Tascam DA-30 - Page 32

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“If adjusted to +DC, the upper bits will be “L’’ only (Fig.
4-11 @ }. Conversely, if adjusted to —DC, the upper bits
will be “H” only (Fig. 4-11 @ ). 1f adjusted exactly at
O V, the probability of the occurrence of “L” and “H”
will be equal, and the uppermost bit (most significant
bit) will continuously alternate between “L” and ‘‘H”
(Photo 4-7, Fig. 4-11 @ ) with the result that the S/N
will deteriorate and the S/N value will fluctuate. There-
fore, adjust to a point where upper bits will always be
“L" and the lower bits stand out least (Photo 4-6, Fig. 4-
11@).
Photo 4-7
2. Confirmation of the LINE minimum input level
1) Load a blank TY-30B tape then set the INPUT LEVEL
control to the maximum position and set the unit to
the REC monitor mode (press only the REC button).
2) Input the 1 kHz signal from the LINE INPUT, then
_ adjust the input level to a level at which the “OVER”
point of the level meter hardly ever lights using the
attenuator. The LINE input level at this time should
be within -6 £1dBV, and the difference between
channels should be within 1 dB.
3. Setting the LINE input level (reference recording
input/output)
1) Load a blank TY-30B tape then input a 1 kHz +6
dBV signal to the LINE INPUT, and set the unit to
the REC monitor mode (press only the REC button).
2) Turn the INPUT LEVEL control, and set it so that the
level meter indication hardly ever reaches the OVER
point. The output level at this time should be 2.0
+0.5V.
32
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