Measurement script

[KIS]

Hello

I want to measure the peak time of the waveform,

the time at the start, and the end time.

What should I do now?

The waveform has only one peak.

Please see the attached file.

Thank you.

waveforms q.pdf

[attila]

Hi @KIS

The rise/fall time measurements represent the 10-90% trip.
You could use the cursors to measure the full trip or write a custom measurement.

[attila]

Hi @KIS

It is easier to write and print multiple measurements in Script tool. 
This code is working only for one pulse. You may need to use a bit higher value than low... 

Channel = Scope.Channel1
Time = Scope.Time

data = Channel.visibledata
cnt = data.length
imax1 = 0
imax2 = 0
max = -1e6
for(var i = 0; i < cnt; i++){
    v = data[i]
    if(max==v){
        imax2 = i
    }else if(max<v){
        max = v
        imax1 = imax2 = i
    }
}
low = Channel.measure("Low")
imax = (imax1+imax2)/2

istart = imax;
while(istart>0 && data[istart]>low) istart--

iend = imax
while(iend<cnt && data[iend]>low) iend++

print("low:",low, "max:",max, "istart:",istart, "imax:",imax, "iend",iend)
print("max at:",Channel.TimeOfVisibleIndex(imax), "dRise:",(imax-istart)/Time.Rate.real, "dFall:",(iend-imax)/Time.Rate.real)

 

You could split it in different measurement(s) like this:

data = Channel.visibledata
cnt = data.length
imax1 = 0
imax2 = 0
max = -1e6
for(var i = 0; i < cnt; i++){
    v = data[i]
    if(max==v){
        imax2 = i
    }else if(max<v){
        max = v
        imax1 = imax2 = i
    }
}
low = Channel.measure("Low")
imax = (imax1+imax2)/2

istart = imax;
while(istart>0 && data[istart]>low) istart--

iend = imax
while(iend<cnt && data[iend]>low) iend++

100.0*(imax-istart)/(iend-istart)

 

 

 

Edited December 20, 2021 by attila

[KIS]

Thank you for teaching. This is very helpful.

[Sakshi Verma]

Measurement has to be done very accurately as its values and results are responsible for major decision making activities. While writing any measurement script it is very important to understand what is the process and goal of the measurement.

A particular measurement tool is a scientific instrument that is used to monitor and observe the different attribution of the object. 

Before start creating any measurement script it will be a great idea to understand the few basics of measurement.

[Holden Veronese]

Hey thanks for the super helpful reply. I'm not sure how I missed that thread. I haven't quite mastered the search function on here. I think I'll pass with him this time around. If i want any further guideline we will contact you here https://forum.digilent.com/topic/22499-florida-measurement-script/.

Thanks