process interval between novalues

[CaseyLamers1]

I have a channel that has timestamp data while a test is running properly and NoValues when it is not.  I want to find the total time between each set of NoValues in the channel.  I have tried using conditional statements with the ChnSum command and the procssing NoValues dialog box but have not been able to produce the results I would like.

[Walter_Rick]

Hi CaseyLamers1,

you need the following steps:

• calculate relative time (in seconds)
• create a channel which contains just NoValues or 1
• calculate a channel with relative time and NoValues
• accumulate the relative channel to get the all over time
• accumulate the relative time with NoValues to get minus Novalue times
• calculate the all over NoValue time

The script example is attached.

Greetings

Walter

[CaseyLamers1]

Walter,

Thank you for your response.  You gave me the insight I needed to solve the problem.  Below is the script that returned the values I needed from the test data you produced:

' calculate relative time (in seconds)
Call ChnOffset("[1]/TimeGenerated","/Offset",0,"first value offset")

' create a channel which contains just 0 or 1
Call Calculate("Ch(""[1]/Result"") = IIf( IsNull( Ch(""[1]/LinearGenerated"")), 0, 1)")

' calculate a channel with relative time and zeroes
Call ChnMul("[1]/Offset","[1]/Result","/Multiplied1") ' This is the starting point for my data for processing my data

' find all of the times right before there were NoValues
Call ChnPeakFind("[1]/TimeGenerated","[1]/Multiplied1","/PeakX","/PeakY",,"Max.Peaks","Time")

' add a zero to the first line of the generated channel
Call ChnGenVal("[1]/PeakY",1,1,0,0,0)

' calculate the relative time between NoValue occurrences
Call ChnDeltaCalc("[1]/PeakY","/Delta")

I will then pull this channel into a report with probably some statistics applied to it.