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Adjustment Procedures
5–10
WFM 90 and WFM 91 Service Manual
Perform the following steps to adjust the audio gain:
1. Connect the output from the audio generator to the AUDIO IN connector.
2. Set the audio generator for a 1 kHz tone output with an amplitude of
+8.0 dBu. Select Signal On from the audio generator.
3. Select the AUDIO display mode on the WFM 90 or WFM 91 Handheld
Waveform, Vector, Picture, and Audio Monitor.
4. Select 8 dBu from the Operating menu.
5. Select AUD GAIN from the Calibration menu, and then select CAL.
6. Adjust the Arrow Buttons so that the signal display lands exactly on the
8 dBu graticule lines.
7. Select CAL MENU, and then select SAVE.
Audio Gain