Panasonic RS-612US-D - Tape Speed and Wow;Flutter Measurement

Tape speed
Equipment:
* Digital electronic counter or
frequency counter (RP8067)
* Test tape---C-WAT
MEASUREMENT & ADJUSTMENT
Tape speed accuracy
1. Test equipment connection is shown below.
LINE OUT
oN ‘ ‘
Test
tape
Playback
mode
Digital
electric
counter
Fig. 9
. Play test tape (C-WAT 3,000Hz), and supply playback signal to fre-
quency counter.
. Measure this frequency.
. On the basis of 3,000 Hz, determine value by following formula:
Seca x 100} %
where, f = measured value
. Take measurement at middle section of tape.
Tape speed accuracy = (
Standard Value: + 1.5% |
Adjustment method
1. Play the test tape (middle).
2. Adjust the tape speed adjustment VR shown in fig. 20 so that fre-
quency becomes 3,000 #z.
Tape speed fluctuation
Make measurements in same manner as above (beginning, middle arid
end of tape), and determine difference between maximum and minimum
values and calculate as follows:
Tape speed fluctuation = (Baie x 100 }%
f1 =maximum value
f2 = minimum value
Standard Value: 1%
REMARKS
* Playback mode
Wow and flutter
Equipment:
+ Wow meter
* Test tape---C-WAT
1. Test equipment connection is shown below.
LINE OUT
Test tape Playback mode Wow meter
Fig. 10
. 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: 0.17% (WRMS)
+ Playback mode