EXTECH 380560 High Resolution Benchtop MilliOhm Meter User Manual
- June 12, 2024
- EXTECH
Table of Contents
EXTECH 380560 High Resolution Benchtop MilliOhm Meter
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.
Meter Description
- LED Display
- HI/LO/GO Status Indicators
- Power and Range pushbuttons
- Kelvin clip leads
- SET/TEST and HI/LO pushbuttons
- Comparator adjustment screws
- 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
- Connect the Kelvin test leads to the meter.
- Press the POWER pushbutton to turn power on.
- Position the SET/TEST pushbutton to the TEST position.
- To check the meter zero, clip the test leads together as shown at right.
- 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.
- Clip the leads onto the device under test as shown below.
- Observe the reading on the LED display.
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:
- Position the SET/TEST pushbutton to SET.
- Position the LO/HI pushbutton to LO.
- Adjust the LO comparator screw to the desired low limit (shown on the LED display).
- Position the LO/HI pushbutton to HI.
- Adjust the HI comparator screw to the desired high limit.
- Position the SET/TEST pushbutton to TEST.
- 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 DC test current flows through the resistance from the FORCE+ (F+) terminal
to the FORCE- (F-) terminal. The S+ and S- (SENSE) terminals measure the DC
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.
Specifications
General Specifications
| Circuit | Custom one-chip LSI microprocessor circuit |
|---|---|
| Display | 20 mm (0.8″) 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 |
| Measurement speed | Resistance 1 second, comparator mode 0.5 seconds |
| Zero adjust | Automatic (no adjustment necessary) |
| Over-range indication | Display reads “1 __ ” when the reading is out of range |
| Operating Temperature | 0°C to 50°C (32°F to 122°F) |
| Operating Humidity | Max. 80% RH |
| Power Supply | 110V (380560) or 220V (380562) ±15%, 50/60Hz |
| Weight | 2.2kg (4.85 lbs) |
| Dimensions | 280 x 210 x 90mm (11 x 8.3 x 3.5″) |
| Replacement Kelvin leads | 380465 |
Range Specifications
Range| Resolution| Test Current| Accuracy (%rdg)| Test
Voltage
---|---|---|---|---
20 mW| 0.01mW| 1A| ± (0.2% + 6 digits)| 2.7V DC
200 mW| 0.1mW| 1A| ****
± (0.2% + 4 digits)
| 3.3V DC
2 W| .001W| 0.1A| 3.5V DC
20 W| .01W| 10mA| 4.1V DC
200 W| 0.1 W| 1mA| ****
4.5V DC
2K W| .001kW| 0.1mA
20K W| .01kW| 10uA
Note: Specifications based on RF Field Strength <3V/m and frequency <30MHz
International Symbols
Two-year Warranty
FLIR Systems Inc.warrants this Extech brand instrument to be free of defects in parts and workmanship for two years from date of shipment (a six-month limited warranty applies to sensors and cables). To view the full warranty text please visit: http://www.extech.com/support/warranties
Calibration and Repair Services
FLIR Systems Inc.offers calibration and repair services for the Extech
brand products we sell. We offer NIST traceable calibration for most of our
products. Contact us for information on calibration and repair availability,
refer to the contact information below. Annual calibrations should be
performed to verify meter performance and accuracy. Product specifications are
subject to change without notice. Please visit our website for the most up-to-
date product information: www.extech.com
Contact Customer Support
Customer Support Telephone List: https://support.flir.com/contact
Calibration, Repair, and Returns:
repair@extech.com
Technical Support: https://support.flir.com
Copyright © 2022 FLIR Systems Inc.
All rights reserved including the right of reproduction in whole or in part in
any form www.extech.com
References
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