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Adjustment Procedures
AM700 Audio Measurement Set Service Manual
5–9
6. Press Rescale in the System Control front panel selections.
7. While observing the FFT, adjust R252 until the null point is reached for the
second and third harmonics.
8. Move the test signal from the Channel A input to the Channel B input and
select View 2 for display.
9. Press Rescale in the System Control front panel selections.
10. While observing the FFT, adjust R245 until the null point is reached for the
second and third harmonics.
1. Set up AM700 as follows:
a. Press the Configure button.
b. Touch the Input Selection soft key.
c. Use the source “toggle” icon to set the AM700 input source for FP A
and B.
d. Set the input attenuation for Ch A and Ch B to +14 dBu (3.88 V).
e. Connect the output of the audio analyzer to the Channel A XLR analog
input of the AM700.
f. Using 50 W coaxial cable and a BNC to hook clip adapter, connect
INPUT A of the audio analyzer to TP8 (Ch A OUT) and TP9 (AGND)
of the AM700 analog acquisition board.
2. Set up the precision audio analyzer as follows:
a. Set the generator output of the audio analyzer for a 1 kHz sine wave at
an amplitude of 1 V.
b. Set the audio analyzer input mode to A UNBAL and the input termina-
tion to A 600 W OUT.
3. On the audio analyzer, press the MEAS key, and then the RELATIVE
LEVEL key to set the reference to 0.00 dB.
4. Set the generator output of the audio analyzer for a 80 kHz sine wave at an
amplitude of 1V.
5. Adjust compensation capacitor C335 so that the relative level on the audio
analyzer reads 0.08 dB ±0.01 dB.
6. Connect the output of the audio analyzer to the Channel B input of the
AM700.
Adjust the Attenuator
Compensation for
Channels A and B