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SWEEP CONTROL:
SELECTIVITY
CONTROL:
B & T PROGRAM:
A three position switch which selects:
"Ext. Mech. ": An external mechanical drive (connected via the sock-
ets at the sides of the instrument) may be used to sweep the scale.
"Manual": The scale may be swept manually
.
"Ext. Volt.": The frequency may be swept by an external voltage con-
nected at the rear panel socket, FREQUENCY CONTROL VOLTAGE
"In".
Note: The scale cannot be swept manually while the sweep control is
in the "Ext. Mech." position.
Six different bandwidths may be chosen. The "Ext
.
Filter" position en-
ables an external filter to be connected. On this "Ext. Filter" position,
the internal A, B, C, D and Lin
.
filters are not operative. One of the
LED indicators is lit only when the FREQUENCY RESPONSE "Selec-
tive" push button is depressed.
A five position selector switch which enables programmes of band-
widths and/or averaging times to be chosen. The "Manual" position
enables a single bandwidth and averaging time to be chosen using the
SELECTIVITY CONTROL and the EFFECTIVE AVERAGING TIME selec-
tor. See section 4.5.
2.1.3. Beat Frequency Oscillator (BFO) Section
-·
-
- - -
- - - -
-
- - - -
--
BFO Reference Signal
s.4w:l""'(-.t
-~~
-
:1.....
,,_
- ·
·
>o..
~
~~~-::--
BFO Output Voltage
- :
:-
-
Ground
BFO Output
BFO Stop
7401 83/1
Fig.2 .4
.
Front Panel
-
BFO Section
17
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