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Measure the time difference between a digital output and a responding analog input

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Hallo,

 

I use the following system:

  • NI PXI-1044 with NI PXI-8109 controller
  • NI PXI-2564 switch module to turn the power of my tested device on
  • NI PXI-6259 multifunction DAQ to measure the responding signal jump

Both cards are at the same PXI-trigger-bus. For both, PXI-2564 and PXI-6259 I use DAQmx to program reading and writing the channels.

Now I want to measure the time delay between the digital output, that switches my device on and the analog input, that measures the reaction of my system.

 

I can't get it to work by myself, please help me!

 

Thank Ludwig.

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Hi Ludwig,

 

what have you tested so far?

Do you have any VIs which you can upload for us?

 

Best regards,

Abduelkerim

Sales
NI Germany
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Message 2 of 7
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The M-Series synchronisation mechanism dosn't work.

 

I don't know if a could address the PXI-trigger-bus directly?

 

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I did understand your problem.

 

But you said: "I can't get it to work by myself"

 

Therefore, you definitely have build some VIs. I would like to see them

Abduelkerim

Sales
NI Germany
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Message 4 of 7
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I have not any VIs. I had one but with every error I changed it to try other things. Because of no usable result I didn't saved anything.

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Solution
Accepted by Ludwig72

Hi Ludwig,

 

if you can't give us any VI we have difficulties with helping you.

Because I donÄt know how your programm is build up it is not easy to tell where you should grip signals.

 

Here is a similar question to yours:

http://forums.ni.com/t5/LabVIEW/Best-way-to-measure-time/td-p/178704

 

and 2 external links:

 

http://www.ehow.com/how_8698983_measure-time-labview.html

 

http://objectmix.com/labview/385152-how-can-i-use-labview-measure-time-between-analog-pulses.html

Abduelkerim

Sales
NI Germany
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Hi Abduelkerim,

 

thank you for your help.

I wish, there was a function to use the PXI trigger bus to synchronize measurements.

Timer and Timestamps are not the exactest but an usable way.

 

Ludwig.

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