Ceyear 4041 Series, User Manual

Page: 62 / 203

Chapter IV Spectrum Analyzer Mode
50
Fig 4-23 Pulse width displayed by marker
3) Measurement of pulse repetition frequency (PRF)
The pulse repetition frequency (PRI) is the time interval between any two adjacent pulse responses.
a) Set the signal generator output signal:
Set the signal generator frequency at 1 GHz and signal power at -20 dBm, and connect the signal generator output
to the input port of spectrum analyzer. Set the pulse modulation to the repetition frequency of 1 kHz, pulse width
of 1 us, and activate the pulse modulation and RF output.
b) Set the spectrum analyzer:
Press
【
Preset
】
key.
Press
【
Freq
】
, 1 [GHz].
Press
【
Span
】
, 10 [MHz],
【
Sweep
】
, [Sweep Time Auto Man], 1.705 [s].
Press
【
BW
】
, [Res BW Auto Man], 1 [kHz].
Press
【
BW
】
, [Video BW Auto Man], 3 [MHz].
Press
【
BW
】
, [Detector], [Peak] to activate the positive peak detection.
Adjust the span to display the main lobe and at least a pair of sidelobes on the screen.
Readjust the output amplitude of the signal generator to display it on the screen, and reduce the sweep time (i.e.,
quicken the scan speed) until the display is similar as that shown in Fig 4-24.
c) Measure the pulse repetition interval.
Press
【
Sweep
】
, [Sweep Type Cont Single].
Press
【
Peak
】
,
【
Marker
】
, [Detla],
【
Peak
】
, [Next Pk]. The difference of the two displayed markers equals the