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Performance Verification
4–28
AM700 Audio Measurement Set Service Manual
Check FFT Analyzer Operation
This operational check of the FFT Analyzer checks:
H Averaging
H Noise Floor
H High Resolution BW (20 kHz)
H High BW (80 kHz)
1. Select the FFT Analyzer if it is not already selected.
2. Set the High Resolution generator for 5 kHz at –50 dBu.
3. In the Input Configuration menu, select the generator as the acquisition input
source for CH A and CH B (normal default is FP A and FP B) by touching
the double arrow symbol next to the generator choice.
4. Set the Input Select to High Resolution Analog Inputs.
5. Set Average on.
6. Touch the Menu soft key; then touch the Windows soft key. Select the Kaiser
Bessel FFT window.
7. Check that the display is as shown in Figure 4–17. If you push, or have
already pushed, Rescale, the –50 dBu amplitude will be set to the top of the
FFT display screen and the bottom of the trace will be set to the bottom of
the FFT display screen.
Check FFT Analyzer