HP 5065A Manual page 16

Modei5065A
Circuit Diag'rams, Theory, and Maintenance
Table 3-2. Front Panel Lamp Indications
FRONT PANEL LIGHTS
INTEGRATOR CONTINUOUS
LIMIT OPERATION
OFF
ON
ON ON
ON
OFF
OFF
OFF
3-14. The two following calibration technique measures
the changing phase relationship between the 5065A
5 MHz output and a primary frequency standardd IHP
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.
3-4
DESCRIPTION
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 FREO 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 A 1 failure.
Press LOGIC RESET switch. If CONTINUOUS OPERATION
lamp does not come on, look for one or more of the
following troubles:
1.
2.
3.
4.
5.
6.
•'
Quartz oscillator not locked to Rubidium resonance.
2nd harmonic signal too low.
Fundamental signal too high.
Cell or lamp ovens not operating normally. Check
CELL OVEN and LAMP OVEN on CIRCUIT CHECK
meter. If meter is maximum TURN INSTRUMENT
OFF.
Synthesizer failure.
FUNCTION switch not set to OPER.
However, items with equivalent specifications may b(
substituted.
a. Calibrating the measurement system.
b. Performing the error measurement.
3-16. Calibrating the Measurement System: To calibrat<
the system for phase error measurement, proceed a:
follows:
a. Connect equipment as shown in Figure 3-5.
b. Set HP 8405A FREO RANGE to agree wit
input frequency (5 MHz).