R3267 Series Spectrum Analyzer Operation Manual (Vol.1)
4.3 Operation of the Gated Sweep
4-7
4.3
Operation of the Gated Sweep
This section describes the gated sweep operation of the analyzer.
The spectrum of a burst signal comprises RF signal spectrums and spectrums caused by on/off operations.
The gated sweep function is especially effective when measuring RF signal spectrum that only depends on
applications.
The gated sweep function measures RF signal spectrum using the signals in steady state (either the burst on
or off period) excluding the signals in transient state (such as leading and trailing edges of the burst signals
to be measured).
In addition, during transient periods, the local oscillator stops sweeping to indicate the spectrum as a contin-
uous spectrum.
Figure 4-6Internal Block Diagram
Two types of gate signals are available in the analyzer.
* External gate signal:
Input signal connected to the EXT GATE connector
* Internal gate signal:
Signal that is generated from the following settings
Trigger source
IF trigger
Envelope of the IF signal (Bandwidth: approx. 10 MHz)
External trigger
Input signal applied to the EXT TRIG connector
Trigger slope
Leading edge
Trailing edge
Gate position
Gate width
The gate position and the gate width of the gate signal are generated in reference to the leading and trailing
Attenuator
Mixer
RBW Filter
IF LOG AMP
VBW Filter
Display section
Detector
Local oscillator
Sweep voltage
D/A converter
Counter
Gate signal
Clock signal
