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User Manual
High Resolution Benchtop MilliOhm Meter
Models 380560 and 380562
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Introduction
1
5 6 7
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 l ow 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
2
3
4
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.
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F+
F-
F+
F+
F+
F+
F+
F+
F+
F+
S+
F-
F-
F-
F-
F-
F-
F-
F-
F-
S-
S+
S+
S+
S+
S+
S+
S+
S+
S+
Current
V
Current
Current
Current
Current
Current
Current
Current
Current
Current
o
Current
Current
Current
Current
Current
Current
Current
Current
Current
lts
Current
Current
Current
Current
Current
Current
Current
Current
Current
o ts
F+
S+
F-
S-
White Bands
Measurement Procedure
Rx
F + S+ S - F -
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.
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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
Resolution
Test Current
Accuracy (%rdg)
Test Voltage
20 mΩ
0.01mΩ
1A
± (0.2% + 6 digits)
2.7V DC
200 mΩ
0.1mΩ
1A
3.3V DC
2 Ω
.001Ω
0.1A
3.5V DC
20 Ω
.01Ω
10mA
4.1V DC
200 Ω
0.1 Ω
1mA
2K Ω
.001kΩ
0.1mA
20K Ω
.01kΩ
10uA
General Specifications
Range Specifications
± (0.2% + 4 digits)
Note: Specifications based on RF Field Strength <3V/m and frequency <30MHz
International Symbols
4.5V DC
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