Publication No. 980978 Rev. A 203M User Manual
Astronics Test Systems Operation 2-1
Chapter 2
Operation
The 203M Charge Amplifier is in a modular package with a self-contained power
supply. Insert the amplifier into one of the six rack spaces of a six-module rack
or the single-module cabinet. Connect the AC line into either 115 Volts or 220
Volts RMS, 60 Hz power. A switch (S1) mounted on the circuit board of each
module selects either 110 or 220 Volts operation. Operation with this switch set
for 110 Volts when using 220 Volt power will damage the unit. The power to the
six modules is controlled by the POWER switch on the left-hand side of the rack;
place this switch to POWER.
CAUTION
The 115-230 VAC switch (S1) must be at the proper setting.
If 230 V Power is applied when this switch is set for
115 V RMS, circuitry will be damaged.
Input Switch
The Charge amplifier is designed to accept inputs from either standard charge
type pickups or from the type with the electronics built it. Place the INPUT switch
to pC/g for standard charge type pickups and to mV/g for the other. When this
switch is in the mV/g position, a current output is supplied to operate the pickup
electronics. This will be set for 3-5 milliamps when shipped. Connect the pickup
to the ACCEL INPUT jack (BNC connector), at the rear of the rack.
Digital Panel Meter
The DPM is a 3-1/2 digit meter that monitors the input level. It has three ranges:
10, 100, or 1000 units, and a switch to select either Acceleration g’s, Velocity
IPS, or Displacement MILS.
Units Switch
The UNITS switch selects g’s, IPS, or MILS as the UNITS to be displayed on the
front panel meter and at the DC OUTPUT jack.
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