Extech Instruments 380942 User manual

User Guide

Model 380942

True RMS AC/DC 30A Mini Clamp-on Meter

APO

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Extech 380947 400A AC/DC Clamp Meter

Extech 380942-NIST 30A True RMS AC / DC Mini Clamp Meter

Extech 380942 30A AC/DC Clamp Meter

380942A-en-EU v1.2 7/14

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

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.

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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.

3) Read the AC Current value on the LCD’s digital or bargraph display.

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.

Yes

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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.

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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 -10oC to 50oC (4oF to 122oF); < 85% Relative Humidity

Storage conditions -20oC to 60oC (- 4oF to 140oF); < 75% Relative Humidity

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 Resolution Accuracy (of reading) Overload

protect

DC Current 4000mA 1mA ± (2.0% + 3d) 40A DC

30A 10mA 100A DC

40A 10mA ± (2.5% + 3d) 100A DC

AC Current

(True RMS)

50/60Hz 40 to 100Hz

400mA 0.1mA ±(1.5% + 5d) ±(2.0% + 5d) 40A AC

50/60Hz 40 to 1kHz

4000mA 1mA ±(2.5% + 5d) ±(3.0% + 5d) 40A AC

30A 10mA ±(2.0% + 5d) ±(2.5% + 5d) 100A AC

DC Voltage 400V 0.1V ± (1.0% + 2d) 1000V DC

AC Voltage

(True RMS)

50/60Hz 40 to 1kHz

400V 0.1V ±(1.5% + 4d) ±(2.0% + 5d) 800V AC

Specification Notes

AC Voltage and Current Crest Factor: < 3

AC / DC Voltage Input Impedance: 10M

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