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Performance Verification
4–14
WFM 90 and WFM 91 Service Manual
15. Set the audio generator for a 50 Hz tone output, with an amplitude of
+8.0 dBu.
16. Select 8 dBu from the Operating menu.
17. Check that the display amplitude is within 0.5 dB of the reference level
graticule lines.
18. Set the audio generator frequency to 5 kHz.
19. Check that the display amplitude is within 0.5 dB of the reference level
graticule lines.
20. Set the audio generator frequency to 10 kHz.
21. Check that the display amplitude is within 0.5 dB of the reference level
graticule lines.
22. Set the audio generator frequency to 15 kHz.
23. Check that the display amplitude is within 0.5 dB of the reference level
graticule lines.
24. Set the audio generator frequency to 20 kHz.
25. Check that the display amplitude is within 0.5 dB of the reference level
graticule lines.