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8.4.
Time Domain Gate Filtering
Use of time domain gate function can select or filter a specific response in time domain, while the Analyzer can transform the
processed time domain data to frequency domain again for observation. That is to say, after time domain filtering is performed to time
domain data, function of time domain transformation can be turned off, and then frequency domain response of the measured piece
can be observed in the condition that function of time domain is effective. For example, during transmission Measure, eliminate effect
of multi-pass transmission by use of time domain gate, or observe a single time domain response signal at a time and then Analysis
the effect of each single response toward Measure result in frequency domain.
8.4.1.
How to Use Gate Function
In actual Measure, Measure steps with time domain gate function are as follows:
a) Measure the measured piece in frequency domain.
b) witch on time domain transformation function and the Analyzer will calculate time domain response of the measured
piece.
c) Select gate type:
Band-pass: set the gate at the center requiring response reservation, switch on gate function and response outside the gate is
removed from the displayed Measure through mathematical manipulation.
Band-stop: set the gate at the center from which the response is to be eliminated, switch on gate function and response inside
the gate is removed from the displayed Measure through mathematical manipulation.
d) Turn off time domain transformation function, observe frequency domain response of the measured piece and see the
effect of specific response toward Measure result.
Figure below illustrates the Measure application of a band-pass time domain gate:
Fig.8-10 Observing Effect of Single Response toward Measure Result by Use of Time Domain Gate
8.4.2.
Gate Settings
Border and function of the gate can be set and defined as below:
