The PULSE DURATION MENU allows the user to program the number
of
cycles
that the output
of
the test set will be energized during a momentary pulse. The
number
of
cycles can be increased
or
decreased by pressing the soft keys directly
beneath UP
or
DOWN. Pressing the soft key beneath EXIT will return the user to
the previous menu. The default pulse duration setting is 5 cycles.
The
FIRING ANGLE MENU allows the user to program the initial firing angle at
which the output signal
of
the test set is energized. This is important when dealing
with asymmetrical waveforms. The more inductive the test specimen, the more
asymmetrical the output
of
the test set will be due to DC offset. Asymmetry
in
the
output
of
the test set has become
of
increased importance when performing
instantaneous trip tests on circuit breakers. By providing the ability to adjust the
firing angle
of
the test set, the user can minimize the effect
of
DC offset and
therefore collect more accurate information with regard to the instantaneous
characteristics
of
the test specimen. See ACQUISITION CONTROL MENU for
information on how to determine
if
the output
of
the test set is symmetrical and how
to adjust the firing angle if it is not. The default firing angle is
70
0
.
F.
ACQUISITION CONTROL MENU
12
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