Teac A-650 - Audio Channel Performance; Channel Separation Measurement

6-4-10. CHANNEL SEPARATION
Preparations:
Specification: 30 dB (minimum)
AMP SPKR
OSCILLATOR
VTVM
I kHz FILTER
outi
o
1.
Fig. 6-20
Connection
Switch Setting:
LIMITER
DOLBY NR
3.
BIAS
EQ
OUT OUT
OUT
1
1
4.
5.
record
(I)
(2)
(3)
Signal Blank
Channel Separation Check Procedure
Fig. 6-21
31
R
L
TOR
TT~l L
s
o o
OUTPUT:
LINE:
MIC:
DECK
under TEST
Load
tape.
Apply a I kHz test-tone at -9 dB
(274 mV) into the left channel.
Place the deck in the record mode
for about 30 seconds .............. (I)
Rewind the tape to the starting
point of recording ..................... (2)
Play the tape and measure the
output level differences between
the left and right channels. . . (3)
A
NOTE
To check channel separation (cross
talk between channels), a 1 kHz nar 
row bandpass filter should be used.
Tire test signal delivered from an AF
oscillator should be tuned to the filter
used.
OSCILLOSCOPE
o
o
o
»■ « •
ATTENUTOR
ploy and compare
Numbers in parentheses correspond to
steps in Fig. 6-21.
Control Setting.
Specified Setting (See 6-2-2)
Specified Setting (See 6-3-2)
Minimum Setting
a TEAC MTT-5O5B test