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4. Turn the frequency scale pointer to the frequency of interest, and set
the frequency range switch accordingly. If necessary, fine tuning can
be carried out using the FREQUENCY INCREMENT knob.
5. Adjust the INPUT SECTION ATTENUATOR until a suitable deflec-
tion is obtained without any indicated overload. If the deflection is
insufficient, even when the INPUT SECTION ATTENUATOR is in its
10 mV range, then adjust the OUTPUT SECTION ATTENUATOR.
If the INPUT OVERLOAD light flashes, turn the INPUT SECTION
ATTENUATOR switch to a higher range.
If the OUTPUT OVERLOAD light flashes, turn the OUTPUT SEC-
TION ATTENUATOR switch to a higher range.
4.5. USE OF THE B.F.O. SECTION
The B.F.O. section may be used with or without the regulation (com-
pression) circuit. If the compression circuit is not required, the COM-
PRESSOR SPEED selector should be in the "Off" position.
The output voltage (or the generated e.m.f.) from the generator may be
indicated on the meter scale of the 2010 by depressing the push-button
marked METER AND RECORDER, "B.F.O.". The full scale deflection is
fixed by the B.F.O. ATTENUATOR switch, and the output level is varied
using the B.F.O. OUTPUT VOLTAGE knob.
Note: Adjustment of the INPUT and OUTPUT SECTION A TTEN-
UATOR of the Measuring Amplifier section does not affect the B.F.O.
output.
If the compression circuit is used, the feedback signal is fed into the
COMPRESSOR INPUT socket.
To regulate the B.F.O. output signal the procedure is as follows:
1. Turn the COMPRESSOR VOLTAGE knob fully clockwise.
2. Turn the B.F.O. OUTPUT VOLTAGE knob fully anticlockwise.
3. Connect the feedback signal, which must be of a sufficiently high level
(at least 0.5 Volts) to the COMPRESSOR INPUT.
35
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