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
3.With DVM set to DC volts, measure the voltage on JMP52. Reading should be +15vdc,
4.With DVM set to DC volts, measure the voltage on JMP5. Reading should be
BBE PROCESS TEST:
1.Input a 5khz signal @
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
4.With Process control at maximum (C.W.) DVM should read +2dBu
LO CONTOUR TEST:
1.Input a 50hz signal @
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
4.With Lo Contour control at maximum (C.W.) DVM should read +2dBu
BYPASS TEST:
1.Input a 500hz signal @
2.With DVM set to AC volts, measure the channel A [B] 1/4” jack output.
3.With the process “IN”, DVM should read
4.With the Process “OUT”, DVM should read
LED TEST:
1.Return both channels Process and Lo Contour controls to minimum (C.C.W.).
2.Input a 5khz signal @
3.Change input level to
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 @
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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