Sony DVCAM DSR-45P, Руководство по обслуживанию

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5-93
DSR-45/45P
(2) 2CH mode Check
Mode STOP
Signal Audio: 1 kHz, –10 dBs signal
20 kHz, –10 dBs signal
AUDIO IN terminal (CH-1, 2)
Measurement Point AUDIO OUT terminal (CH-1, 2)
Measuring instrument Audio level meter
Specified Value Difference in output level:
A = –1.5 to +1.5 dB
Note 1: 0 dBu = 0.775 Vrms/balance
Note 2: 0 dBs = 0.775 Vrms
Switch setting
INPUT LEVEL select switch .......................... –10
AUDIO REC LEVEL control knob (CH-1, 2)
........... The position at –10 dB Check of E-E Level Check
Menu setting (AUDIO SET menu)
AUDIO MODE ................................................ FS48K
Checking method:
1) Enter 1 kHz, –10 dBs signal to the AUDIO IN terminal (CH-1).
2) Measure the output of AUDIO OUT terminal (CH-1) at this
time, and assume it to be “a” (dBu).
3) Enter 20 kHz, –10 dBs signal to the AUDIO IN terminal (CH-1).
4) Measure the output of AUDIO OUT terminal (CH-1) at this
time, and assume it to be “b” (dBu).
5) Calculate the difference A (dB) between output levels “b” (dBu)
and “a” (dBu) to check that it satisfies the specified value.
A (dB) = b (dBu) – a (dBu)
6) For the CH-2, make a checking in the same manner.
5. Distortion Check
Mode STOP
Signal Audio: 1 kHz, +6 dBs signal
AUDIO IN terminal (CH-1 to 4)
Measurement Point AUDIO OUT terminal (CH-1 to 4)
Measuring instrument Audio distortion meter
Specified Value 0.025% (–72 dB) or less
Note:
0 dBs = 0.775 Vrms
Switch setting
INPUT LEVEL select switch .......................... –10
AUDIO REC LEVEL control knob (CH-1 to 4)
.......... The position at –10 dB Check of E-E Level Check
Menu setting (AUDIO SET menu)
AUDIO MODE ................................................ FS32K
Checking method:
1) Enter 1 kHz, +6 dBs signal to the AUDIO IN terminal (CH-1).
2) Measure the distortion of the AUDIO OUT terminal (CH-1) at
this time to check that it satisfies the specified value.
3) For the CH-2 to 4, make a checking in the same manner.