Calibration Procedure for the BBE 482 (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 C27. You should read less than +30vdc.
2. With DVM set to DC volts, measure the negative end of C29. You should read less than -30vdc.
3. With DVM set to DC volts, measure the voltage on JMP5. Reading should be +15vdc, (+/-0.5vdc).
4. With DVM set to DC volts, measure the voltage on JMP4. Reading should be -15vdc, (+/-0.5vdc).
BBE PROCESS TEST:
1. Input a 5khz signal @ -l0dBu into channel A [B] input.
2. With DVM set to AC volts, measure the channel A [B] output.
3. With Process control at minimum (C.C.W.) DVM should read -11.5dBu (+/-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] input.
2. With DVM set to AC volts, measure the channel A [B] output.
3. With Lo Contour control at minimum (C.C.W.) DVM should read -11dBu (+/-1dBu).
4. With Lo Contour control at maximum (C.W.) DVM should read +3dBu (+/-1dBu).
BYPASS TEST:
1. Input a 500hz signal @ -l0dBu into channel A [B] input.
2. With DVM set to AC volts, measure the channel A [B] 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 -11dBu (+/-1dBu) and the Process “OUT” LED should be on.
LED TEST:
1. Input a 5khz signal @ -20dBu into the channel A [B] input. The yellow -20 LED should light.
2. Change input level to -l0dBu. The yellow -12dBu LED should light.
3. Change input level to -5dBu. The green -6dBu LED should light.
4. Change input level to 0dBu. The green 0 LED should light.
5. Change input level to +18dBu. The red clip LED should light.
END TEST.
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