Filter
Top Products
Appendix C: Algorithms
C–2
TVS600 & TVS600A Command Reference
2. It splits the histogram into two sections at the halfway point between Min
and Max (also called Mid).
3. The level with the most points in the upper histogram is the High value, and
the level with the most points in the lower histogram is the Low value.
(Choose the levels where the histograms peak for High and Low.)
If Mid gives the largest peak value within the upper or lower histogram, then
return the Mid value for both High and Low (this is probably a very low
amplitude waveform).
If more than one histogram level (bin) has the maximum value, choose the
bin farthest from Mid.
This algorithm does not work well for two-level waveforms with greater than
about 100% overshoot.
AUTO attempts to use the MODE method but will switch to the PEAK method if
the histogram does not show an obvious consistent high level. For example, the
MODE histogram operating on a triangle wave would not find significant High
and Low levels so AUTO would select PEAK. On a square wave AUTO would
pick the MODE method.
ABSolute uses the absolute value set with the commands CALCulate:WMPara-
meter:HIGH or CALCulate:WMParameter:LOW.
You can set the various reference levels used to take the automated measure-
ments. You can choose to set reference levels in absolute vertical units or in
relative units of percent or ratio. Use the command CALCulate:WMParame-
ter:RMEThod to choose the reference method. The reference levels are
as follows:
HREFerence the waveform high reference or distal level. Used in fall time and
rise time calculations. In the RELative mode, you use the command CALCu-
late:WMParameter:HREFerence:RELative to set it from 0% to 100%, with a
reset value of 90%. You can set it to a voltage level with the command CALCu-
late:WMParameter:HREFerence.
MREFerence the waveform middle reference or mesial level. In the RELative
mode, you use the command CALCulate:WMParameter:MREFerence:RELative
to set MREFerence from 0% to 100%, with a reset value of 50%. You can set it
to a voltage level with the command CALCulate:WMParameter:MREFerence.
You can also specify a hysteresis value for the MREFerence that reduces the
effects of noise on measurements. The HYSTeresis value is a percent or ratio of
the AMPLitude value.
Measurement Reference
Levels