Find Peaks of individual cycle pressure

[Durai26]

Hi,

Is there a way to find the individual peak values [ highlighted in red] of each cycle pressure and store all peak values in new channel.

Also want to record its corresponding crank angle in an another new channel.

sample image below:

X: crank angle

Y: pressure

something like,

Index	Peak values channel	Crank angle channel
1	y1	x1
2	y2	x2
3	y3	x3
4	y4	x4

thanks,

Durai

[DJacques]

Hi,

You can try this line of code:

' Calculate the interval size PeakWdwPct, as a % of the recording duration (input to ChnEnvelopes function)
Dim RecordingDuration, PeakWdwPct
RecordingDuration = (oChn.Size-1) * oChn.Properties("wf_increment").Value
PeakWdwPct = PeakWdwDuration/RecordingDuration*100 ' [%]
Call ChnEnvelopes("",oChn,Grp_Name & "/UpperX_" & Chn_Name,Grp_Name & "/UpperY_" & Chn_Name,Grp_Name & "/LowerX_" & Chn_Name,Grp_Name & "/LowerY_" & Chn_Name,PeakWdwPct)

Where PeakWdwDuration is the expected period between 2 peaks, in seconds.

oChn is a waveform channel object

Jacques