Tektronix TDS 410A User Manual

Appendix B: Algorithms
Appendices
AĆ18
If the target waveform leads the reference waveform, phase is positive; if it
lags, negative.
Phase is not available in the Snapshot display.
Positive Duty Cycle
Timing measurement. The ratio of the positive pulse width to the signal peri-
od, expressed as a percentage.
PositiveWidth is defined in Positive Width, following.
If Period = 0 or undefined then return an error.
PositiveDutyCycle =
PositiveWidth
Period
100 %
Positive Overshoot
Amplitude (voltage) measurement.
PositiveOvershoot =
Max * High
Amplitude
100 %
Note that this value should never be negative.
Positive Width
Timing measurement. The distance (time) between MidRef (default = 50%)
amplitude points of a positive pulse.
If MCross1Polarity = ‘+’
then
PositiveWidth = (MCross2 – MCross1)
else
PositiveWidth = (MCross3 – MCross2)
Rise Time
Timing measurement. Time taken for the leading edge of a pulse to rise from
a LowRef value (default = 10%) to a HighRef value (default = 90%).
Figure A-3 shows a rising edge with the two crossings necessary to calculate
a Rise Time measurement.
1. Searching from Start to End , find the first sample in the measurement
zone less than LowRef .
2. From this sample, continue the search to find the first (positive) crossing
of LowRef . The time of this crossing is the low rise time or TLR . (Use
linear interpolation if necessary.)

Tektronix TDS 410A Specifications

General

Brand	Tektronix
Model	TDS 410A
Category	Test Equipment
Language	English