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29th Annual
Precise
Time
and
Time Interual
(PTTI) Meeting
MAINTENANCE
OF
HP 5071A PRIMARY
FREQUENCY
STANDARDS
USNO
AT
H.
Chadsey (hc @planck.usno.navy.mil
A.
Kubik
(tony@ simon.usno.navy.rni1)
Time Service Department
U.S.
Naval Observatory
Washington, D.C. 20392
Abstract
The
US.
Naval Observatory
(VSNO)
has been operating Hewleti-Packard model
507lA
cesium-beam fraquenq standardr for
over
five years.
During
that
period,
there have been
a variety
of
failures and these devices have shown frequency and phase changes.
The
HP
5071A
model primary frequency standard oflers a very useful troubleshooting tool
by outputting the status of 22 digerenr operating parameters. This paper will present an
explanation of the parameters and show any correlation
of
them with the time, frequency,
and environmental changes. This paper will also
ofet some
indicators to predict future
device problems.
INTRODUCTION
The Hewlett-Packard
(HP)
model 5071A
Primary
Frequency Standard is a quantum
leap forward compared
to
the
HP
model
5061B.
Among the improvements is the
greater frequency stability through a broader temperature and humidity range.
HP
also improved the device's operational parameter monitoring capabilities. No
longer must people enter
the
room housing the device (disrupting its environment)
and physically make the measurements on the device.
The
new standards
can
output their parameters via
an
RS-232 connection to a computer
f o r permanent
filing and analysis.
49
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