Publication No. 980978 Rev. A 203M User Manual
Astronics Test Systems Introduction 1-3
The charge sensitivity control is continuously variable from 1 to 11 with an
additional X10 Switch to allow operating with pickups having sensitivities from 1 to
110 mV or pC/g.
A toggle switch permits selection of either 10 mV/g or 100 mV/g output sensitivity.
A CAL-OPER switch connects the charge amplifier input to either internal
calibrator signal or to the normal input.
A front panel filter switch selects three low pass filter cutoff frequencies of 3, 10,
or 30 kHz marked LOW, MEDIUM, or HIGH.
The unit will operate with high temperature accelerometers where pyroelectric
effects may be encountered. It will function with 1 MegOhm or great shunt input
resistance.
The unit has an alarm circuit to alert if preset levels are exceeded. The Charge
Amplifiers are packaged in a plug-in module. Up to six modules will plug into a
standard 19-inch rack space, seven inches high.
System Specifications
Input
Connector BNC.
Charge Sensitivity 1 to 110 mV or pC/g (provided with two
selectable ranges), 1-11 and 10-110 mV or
pC/g with continuous adjustment for each.
Frequency Response
±3% from 5 Hz to 30,000 Hz referred to 100
Hz.
Overload Recovery
10.000 pC or less, 1 ms half sine input
pulse will cause no effect at the output,
except clipping.
Amplitude
(Stability vs. Input capacity)
Less than 0.1% change per 1000 pF.
Amplitude
(Stability Temperature)
Less than 3% change from 30˚ to 130˚F.
Shunt Resistance
Will operate with any input impedance
above 100k Ohms.
Filtering
12dB per octave roll off with 3dB cutoffs
selectable for 3 kHz, 10 kHz, and 30kHz.
(Other cutoff frequency supplied on
request)
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