press the Data Hold 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 Data Hold key again. The word HOLD will switch off. MIN/MAX Readings Pressing the MIN/MAX key allows the meter to display ONLY the highest and the lowest readings encountered. Press the MIN/MAX key once to view the minimum reading, press it again to view the maximum reading. The LCD will toggle between the MIN and MAX values. Press and hold MIN/MAX button for more than 2 seconds to return to normal operating mode. Zero function will be disabled when MIN/MAX is enabled. Auto Power Off To extend battery life, the meter will auto power off after 15 minutes of operation. To resume operation, either turn the meter OFF and then ON again, or press the HOLD button. To disable the auto power off function, press down the “HOLD” key while turning the meter on. Maintenance Battery Replacement 1) When the low battery symbol appears on the LCD the batteries must be replaced. 2) Turn the meter OFF and remove the rear battery compartment Phillips screw. 3) Lift off the battery compartment cover and replace the two 1.5V AA batteries. 4) Replace the compartment cover and secure the screw. You, as the end user, are legally bound (EU Battery ordinance) to return all used batteries, disposal in the household garbage is prohibited! You can hand over your used batteries / accumulators at collection points in your community or wherever batteries / accumulators are sold! Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the end of its lifecycle Cleaning Caution: Use only a dry cloth to clean the plastic case. 4 380942A-en-EU v1.2 7/14 Specifications General Specifications Display 3-3/4 digit (4032 count) LCD with 40 segment bargraph Functions ACA, DCA, ACV, DCV Polarity Minus sign ( - ) indicates negative polarity Current sensor Hall effect sensor type Overload indication OL DCA zero adjust One touch zero key Display rate 3 readings/second (30 readings/second for bargraph) Battery Two 1.5V AA batteries Operating conditions -10 C to 50 C (4 F to 122 F); < 85% Relative Humidity Storage conditions -20 C to 60 C (- 4 F to 140 F); < 75% Relative Humidity o o o o o o o o Altitude Operate at less than 2000 meters (for indoor use only) Power consumption Approximately 15mA DC Weight 190g (6.2 oz.) including battery Dimensions 183 x 63.6 x 35.6mm (7.2 x 2.5 x 1.4”) (H x W x D) Jaw opening 23mm (0.9”) Standards IEC 1010 Category III 300V, Category II 600V Range Specifications Function Range DC Current Resolution 4000mA 1mA 30A 10mA 40A 10mA 40A DC ± (2.5% + 3d) 100A DC 40 to 100Hz ±(1.5% + 5d) ±(2.0% + 5d) 50/60Hz 40 to 1kHz 1mA ±(2.5% + 5d) ±(3.0% + 5d) 30A 10mA ±(2.0% + 5d) ±(2.5% + 5d) 400V 0.1V 400mA 0.1mA ± (1.0% + 2d) AC Voltage (True RMS) ± (2.0% + 3d) 50/60Hz 4000mA DC Voltage Overload protect 100A DC AC Current (True RMS) Accuracy (of reading) 400V 0.1V 40A AC 40A AC 100A AC 1000V DC 50/60Hz 40 to 1kHz ±(1.5% + 4d) ±(2.0% + 5d) 800V AC Specification Notes AC Voltage and Current Crest Factor: < 3 AC / DC Voltage Input Impedance: 10M Copyright © 2014 FLIR Systems, Inc. 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