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Example Applications
Busbar joint resistance
The DMO200 is ideal for measuring busbar joint resistance.
Before making connections ensure that the supply is off and
necessary earths have been applied. Connect the high current leads
to the busbar, ensuring that the joint resistance to be measured is
in the circuit. Connect the sense leads as close as possible to the
joint to be measured. Select the desired test current using one of
the preset test currents (or use the adjust knob to set a custom test
current). Switch the output on, and the current rises to the preset
current. Switch the output off again, and the reading is held on the
display.
Circuit breaker contact resistance
The DMO200 is suited to all low resistance measurements on power
systems, and is particularly suited to measuring contact resistances
on substation circuit breakers, isolators and grounding equipment.
The unit has a powerful output capable of driving 200A through 20m
output leads to reach the contacts of even the largest circuit
breakers. Optional output lead extensions are available which
extend the high current and sense leads by 3, 5 or 10m.
Accurate measurements on circuit breakers, isolators and grounding
links with both sides earthed are simple with the optional current
clamp. This allows the current flowing through the earthing
equipment to be subtracted from the test current.