Ceyear 4041 Series, User Manual

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Chapter XI Performance Characteristics Test
139
accuracy of spectral analyzer with an input signal of a known frequency, which represents the degree of difference
between the test value and true value. The smaller the difference is, the higher the accuracy is.
A) Testing equipment
Synthesized signal generator 1464C
b) Adapter
2.4 mm (f)-2.4 mm (f) adapter * 2
c) Cable
2.4 mm(m-m) cable (1)
d) Test steps
Fig 11-2 Test block diagram of frequency readout accuracy
1) Connect the test instrument as shown in Fig 11-2, and connect the RF output of signal generator to the RF input
of spectrum analyzer.
2) Press the reset button on the signal generator, set the output frequency f
0
of the signal generator according to
the
“
frequency readout accuracy
”
item in the 4041 Series Spectrum Analyzer Record Sheet and the power level at
-10 dBm, and turn on the RF output switch.
3) Set the spectrum analyzer as follows: center frequency: f
0
, span: 500 kHz, reference level: 0 dBm; the RBW,
sweep time, etc. are set automatically.
4) Press
【
Peak
】
on the spectrum analyzer to read the frequency f
s
of peak signal with marker.
5) Calculate the frequency reading error Δf according to equation (1):
Δf=f
s
-f
0
（
1
）
6) Record Δf as the test result in the corresponding item in the 4041 Series Spectrum Analyzer Record Sheet.
7) Repeat the 2nd ~ 6th steps according to the combination of frequencies and spans in the 4041 Series Spectrum
Analyzer Record Sheet.
11.3 Span accuracy
Description: Two signals of the known frequency provided by two synthesized signal generators are taken as the
input to the spectrum analyzer. Set the center frequency of spectrum analyzer as the intermediate value of these
two frequencies. Measure the frequency difference between these two signals with the marker function. Calculate
Synthesized
signal generator
Adapter
2.4 mm cable
Adapter
Spectrum
Analyzer