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I.
MEASUREMENT
CONDITIONS
1, Standard measurement conditions
* Ambient temperature:
10~30°C (50~86°F)
* Ambient humidity:
30 ~90% RH
* Power voltage accuracy: 3%
2. Position of tape recorder
* When measuring, place the unit under test in a horizontal position.
3. Oscillator output voltage adjustment
* Connect the equipments as shown in the following and adjust the oscillator output control knob for 1 V (f=1kHz) through the
attenuator while keeping the attenuator at 0 dB.
* When supplying a signal to the tape recorder amplifier, adjust the input level using the attenuator.
Output control knob
Audio frequency oscillator
}
Attenuator
:
Vacuum tbe voltmeter
Oscilloscope
Il. TEST TAPE
Test tape life
The more frequently the test tape is used, the more the tape characteristics will deteriorate (e.g. lowering of recorded level, worsening
of frequency response particularly in high-frequency range, and an increase in wow due to tape elongation) until measured values be-
come unreliable.
Even in such a case when a tape is not used, but stored, for a long period of time, tape shows deterioration in per-
formance because of self damagenetization due to storage conditions, etc.
Please refer to the tape life specitication and use care not to use a tape longer than its rated life when servicing.
Frequence of use: Not more than 20 times for each tape length.
Storage period:
Not more than 6 months.
Test tape
PARTS NO.
PARTS NAME
SPECIFICATIONS
REMARKS
Standard recording level
5 times repetitive recording
OdB: STANDARD REC. LEVEL (160pWb/mm)
Ti
d: 1-7/8ips.
(4.
Wow and tape speed tepe
Tape Speed: 1-7/8os, (t.Bom/s
OdB: 250pWb/mm
Tape speed: 1-7/8ips. (4.8cm/s)
Azimuth tape
6.3kHz
Full track (15 min)
OdB: 250pWb/mm
Reference blank tape
Reference blank tape
(CrO2)
Unrecorded tape (20 min.)
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