Extech 380580 Operating Manual
User’s Guide
Model 380580
Battery Powered
Milliohm Meter
Introduction
Congratulations on your purchase of Extech’s Model 380580 Battery Powered Milliohm
Meter. This device offers five resistance ranges with resolution as low as 0.1mΩ. The 4-wire
Kelvin clip connection ensures optimum accuracy. Typical applications include transformer,
motor coil, and PC Board resistance measurements. This professional meter, with proper
care, will provide years of safe reliable service.
Specifications
General Specifications
Display 1.0" (25 mm) LCD (1999 counts)
Measurement terminals 4-Terminal Kelvin type
Measurement Range Five ranges (see listing below)
Sampling Time Approximately 3 times per second
Over input indication Indication of "1 - - -"
Operating Temperature 5ºF to 131ºF (-15ºC to 55ºC)
Operating Humidity <80% RH
Power Supply 8 x 1.5V AA Batteries
Weight 3.3 lbs (1.5kg)
Dimensions 9.8x7.5x4.3" (250x190x110 mm) with cover
Range Specifications
Range
200.0mΩ 0.1mΩ
2000mΩ 1mΩ
20.00Ω 0.01Ω
200.0Ω 0.1Ω
2000Ω 1Ω
International Symbols
This symbol, adjacent to another symbol or terminal, indicates the user must
refer to the manual for further information.
This symbol, adjacent to a terminal, indicates that, under normal use,
hazardous voltages may be present
Double insulation
Resolution
Test
Current
100mA ± 0.5% + 2 digits 4.2V
100mA ± 0.5% + 2 digits 4.2V
10mA ± 0.5% + 2 digits 4.2V
10mA ± 0.5% + 2 digits 4.3V
1mA ± 0.5% + 2 digits 4.4V
Accuracy
Open Circuit
Voltage
2
Version 2.0 1/05
Meter Description
1. Current Terminals
2. Potential Measurement Terminals
3. LCD Display
4. Start/Stop Test Button
5. Range Select/Power Switch
6. LED Error Lights
• No Test/Over Temperature
• R
Voltage Regulation
P
• R
Current Regulation
C
7. Current/Range Table
Leads
Current Leads- Banana plug to alligator clip
C1- Green
C2- Blue
Voltage Potential Leads- Banana plug to alligator clip
P1- Red
P2- Black
Kelvin Clips- Banana Plugs (2) to Kelvin Clip
Red (P1) Green (C1)
Black (P2) and Blue (C2)
Measurement Considerations
1. Do not apply voltage to the meter input terminals. Meter damage may result.
2. Always insure that the circuit to be measured is switched OFF, isolated and
completely de-energized before connecting the test leads.
3. If the Over Temperature LED (NO TEST) indicator is lit, allow the instrument to
cool down before proceeding further.
4. The R
5. The R
6. If either the R
7. The current terminals are fuse protected.
8. Keep the potential test leads as short as possible. Long leads may introduce noise.
9. When using the four separate alligator clip leads always place the current leads
led indicates when the test current falls out of regulation. Selecting a higher
C
range may eliminate the condition.
led indicates when the voltage on the device under test is too high.
P
Selecting a lower range may eliminate the condition.
or RP led is on, the measurement may be in error.
C
outside the potential leads.
3
Version 2.0 1/05
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