T&R DMO200 Digital Micro-Ohmmeter

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 is a high current micro-ohmmeter designed for the measurement of very low resistances. Resistances down to 0.1µΩ can be measured at 200A and up to 5Ω at 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 unit has an easy to read liquid crystal display that shows all values (A, V and Ω) and programmable buttons to store 3 custom test currents (set to 50A, 100A and 200A by default).The DMO200 must only be used on ‘dead’ systems (i.e. no externally supplied voltages are present on the test object. Do not connect the DMO200 to a live system. Always check that the device under test is isolated and earthed on at least one side before making any connections. The DMO200 may be used with an optional DC current clamp to accurately measure resistances where there is an alternative current path in parallel with the main current path (e.g. testing circuit breaker contact resistances with both sides of the circuit breaker earthed). FEATURES 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 Main Output Maximum output voltage 5.0 V dc. Full load output voltage 5.0 V dc. Output current 100A continuous 200A 15 min on/15 min off. Output ripple <2.5%. Sense voltage input Maximum measurement voltage 5 V dc. Range Resolution Accuracy 0 - 9.999 mV. 0.001 mV. +0.5% of reading +5 digits. 10.00 - 99.99 mV. 0.01 mV. +0.5% of reading +5 digits. 100.0 - 999.9 mV. 0.1 mV. +0.5% of reading +5 digits. 1.000 - 5.000 V. 0.001 V. +0.5% of reading +5 digits. Environment Supply requirements 90 - 264 V ac single phase 1300 VA maximum. Maximum altitude 2000 m. Operating temperature 0°C to 45° C. Storage temperature -20°C to 60° C. Protection rating IP40 lid closed IP30 in use. Dimensions 360 x 290 x 165 mm. Weight 6.9 kg. T&R DMO200 warranty 1 year.

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