MAINTENANCE
4-11
H)
Repeat steps (C) through (G) for the Right Analog Output, adjusting output
trim VR201 at step (D).
4.
Check frequency response of Analog I/O.
A)
Verify 8600 software controls are set to their default settings. (Refer to page
4-8.)
B)
Be sure you are still in
BYPASS
mode [see step (3.F)].
C)
Connect the oscillator to the Left Analog Input XLR connector.
D)
Inject the Analog Input XLR connector with a level of 0 dBu (20 dB below the
A
NALOG
C
LIP
L
EVEL
setting) with the oscillator set to 100 Hz.
This is 20 dB below the clip level, which allows headroom for preempha-
sis. 75
µ
s preemphasis will cause 17 dB of boost at 15 kHz.
E)
Connect the audio analyzer to the 8600's Left Analog Output XLR connector.
F)
Verify a level of 0 dBu ±1 dB. Use this level as the reference level.
G)
Verify that frequency response at 50 Hz, 100 Hz, 400 Hz, 5 kHz, and 15 kHz is
within ±0.1 dB of the reference level.
This procedure tests the analog input circuitry, the A/D converter, the
DSP, the DAC, and the analog output circuitry.
H)
Repeat steps (C) through (G) for the right channel.
5.
Check distortion performance of Analog I/O.
A)
Verify 8600 software controls are set to their default settings. (Refer to page
4-8.)
B)
Be sure you are still in
B
YPASS
mode [see step (3.F)].
C)
Press
E
SCAPE
until you see the Main Meter screen
D)
Connect a THD analyzer to the Left Analog Output XLR connector. Set the
THD analyzer's bandwidth to 22 kHz.
E)
Connect the oscillator to the Left Analog Input XLR connector.
F)
For each frequency used to measure THD, adjust the output level of the oscil-
lator to make the
C
OMP
meter on the 8600 read
100
.
You will have to reduce the output level of the oscillator at higher fre-
quencies to compensate for the preemphasis boost in the 8600.
G)
Measure the THD+N at the frequencies listed below.
Frequency
THD+N Typical
THD+N Maximum
50 Hz
0.015%
0.03%
100 Hz
0.015%
0.03%
400 Hz
0.015%
0.03%
1 kHz
0.015%
0.03%
2.5 kHz
0.015%
0.03%
5 kHz
0.015%
0.03%
Содержание OPTIMOD-FM 8600
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