BBE Sonic Maximizer BBE 882 - Manual (Page 14)

12
Calibration Procedure for the BBE 882
(REV/S/ON 1.1)
NOTE: THIS UNIT WAS TESTED AND CALIBRATED AT THE FACTORY.
THIS PROCEDURE IS FOR QUALIFIED PERSONNEL ONLY.
INITIAL SETTINGS:
1. BBE Process controls VR1 and VR3 to minimum.(C.C.W.)
2. Lo Contour controls VR2 and VR4 to minimum.(C.C.W.)
3. Power switch “ON” and BBE function switch “IN”.
POWER SUPPLY TEST:
1. With DVM set to DC volts, measure the positive end of C37. You should read less than +30vdc.
2. With DVM set to DC volts, measure the negative end of C39. You should read less than -30vdc.
3. With DVM set to DC volts, measure the voltage on JMP52. Reading should be +15vdc, (+/-0.5vdc).
4. With DVM set to DC volts, measure the voltage on JMP5. Reading should be -15vdc, (+/-0.5vdc).
BBE PROCESS TEST:
1. Input a 5khz signal @ -l0dBu into channel A [B] 1/4” jack input.
2. With DVM set to AC volts, measure the channel A [B] 1/4” jack output.
3. With Process control at minimum (C.C.W.) DVM should read -12dBu (+/-1dBu).
4. With Process control at maximum (C.W.) DVM should read +2dBu (+/-1dBu).
LO CONTOUR TEST:
1. Input a 50hz signal @ -l0dBu into channel A [B] 1/4” jack input.
2. With DVM set to AC volts, measure the channel A [B] 1/4” jack output.
3. With Lo Contour control at minimum (C.C.W.) DVM should read -13dBu (+/-1dBu).
4. With Lo Contour control at maximum (C.W.) DVM should read +2dBu (+/-1dBu).
BYPASS TEST:
1. Input a 500hz signal @ -l0dBu into channel A [B] 1/4” jack input.
2. With DVM set to AC volts, measure the channel A [B] 1/4” jack output.
3. With the process “IN”, DVM should read -9dBu (+/-1dBu) and the Process “IN” LED should be on.
4. With the Process “OUT”, DVM should read -10dBu (+/-1dBu) and the Process “OUT” LED should be on.
LED TEST:
1. Return both channels Process and Lo Contour controls to minimum (C.C.W.).
2. Input a 5khz signal @ -18dBu into the channel A [B]1/4” jack input. The yellow -10 LED should light.
3. Change input level to -8dBu. The yellow -10dBu LED should light.
4. Change input level to +2dBu. The green 0dBu LED should light.
5. Change input level to +12dBu. The green +10dBu LED should light.
6. Change input level to +18dBu. The red clip LED should light.
XLR TEST:
1. Switch BBE Process “IN”.
2. Input a balanced 5khz signal @ -10dBu into the channel A [B] XLR jack input.
3. Using an oscilloscope, verify the you have a 0.3 volt peak to peak signal on both pins 2 and 3 of the
channel A [B] XLR jack output.
END TEST.
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