Table 2-20. Input Attenuator Switching Uncertainty Test Settings
HP 4395A Step Attenuator
Input Attenuator Reference Level
0dB
0
40 dBm 50 dB
20 dB
0
20 dBm 30 dB
30 dB
0
10 dBm 20 dB
40 dB 0 dBm 10 dB
50 dB 10 dBm 0dB
d. Set the step attenuator to the rst setting 50 dB listed in the third column of Table 2-20 .
e. Perform the following steps.
i.
Press
4
Trigger
5
,
NNNNNNNNNNNNNNNNNNNN
SINGLE
to make a sweep.Wait for the completion of the sweep.
ii.
Press
4
Search
5
,
NNNNNNNNNNN
MAX
.
iii. Record the delta marker reading in the calculation sheet (\HP 4395A Reading"
column).
f. Change the HP 4395A input attenuator setting, the reference level setting, and the step
attenuator setting in accordance with Table 2-20 . Repeat step 8-e for each setting.
9. Remove the xed attenuation from the R input, and connect it to the A input.
10.
Press
4
Meas
5
,
NNNNN
A
to set the HP 4395A to the A input.
11.
Press
4
Scale Ref
5
,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
REFERENCE VALUE
,
4
-
5
,
4
3
5
,
4
0
5
,
4
x1
5
,
4
Scale Ref
5
,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ATTENUATOR MENU
,
NNNNNNNNNNNNNNNNNNNNNNN
ATTEN A
,
4
1
5
,
4
0
5
,
4
x1
5
, to set the HP 4395A controls to the reference setting for the test.
12. Repeat step 8 to measure the input attenuator switching uncertainly at the HP 4395A A
input.
13. Remove the xed attenuation from the A input, and connect it to the B input.
14.
Press
4
Meas
5
,
NNNNN
B
to set the HP 4395A to the B input.
15.
Press
4
Scale Ref
5
,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
REFERENCE VALUE
,
4
-
5
,
4
3
5
,
4
0
5
,
4
x1
5
,
4
Scale Ref
5
,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ATTENUATOR MENU
,
NNNNNNNNNNNNNNNNNNNNNNN
ATTEN B
,
4
1
5
,
4
0
5
,
4
x1
5
, to set the HP 4395A controls to the reference setting for the test.
16. Repeat step 8 to measure the input attenuator switching uncertainly at the HP 4395A A
input.
17. Calculate the test results using the equation given in the calculation sheet. Record the test
results in the performance test record.
2-56 Performance Tests
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