Extech Instruments 38394 User Manual

User’s Guide

Digital AC/DC Clamp Meter
Model 38394

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Introduction

Congratulations on your purchase of Extech’s 38394 AC/DC Clamp Meter. This clamp
meter measures AC/DC Current to 600A, DC/AC Voltage, Resistance, Frequency,
Diode, and Continuity. This meter is shipped fully tested and calibrated and, with proper
use, will provide years of reliable service.

Safety

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 indicates that a potentially hazardous condition which, if not avoided,

could result in death or serious injury.

CAUTION: This indicates that a potentially hazardous condition which, if not avoided,

could result in injury or damage to the meter.

Safety Precautions

WARNING: Improper use of this meter can cause damage, shock, injury or death. Read and

understand this User Guide before operating the meter.

1. Always remove the test leads before making current measurements

2. Always remove the test leads before replacing the batteries

3. Inspect the condition of the clamp jaw, test leads and the meter for any damage
before operating the meter. Repair any damage or replace meter before use

4. Do not exceed the maximum rated input limits

5. Use great care when making measurements, especially when the voltages are
greater than 25VAC rms or 35VDC. These voltages are considered a shock hazard

6. Always discharge capacitors and remove power from the DUT (device under test)
before performing Resistance or Continuity tests

7. Remove the batteries from the meter if the meter is to be stored for long periods

8. Ensure that the selected meter function matches the measurement to be taken

9. If the measured current is higher than the range selected for long periods,
overheating may occur compromising the safety and the operation of the meter’s
internal circuits

10. To avoid discharge risks and erroneous readings, do not measure current on high
voltage conductors (>600V)

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38394 V3.3 8/08

Specifications

Function Range Accuracy
AC/DC Current

AC Voltage 4.000V, 40.00V, 400.0V, 600 V ±(1.2% rdg + 5d)

Resistance

Frequency (≥ 5V)

Continuity
Input Limits

Conductor Size 1.18" (30mm) maximum
Battery type Two (2) 1.5V AA batteries
Range Selection Automatic ranging
Display 5000 Count LCD
Overload Indication "1" or “-1”
Low Battery Indication Battery icon
Environmental conditions Installation Category III (clamp); Category II (DMM),

Operating Temperature/Humidity 32º to 122ºF (0
Storage Temperature/Humidity 14º to 140ºF (-10
Dimensions 7.0 x 2.5 x 1.3” (178 x 64 x 33mm)
Weight 8.3 oz. (230g)
Zero Adjust REL (Relative) push button
Diode Short/Open, Good/Defect Test
Sample Time 0.35 sec approx.
Input Impedance 10MΩ for ACV & DCV

400.0A (AC Amps 0.5 to 400.0A) ±(2% rdg + 5d)

600A ±(2% rdg + 8d)

400.0mV ±(0.5% rdg +2d) DC Voltage

4.000V, 40.00V, 400.0V, 600V ±(1.0% rdg + 2d)

400.0Ω, 4.000kΩ, 40.00kΩ, 400.0kΩ

4.000MΩ

40.00MΩ

5.000Hz, 50.00Hz, .500.0Hz, 5.000kHz,

50.00kHz, 100.0kHz
Audible tone <10Ω approximately

Function

V DC/AC 600V DC or

A DC/AC 600A DC/AC,

Maximum

Input

AC Peak

fused

Pollution degree 2; Altitude: 2000 meters, Indoor use
only

Function

Frequency 250V DC or AC peak

Resistance 400V DC or AC peak

o

C to 50oC) / <80% RH

o

(AC @ 50/60Hz)

(AC @ 50/60Hz)

±(1% rdg + 5d)
±(2% rdg + 2d)
±(3.5% rdg + 5d)
±(1% rdg + 5d)

Maximum

Input

(<10 seconds)

C to 60oC) / <80% RH

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38394 V3.3 8/08