Adjustment Of The B.f.o. Type 1022 - BRUEL & KJAER 4212 Instructions And Applications

A. Adjustment of the B.F.O. Type 1022.
1.
Adjust the frequency scale as described under "operation" item "A"
in the Instruction Manual for 1022.
2. The setting of the controls should be made according to the follow-
ing table.
Terminal, Knob, Switch
I
Position
POWER
"On"
POWER FREQUENCY BEAT
Only used for frequency
calibration
AUTOMATIC SCANNING "Off"
FREQUENCY INCREMENT "0"
MODULATION FREQUENCY "Mod. Off"
OSCILLATOR STOP
Only used for checking
apparatus noise levels
REMOTE CONTROL Plug in
FREQUENCY DEVIATION Any pos.
COMPRESSOR SPEED " 100" *)
FREQUENCY SCALE
Is adjusted
ALIGNEMENT
Only used for checking level
1ooo c/s REF. SIGNAL and synchronization with paper
on Level Recorder 2305
OUTPUT LEVEL
"0"
*)
At higher regulating speeds the distortion increases due to a tendency of the Compressor
to regulate on the wave shape of the output signal. This phenomenon is most pro-
nounced at lower sound pressure levels in the lower frequency range.
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