Publication No. 980978 Rev. A 203M User Manual
Astronics Test Systems Operation 2-3
MV/g Output Switch
This switch sets the normalized sensitivity at the ACCEL OUTPUT. Either 10
mV/g or 100 mV/g can be selected. This switch setting does not affect the
sensitivity at the displacement output.
LP FILTER Switch
The Low Pass Filter (LP FILTER) switch has three positions marked LOW, MED,
and HIGH. Nominal frequency cutoffs of 3, 10, or 30 kHz are selected. The
cutoffs can be altered if different cutoffs are more appropriate.
HOLD Circuit
The HOLD circuit has a center OFF switch with a momentary READ and ERASE
position. The HOLD circuit stores the highest TRMS value encountered during a
test, and this value can be displayed on the meter by depressing the momentary
READ position of the switch. The HOLD circuit can be restored to zero by
depressing the switch to momentary ERASE.
ALARM Circuit
The ALARM circuit has a SET switch, a light, and a SET ADJ control associated
with it. When the SET switch (momentary) is depressed, the SET ADJUST is
connected to the meter to indicate what level the alarm is set for. While the
switch is depressed, the alarm levels can be changed by varying the screwdriver
adjustment and noting the new value on the front panel meter. When released,
the alarm is reset, the light is out, and it will remain thus until a level is
encountered which is higher than the ALARM SET level. When this level is
encountered, the ALARM light will illuminate and the alarm relay will be
energized. The contacts of the alarm relay are on a terminal strip on the rear
panel. It should be noted that the alarm level is interconnected through the
METER RANGE switch. For instance, if 8 g’s is set on the 10 g’s range, it will
become 80 g’s if the 100 g range is selected.
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