BRUEL & KJAER 1023 - Page 12

Modulation Frequency to "16Hz"
Modulation Frequency to "Off"
Compressor Speed to "1000"
Generator to "Off'
5.75
Adjustment Procedure 1023.3
Change Frequency Dial back to approx. 1000 Hz and connect a 15 Oil OW resistor to the
"Load" terminals on the front.
Now P31 2 should be adjusted to such a position that there is no light in the "Distortion"
lamp with 10,5 V RMS on rear "Load" output while at 11,5 V RMS it should start lightening
up. (10,5 V into 150 corresponds to 0,7 A).
Disconnect the
150 resistor and connect an Oscilloscope til point AB2 on ZI 0032.
With a Frequency Display of 1000 Hz P205 should be adjusted for 1 V peak to peak ± 10%.
Adjust "Output Voltage" for a deflection on 1023 of -2 dB below full scale.
Connect
"Load" socket to "Compressor Input" and adjust Compressor Voltage for -2 dB.
P309 should now be adjusted for 10,5 V ± 0,2 V on V351 pin 6 'O'hich can be reached only
from the bottom side.
Connect "Load" socket to a Selective Voltmeter and adjust for an output signal of 1 OV at
1000Hz.
Adjust C337 for min. 1000 Hz output which should be approx. 80 dB below 10V.
Valid from serial no. 523774
3-3