Advertisement
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
Test tape
Playback mode
Digital electric counter
Fig. 13
2. Play test tape (C-WAT 3,000Hz), and supply playback signal to fre-
quency counter.
3. Measure this frequency.
4. On the basis of 3,000Hz, determine value by following formula:
f—3,000
5
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. Play the test tape (middle).
2. Adjust the tape speed adjustment VR shown on page 18 so that fre
quency becomes 3,000 Hz.
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:
_
fi—fe
6
Tape speed fluctuation = 3.000
x 100 (%)
fi1=maximum value
f2=minimum value
Standard value: 1.5%
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. 14
. Use wow test tape (3,000Hz) and measure its playback signal on
wow meter.
. Measure at middie section of test tape.
I
| Standard value: 0.10% (WRMS)
+ Playback mode
Advertisement
