Extech 380460 Operating Manual

User's Guide

Precision Milliohm Meters

Models 380460 and 380462

Introduction

Congratulations on your purchase of the Extech Milliohm Meter Model 380460 (110V) or
Model 380462 (220V). The milliohm meters are enclosed in rugged carrying cases for
durability. Measurements are made with Kelvin test leads (supplied) for optimal accuracy
in five (5) selectable ranges. Careful use of this meter will provide years of reliable
service.

Specifications

General Specifications

Circuit Custom one-chip LSI microprocessor circuit
Display 0.7" (18 mm) LCD with 2000 display counts
Measurement terminals 4-Terminal Kelvin type
Measurement ranges
Zero Adjust ±50 count adjustment
Sampling Time Approximately 0.4 seconds
Over input indication Indication of "1 - - -"
Operating Temperature 32 °F to 122 °F (0 °C to 50 °C)
Operating Humidity 80% Relative Humidity max.
Power Supply 110V (380460) or 220V (380462) ±15%, 50/60Hz
Power Consumption Less than 2 VA
Weight 1.32 lbs (600g)
Dimensions 6.3 x 4.72 x 3.35" (160 x 120 x 85 mm) with cover
Accessories Power Cable and 4-wire Kelvin clip leads

Range Specifications

Five (5) ranges (200m, 2, 20, 200, 2000Ω ohms)

Range Resolution

200 mΩ 0.1mΩ

2 Ω 1mΩ

20 Ω 10mΩ

200 Ω 0.1 Ω

2000 Ω 1 Ω

Note: Specifications tested using RF Field Strength <3V/m and frequency <30MHz

Test

Current

100mA ± 0.75% + 4 digits 3.8V

10mA ± 0.75% + 2 digits 3.4V
10mA ± 0.75% + 2 digits 3.4V

1mA ± 0.75% + 2 digits 3.2V
1mA ± 0.75% + 2 digits 3.2V

2

Accuracy

Model 380460 and 380462 Version 2.1 March 2005

Open Circuit

Voltage