Technics RS-M10 - Page 5

Tape speed
Equipment:
+ Digital electronic counter or
frequency counter
+ Test tape --- QZZCWAT
Wow and flutter
Equiprnent:
* Wow meter
* Test tape --- QZZCWAT
MEASUREMENT & ADJUSTMENT
Tape speed accuracy
1. Test equipment connection is shown below.
LINE OUT
k
bd
.
Test
tape
Playback
mode
Digital
electric
counter
Fig. 12
2. Playback test tape (QZZCWAT 3,000H2z), and supply playback signal
to frequency counter.
3. Measure this frequency.
4. On the basis of 3,000Hz, determine value by following formula:
f—3,000 7
3,000 x 100 (%)
where, f= measured value
5. Take measurement at middle section of tape.
Tape speed accuracy =
| Standard value: +1.5%
Adjustment method
1. Playback the test tape (middle).
2. Adjust so that frequency becomes 3,000 Hz.
3. Tape speed adjustment VR shown in fig. 26.
Tape speed fluctuation
Make measurements in same manner as above (beginning, middle and end
of tape), and determine difference between maximum and minimum values
and calculate as follows:
PP 100 (9)
T d fluctuation =
ape speed fluctuation 3.000
fi =maximum value
f2=minimum value
Standard value: 1%
1. Test equipment connection is shown below.
LINE QUT
Test tape Playback mode Wow meter
Fig. 13
. Use wow test tape (3,000Hz) and measure its playback signal on
wow meter.
. Wow and flutter is expressed in percentage and that measurement
can be weighted by JIS network (WRMS).
. Measure at middle section of test tape.
Standard value: 0.07% (WRMS) |
REMARKS
* Playback mode
* Playback mode