Chapter 2 259
Performance Verification Tests
30. Spurious Responses: Agilent E4401B and E4411B
17.Set the analyzer reference level to –15 dBm.
75 Ω Input only: Set the reference level to –20 dBm.
18.On the analyzer, press BW/Avg, Average, 20, and wait for “Vavg 20”
to appear along the left side of the display.
19.On the analyzer, press Peak Search (or Search) and record the marker
amplitude reading in Table 2-70 as the Lower Distortion Amplitude.
20.On the analyzer, press BW/Avg, Average Off.
21.On the analyzer, increment the center frequency by three times the
CF Step value. Press FREQUENCY, Center Freq, ↑, ↑, ↑. The center
frequency should now be one CF Step value above the synthesized
sweeper frequency.
22.Set the synthesized signal generator frequency to F2 as indicated in
Table 2-69.
23.Set the synthesized sweeper CW frequency to F1 as indicated in
Table 2-69.
24.On the analyzer, press BW/Avg, Average, 20, and wait for Vavg 20 to
appear along the left side of the display.
25.On the analyzer, press Peak Search (or Search) and record the marker
amplitude reading in Table 2-70 as the Upper Distortion Amplitude.
26.On the analyzer, press BW/Avg, Average Off.
27.Of the Lower Distortion Amplitude and Upper Distortion
Amplitudes recorded in Table 2-70, enter the most positive value as
the Worst Distortion Amplitude in Table 2-70. For example, if the
Upper Distortion Amplitude is –62 dBc and the Lower Distortion
Amplitude is –63 dBc, enter –62 dBc as the Worst Distortion
Amplitude.
28.If the analyzer has a 50 Ω input, enter –17 dBm as the Mixer Level
in Table 2-70 (–12 dBm input power – 5 dB input attenuation). If the
analyzer has a 75 Ω input, enter 36.75 dBmV as the Mixer Level in
Table 2-70 (–12 dBm = 36.75 dBmV).
29.Calculate the equivalent TOI by subtracting one half of the Worst
Distortion Amplitude (in dB) from the Mixer Level (in dBm or
dBmV). Enter the result in Table 2-70 as the Calculated TOI. For
example, if the Worst Distortion Amplitude is –62 dBc and the Mixer
Level is –17 dBm, the Calculated TOI would be: