Extech UM200 Operating Manual
Micro-Ohmmeter
Model UM200
User Manual
AdditionalUserManualTranslationsavailableatwww.extech.com
Introduction
Thank you for selecting the Extech Model UM200. This device is shipped fully tested and calibrated
and, with proper use, will provide years of reliable service. This device is shipped fully tested and
calibrated and, with proper use, will provide years of reliable service. Please visit our website
(www.extech.com) to check for the latest version and translations of this User Manual, Product
Updates, Product Registration, and Customer Support.
Warning
Do not use the ohmmeter before you read the following instructions.
Do Not Plug in the AC adapter when the ambient temperature exceeds 45°C / 113°F.
Do Not charge the lithium battery when the ambient temperature exceeds 45°C / 113°F.
Do not attempt to connect to or measure any resistance (object) with voltage present.
Electrical potential (voltage) could cause damage to the ohmmeter.
Do not use the lithium battery to power anything but this instrument.
Do not soak or immerge the lithium battery in any liquid.
The lithium battery may explode if disposed of in Fire.
Recycled or disposed of the battery as directed by local regulations.
Do not expose the lithium battery to temperature higher than 60°C or 140°F.
Do not disassemble the lithium battery assembly.
Do not short circuit the lithium battery
Do not touch the battery if it is damaged.
Features
High 1μΩ resolution with a basic accuracy of 0.25%.
10A maximum test current.
Measurement of resistive and inductive materials.
Four terminal Kelvin measurement.
Manual or Auto Range. (There are 6 ranges of current measurement and 3 sub-ranges in
each current range.)
Programmable Hi-Lo alarm with memory of 20 sets of limits.
Hold function.
Cable length measurement (Feet or Meter).
Memory of 3,000 measurement data.
Large LCD (5-digit) with backlight.
Rechargeable lithium battery (3400mAH) and built-in charging circuit.
Low battery indication.
Low power consumption.
PC interface & software.
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Meter Description
Front Panel
1. LCD: 6000 count LCD with Backlight.
2. ▲ button: In SETUP mode, press the ▲ button to increment value by 1. Press and hold the ▲
button for over 2 seconds to increment value swiftly. In Recall mode, press the ▲ button to
display the next stored data location.
3. SELECT button: In SETUP mode press the SELECT button to select HI (Limit) or LO (Limit)
or display cable resistance per foot or meter
4. ▼ button: In SETUP mode, press the ▼ button to decrement value by 1. Press and hold the
▼ button for over 2 seconds to decrement value swiftly. In Recall mode, press the ▼ button to
display the previously stored data data location)
5. ZERO / RECALL button: In resistance mode, zero the range before making measurements.
Press the ZERO / RECALL button to enter Relative mode (the present readings will be reset to
zero), or press the ZERO / RECALL button for over 2 seconds to exit the Relative mode. In
SETUP mode, use this button to recall the pre-stored sets of HI limits, LO limits and resistance
per unit.
6. START / STOP button: In resistance mode, press the START / STOP button to start
measurement. Press the START / STOP button again to stop and hold the reading.
7. REC / READ button: In measurement mode, press the REC / READ button to display the
number of the present recorded data and have the present reading recorded. In SETUP mode,
press the REC / READ button to enter READ data mode. Press it again to exit READ data
mode. In the READ mode, users can recall data stored by pressing the ▲ or ▼ button.
8. FEET / METERS button: In cable length mode, press the FEET / METERS button to select
units of Meter (M) or Feet (FT).
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9. LED: If the light is on, measurements are for both inductive and resistive materials. If
the light is off, measurements are for resistive materials only.
10. Power error LED: If the light is on, measurement errors may be caused by one of the
following reasons:
Low battery voltage
Blown fuse
Measuring a device with electrical potential (voltage).
(Note: the electrical potential (voltage) could cause damage to the meter.)
11. Output error LED: If the light is on, measurement errors may be caused by one of the
following reasons:
Test leads or the measured cable is not properly connected.
Resistance is too high (higher than the measurement range)
Output current is less than needed for the load.
12. Rotary Switch: The Switch provides selections of: OFF, 6 measurement ranges (6000Ω,
600Ω, 60Ω, 6Ω, 600mΩ and 60mΩ) and SETUP.
button: Press this button to enable/disable the backlight.
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16. Range x10 button: In each rotary switch position, three sub-range can be selected by
17. Ω / LENGTH button: Press Ω / LENGTH button to select measurement mode or length mode.
button: (for 600mΩ (1A) and 60mΩ (10A) ranges) Press to measure inductive
materials when the
button: Press the Beep button to turn on/off the alarm function (HI and LO). When the
alarm function is enabled, the
the HI-LO range, a “PASS” will be displayed. If the value of resistance is out of HI-LO range,
the beeper will sound. But if the value of resistance is out of the measuring range (LCD
displays “OL”), the alarm function is disabled.
pressing this button. Press the Range x10 button for over 2 seconds to return to Auto Range.
In the auto range, a symbol of AUTO will be displayed in LCD.
In the SETUP mode, press this button to move the decimal point of a number.
Press Ω / LENGTH button for over 2 seconds to store the present value of resistance as the
resistance per foot or meter.
LED is off.
icon will be shown in LCD. If the value of resistance is within
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