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12.2.5
Setting
Mode
Test Tape
AC mV meter
Input Signal
Recording/Playback Frequency
Response Adjustment
Overall Frequency Response
Using STD-608A with DOLBY NR OFF
Using STD-603 with DOLBY NR OFE
Using STD-6OB with DOLBYNR ON
Using STD-604 with DOLBY NR OFF
63Hr
125H2
333H2
,kHz
Ê
Usîng STD-604 with DOLBYN.R ON
Record
STD-608A
LINE OUTPUT
333H2, - 30dBv (31mV)
to LINE INPUT
Procedure
1. Set the TAPE SELECTOR to the NORM posi-
tion.
2. Adjust the INPUT level control so that the
AC mV meter reads - ZldBv (aa.6 mV).
3. Record the 333H2 and 6.3kHz signals onto the
STD608A. Play back the tape and adjust the
VR103 (L ch) and VR 203 (R ch) so that the
difference between two is OdB_t.b dB.
4. As listed in the specilications in Fig. 12-13
and check to see that performance meets
specifications.
Fig. 12-13 Recording/Playback
frequency response
adjustment
Frequency Response
Using STD-331A with DOLBY NR OFF
Howeuer, the right channel is compensated by -IdB
at
63H2, and -0.5d8 at 125H2 because of the ineulntion
effect.
63Hr
r25Hr
333Hr
e*",
ea*",
Using STD-608A with DOLBY NR ON
V R 1 0 3 ( L c h
VR203 (R cl'
333H2
,kHz
6.3kHz
lZtH.
63Hz
t2sHz
333H2
zkHz 6,3kHr lgkHz
Fis. 12-14 Frequency response
Fig. 12-15 Frequency response
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