Chapter 2 105
Performance Verification Tests
13. Input Attenuation Switching Uncertainty
Measure Switching Uncertainty
Perform step 12 to step 15 for each measurement value in Table 2-19.
12.Set the 1 dB and 10 dB step attenuators to the Total Nominal
Attenuation setting value as indicated in Column 3 of Table 2-19 for
the various analyzer attenuation settings for each measurement.
Table 2-18 may be used as a reference for setting the step
attenuators to achieve the desired total nominal attenuation.
13.Similarly, set the corresponding analyzer attenuation and reference
level settings as indicated in Column 1 and Column 2 of Table 2-19.
14.Press Single, then Peak Search (or Search) and record the marker
amplitude reading as the Marker Delta Reading in Column 6 of
Table 2-19.
15.Calculate the Switching Error (Table 2-19, Column 7) by subtracting
the Ideal Marker Delta Reading and the Attenuation Error from the
Marker Delta Reading. Record the result in the performance
verification test record.
35 dB –30 dBm /
18.8 dBmV
30 dB 25 dB 7)
40 dB –25 dBm /
23.8 dBmV
25 dB 30 dB 8)
45 dB –20 dBm /
28.8 dBmV
20 dB 35 dB 9)
50 dB –15 dBm /
33.8 dBmV
15 dB 40 dB 10)
55 dB –10 dBm /
38.8 dBmV
10 dB 45 dB 11)
60 dB –5 dBm / 43.8
dBmV
5 dB 50 dB 12)
65 dBa0 dBm /
48.8 dBmV
0 dB 55 dB 13)
a. Does not apply to Agilent E4401B or E4411B.
Table 2-19 Input Attenuation Switching Uncertainty Worksheet
Column 1 Column 2 Column 3 Column 4 Column 5 Column 6 Column 7
Analyzer
Internal
Attenu-
ation
Setting
Analyzer
Reference
Level
Setting
50 W Input/
75 W Input
Total
Nominal
Attenu-
ation
Setting
Attenu-
ation
Error
(dB)
Ideal
Marker
Delta
Reading
Marker
Delta
Reading
(dB)
Test
Record
Entry –
Switching
Error
(dB)