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Performance Verification
4–30
AM700 Audio Measurement Set Service Manual
1. Press the FFT Application button (if the FFT Analyzer is not already
operating).
2. Connect the A and B Analog generator outputs to the Ch A and Ch B input
connectors.
3. Press the Configure button.
a. Touch the Input Selection soft key.
b. Touch the source “toggle” icon soft key to select FP A and FP B.
4. Set the Ch A and Ch B Input ranges to Auto. Press Clear Menu
5. Press the Control button in the Generator controls.
a. Press the Ch A Waveform soft key.
b. Select the Multitone signal and press the Enter button. Multitone signals
are used for this test because they are the most difficult for the autorange
circuitry to process.
c. Set the generator output amplitude to 0 dBu.
d. Press the Clear Menu button.
6. Touch the Generator icon soft key (at the top of the display area).
This displays the Generator status view window.
NOTE. The 0 dBu amplitude of the multitone signal applies to the RMS sum of
the tones, not to the individual tone amplitudes.
7. Using the Amplitude knob, slowly increase the generator output amplitude
(seen in the Generator status view window) until the auto range detects an
over-range condition (the word “clip” should appear momentarily in the top
right section of the display). This should occur at about + 2 dBu and again
between +7.9 and +8.1 dBu.
8. Decrease the amplitude from +8.1. The auto range should down range
between +7.1 to +7.3 dBu. Auto ranging is accompanied by the sound of
relays clicking inside the AM700.
9. Check to see that the auto range does not “hunt” for an acceptable range
when auto ranging occurs.
Check Autorange
Function