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Model 5065A
Circuit Diagrams, Theory, and Maintenance
Table 3-2. Front Panel Lamp Indications
FRONT PANEL LIGHTS
INTEGRATOR
LIMIT
CONTINUOUS
OPERATION
DESCRIPTION
OFF
ON
ON
ON
ON
OFF
OFF
OFF
Indicates Normal Operation
Indicates quartz oscillator is locked to resonant frequency
of RVFR but oscillator has exceeded one-half its control
range. To correct this proceed as follows:
1.
Set CIRCUIT CHECK switch to CONTROL.
2. Adjust OSC FREQ ADJ COARSE control for zero on
CIRCUIT CHECK meter. NOTE: this adjustment
may cause CONTINUOUS OPERATION lamp to go
off. If this occurs, momentarily press LOGIC RESET
button. CONTINUOUS OPERATION lamp should
come on and stay on.
Indicates one of the following troubles:
1.
Quartz oscillator control limit has been exceeded.
To correct, set CIRCUIT CHECK to CONTROL, ad
just OSC FREQ ADJ COARSE for zero on CIRCUIT
CHECK meter, then momentarily press LOGIC
RESET.
2. Synthesizer Assembly A1 failure.
Press LOGIC RESET switch. If CONTINUOUS OPERATION
lamp does not come on, look for one or more of the
following troubles:
1.
Quartz oscillator not locked to Rubidium resonance.
2.
2nd harmonic signal too low.
3.
Fundamental signal too high.
4.
Cell pr lamp ovens not operating normally. Check
CELL OVEN and LAMP OVEN on CIRCUIT CHECK
meter. If meter is maximum TURN INSTRUMENT
OFF.
5. Synthesizer failure.
6.
FUNCTION switch not set to OPER.
3-14. The two following calibration technique measures
the changing phase relationship between the 5065A
5 MHz output and a primary frequency standardd (HP
5061A Cesium Beam Frequency Standard or equivalent)
5 MHz output over an 8-hour period. Either procedure
may be used and both are equally accurate. The phase
change is converted to frequency error and the necessary
MAGNETIC FIELD adjustment is set in.
3-15. The procedure is divided into two parts; Table
3-9 lists recommended test instruments and equipment.
However, items with equivalent specifications may be
substituted.
a. Calibrating the measurement system.
b.
Performing the error measurement.
3-16.
Calibrating the Measurement System: To calibrate
the system for phase error measurement, proceed as
follows:
a. Connect equipment as shown in Figure 3-5.
b. Set HP 8405A FREQ RANGE to agree with
input frequency (5 MHz).
3-4
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