Tektronix TDS 500C, TDS 600B, TDS 700C Frequency High

Appendix B: Algorithms
TDS 500C, TDS 600B, & TDS 700C User Manual B–9
High
HighRef
LowRef
Low
TLFTHF
Fall Time
Figure B–2: Fall Time
3. From , continue the search, looking for a crossing of . Update
 if subsequent  crossings are found. When a crossing is
found, it becomes . (Use linear interpolation if necessary.)
4.  =  – 
Timing measurement. The reciprocal of the period. Measured in Hertz (Hz)
where 1 Hz = 1 cycle per second.
If  = 0 or is otherwise bad, return an error.
 = 1/
100% (highest) voltage reference value. (See High, Low on page B–1.)
Using the min-max measurement technique:
 = 
Frequency
High