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• Phase Selection: Can select positive (0°) or negative (180°) to initiate a
test.
• Over-range display "OL" indication. "OL mS" signal will be displayed on
LCD if the testing goes over the time limitation for the test.
• Fast Trip Fixed: Current 250mA (MAX: 40mS) (KMP7020 only).
• AUTO RAMP Test: AUTO RAMP can test the trip test current.
(KMP7021 only).
• Power Off Buzzer: Buzzer will sound when the Tester is in idle for 3
minutes
• Fuse: Protected by fast blowing fuse to protect the instrument.
OPERATION
Before Making Measurement
WARNING
�
• Check voltage between the protective conductor and earth, a possible
voltage will influence the measurements.
• Test the connection between the neutral point of the distribution
system and earth before the test is started; a possible voltage between
the N-conductor and the earth may influence the measurements.
• Leakage currents in the circuit following the residual current protection
device may influence the measurements.
• The earth electrode resistance of a measuring circuit with a probe shall
not exceed 5 Ohm.
• The potential fields of other earthing installations may influence the
measurement.
• Special conditions in residual current protective devices of a particular
design, for example of S-type (selective and resistance to impulse
currents) shall be taken into consideration.
• Equipment, which is connected downstream of a residual current
protective device (RCD) may cause a considerable extension of the
operating time. Examples of such equipment might be connected
capacitors or running motors.
5
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