time measurement between counter output my device and analog input

[jolly jumper]

Hello!

I'm trying to measure the time to generate a digital pulse train on the counter output, that goes to a frequency converter that controls a motor.  So I think it'd be the best way to wire the output of the frequency converter with an analogue input and make a timestamp before I generate the pulse and a timestamp when I recognize the singal, but I think that wouldn't be a serious measurement :)?

What's the best way to measure the time?

kind regards peter

[chrisger]

hi there

well, there a several ways to do this. the problem with the software - timestamps is the minimal resolution of 1ms. i'd suggest:

- wire a copy of the digital pulse train to an analog input channel
- wire a copy of the frequency converter to another analog input channel
- create an analog input task with the two channels (the sampling rate defines the timing resolution,make sure to acquire enough samples to see the response signal) 
- start this task
- send the digital pulse train

to optimize your acquisition you can use another copy of the digital pulse train as a start trigger for your analog acquisition.

-> then you'll see the digital pulse train on one of the analog channels and the frequency output on the other one. both channels have the same time axis with a resolution defined by your sampling rate (~us depending on your hardware). then you can analyze the data.

search the example finder for examples of how to create tasks and triggers.

[jolly jumper]

hey chris,

thank you for your reply, but I have decided to prefer the oscilloscope and do the measurement without labview! I think that's the easier way 😉

Kind regards Peter

[chrisger]

yeah, that's surely correct!

but make sure that the device is stable and that the delay dosn't depend from the pulse train.