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1
number
－
＝
ot
scanningsp
timespan
olution
Displayres
Display resolution can be improved with two methods below:
Reduce time span.
Increase Sweep spot number.
Figure below provides the Measure result of the same measured piece in different time spans with 201 Sweep spot number.
Resolution of 50 psec can be obtained within time span of 10nsec.
Resolution of 12.5 psec can be obtained within time span of 2.5nsec.
Fig.
8
-5 Display Resolution
8.2.3.
Measure Range
In time domain Measure, Measure range can be defined as the maximum time span set and no repeated response will occur within
this time span when performing Measure.
Measure range has an inverse relationship with response resolution; one increase, the other will be reduced.
Time domain waveform is the periodic signal repeating with time, thus repeated response will occur. Repeated response (false
response) is not true response of the measured piece and it only appears at specific time interval (1/frequency interval of Sweep
spots), hence Measure range is determined by frequency interval
△
F of Sweep spots:
Fig.
8
-6 Frequency Interval Definition of Sweep Spots
When performing time domain Measure, maximum terminal time that can be set is: 1/
△
F, Measure range is in direct scale to Sweep
