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VOLTAGE MONITOR
voltmeter. The switch selects full scale indicat-
ions 3, 10, and 30 V RMS.
A BNC socket provides an oscilloscope display
of voltage waveform, including the DC com-
ponent. The output is short-circuit protected
by an internal 1
oon
resistor for short term
fau Its.
Six front panel indicators have also been provided. Four red lamps to
indicate input cut-off conditions and two yellow lamps each indicating an
abnormal situation, but that operation can continue at the operator's dis-
cretion.
TEMPERATURE
DISPLACEMENT
CURRENT
EXCITER
CLIPPING
A red lamp which indicates the firing of the
trigger circuit due to excessive transistor
junction temperature.
A red lamp which indicates the firing of the
trigger circuit due to excessive shaker table
displacement.
A red lamp which indicates the firing of the
trigger circuit due to excessive moving coil
current over the selected averaging time (see
section 3.4).
A red lamp which indicates that blocking of
the input gates has occurred because the
Exciter Body over-temperature circuit indi-
cates trouble, the Exciter Head/Body are
separated or an Exciter Body fuse has blown.
An external trigger can be given using the
ACCESSORY
socket.
If
the
EXCITER
INTERLOCK switch is in the "Bypass" posit-
ion, Exciter protection is removed and the
EXCITER lamp will not light.
An amber lamp which indicates excessive volt-
age output with voltage clipping in the output
transistor stage or current clipping in the peak
9
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