E-E Noise Level Check; Distortion Check - Sony DSR-25 Service Manual

DSR-25

5. E-E Noise Level Check

Mode
Signal
Measurement Point
Measuring instrument
Specified Value
Note: 0 dBV = 1 Vrms
Switch setting
INPUT LEVEL select switch .......................... –10
Menu setting (AUDIO SET menu)
AUDIO MODE ................................................ FS48K
Checking method:
1) Connect the audio noise meter to the AUDIO OUTPUT termi-
nal (CH-1), and turn on the A-weight filter.
2) Measure the noise level at this time to check that it satisfies
the specified value.
3) For the CH-2, make a checking in the same manner.
STOP
Audio: No signal
Nothing is connected to the
AUDIO INPUT terminal
(CH-1, 2)
AUDIO OUTPUT terminal
(CH-1, 2)
Audio noise meter
(A-weight filter ON)
–74 dBV or less

6. Distortion Check

Mode
Signal
Measurement Point
Measuring instrument
Specified Value
Note: 0 dBs = 0.775 Vrms
Switch setting
INPUT LEVEL select switch .......................... –10
Menu setting (AUDIO SET menu)
AUDIO MODE ................................................ FS48K
Checking method:
1) Enter 1 kHz, +8 dBs signal to the AUDIO INPUT terminal
(CH-1).
2) Measure the distortion of the AUDIO OUTPUT terminal (CH-
1) at this time to check that it satisfies the specified value.
3) For the CH-2, make a checking in the same manner.
5-70
STOP
Audio: 1 kHz, +8 dBs signal
AUDIO INPUT terminal
(CH-1, 2)
AUDIO OUTPUT terminal
(CH-1, 2)
Audio distortion meter
0.025% (–72 dB) or less