Ceyear 4041 Series, User Manual

Page: 163 / 203

Chapter XI Performance Characteristics Test
151
Fig 11-9 Second harmonic distortion testing setup
Second harmonic distortion (

4 GHz)
1) Connect the test instrument as shown in Fig 11-9. The spectrum analyzer provides a 10 MHz reference
frequency for the synthesized signal generator and the 1 GHz low pass filter is used.
2) Set the frequency of 1464C to 900 MHz, the amplitude to -30 dBm, and the RF output on.
3) Set up the spectrum analyzer as follows:
Center frequency 900 MHz
Span 200 Hz
Reference level -30 dBm
4) Press
【
Peak
】
on the spectrum analyzer. Adjust the power level of 1464C so that the reading of spectrum
analyzer is -30 dBm

0.1 dB.
5) Press
【
Marker
】
[" Differential Mode] to set the center frequency to 1.8 GHz.
6) Press
【
Peak
】
after the spectrum analyzer completes a new sweep. Record the differential marker reading in
the corresponding test item of the

"4041 Series Spectrum Analyzer Record Sheet" as the second harmonic
distortion value (4 GHz).
Second harmonic distortion (4 GHz~10 GHz)
7) Connect the test instrument as shown in Fig 11-9 and use a 6.8 GHz low pass filter.
8) Set the frequency of 1464C to 6 GHz and its amplitude to -30 dBm.
9) Set up the spectrum analyzer as follows:
Center frequency 6 GHz
Span ........................................................................................................................................................ 200 Hz
Amplitude ............................................................................................................................................. -30 dBm
Marker ............................................................................................................................................. Markers off
10) Press
【
Peak
】
on the spectrum analyzer. Adjust the power level of 1464C so that the reading of spectrum
Synthesized
signal generator
3.5 mm cable
10 MHz IN
Spectrum
Analyzer
Adapter
Low pass
filter
10 MHz output
Adapter
BNC
cable
Adapter