T&R DMO200 Digital Micro-Ohmmeter

T&R Test Equipment

T&R Approved distributor and service company.

The T&R DMO200 has programmable buttons to set test currents. Set to 50A, 100A and 200A by default.

More details



Delivery TBC

£ 4,370.00 rrp £ 4,600.00

save 5%

(£ 5,244.00 inc VAT.)

Add to wishlist

The T&R DMO200 is a high current micro-ohmmeter suitable for measuring very low resistances in a wide range of applications. The unit is equally suited to commissioning, maintenance, and production line environments. Contact resistances in circuit breakers, switch panels, isolators, and busbar joints are all easily and safely measured.

Resistances down to 0.1 can be measured at 200A and up to 5at 1A. The DMO200 has pre-settable output current and electronic current control.

Resistance is measured using the four wire method to remove the effect of the lead resistances. Current is injected using a pair of high current leads and the voltage drop across the resistance to be measured is picked up with sense connections. In addition, an optional current clamp may be connected to monitor any current lost to parallel connection paths (such as the earth current when testing large circuit breakers with safety earths connected to both sides of the breaker).

The DMO200 also has data storage facilities using a USB memory key, and comments can be entered to be stored with the results using a USB keyboard.

The DMO200 is simple to operate, only requiring the user to select the test current and switch the output on. The unit has presettable test current with three buttons to store commonly used test currents.


Ultra lightweight (6.9kg).
1-200Adc test current with <2.5% ripple.
0.1μΩ resolution.
mV, A, and m/μΩ displayed simultaneously.
USB memory key for data storage.
USB keyboard for comment entry.
Pre-settable test current with three buttons to store user test currents.
Large back-lit liquid crystal display.
Universal supply voltage 90-264V.
Supplied with 3m output lead set.
Optional current clamp to allows testing of objects with both sides earthed.

T&R DMO200 Specifications:

  • Maximum output current: 100A continuous, 200A 15 min on/15 min off.
  • Supply voltage: 90-264Vac.
  • Test Current Range: 1-200A d.c.
  • Resistance measurement: 0.1μΩ-5Ω
  • Custom preset currents: 3 fully adjustable preset test currents. Set to 50A, 100A and 200A by default.
  • Dual Earth: Yes with current clamp.
  • Results storage: All test results can be stored automatically on a standard USB memory key.
  • Dimensions: 360 x 290 x 165mm.
  • Weight: 6.9kg.
  • T&R DMO200 Warranty: One year.


Includes: 3m 35mm2 output cables, 3m sense leads, Mains lead, T&R DMO 200 User manual, USB keyboard, 2GB USB memory key and Lead case.

Weight 6.9kg
Calibration Certificate No
Test Current 200A

Write a review

T&R DMO200 Digital Micro-Ohmmeter