Ceyear 4041 Series, User Manual

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Chapter XI Performance Characteristics Test
155
coupler directly to the RF input port of the spectrum analyzer.
9) Press
【
Peak
】
on the spectrum analyzer and wait for completion of a new sweep. Press
【
Marker
】
[Detla],
【
Freq
】 【 ↑ 】
.
10) Turn on the RF output of the synthesized signal generator #2, and set the power to –15 dBm.
11) Press
【
Peak
】
on the spectrum analyzer.
12) Adjust the power level of synthesized signal generator #2 so that the differential marker reading of the
spectrum analyzer approaches 0 dB.
13) Press
【
Marker
】
[Detla],
【
Freq
】 【
↓
】 【
↓
】
on spectrum analyzer. Wait for completion of new sweep.
Press
【
BW
】
[Average On] 5 [Enter]. Wait for the video is averaged 5 times, and press
【
Peak
】
.
14) The peak-marker reading of spectrum analyzer is the low-end third-order intermodulation distortion product
△
A. According to the third-order intermodulation distortion product, the third-order intercept point is
calculated as follows (where L
0
is the level of mixer):
0
2
A
TOI L

 
(6)
15) On the spectrum analyzer, press
【
Freq
】 【 ↑ 】 【 ↑ 】 【 ↑ 】
, wait for completion of new sweep, and then
press
【
Peak
】
.
16) The marker difference at this time is the high-end intermodulation distortion product. Calculate the
third-order intercept point according to Equation 6 and compare the high-end intermodulation distortion
product with the low-end intermodulation distortion product. Record the smaller value as the final test result
in the corresponding test item in the “4041 Series Spectrum Analyzer Record Sheet”.