A SERVICE OF

logo

Open as PDF
next previous
Appendix B: Algorithms
TDS 684A, TDS 744A, & TDS 784A User Manual
B–7
2. From this sample, continue the search to find the first (negative) crossing of
HighRef. The time of this crossing is THF. (Use linear interpolation if
necessary.)
3. From THF, continue the search, looking for a crossing of LowRef. Update
THF if subsequent HighRef crossings are found. When a LowRef crossing is
found, it becomes TLF. (Use linear interpolation if necessary.)
4. FallTime = TLF – THF
High
HighRef
LowRef
Low
TLFTHF
Fall Time
Figure B–2: Fall Time
Timing measurement. The reciprocal of the period. Measured in Hertz (Hz)
where 1 Hz = 1 cycle per second.
If Period = 0 or is otherwise bad, return an error.
Frequency = 1/Period
100% (highest) voltage reference value. (See High, Low on page B–1.)
Using the min-max measurement technique:
High = Max
Frequency
High