Filter
Top Products
Appendix C: Algorithms
TVS600 & TVS600A Command Reference
C–15
Timing measurement. Time taken for the leading edge of a pulse to rise from a
L owRef value (default = 10%) to a HighRef value (default = 90%).
Figure C–3 shows a rising edge with the two crossings necessary to calculate a
rise time measurement.
1. Based on the index n specified by the CALCulate:WMParameter:EDGE
command, count edges according to the following rules:
H Positive arguments search forward from the start-to-end of the waveform
record; zero and negative arguments search backward from the end-to-
start.
H Zero specifies the last edge in the waveform record.
H Count only edges that go through both HREF and LREF (see Fig-
ure C–2).
2. Continue the search process until the n
th
positive-going edge is found (user
specifies n using the CALCulate:WMParameter:EDGE command).
3. Find the time of the HREF crossing for the n
th
edge. This time is THF. (Use
linear interpolation if necessary.)
4. Find the time of the LREF crossing for the n
th
edge. This time is TLF. (Use
linear interpolation if necessary.)
5. RiseTime = THR – TLR
High
HighRef
LowRef
Low
THRTLR
Rise Time
Not an edge
Figure C–3: Rise Time
Amplitude (voltage) measurement. The true Root Mean Square voltage.
Rise Time
RMS: