Ceyear 4041 Series, User Manual

Page: 176 / 203

Chapter XI Performance Characteristics Test
164
18) Activate the limit line function and set the limit at -80 dBm. The noise level shall be at least 5 dB below the
limit line. If not, it is necessary to reduce the noise level by reducing the resolution BW and video BW.
19) Observe whether there is residual response signal on the noise baseline of the spectrum analyzer. If there is
residual response signal, read the residual response amplitude with the marker and record the measurement
results. During the test, make the residual response signal amplitude 10 dB higher than the displayed average
noise level at least. If the residual response signal amplitude is smaller, further reduce the resolution BW to
reduce the displayed average noise level.
20) Change the center frequency according to [Frequency [Center Freq]
【 ↑ 】
. Repeat step 19. Check the residual
response of the frequency to 44 GHz when the preamplifier is off, and record the tested maximum response
value in the corresponding test item in the 4041 Series Spectrum Analyzer Record Sheet .
11.14 Reference level
Description: The calibrated vertical scale position on the screen of the spectrum analyzer is used as a reference
for amplitude measurement, and the reference level usually indicates the top division of the scale. The switch of
the reference level can cause gain/attenuation linkage. The reference level switch error is used to evaluate the
error of the switch gain of the spectrum analyzer.
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