Audio System Adjustments; Playback Level Check; Overall Level Characteristics Check; Overall Distortion Check - Sony DCR-TRV940 Adjustment Manual

DCR-TRV940/TRV940E/TRV950/TRV950E
COVER COVER
3-5.

AUDIO SYSTEM ADJUSTMENTS

[Connecting the measuring instruments for the audio]
Connect the audio system measuring instruments in addition to
the video system measuring instruments as shown in Fig. 6-3-10.
Audio
oscillator
Attenuator
600 Ω (270 Ω (1-249-410-11) +330 Ω (1-249-411-11))
Main unit
A/V jack
Audio (L)
Audio (R)
Video
In Recording
Main unit
L
600 Ω
MIC jack
R
In Playback
Audio level meter or
distortion meter
47 k Ω
47 k Ω: 1-249-437-11
TV monitor
Fig. 6-3-10

1. Playback Level Check

Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
Checking Method:
1) Check that the playback signal level is the specified value.

2. Overall Level Characteristics Check

Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
Checking Method:
1) Input the 400 Hz, –66 dBs signal in the MIC jack.
2) Record in the camera mode.
3) Playback the recorded section.
4) Check that the 400 Hz signal level is the specified value.

3. Overall Distortion Check

Mode
Signal
Measurement Point
Measuring Instrument
Specified Value
Checking Method:
1) Input the 400 Hz, –66 dBs signal in the MIC jack.
2) Record in the camera mode.
3) Playback the recorded section.
4) Check that the distortion is the specified value.
6-64
VTR playback
Alignment tape:
For audio operation check
(XH5-3 (NTSC))
(XH5-3P (PAL))
Audio left or right terminal of A/V
jack
Audio level meter and frequency
counter
32 kHz mode: 1 kHz, + 3.0 ± 2.0 dBs
48 kHz mode: 1 kHz, + 3.0 ± 2.0 dBs
44.1 kHz mode:
The 7.35 kHz signal level during EMP
OFF is +2.0 ± 2.0 dBs.
The 7.35 kHz signal level during EMP
ON is –6 ± 2 dB from the signal level
during EMP OFF.
Camera recording and playback
400 Hz, –66 dBs signal: MIC jack left
and right
Audio left or right terminal of A/V
jack
Audio level meter
–7.5 ± 3.0 dBs
Camera recording and playback
400 Hz, –66 dBs signal: MIC jack left
and right
Audio left or right terminal of A/V
jack
Audio distortion meter
Below 0.4%
(200 Hz to 6 kHz BPF ON)