Publication No. 980978 Rev. A 203M User Manual
Astronics Test Systems Introduction 1-1
Chapter 1
Introduction
The 203M Charge Amplifier (Figure 1-1) is a versatile charge amplifier covering
the frequency range from 5 Hz to 30,000 Hz. It will accommodate sensors with
sensitivities varying from 1 to 110 pC/g or mV/g and provides an output of either
10 mV/g or 100 mV/g with selectable Peak or RMS indication.
A double integration process provides velocity and displacement outputs. A CAL-
OPER switch connects the charge amplifier input to either the calibrate signal or to
the normal input.
Three standard low pass filters with cutoff frequencies of 3, 10, or 30 kHz, other
cutoffs can be supplied at the time of order.
The unit will operate with high temperature accelerometers where pyroelectric
effects may be encountered and will function with 1 MegOhm or greater shunt
input resistance. The unit has an alarm circuit to alert if preset levels are
exceeded and a relay contact closure is provided.
The Charge Amplifiers are packaged in a plug-in module. Up to six modules will
plug into a standard 19-inch cabinet space, seven inches high, or in a single
module cabinet.
Features include:
• pC/g or mV/g
• Accel, Vel, Displ
• 1 to 110 pC or mVg
• DVM Indictor
• Alarm
• Level Hold
• Built-in Calibrator
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