BBE manual Calibration Procedure for the BBE 882 REV/S/ON, Initial Settings

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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.

5381 Production Drive

Huntington Beach, CA 92649

(714) 897-6766

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