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Model 5065A
Circuit Diagrams, Theory, and Maintenance
4-18. Two 1 PPS inputs connect to the A16 Digital Div
ider Power Supply from the A5 module. One input pulse
is shaped in a blocking oscillator and then amplified to
provide the front panel 1 PPS "tick" output. The other
1 PPS input triggers a flip-flop stage which provides
clock-driving pulses. The flip-flop output drives push-pull
amplifiers to pulse the front-panel clock at a 1 PPS (or
10 PPS) rate.
4-19. The A14 Logic Assembly monitors several key
points in the 5065A circuits and turns off the CONTIN
UOUS OPERATION lamp to indicate an operational
discontinuity when one or more of the logic inputs in
dicate a "non-operating" condition. These logic inputs
are shown in Table 4-1. In addition to the
CONTIN
UOUS OPERATION lamp output, the Logic Assembly
delivers an INTEGRATOR LIMIT lamp output when the
A9 integrator output exceeds 50% of maximum.
After
an operational discontinuity, the LOGIC RESET switch
resets the CONTINUOUS OPERATION lamp when all
logic inputs are "operational."
Table 4-1. Logic Signals
Signal
a. Synthesizer Lock
Signal
b.
AC Amplifier 2nd
Harmonic Signal
c.
Phase Detector
Fundametal Error
Signal
d.
Cell Temperature
Signal
e.
Lamp Temperature
Signal
f.
Function Switch
Signal
Non-Operational
Condition
When present
When absent
When too much signal
When cell oven is full
on or turned off
When lamp oven is
full on or turned off
When present with
Function switch at
LOOP OPEN
4-20. OPTION 002, STANDBY POWER SUPPLY
4-21. Standby Power Supply Option 002 automatically
cuts in battery power if there is an ac (or dc) line in
terruption; for example when the unit is moved. This
is accomplished by floating the battery across the
power supply so that the battery takes over should ac
(or dc) line power fail.
This option consists of A2
Battery Charger Assembly, the nickel-cadium battery,
and the BATTERY switch and lamp. The nickel-cadium
standby battery is charged as desired in either FAST
CHARGE mode or a FLOAT (trickle charge) mode by
a constant current charging circuit.
The front panel
BATTERY lamp pulses on and off to indicate a line-
power discontinuity.
With the BATTERY switch at
FAST CHARGE, the BATTERY lamp glows steadily.
4-22.
The FAST CHARGE position of the BATTERY
switch is used to recharge the battery after discharge.
After charging in the FAST CHARGE position, the
BATTERY switch is set to FLOAT, for a trickle charge
to maintain battery charge.
Figure 4-3. RVFR Assembly Block Diagram
RF OSCILLATOR
=100 MHz
FILTER
CELL
ABSORPTION
CELL AND
MICROWAVE
CAVITY
4-3
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