Instruction Manual

7. Preparation
7-1 Connection of Test Leads
Connect the test lead properly.
●
Connect the test lead M7128; red cord to the load of the Connector
block and black cord to the power supply.
●
When using the test lead with Alligator clip, connect the test lead
M7128 (red) to the load of Connector block and M7129 to the power.
7-2 Setting of Measurement Range
Turn the Function Switch and power on the instrument, then select any
appropriate Ranges.
Range construction: There are 4 Ranges on this instrument.
x 5 For trip time measurement :
Apply a current 5 times bigger than IΔn to measure
RCD trip time.
x 1 For trip time measurement :
Apply IΔn to measure RCD trip time.
x 1/2 For the test - rated residual non-operating current :
Apply a half of IΔn to confirm the RCD under test
doesn’t trip.
AUTO RAMP For trip out current measurement :
Vary a testing current in the range of 40% ~ 110% of
IΔn to measure the trip out current on the RCD.
WARNING
Do not power on the instrument with it being connected to the live
circuit.
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