Extech Instruments 380460 Manuale utente

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.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Back to the Extech 380460 Product Page

Model 380460 and 380462 Version 2.1 March 2005

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 Five (5) ranges (200m, 2, 20, 200, 2000Ωohms)

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

Range

Resolution

Test

Current

Accuracy

Open Circuit

Voltage

200 mΩ0.1mΩ100mA ± 0.75% + 4 digits 3.8V

2 Ω1mΩ10mA ± 0.75% + 2 digits 3.4V

20 Ω10mΩ10mA ± 0.75% + 2 digits 3.4V

200 Ω0.1 Ω1mA ± 0.75% + 2 digits 3.2V

2000 Ω1 Ω1mA ± 0.75% + 2 digits 3.2V

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

Model 380460 and 380462 Version 2.1 March 2005

Meter Description

1. LCD Display

2. Zero adjust knob

3. Range Dial

4. Power switch

5. 200mΩselect switch

6. AC power cord

7. Kelvin lead to meter connections

8. Carrying case

Operation

Basic Principles of 4-wire Measurements

For each range, the meter provides a specific amount of test current (refer to General

Specifications) which flows from the HI to the LO meter terminal and therefore from the HI

to the LO clip lead (Refer to the diagram). This is the current that ultimately passes through

the device under test (RX in diagram below).

Once the test current is applied to the device under test, clip leads Rx1 & Rx2 measure the

voltage drop across the device under test. The following equations detail how the meter

accomplishes its measurement tasks.

LO HI

Rx1 Rx2

White

bands

Device under test

To Meter

Model 380460 and 380462 Version 2.1 March 2005

Measurement Equations

Vx = Is x Rx;

Where Vx is the voltage (measured by the meter) across the device under test; Is is the

test current; Rx is the resistance of the device under test. From Vx = Is x Rx, the meter

moves to the next step which is: Rx = Vx/Is. With this equation the meter determines the

resistance of the device under test. Note that the measured resistance (Rx1 & Rx2) is not

affected by stray resistance since the test current is supplied directly to the device under

test. This is the advantage of the 4-wire Kelvin lead configuration over 2-wire methods

which introduce errors into low resistance measurements.

International Symbols

Powering the Meter

Connect the meter to the correct power source (110 or 220VAC); the Model 380460 uses

110VAC and the Model 380462 uses 220VAC (note that these meters are NOT

interchangeable). Do not apply voltage to the meter input measurement terminals. Meter

damage may result.

Measurement Procedure

1. Rotate the Range select switch to the 200m range to prepare for zeroing. Ensure that

200m is selected on the 200m select switch.

2. Perform a Zero Adjustment per the following:

•Short the Kelvin Clips as shown in the diagram below.

•Rotate the Zero Adjust Knob until the meter indicates zero units.

3. Select the desired measuring range via the rotary Range select switch. When using the

200m range, put the 200m select switch to the 200m position; for all other

measurements put this switch in the opposite position.

4. Either clip the leads onto a component or clip the leads between two points in a circuit.

5. Observe the meter reading.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

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