Ceyear 4041 Series, User Manual

Page: 180 / 203

Chapter XI Performance Characteristics Test
168
Fig 11-16 Total Level Uncertainty Testing Setup
1) Connect the power meter and the power probe and zero them.
2) As shown in Fig 16, connect the outputs of the test device and the signal generator with the SUM port of the
power divider, and connector the PORT1 port and PORT2 port to the RF input port and power probe of 4041
spectrum analyzer respectively.
Total level uncertainty (change the attenuator setting)
3) Set the frequency of 1464C to 50 MHz and the amplitude to -15 dBm after reset.
4) Set up the spectrum analyzer as follows:
Center frequency ...................................................................................................................................... 50 MHz
Span ........................................................................................................................................................ 100 kHz
Reference level ....................................................................................................................................... -10 dBm
Resolution bandwidth ................................................................................................................................. 1 kHz
Video bandwidth ....................................................................................................................................... 100 Hz
5) Adjust the output signal amplitude of the signal generator to make the power meter reading be -25 dB.
6) Set the spectrum analyzer marker to the peak value, read the level L displayed by the spectrum analyzer marker
and the test reading L
power meter
of the power meter. Calculate the total level uncertainty
△
L as follows:
L L L
  
功率计
(7)
Record the calculated
△
L as the test result of the total level uncertainty in the 4041 Series Spectrum Analyzer
Record Sheet .
7) Repeat step 6 to test the total level uncertainty indicator when the attenuation value of the internal
programmed step attenuator is 10 dB and 20 dB.
8) Set the reference level of the spectrum analyzer to 20 dBm, and change the output power level of the signal
generator to make the power meter reading be -5 dBm.
9) Repeat step 6 to test the total level uncertainty indicator when the attenuation of the programmed step
BNC cable
Synthesized signal
generator
Spectrum
Analyzer
Adapter
10 MHz output
10MHz IN
2.4 mm cable
Power meter
Sensor
Power divider