Playback Level Check; Overall Level Characteristics Check; Overall Distortion Check; Overall Noise Level Check - Sony DSR-250 Service Manual

1. Playback Level Check

Mode VTR playback
Signal Alignment tape:
Measurement Point Audio CH1 or CH2 terminal of
AUDIO jack
Measuring Instrument Audio level meter and frequency
counter
Specified Value 32 kHz mode: 1 kHz, +8.2 ± 2.0dBs
48 kHz mode: 1 kHz, +8.2 ± 2.0dBs
44.1 kHz mode:
Menu setting:
A REF LEVEL ............................................... –20dB (NTSC)
................................................... –18dB (PAL)
Checking Method
1) Check that the playback signal level is the specified value.

2. Overall Level Characteristics Check

Mode Camera recording and playback
Signal 400Hz, –60 dBs signal: XLR jack
CH1 and CH2
Measurement Point Audio CH1 or CH2 terminal of
AUDIO jack
Measuring Instrument Audio level meter
Specified Value –10 ± 3.0dBs
Menu setting:
A REF LEVEL ............................................................. –12dB
Checking Method
1) Input the 400Hz, –60dBs signal in the XLR jack.
2) Record in the camera mode.
3) Playback the recorded section.
4) Check that the 400Hz signal level is the specified value.

3. Overall Distortion Check

Mode Camera recording and playback
Signal 400Hz, –60dBs signal: XLR jack
CH1 and CH2
Measurement Point Audio CH1 or CH2 terminal of
AUDIO jack
Measuring Instrument Audio distortion meter
Specified Value Below 0.4%
(200Hz to 6kHz BPF ON)
Menu setting:
A REF LEVEL ............................................................. –12dB
Checking Method
1) Input the 400Hz, –60dBs signal in the XLR jack.
2) Record in the camera mode.
3) Playback the recorded section.
4) Check that the distortion is the specified value.
For audio operation check
(XH5-3 (NTSC))
(XH5-3P (PAL))
The 7.35kHz signal level during
EMP OFF is +8.2 ± 2.0dBs.
The 7.35kHz signal level during
EMP ON is –6.2 ± 2.0 dB from the
signal level during EMP OFF.

4. Overall Noise Level Check

Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
Menu setting:
A REF LEVEL ............................................................. –12dB
Checking Method
1) Insert a shorting plug in the XLR jack.
2) Record in the camera mode.
3) Playback the recorded section.
4) Check that the noise level is the specified value.

5. Overall Separation Check

Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
< > : CH1 check
[ ] : CH2 channel check
Menu setting:
A REF LEVEL ............................................................. –12dB
\Checking Method
1) Input the 400Hz, –60dBs signal in the <CH2> [CH1] terminal
of the XLR jack only.
2) Record in the camera mode.
3) Playback the recorded section.
4) Check that the signal level of the audio <CH1> [CH2] terminal
is the specified value.
5-75
Camera recording and playback
No signal: Insert a shorting plug in the
XLR jack
Audio CH1 or CH2 terminal of
AUDIO jack
Audio level meter
Below –45dBs
(IHF-A filter ON, 20kHz LPF ON)
Camera recording and playback
400Hz, –60dBs signal: XLR jack
<CH2> [CH1]
(Insert a shorting plug in the XLR
jack <CH1> [CH2] )
Audio <CH1> [CH2] terminal of
AUDIO jack
Audio level meter
Below –40dBs