Extech Instruments 380943 User manual

User Manual

Model 380943

High Resolution 60 Amp AC Clamp-on Meter

•4000 Count Display with 10uA Resolution

•20 reading per second bargraph

•Shielded transformer jaws

•Selectable filter circuit

•MAX/MIN, Relative, & Hold functions

•1.2” (30mm) jaw diameter

Introduction

Thank you for selecting the Extech 380943 AC Clamp Meter. This device is ideal for

checking leakage, ground, and sheath current. This professional meter, with proper care,

will provide years of safe reliable service.

Model 380943 Ver. 2.1 11/2002

Specifications

General Specifications

Display 3-3/4 digit (4000 count) LCD with 40 segment bargraph

Functions ACA, ACV, Resistance, and Continuity

Polarity Minus sign ( - ) indicates negative polarity

Overload indication Left blinking digit

Relative Mode ZERO front panel key

Display rate 2 readings per second (20 readings per second for bargraph)

Battery Two 1.5V AA batteries

Operating conditions 40F to 1220F (-100C to 500C); < 85% Relative Humidity

Storage conditions - 40F to 1400F (-200C to 600C); < 75% Relative Humidity

Altitude Operate at less than 2000 meters (Indoor use only)

Power consumption Approximately 10mA DC

Weight 7 oz. (200g) including battery

Dimensions 8.3 x 2.4 x 1.4” (210 x 62 x 35.6mm) (HWD)

Jaw opening 1.2” (30mm)

Standards IEC 1010 Category III 300V, Category II 600V

Range Specifications

Range / Resolution Accuracy

50/60Hz

Accuracy

40Hz to 1Khz

Overload

Protection

AC Current

40.00mA ± (1.0% + 3 digits) ± (2.0% + 5 digits)

400.0mA ± (1.0% + 3 digits) ± (2.0% + 3 digits)

4.000A ± (1.0% + 3 digits) ± (2.0% + 3 digits)

40.00A ± (1.0% + 3 digits) ± (2.0% + 3 digits)

60.0A (0 to 50A)* ± (1.5% + 3 digits) ± (3.0% + 5 digits)

60.0A (50 to 60A)* ± (3.0% + 5 digits) ± (3.5% + 5 digits)

100A AC

AC Voltage

400.0V ± (1.5% + 2 digits) ± (2.0% + 4 digits) 800V AC

Resistance and Continuity

Range Accuracy Audible

Continuity

Overload

Protection

40.0 to 400.0Ω± (1.5% + 2d) Beeps < 38Ω600V AC

Specification Notes

•Open Circuit Voltage: 0.4V

•AC Voltage Input Impedance: 10MΩ

•Accuracy specified at 25oC

* Displays over 60A are possible but the accuracy of such measurements is not specified

Model 380943 Ver. 2.1 11/2002

Meter Description

1. Current sensing jaws

2. Jaws opening trigger

3. Function switch

4. Data HOLD key

5. MAX / MIN key

6. ZERO (Relative) key

7. LCD Display

8. Frequency select slide switch

9. Positive input terminal for V and Ω

10. Negative (COM) input terminal

Safety Information

!Caution ! Refer to the explanation in this Manual

Caution ! Risk of electric shock

Earth (Ground)

Double Insulation

This meter has been designed with safety in mind, but the operator must use caution. 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 meter to

replace the fuse or the batteries.

5. NEVER operate the meter unless the back cover and the battery/fuse door are in place

and fastened securely.

1 2 5 6 7 9

3 4 8 10

Model 380943 Ver. 2.1 11/2002

Operation

Using the Frequency Selector Switch

50/60Hz position (low pass filter)

Use the 50/60Hz position when measuring circuits with a frequency bandwidth of 50/60Hz.

Since the meter has superior frequency response, measurement results may include

higher frequencies and harmonics of the fundamental frequency. Putting this switch in the

50/60 position activates the meter’s low pass filter minimizing the affects of high frequency

noise. The filter’s cut-off frequency is 100Hz with 24dB/octave attenuation (approx.).

WIDE Position (for high frequencies)

Put the slide switch in the WIDE position if the circuit under test is a high frequency

generating device (up to 1KHz) such as an inverter, switching regulator, etc. To verify the

presence of a high frequency signal, take measurements in both switch positions. If the

readings are widely different, then a high frequency signal can be assumed present.

AC Current Measurements

Basic Current Measurement Procedure

WARNING: To avoid electric shock, disconnect the test leads from the meter before

making current measurements.

1. Set the Function switch to the desired current range.

2. Set the Frequency slide switch to the appropriate position (refer to the paragraph

above to determine which position to use).

3. Press the jaw trigger to open the clamp jaws and clamp around the conductor(s)

ensuring they’re fully enclosed by the clamp jaws.

4. Refer to the applications diagrams below for specific measurement configurations.

5. Read the ACA value on the LCD digits and the bargraph.

AC Current Applications

Load Current Measurments

Model 380943 Ver. 2.1 11/2002

Leakage Current on Unbalanced Loads

Ground Conductor Leakage Single Phase 2-Wire Leakage

Three Phase 3-Wire Leakage Three Phase 4-Wire Leakage

AC 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 Voltage position.

2. Set the Frequency Slide Switch to the appropriate position (refer to the section “Using

the Frequency Slide Switch” earlier in this manual).

3. Insert the test leads to the meter as follows: Red lead to the red ‘V’ input terminal;

Black lead to the black COM input terminal.

4. Connect the test leads to the circuit or device under test (see diagram example below).

5. Read the ACV value on the meter’s display (LCD digits and bargraph).

Table of contents

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