Extech Instruments 380560 User manual

User's Guide

High Resolution Benchtop MilliOhm Meter

Models 380560 and 380562

Introduction

Congratulations on your purchase of the Extech 380560 (117V) or 380562 (220V) High

Resolution MilliOhm Meter. This device offers seven resistance ranges with resolution as

low as 0.01mΩ. The 4-wire Kelvin clip connection ensures optimum accuracy. The built-

in comparator feature offers HI-LO-GO testing. Typical applications include transformer,

motor coil, and PC Board resistance measurements. Careful use of this meter will

provide years of reliable service.

380560, Version 1.6, 04/03

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 (781)

890-7440 ext. 210 for authorization or visit our website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service

Department’ to request an RA number). 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.

Specifications

General Specifications

Circuit Custom one-chip LSI microprocessor circuit

Display 0.7" (18 mm) 2000 Count LED Display

Connection type 4-Terminal Kelvin

Measurement ranges Seven ranges (see listing below)

Test voltage 5V DC

Comparator Built-in HI/LO/GO testing with audible beeper

Zero adjust Automatic (no adjustment necessary)

Over-range indication Display reads "1____" when the reading is out of range

Operating Temperature 32°F to 122°F (0°C to 50°C)

Operating Humidity Max. 80% RH

Power Supply 110V (380560) or 220V (380562) ±15%, 50/60Hz

Weight 4.85 lbs (2.2kg)

Dimensions 11 x 8 x 3.5" (280 x 210 x 90mm)

Range Specifications

Range Resolution Test Current Accuracy (%rdg) Test Voltage

20 mΩ0.01mΩ1A ± (0.2% + 6 digits) 2.7V DC

200 mΩ0.1mΩ1A 3.3V DC

2 Ω.001Ω0.1A 3.5V DC

20 Ω.01Ω10mA 4.1V DC

200 Ω0.1 Ω1mA

2K Ω.001kΩ0.1mA

20K Ω.01kΩ10uA

± (0.2% + 4 digits)

4.5V DC

Note: Specifications based on RF Field Strength <3V/m and frequency <30MHz

International Symbols

380560, Version 1.6, 04/03

F+

S+

F-

S-

White Bands

Meter Description

1. LED Display

2. HI/LO/GO Status Indicators

3. Power and Range pushbuttons

4. Kelvin clip leads

5. SET/TEST and HI/LO pushbuttons

6. Comparator adjustment screws

7. Kelvin clip lead input terminals

Note: The power cable input and audible alert button are on the rear of the instrument.

Measurement Precautions

Ensure that the meter is connected to the correct power source

(110V for model 380560 or 220V for model 380562).

Do not apply voltage to the meter input terminals. Meter damage may result.

Measurement Procedure

1. Connect the Kelvin test leads to the meter.

2. Press the POWER pushbutton to turn power on.

3. Position the SET/TEST pushbutton to the TEST position.

4. To check the meter zero, clip the test leads

together as shown at right.

5. Select the desired measuring range using

the labeled black pushbuttons. When the resistance of the device is unknown, start

with the highest range and work downward.

6. Clip the leads onto the device under test as shown below.

7. Observe the reading on the LED display.

5 6 7

F + S+ S - F -

380560, Version 1.6, 04/03



Support Hotline (781) 890-7440

Tech support: Ext. 200; Email: support@extech.com

Repair/Returns: Ext. 210; Email: repair@extech.com

Website: www.extech.com

Comparator Operation (HI-LO-GO)

The meter is equipped with a Comparator function allowing the user to sort resistance

measurements against programmable HIGH and LOW limits. To program the comparator:

1. Position the SET/TEST pushbutton to SET.

2. Position the LO/HI pushbutton to LO.

3. Adjust the LO comparator screw to the desired low limit (shown on the LED display).

4. Position the LO/HI pushbutton to HI.

5. Adjust the HI comparator screw to the desired high limit.

6. Position the SET/TEST pushbutton to TEST.

7. Set the rear buzzer switch ON or OFF. When ON, the meter will sound an audible tone

for each GO measurement.

Each time a measurement is taken, the appropriate Comparator status LED will light. If the

measurement is lower than the LO setting, the LO LED will light. If the measurement is

higher than the HI setting, the HI LED will light. If the reading is between the HI and LO

settings, the green GO LED will light. If the rear beeper pushbutton is set ON, an audible

tone will sound each time a GO reading is detected.

Measurement Principles

The test current flows through the resistance from the FORCE+ (F+) terminal to the

FORCE- (F-) terminal. The S+ and S- (SENSE) terminals measure the voltage drop across

the device under test only, thus eliminating the lead and contact resistances. The meter

displays the resistance based on the test current and the measured voltage; refer to the

equation below:

Rx = Vx / Is

Where:

Vx is the voltage drop across the device under test;

Is is the test current;

Rx is the resistance of the device under test.

Calibration and Repair Services

Extech offers complete repair and calibration services for all of the products we sell.

For periodic calibration, NIST certification on most products or repair of any Extech

product, call customer service for details on services available. Extech recommends that

calibration be performed on an annual basis to ensure calibration integrity.

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