168 Chapter 8
Hardware Options
Verifying Option 107 Audio Input
Verification of Option 107
PSA settings:
Press the front panel
Mode key
Select the
Measuring Receiver key
Press
Measure key
Select
Audio AC Level
Function Generator settings:
Output level: 1.5 V rms
Frequency: 1 kHz
You are going to measure the output level of a source at 5 different
levels where each output level activates a different gain stage in the
Audio board. This will verify the audio board gain stages and signal
processing path.
Connect a function generator to the Audio input on PSA. This test
assumes a function generator with 50 ohm output impedance which will
cause the PSA to measure 2 times the function generator setting. If you
wish, you can also connect a voltmeter such as an Agilent 3458A to the
function generator using a BNC tee, and since the voltmeter and PSA
both have high input impedance relative to the function generator, both
the PSA and voltmeter will display the same voltage.
Function Generator
Amplitude
Expected PSA AC Level
Measurement
1.5 V rms 3.0 V rms
0.75 V rms 1.5 V rms
0.375 V rms 0.75 V rms
0.187 V rms 0.375 V rms
0.090 V rms 0.180 V rms
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