Ceyear 4041 Series, User Manual

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Chapter XI Performance Characteristics Test
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10) Record the differential marker amplitude reading of the spectrum analyzer; carry out the following
calculation (reading of the differential marker amplitude of the spectrum analyzer - current set reference
level), and record the calculated value as the current reference level uncertainty in the corresponding test item
of the 4041 Series Spectrum Analyzer Record Sheet .
11) For remaining settings of the residual reference level of the spectrum analyzer listed in the corresponding test
item of the 4041 Series Spectrum Analyzer Record Sheet , repeat steps 7~9.
11.15 Scale fidelity
Description: The scale fidelity is the error between the vertical scale and the theoretical value on the screen of the
spectrum analyzer, which is used to evaluate the linearity of the analog-digital converter of the spectrum analyzer.
Test the scale fidelity under conditions of 10 dB/division, and test with the resolution BW set to 10 Hz and the
start amplitude of the input signal at 0 dBm reference level. When the signal amplitude is reduced, the displayed
signal amplitude is compared with the reference level. The spectrum analyzer provides 10 MHz reference
frequency for the signal generator.
A) Testing equipment
Signal generator ........................................................................................................................................... 1464C
Power meter ........................................................................................................................................... ML2437A
Power sensor .......................................................................................................................................... MA2445D
Power divider ................................................................................................................................................ 81313
b) Adapter
2.4 mm (f)-2.4 mm (f) adapter * 1
c) Cable
BNC (m-m) cable * 1
2.4 mm (m-m) cable * 1
d) Test steps
1) Connect the power meter and the power probe and zero them, and set the calibration factor frequency to 50
MHz.
2) Connect the test device according to Fig 15. The spectrum analyzer provides the reference frequency for the
synthesized signal generator 1464C, and the output of the signal source is connected to the RF input port of
the spectrum analyzer and the power probe respectively through the power divider.
3) Set up the spectrum analyzer as follows:
Center frequency ...................................................................................................................................... 50 MHz
Reference level .......................................................................................................................................... 0 dBm
Marker ............................................................................................................................................................ Off