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Ramp test
The KT63DL also includes a diagnostic Ramp test feature. In this mode rather than applying a
steady fault current and measuring the time taken for the RCD to trip, the KT63DL gradually
increases the fault current and identifies the level of additional leakage at which the RCD trips.
This is particularly useful in diagnostic testing of circuits where nuisance tripping is a problem
and helps to identify the difference between an over sensitive RCD and excessive leakage
from poor insulation or equipment with high leakage.
Sinusoidal polarity (the 0° or 180° test)
RCD’s often operate with different reaction times depending upon whether the fault is
introduced during the positive or negative half cycle of the AC waveform. Therefore to
accurately determine the maximum response time of an RCD it is necessary to test it twice
at each given fault current, firstly with the fault introduced during the positive half cycle and
secondly during the negative half cycle.
The KT63DL takes care of this for you by alternating the start point of consecutive tests at
any given setting. If for example you have selected a test at the rated trip current (x1) of a
100mA RCD, the first press of the test button will apply a 100mA fault current starting on
the positive half cycle (0°) and display the result. A further press of the test button
will carry out another test at the same current but starting on the negative half cycle
(180°).
Test leads
Where testing is to be conducted at a point on the circuit other than a socket outlet the
distribution board test lead set ACC063 is used in 3-wire mode as described in the previous
chapter. The probes can be fitted with either prod tips or crocodile clips as required.
Mains supply wiring and voltage test
When first connected to a mains supply the KT63DL will automatically conduct a safety test to
ensure that the Live, Neutral / Earth conductors are correctly connected and that the supply
voltage is in the acceptable range of 207-253V.
If all is well the VOLTAGE/POLARITY warning LED will light Green and the supply voltage will be
displayed in the primary display area.
In the event of a problem with either the mains voltage supply or reversed connections the
VOLTAGE/POLARITY warning LED will light Red, a warning tone will be sounded and testing will
be inhibited.
