Multifunction Electrical Tester Calibrator
Use the RCD Test Functions
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To change the current multiplier:
1. Push the I Mult softkey.
2. Push the I Mult softkey for the desired current multiplier value and either
push the Select softkey or push in the rotary knob. Available multipliers are
0.5, 1, 1.4, 2, and 5.
0.5 – This setting is used for Installation testers that test non-tripping RCDs.
When this value is set, the Product measures DUT trip current for 5 seconds
and then disconnects the output terminals. If the DUT current exceeds the set
nominal trip current or is greater than 4000 mA, the Product disconnects the
output connectors and displays a Trip current too high error message.
Some DUTs generate prepulses before tripping pulses. When the 0.5 I
Multiplier constant is setup in the DUT, the amplitude of the prepulse is
approximately the same level as the tripping pulse. The Product can
recognize and ignore the prepulse when the setup trip time is higher than two
periods of the line frequency wave. Practically, when supplied from 50 Hz
mains, the prepulse is ignored when trip time is set in the Product to 40 ms or
higher. If the trip time is <40 ms , the Product cannot recognize the first pulse
as a prepulse and trips.
1 – This setting is the most common for Installation testers. Depending on the
I level parameter, the Product may or may not ignore any pretest pulses
generated by the DUT which are below the value determined by I level and
nominal trip current settings. Pretest pulses are ignored if their level is below
the pretest I level value. If the pretest pulses are higher than the I level
parameter, the Product reads them as real (actual) trip current pulses.
1.4 and 2 – These settings are used for testing DUTs that measure current
overload. The Product and DUT current multipliers should be set to the same
value when calibrating using this setting. These settings multiply the nominal
trip current setting by 1.4 or 2 and uses it as the trip point. If the trip current
exceeds 300 % of the nominal current setting or 3000 mA, the output
terminals are disconnected and a Trip current too high error message
displayed. The maximum nominal trip current that can be used with this
setting is 1500 mA.
5 – This setting multiplies the nominal trip current by 5 and uses that value as
the trip current value. If the trip current exceeds 750 % of the nominal trip
current setting or 3000 mA, the output terminals are disconnected and a Trip
current too high error message is displayed. The maximum nominal trip
current that can be used with this setting is 600 mA.
Note
Multiplier values of 2 and 5 are for testing of fast tripping RCDs.
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