BBE Sonic Maximizer BBE 802 - Manual (Page 8)

Calibration Procedure for the BBE Model 802
For serial numbers up to 2XXXX
Equipment Required:
Audio Signal Generator
AC/DC Voltmeter
This procedure details calibration of channel A. Comments (in brackets) pertain to channel B. All tests are done with a signal
level of OdBu (,775Vrms) except for clip indicator calibration.
Procedwe:
1. Apply AC power. Engage the process control.
2. Connect a jumper between TP2 (TP6 for channel B) on the PC board and signal ground.
3. Set channel A process control to mid-scale.
4. Set channel A line gain control fully clockwise.
5. Set channel A low frequency level control fully counterclockwise.
6. Set VR6 (VR14 for channel B) fully clockwise.
7. Set signal generator to 500Hz. Apply signal to channel A input.
8. Set voltmeter for AC volts and connect to TP4 on the PC board (TPS for channel B).
9. Adjust VR8 (VR16 for channel B) until the voltmeter indicates IVrms.
10. Connect the voltmeter to channel A output.
11. Adjust VR6 (VR14 for channel B) until the voltmeter indicates OdBu (.775Vrms).
12. Set the signal generator output to 5kHz.
13. Adjust VR5 (VR13 for channel B) until the voltmeter indicates OdBu (.775Vrms).
14. Set the signal generator output to 500Hz.
15. Set the voltmeter to DC volts.
16. Connect the voltmeter to TP3 (TP7 for channel B). Note the DC voltage at this point. (Approximately 0.5 VDC).
17. Set the signal generator output to 5kHz.
18. Connect the voltmeter to TP1 (TP5 for channel B).
19. Adjust VR4 (VR12 for channel B) until the voltmeter reads the same amplitude found in Step 16, but in a negative
direction.
20. Set the signal generator output to -t-24dBu (12.28Vrms) at 500Hz.
21. Adjust VR7 (VR15 for channel B) until the front panel clip indicator just lights.
THIS COMPLETES THE CALIBRATION OF THE BBE MODEL 802