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Fig.
8
-19 Low Pass Step Measure Results of Different Cables
The left Measure:
response of the bending cable with capacitive discontinuous points.
The right Measure:
response of the wearing cable with inductive discontinuous points.
8.5.6.
Transmission Measure in Low Pass Mode
Horizontal axis data:
Average transmission time during which the signal passes the measured piece in a frequency range.
Average Electrical delay of the measured piece.
Vertical axis data:
In logarithm amplitude format, it represents transmission loss and gain (limited to impulse mode only).
An example of low pass step response of amplifier is provided below:
Fig.
8
-20 Low Pass Step Measure Results of Amplifier
Average group delay within Measure frequency range is the differential value between step and amplifier response.
Step rise time is directly related to highest frequency of frequency domain sweep, the higher the frequency, the shorter the rise
time is.
Ringing of amplifier response indicates that it is underdamped design.
8.6.
Band Pass and Low Pass Time Domain Modes
When setting time domain Measure, transformation mode must be selected first and this section will make comparison between band
pass and low pass Measure modes.
8.6.1.
Modes Comparison
8.6.1.1.
Band pass mode
Easiest use.
Very applicable to Measure of band pass instruments not working to direct current.