Teac A-6300 - Page 41

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20 50 100 200 500 IK 2K 5K 10K 15K 20K 30K 50K
IN Hz
Fig. 13-8 Frequency Response limits
- RECORD -
OPTIMUM ERASURE MEASUREMENT -
NOTE: To measure erase efficiency, a 1 kHz Band Pass Filter
(TEAC M-206A filter) must be used.
Fig. 13-9 Erasure Efficiency check Set-up
T- 295
Following is the measurement procedure at 7-1/2 ips using the TEAC
reference tape. Type YTT-8013:
1. Apply a 1 KHz signal at lOdB above the operating level of -8dB, to the
left channel LINE IN jack.
2. Make a 30 second recording of the above signal and rewind to beginning
of this recording.
3. Disconnect the 1 KHz signal source (A.F. oscillator) from the LINE IN
jack.
4. Connect a TEAC Test Set (M-826A), or equivalent, to the left channel
OUTPUT jack, through a 1 KHz Narrow Band Pass Filter (TEAC M-206).
5. Set the recorder output switch to "TAPE monitor".
6. Put recorder in the R.ECORD mode and "record" (erase) over this previous
recording; then rewind to begining again.
7. Put recorder in play mode and monitor the left channel output on the
Test Set meter.
8. Difference in output level, compared to the original output level,
should be more than -68 dB.
9. Repeat the same procedure on the right channel.
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