
22. Frequency Reference Error Test
ElECTRONiC COUNTER
FREQUENCY
STANDARD
SPECTRUM ANALYZER
Figure 2-37. Frequency Reference Test Setup
Equipment
Electronic Counter
.........................................
HP 5345A
1, 2, 5, or 10 MHz Frequency Reference with again rate
<l
X
lo-lo/day
..................................................
HP 5061A
BNC Tee
....................................................
1250-0781
Procedure
1. Allow analyzer to warm up at
25’C
ambient temperature for a
period of 30 days.
2. Set controls of electronic counter as follows:
FUNCTION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FREQ A
DISPLAY POSITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AUTO
GATE TIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
S
CHANNEL A Input Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
CHANNEL A
ATTEN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xl
CHANNEL A Coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC
CHANNEL A LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . midrange
3. Connect equipment as shown in Figure 2-37.
4. Record the frequency of the analyzer time base as measured by the
counter:
Frequency: 10. MHz
Date:
Time:
Ambient Temperature:
5. Allow the analyzer to remain undisturbed for 24 hours, then note
the time base frequency again:
Frequency: 10. MHz
Date:
Time:
Ambient Temperature:
Note
If the ambient temperatures recorded in steps 4 and 5 differ by more
than
l°C,
the frequency measurements may be invalid.
6. The difference in frequency between the two measurements should
be
<l
part in
log
(co.01 Hz at 10 MHz).
HZ
2-88
Performance Tests
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