6-80
4-6. OVERALL SIGNAL LEVEL, DISTORTION
AND SEPARATION CHECK
Mode CAM-REC and playback
Signal 1 CN501 pin 4 :400Hz, –38dBs
CN501 pin 2 : No signal
*2 CN501 pin 4 :No signal
CN501 pin 2 :400Hz, –38dBs
Measurement Point AUDIO output terminal (Left)
*AUDIO output terminal (Right)
Measurement Instrument
Audio level meter and distortion
meter
Specification Value Signal level
(Note)
1 Left output : –7.5 ± 2dBs
Right output : –27.5dBs or less
*2 Left output : –27.5dBs or less
Right output : –7.5 ± 2dBs
Distortion
Left/Right output : 0.8% or less
Note 1 : The value when band-pass filter of 200Hz to 6kHz is used.
Note 2 : Asterisk marks (*) are used in STEREO model.
Check procedure:
4-7. OVERALL NOISE LEVEL CHECK
Purpose : Checks noise level.
Mode CAM-REC and playback
Signal No signal : VC-188 board CN501
(Note)
Measurement Point AUDIO output terminal (Left/Right)
Measuring Instrument Audio level meter
(using IHF-A curve weighting filter)
Specification Value –65dBs or less
Note : Before making short circuit between CN501 pin 3 and pin
4, pin 3 and pin 2 (STEREO model only), remove the
flexible board from CN501
Check procedure:
Order Procedure
1 Insert a shorting to pin 3 and pin 4, pin 3 and pin
2 (STEREO model only) as CN501.
2 Make recording.
3 Remove the shorting plug.
4 Playback the recorded segment.
5 Confirm that the noise level at audio output terminal
(Left/Right) is –65dBs or less.
Order Procedure
1 Input 400Hz, –38dBs signal to CN501 pin 4. Short pin 2 and 3 of CN501.
2 Check that the right and left channels of AUDIO output terminal satisfy the specification 1.
Check that distortion satisfies the specification.
*3 Input 400Hz, –38dBs signal to CN501 pin 2. Short pin 3 and 4 of CN501.
*4 Check that the right and left channels of AUDIO output terminal satisfy the specification 2.
Check that distortion satisfies the specification.
200Hz 6kHz
18dB/OCT
18dB/OCT
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