Extech Instruments 380947 User Manual

User's Guide

True RMS AC/DC Mini Clamp Meter

Model 380947

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this 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
[phone] ext. 210 for authorization or visit our website at www.extech.com
contact 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.

Introduction

Congratulations on your purchase of the Extech 380947 True RMS Clamp Meter. This
Clamp meter measures current up to 400A DC/AC and measures Frequency up to 100
kHz. Careful use of this meter will provide years of reliable service.

Safety

1. NEVER exceed the specified voltage/current maximum

2. USE EXTREME CAUTION when working with high voltages.

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

International Safety Symbols

for

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Specifications

General Specifications

Display 3-3/4 Digit LCD with 40 segment bargraph
Functions Current (ACA, DCA) and Frequency (Hz)
Polarity “-“ indicates negative polarity (positive polarity assumed)
Current sensor Hall effect
Overload Display indicates “1___” or “-1___”
DCA zero adjust One-touch zero key (also used as a Relative function)
Display rate 2 readings/second (20 readings/second for bargraph)
Battery Two 1.5V AA batteries
Operating temperature 40F to 1220F (-100C to 500C)
Operating Humidity < 85% RH
Power consumption 10mA DC approx.
Weight 6.2 oz. (190g) including battery
Dimensions 7.2 x 2.5 x 1.4” (183 x 63.6 x 35.6mm) (H x W x D)
Jaw opening 0.9” (23mm)
Standards IEC 1010 Category III 300V, Category II 600V

Range Specifications

DC Current Resolution Accuracy (of rdg + digits) Overload Protect

40A 10mA ±(1.0% + 2d) 400A DC
400A (0 to 150A) 100mA ±(1.0% + 2d) 400A DC
400A (150 to 200A) 100mA ±(2.2% + 2d) 400A DC
400A (200 to 400A) 100mA ±(4.0% + 2d) 400A DC

AC Current Resolution 50/60Hz 40Hz - 1kHz Overload Protect

4A (0 to 500mA) 1mA ±(1.5% + 7d) ±(2.0% + 7d) 400A AC
4A (500mA to 4A) 1mA ±(1.5% + 3d) ±(2.0% + 4d) 400A AC
40A 10mA ±(1.5% + 3d) ±(2.0% + 4d) 400A AC
100A (0 to 100A) 100mA ±(1.5% + 3d) ±(2.0% + 4d) 500A AC
400A (100 to 200A) 100mA ±(2.2% + 3d) ±(2.5% + 4d) 500A AC
400A (200 to 400A) 100mA ±(4.0% + 3d) ±(5.0% + 4d) 500A AC

Frequency (Hz) Resolution Accuracy Sensitivity Overload Protect

40Hz to 250Hz 0.01 to 0.1Hz ±(0.5% + 2d) 3.0A 500A AC
250Hz to 10kHz 0.1 to 1Hz ±(0.5% + 2d) 0.3A 500A AC

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380947 V3.0V 10/06