218 Chapter 2
Performance Verification Tests
25. Frequency Response (Preamp On): Agilent E4401B
8. Record the marker (Mkr1) amplitude reading in Table 2-58.
9. Set the source to the next frequency listed in Table 2-58.
10.Set the analyzer center frequency to the next frequency listed in
Table 2-58.
11.On the analyzer, press Peak Search (or Search).
12.Adjust the source amplitude to obtain a marker amplitude reading
on the analyzer of –32.00 dBm ±0.2 dB.
13.Record the current Channel B power reading in Table 2-58 as the
Current Channel B reading.
14.Record the marker (Mkr1) amplitude reading in Table 2-58 as
marker (Mkr1) Amptd.
15.Repeat step 9 through step 14 for each frequency in Table 2-58.
16.Copy the splitter tracking errors from Table 2-57 into Table 2-58.
17.Calculate the Flatness Error for each frequency in Table 2-58 as
follows:
For example, if marker (Mkr1) Amptd is –33.32 dBm, Current
Channel B is –12.4 dBm, and Splitter Tracking Error is –20.07 dB,
Flatness Error would be –0.85 dB.
18.Record the Flatness Error for 50 MHz below as the 50 MHz
Ref Amptd:
50 MHz Ref Amptd __________
19.Calculate the Flatness Relative to 50 MHz for each frequency in
Table 2-58 as follows:
For example, if Flatness Error is –0.30 dB and 50 MHz Ref Amptd is
0.15 dB, Flatness Relative to 50 MHz would be –0.45 dB.
Flatness Error Mkr1 AmptddBm Current Channel BdBm Splitter Tracking ErrordB
––=
Flatness Relative to 50 MHz Flatness Error 50 MHz Ref Amptd–=
Table 2-58 Frequency Response Worksheet, Preamp On
Frequency
Current
Channel B
Reading
Marker
(Mkr1)
Amptd
Splitter
Tracking
Error
Flatness
Error
Flatness
Relative to
50 MHz
100 kHza
500 kHza
1 MHz
5 MHz