Ceyear 4041 Series, User Manual

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Chapter XI Performance Characteristics Test
163
reduce the displayed average noise level.
12) Change the center frequency according to [Frequency [Center Freq]
【 ↑ 】
. Repeat step 11. Check the residual
response of the frequency to 13 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 .
Residual response, 13 GHz~20 GHz (preamplifier off)
13) Set up the spectrum analyzer as follows:
Center frequency ....................................................................................................................................13.055 GHz
Frequency step ........................................................................................................................................... 100 MHz
Span ........................................................................................................................................................... 110 MHz
Reference level ........................................................................................................................................... -20 dBm
Preamplifier ........................................................................................................................................................ Off
Resolution bandwidth ................................................................................................................................... 10 kHz
Video bandwidth ............................................................................................................................................. 3 kHz
14) Activate the limit line function and set the limit at -85 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.
15) 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.
16) Change the center frequency according to [Frequency [Center Freq]
【 ↑ 】
. Repeat step 15. Check the residual
response of the frequency to 20 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 .
Residual response, 20 GHz~44 GHz (preamplifier off)
17) Set up the spectrum analyzer as follows:
Center frequency ....................................................................................................................................20.055 GHz
Frequency step ........................................................................................................................................... 100 MHz
Span ........................................................................................................................................................... 110 MHz
Reference level ........................................................................................................................................... -20 dBm
Preamplifier ........................................................................................................................................................ Off
Resolution bandwidth ................................................................................................................................... 10 kHz
Video bandwidth ............................................................................................................................................. 3 kHz