Extech Instruments 380560 Manual de usuario

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User Manual

High Resolution Benchtop MilliOhm Meter

Models 380560 and 380562

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380560-en-GB_V1.9 2/17

2

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

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.

1

2

3

4

5 6 7

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380560-en-GB_V1.9 2/17

3

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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.

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.

Rx

F + S+ S -F -

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380560-en-GB_V1.9 2/17

4

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 mΩ

0.01mΩ

1A

± (0.2% + 6 digits)

2.7V DC

200 mΩ

0.1mΩ

1A

± (0.2% + 4 digits)

3.3V DC

2 Ω

.001Ω

0.1A

3.5V DC

20 Ω

.01Ω

10mA

4.1V DC

200 Ω

0.1 Ω

1mA

4.5V DC

2K Ω

.001kΩ

0.1mA

20K Ω

.01kΩ

10uA

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

International Symbols

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