HP 4934A - Page 128

Unity Gain and Flatness Check
2 Set SAl as follows:
Gain : Unity
Filter : Flat
3 Set the AC Calibrator output level to 0.7746 V at 20 Hz then switch on the
OUTPUT.
4 Check that the AC Voltmeter is between 0.6517 V and 0.9206 V.
5 Set the AC Calibrator to each frequency listed in the following table and check
the corresponding AC Voltmeter reading
AC Calibrator Frequency
AC Voltmeter Reading
50 Hz
0.6517 V to 0.9206 V
200 Hz
0.6517 V to 0.9206 V
1000 Hz
0.6517 V to 0.9206 V
15 kHz
0.6517 V to 0.9206 V
60 kHz
0.6517 V to 0.9206 V
85 kHz
0.6517 V to 0.9206 V
20 dB Gain and Flatness Check
6 Set SAl as follows:
Gain : 20 dB
Filter : Flat
7 Set the AC Calibrator output level to 7.746 mV at 20 Hz.
8 Check that the AC Voltmeter reading is between 65.17 mV and 92.06 mV.
9 Set the AC Calibrator to each frequency listed in the following table and check
the corresponding AC Voltmeter reading.
A-2 Service Accessory 1 (SA1)
20 dB Ampiifler/4 kHz Filter