Tascam 388 Studio 8 - Wowand Flutter Check

1
1-3-8. Fast Windíng Speed
1* Connect oscílloscope between TP1 test point
on the REEL SERVO PCB and ground.
2. Thread TEAC YTT-8013 test tape. In this
case, use of 7-¡nch reel ¡s permitted provided
both left and right reeis are the same size.
During fast forward or rewind mode, adjust
R150 (see Fig. 1-3-9) so that wavelength
displayed on the oscílloscope becomes 2.5
rnsec. (Fig. 1-3-10). Adjustment shouid be
satisfied at any tape windíng position.
4- Check that almost equal valué of fast windíng
speed is obtained between fast forward and
rewind modes.
2.5msec.
1-3-9. Wow-And-Flutter Check
(Reproduce Method)
1 Connect a Wow-and-Flutter to the deck as
shown in Fig. 1-3-11.
These meters will measure the ANSI peak
valué or the NAB rms valué depending on the
switch selection on the meter.
2. Playback the TEAC YTT-2003 test tape.
3. If the peak or rms weighted valué is to be
read, set the Wow-and-Flutter Meter for the
"Weighted" readings and aiso make sure that
the meter is properly calibrated.
4. As the measured results may vary with respect
to the location on the tape at which the mea-
surement is taken, at least two locations — at
the beginning and near the end of the tape —
shouid be checked. There may aiso be slight
differences in absolute valúes measured
according to the brand of the meter being
used.
Valúes shouid be as shown:
Fig. 1-3-10
DIN/IEC/ANSi (peak valué)
NAB (rms valué)
Weighted Weighted
±0.10%
0.05 %
FREQUENCV COUNTER
WOW/FLUTTER
METER
UNIT
under TEST
OUTPUT
o o
Fig. 1-3-11
1 10