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In the narrow-band measurement mode of the spectrum analyzer:
peak pulse power =(main lobe amplitude) -(20 log T
eff
/T)
Where:
Teff -pulse width, in second. Second
T——pulse repetition frequency
The phenomenon in which the peak pulse power is not equal to the main lobe amplitude is known as pulse
desensitization. The sensitivity of the spectrum analyzer will not be decreased by the pulse signal. Accurately, pulse
desensitization is caused by distribution of the CW carrier power of pulse modulation to a number of spectrum
components (i.e. carrier and sideband). Therefore, each spectrum only contains part of the total power.
9 Signal source measurement (option)
The signal source measurement mode includes independent source output mode and generator output mode,
of which the independent source mode is point frequency source mode to realize the signal output at single
frequency point and fixed power, and the generator output mode needs to coordinate with spectral analysis
function. Under the generator mode, the signal source will scan synchronously with the frequency under
spectral analysis.
1) Independent source measurement
Under the independent source measurement mode, it is allowed to realize the signal output at fixed
frequency by the following steps:
a) Press [Measure]→[Generator]→[Generator Off On], the point frequency source output will be
selected by default after the Generator switch is turned on;
b) Press [Measure]→[Generator]→[Output Power 0dBm], it is allowed to set the power of output
signal.
In measurement of the main lobe amplitude, you should change the attenuator of the spectrum analyzer and verify that the main lobe amplitude will not
change accordingly. If the change exceeds 1dB, it indicates that the spectrum analyzer is in the gain compression state. In this case, you must increase
the attenuation amount of the attenuator.