Publication No. 980978 Rev. A 203M User Manual
Astronics Test Systems Performance Test 3-3
20. When the ALARM SET switch is released, the ALARM LIGHT will
illuminate and the ALARM RELAY will energize. (Rear panel terminal
strip).
21. Depress the ALARM SET switch and set the alarm level for 105 g’s.
22. Release the ALARM SET switch; and ALARM will not come on.
23. The Low Pass filter cutoffs nominally have 3, 10, and 30 kHz 20% of
frequency, -3dB bandwidths for the LOW, MED and HIGH LP Filter switch
positions. Other cutoff frequencies are available, so determine the actual
cutoffs before testing.
24. Place the LP FILTER switch to LOW.
25. Increase the generator frequency until the meter indicates 70.7 ±9 g’s.
The frequency of the signal generator is the –3dB cutoff for the LP
FILTER.
26. Place the LP FILTER switch to MED.
27. Increase the generator frequency until the meter again indicates
70.7 ±9 g’s, the –3dB cutoff of the MED low pass filter.
28. Place the LP FILTER switch to HIGH.
29. Increase the generator frequency until the meter again indicates
70.7 ±9 g’s, the –3dB cutoff of the HIGH low pass filter.
30. Connect the counter and AC voltmeter to the CAL INPUT jack on the front
panel.
31. Place the CAL-OPER switch to CAL.
32. The counter indication will be 139.9 ±0.8 Hz and the AC voltmeter will
indicate 1.00 ±0.01 Volt RMS.
33. The front panel meter will indicate 100 ±3 g’s.
34. Vary the SENSITIVITY DIAL from 1-11; observe that the front panel meter
indication changes less than 1 g for any setting.
35. Place the SENSITIVITY switch to 10-110. The meter indication will remain
100 ±3 g’s.
36. Place the UNITS switch to MILS. The meter will indicate 100 ±3 MILS.
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