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The Megger
DLRO200-115 measures contact resistance in high voltage circuit breakers,
disconnecting switches (isolators), busbar joints, or for any other low
resistance measurement. This test set accurately measures resistances ranging
from 0.1µΩ to 1Ω, at high currents. A versatile instrument, it can provide test
currents from 10 amps up to 200 amps, subject to the load resistance and supply
voltage. For those applications that demand a smooth dc current, the DLRO200-115
has extra filtering on the output to reduce mains frequency ripple and can drive
200 amps through a total current loop resistance of 11 milliohms. The filtered
output of the DLRO200-115 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 DLRO200-115 to
be kept to a minimum; the instrument weighs less than 32 lbs. (15 kg). This
small size plus a water/dust ingress rating of IP54 makes the test set equally
at home in the workshop, on the production floor or in the field.
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