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overload condition or a change in a digit
on the Nixie frequency display. The
screwdriver operated switch to the right
of the socket enables a change in either
the 3rd, 4th or 5th digit from the left
on the Nixie display to be recorded (see
section 5.3.3). The pin connections of
the socket are shown in Fig.2.5.
To Event
Marker input
on Recorder
171413
Fig.2.5. Pin connections of the Overload and Frequency Marking socket,
(Viewed Externally)
FREQUENCY RANGE
ADJUSTMENT:
FIXED FREQ. 1.2 MHz and
VAR. FREQ. 1.Q-1.2 MHz
VOLTAGE SELECTOR:
Two screwdriver operated potentiome-
ters which can be used to lim it the fre-
quency range of the Voltage Controlled
Oscillator (V.C.O.) output, which limits
the B.F.O. frequency range. Mechanical
movement of the scale pointer is not
restricted but the oscillator output and
the Nixie display are switched off. The
output from the FREQUENCY CON-
TROL VOLTAGE "Out" Socket is un-
affected.
Control
voltages for
other external
equipment.
For selection of correct mains supply
voltage, unscrew the central fuse, and
turn the switch using a coin or a wide
bladed screwdriver. The fuse is 250 V,
500 rnA rated.
17
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