4-10
MAINTENANCE
ORBAN MODEL 8382
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 8382 software controls are set to their default settings. (Refer to page
4-7.)
B)
Be sure you are still in
B
YPASS
mode [see step (3.F)].
C)
Connect a THD analyzer to the Left Analog Output XLR connector. Set the
THD analyzer's bandwidth to 22 kHz.
D)
Connect the oscillator to the Left Analog Input XLR connector.
E)
For each frequency used to measure THD, adjust the output level of the oscil-
lator to make the
C
OMP
meter on the 8382 read
100
.
You will have to reduce the output level of the oscillator at higher fre-
quencies to compensate for the pre-emphasis boost in the 8382.
F)
Measure the THD+N at the frequency levels 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%
7.5 kHz
0.015%
0.03%
10 kHz
0.015%
0.03%
15 kHz
0.015%
0.03%
G)
Repeat the above measurements for the right channel. Connect the oscillator
to the right analog input and the distortion analyzer to the right analog out-
put.
H)
Disconnect the oscillator and THD analyzer from the 8382.
6.
Test Digital Sample Rate Converter (Receiver).
A)
Verify 8382 software controls are set to their default settings. (Refer to page
4-7.)
B)
Be sure you are still in
B
YPASS
mode [see step (3.F)].
C)
Navigate to
S
ETUP
/
D
IG
I
N
C
ALIB
and
S
et the
I
NPUT
to
D
IGITAL
.
D)
Connect the digital source generator to the AES3 Digital Input XLR connector
of the 8382.
E)
Set the frequency of the digital source generator to 400 Hz and its output
level to 6 dB below full scale.
Содержание Optimod-TV 8382
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