Tektronix TDS 500C User Manual

Appendix B: Algorithms

TDS 500C, TDS 600B, & TDS 700C User Manual

MCross1, MCross2, and MCross3 — refer to the first, second, and third 

cross times, respectively. (See Figure B–1.)

The polarity of the crossings does not matter for these variables, but the
crossings alternate in polarity; that is, 

 could be a positive or negative

crossing, but if 

 is a positive crossing,  will be a negative

crossing.

MidRef + (Hysteresis x Amplitude)

MidRef – (Hysteresis x Amplitude)

MidRef

MCross1

(StartCycle)

MCross2

MCross3

(EndCycle)

The oscilloscope calculates these values as follows:

1. Find the first 

 in the waveform record or the gated region.

This is 

.

2. Continuing from 

, find the next   in the waveform

record (or the gated region) of the opposite polarity of 

. This is

.

3. Continuing from 

, find the next   in the waveform

record (or the gated region) of the same polarity as 

. This is

.

MCross1Polarity — is the polarity of first crossing (no default). It can be rising or
falling.