Operation; Introduction; Operating Procedure; General - HP 5065A Operating And Service Manual

Model 5065A
Circuit Diagrams, Theory, and Maintenance
SECTION III
OPERATION
3-1. INTRODUCTION
3-2. This section provides operating procedures for the
5065A Rubidium Vapor Frequency Standard. Tables 3-1
and 3-2 gives the basic turn-on procedure. Figures 3-9,
3-10, and 3-11 explain front, top, and rear controls and
connectors.
3-3. OPTIONS 001 AND 002
(Option 003 = 001 and 002)
3-4. Operating procedures for Option 001 (Time Stand­
ard) and Option 002 (Standby Power Supply) are covered
in Paragraphs 3-19 through 3-31.
3-5. OPERATING PROCEDURE
3-6. General
3-7. In instruments equipped with Option 002, Standby
Power Suply, remember that the internal standby battery
is fully discharged when delivered and must be brought
to full charge (16 hours minimum) before it can deliver
rated standby power. Battery charging instructions are
included in Figure 3-2, Turn-On Procedure. For more
standby power, available accessories are the HP Model
5085A Standby Power Supply or HP Model K02-5060A
Power Supply.
3-8. Turn-On Procedure (see Figure 3-2)
3-9. Turn-On After Long Storage
If the 5065A has been in storage for longer than 2 months,
there is a possibility of cell flooding occurring in the RVFR
tube. If after 1 hour of warm-up from initial turn-on no
2nd harmonic is present, then cell flooding can be sus­
pected. The following procedure should be used to incor­
rect cell flooding.
a. Remove all power from 5065A and remove bot­
tom cover.
b. Disconnect the red and black twisted pair of wires
from XA4(1) and XA8(1) respectively.
c. Obtain a current-limiting power supply capable
of producing 1 amp (power supply voltage is not important).
d. Before turning on power supply, place a short
across its output terminals.
e. Connect the power supply as shown in Figure 3-1.
The short should remain in place on the power supply
output.
f. Set power supply voltage and current controls to
minimum position. The precautions of stepsd, e, and f are
to prevent the filter capacitor on the power supply output
from discharging into the RVFR.
Table 3-1. Operating Checks
CIRCUIT CHECKS
Switch Position
BATTERY
SUPPLY
LAMP OVEN
CELL OVEN
OSC OVEN
PHOTO I
5 MHz
CONTROL
ERROR
2ND HARMONIC
1 MHz
100 kHz
Meter Indication
35-45
Option 002)
38-42
10-45
10-45
25-50
25-50
35-45
(no load)
-50 to +50
0
20-50
38-42
(no load)
38-42
(no load)
Description
Indicates
battery voltage
Indicates+20
volts regulated
supply
Indicates
power to lamp
oven in RVFR
Indicates
power to
absorption
cell oven in
RVFR
Indicates
power to
quartz OSC
oven
Indicates
RVFR output
current
Indicates
5 MHz output
level
Indicates dc
control volt­
age to quartz
oscillator
Indicates fre­
quency dif­
ference
between RVFR
and micro­
wave field as
a dc voltage
Indicates 2ND
HARMONIC
level
Indicates 1
MHz output
level
indicates 100
kHz output
level
3-1