Current versus Time acquisition

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Mon, 01/23/2012 - 07:17 am

Hello,
I am a beginner on Igor, and I want to record and display a current vs time signal. I believe all I need is the LIH_ functions to make an operational procedure but I have never done that and I am lost and I can really use some support.
I just acquired a Heka EPC 800 with an LIH 8+8 acquisition card.
In fact I just need to impose a constant voltage and measure and record the resulting current of the system. Does someone have a lead to provide me or at least the beginning of one.
Thank you in advance
Ok, this step is done, as the intalling one.
I've tested my set-up with the model circuit and the example provided by LIH_XOP (ContinousRecording), everything seems to be operational.
But when I write my own procedure to impose a constant voltage and record the current, I create waves full of ununderstandable data. May you have an example code (different than the help one) that would help me using the LIH_StimAndSample function for example?
I've tried this, does it seems reasonable?

#pragma rtGlobals=1     // Use modern global access method.

Function CourrentTime()

variable initialisation
variable AD_0_voltage
variable AD_1_voltage
variable Voltage_impose
variable InterEchantillonnage
variable Intervalle_echantillonnage_us
variable success
variable success0


Intervalle_echantillonnage_us=10
InterEchantillonnage= Intervalle_echantillonnage_us/1000000
Voltage_impose = 0.1

initialisation=LIH_InitInterface(3)

if (initialisation != 0)
    print "Initialisation ratée!"
else
    print "Initialisation réussie!"
endif

Make /D/N =(20000) stimulation
Make /D/N =(20000) lecture
Make /D/N =(20000) lecture0

stimulation=voltage_impose

success = LIH_SimpleStimAndSample (stimulation, lecture, InterEchantillonnage, 1, 3, 1)
success0 = LIH_SimpleStimAndSample (stimulation, lecture0, InterEchantillonnage, 1, 4, 1)

Display lecture
Display lecture0

end

January 24, 2012 at 07:11 am - Permalink

I downloaded the LIH XOP from Heka and according to their documentation it looks like your code is using their function correctly. You haven't made it clear to me what the problem is. How is the data "ununderstandable"? It might help if you could post an Igor experiment containing the data that you are getting in.

It may be easier (and faster) if you send your experiment with an explanation to support@wavemetrics.com. I have not used the LIH XOP before but I have a lot of experience using the ITC-18 and the older style XOP and so I may be able to help you figure out how to get started.

January 24, 2012 at 07:32 am - Permalink