7.2.8 Transient Processor
1. Set input signal to 5 kHz at OdBu.
2. Set TUNE to 700Hz.
3. Set PEAKING and NULL FILL to 12 o ’clock positions.
4. Place an oscilloscope probe on pin 16 of U407.
5. Vary HARMONICS control end to end.
6. Observe that DC Voltage goes approximately from .85 to 1.2 volts.
7.2.9 Waveform Generator
1. Set input as above (section 7.2.8).
2. Set HARMONICS to maximum.
3. Place an oscilloscope probe on pin 7 ofU406.
4. Vary TIMBRE Control end to end.
5. Observe that sinewave changes from full wave rectified to halfwave at about
60% of rotation range.
7.2.10 VCA Gain
1. Set input as above (section 7.2.8)
2. Set NR THRESHOLD at -40.
3. Set NR MODE to A.
4. Set TUNE to 700 Hz.
5. Set PEAKING to 12 o ’clock position.
6. Set NULL FILL to minimum.
7. Set HARMONICS to minimum.
8. Place an oscilloscope probe on TP403.
9. Observe that TP403 level = 2.2V p-p.
10. Set OPERATING LEVEL to -10.
11. Observe that TP403 level = 7V p-p.
7.2.11 Harmonics Multiplier
1. Repeat steps 1-8 listed in section 7.2.10
2. Set HARMONICS Control to maximum.
3. Set SOLO to "ON".
4. Set MIX for output = OdBu.
5. Set TIMBRE to even.
6. Verify that THD equals 35 percent.
7. Set TIMBRE to odd.
8. Verify that THD equals 12 percent.
Test and Nulling Procedure 7 -5
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