Model 8904A Performance Tests
Characteristic
Frequency
Internal
10
MHz
Time Base Accuracy
Performance
Test
1
Performance
Limits
Conditions
A50
ppm
FREQUENCYACCURACY
Specification
Description
The frequency of the internal
10
MHz
time base is measured directly with a counter.
Equipment
Frequency Counter
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HP
5314A
NOTE
Counters generally
do
not have an absolute accuracy specification. Rather the
accuracy
of
the counter
is
the absolute accuracy
of
the time standard against
which the counter’s time base
is
adjusted, degraded
by
aging, environmental
changes,
and the last digit uncertain@.
The
counter used in this test
should
be calibrated to within
*5
ppm (that
is,
50
Hz
out
of
10
MHz).
Procedure
1.
Connect the frequency counter’s input to the Multifunction Synthesizer’s rear-panel
10
MHz
REF
OUT
connector.
2.
Set the counter to read frequency with
at
least
10
Hz
resolution. The counter should read between
9 999
500
and
10
000
500
Hz
(that
is,
10
MHz
&500
Hz
or
GO
ppm).
10
MHz
Time Base Accuracy: 9 999 500
10
000
500
Hz
Performance Test
1
4-3
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