203M User Manual Publication No. 980978 Rev. A
Calibration Procedure 4-2 Astronics Test Systems
Charge Converter and Displacement Adjust
1. Set the Dial to 10.0
2. Place the SENSITIVITY Switch to 10-110 and the CALIB-OPER switch to
OPER.
3. Connect the AC Voltmeter to Pin 8 of P1 (ACCEL OUTPUT of the Test Board).
4. Connect a 61.4 ±0.1 Hz signal to the ACCEL INPUT jack on the Test Board
and set it for 7.07 ±0.04 Volts RMS.
5. Set the ACCEL ADJ R8 for a 707 ±4 millivolts RMS indication on the AC
Voltmeter.
6. Set the Dial for 1.0.
7. Set the DIAL ADJ R1 for a 7.07 ±0.04 Volts RMS indication on the AC
voltmeter.
8. Connect the AC voltmeter to Pin 10 of P1 (VEL OUTPUT of the Connector
Board Assembly).
9. Set the VEL FS ADJ R7 for a 7.07 ±0.07 Volt RMS indication on the AC
Voltmeter.
10. Connect the AC Voltmeter to the DISPL OUTPUT, Pin 11 of P1 of the Test
Board, and set the input frequency for 139.9 ±0.3 Hz.
11. Set the DISPL FS ADJ R4 for a 7.07 ±0.07 Volt RMS indication on the AC
Voltmeter.
DVM Adjustments
1. Place the SENSITIVITY Switch to 1-11, the Dial to 10.0, the CALIB-OER
switch to OPER.
2. Connect the DC Voltmeter to Pin 13 of P1, DC OUTPUT of the Test Board.
3. Connect a 7.07 ±0.04 Volt signal of 139.9 ±0.5 Hz to Pin 17 of P1, the ACCEL
INPUT of the Test Board.
4. Observe a 10.00 ±0.05 Volt indication on the DC Voltmeter.
5. Set the DVM FS AJ R1 (Figure 4-2) on the front panel meter assembly for a
1000 ±8 counts on the front panel meter. (Adjust the resistor through the hole
on front panel board.)
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