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Adjustment Procedures
5–10
AM700 Audio Measurement Set Service Manual
7. Using 50 W coaxial cable, connect the INPUT A of the audio analyzer to
TP4 (CHB OUT) and TP10 (AGND) of the AM700 analog acquisition
board.
8. Set the generator output of the audio analyzer for a 1 kHz sine wave at an
amplitude of 1 V.
9. On the audio analyzer, press the RELATIVE LEVEL key to set the reference
to 0.00 dB.
10. Set the generator output of the audio analyzer for a 80 kHz sine wave at an
amplitude of 1 V.
11. Adjust compensation capacitor C333 so that the relative level on the audio
analyzer reads 0.08 dB ±0.01 dB.
1. Using the 50 W coaxial cable and a BNC to hook clip adapter, connect input
B of the digital frequency counter to TP23 (DGND) and TP57 (SAMPLE
CLK) of the AM700.
2. Connect the WWV reference to input A of the digital frequency counter.
3. Adjust R340 (Sample Clock Adj) until the sample clock frequency readout
bounces between 12.28801 MHz and 12.28802 MHz.
NOTE. The WWV reference is used as an external clock to the digital frequency
counter to adjust the sample clock frequency.
Sample Clock Adjustment