Low resistance digital ohmmeter
March 2013
Electrical Power & Protection
Megger’s DLRO200-115 ohmmeter checks and measures contact resistance in high voltage circuit breakers, disconnecting switches (isolators), busbar joints and other low resistance applications. The test set accurately measures resistances ranging from 0,1 μohm to 1 ohm at high currents.
It is a versatile instrument that can provide test currents from 10 to 200 amps, subject to the load resistance and supply voltage. For applications that demand a smooth DC current, the DLRO200-115 has extra filtering on the output to reduce mains frequency ripple. It can drive 200 amps through a total current loop resistance of 11 milliohms. The filtered output also eliminates magnetic transients that could inductively trip a breaker’s control (bus differential relay) if left in the test circuit.
The unique design allows the weight and size of the Megger DLRO200-115 to be kept to a minimum; the instrument weighs less than 15 kg. This, together with a water/dust ingress rating of IP54, makes the test set equally applicable in the workshop, on the production floor or in the field.
Three hundred sets of results can be stored in the on-board memory for later download to a PC or output directly to a printer via the RS232 port. The user may also add notes to any stored result by using the on-board alphanumeric keypad, thereby making later identification of results easier to determine.
For more information contact Stuart Ashton, Surgetek, +27 (0)11 792 1303, [email protected], www.surgetek.co.za
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