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Adjustment Procedures
AM700 Audio Measurement Set Service Manual
5–7
4. Do the power supply verification procedure using the oscilloscope to check
for proper power supply operation.
5. Adjust R15 (+5 V adjust) for 5.05 V on the DVM.
6. Vary the input voltage from 90 Vrms to 132 Vrms on low range or 180 Vrms
to 253 Vrms on high range to verify normal power supply operation over the
specified input voltage range.
Acquisition Board Adjustment
A pair of shields over portions of the acquisition board circuitry may have to be
removed to make the necessary measurements.
The following test equipment is needed to make the adjustment to the acquisition
board:
H Precision audio analyzer with XLR interconnection cables
H Alignment tool
H Male to male BNC coaxial cable, 50 W, 42 inches long
H BNC to hook clip adapter
1. Connect one generator output of the precision audio analyzer to the Ch A
XLR input of the AM700.
1. Set the generator output of the precision audio analyzer for a 20 kHz sine
wave at an amplitude of 15 V. See Figure 5–2 for the test point and
adjustment locations.
2. Set the AM700 input configuration for Front Panel Channel A and
Channel B.
3. Set the input configuration for the High Bandwidth acquisition channel.
4. If not already in the FFT application, start the FFT application and select
View 1 for display.
5. Set the AM700 for 15 averages for each of the two channels.
Test Equipment Required
Test Assembly
Adjust the High
Bandwidth A/D MSB for
Channels A and B