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Performance Verification
4–16
AM700 Audio Measurement Set Service Manual
Table 4–4: High bandwidth generator checks
Voltage Channel 117.1 Hz (reference
frequency)
11.719 Hz 20 kHz 80 kHz
24 V Ch A Voltage Do not check 80 kHz at
Ch B Voltage
24 volts.
8 V Ch A Voltage
Ch B Voltage
4 V Ch A Voltage
Ch B Voltage
2 V Ch A Voltage
Ch B Voltage
1 V Ch A Voltage
Ch B Voltage
0.5 V Ch A Voltage
Ch B Voltage
0.25 V Ch A Voltage
Ch B Voltage
125 mV Ch A Voltage
Ch B Voltage
62.5 mV Ch A Voltage
Ch B Voltage
10. Repeat step 9 for Analog B if you want. For a simplified test you can check
the Analog B output at 80 kHz only. This works because the output amplifier
for Analog B is independently checked to 20 kHz in the High Resolution
generator check procedure.
NOTE. The generator noise floor is difficult to measure accurately under most
conditions. The following method is an approximate measurement method.
1. Set the generator to High Resolution Mode if not already selected.
2. Check that the generator source resistance is set for 10 W.
3. Set the generator output amplitude to 0.0 Volts.
4. Measure the residual noise floor using a 400 Hz to 22 kHz measurement
bandwidth or A weighting.
Check Generator Noise
Floor