sync

[adolfoelnew]

Hi,

I am trying to figure out what is the best option for doing the following:

1) Generate a potential signal (which starts a trigger). Currently doing with NI-6501. 

2) Generate a potential and acquire a current. I am using a CHI600D potentiostat, throught the labview interface provided by the company (the code works through the call dll to access the functions).

I need to know what current corresponds with each trigger (sent with the NI-6501). So, first trigger signal I get x1 amps, second x2 amps, and so on.

For that, the signal is sent when I get a certain time multiple from the CHI. So I can trigger every 100ms (for example).

The problem: too slow. I am able to do this each 50ms (roughly). I need to do it every 1ms at least.

I am able to buy whatever hardware I need for doing this simple task. I know the problem is in the way I acquire data from the potentiostat, and recently I found a Keithley 6487 which none was using, and I was thinking of using it instead of the CHI, through a GPIB-USB-HC controller, but not sure. I can also buy another instrument, not a problem.

The question is: how can I sync the trigger with the intensity signal I get?

LabVIEW 2014 SP1 32bit

Win10

Thanks for your time. Any ideas are welcome. 

Cheers,

Yan

[Blokk]

I have never done such task, but I think you should use the Keithley 6487. It comes with LabVIEW driver from Textronix. The given driver ( http://www.tek.com/specialty-instruments/6485-software/models-6485-6487-and-6514-ivi-visa-based-driv... ) .

This Keithley 6487 has a voltage source too and a picoAmp meter part. I think you can do all you want only using this Keithley device, check its driver, it has some LabVIEW examples (like triggering a measurement, etc...).

edit: and yep, buy this interface: https://www.ni.com/en-us/shop/model/gpib-usb-hs-.html

[adolfoelnew]

Hi Blokk,

first of all thanks for replying. 

To explain it a little bit better, I need to control two instruments at the same time. One is the Keithley, to apply apotential and record the intensity (easy). My question was more focused on how I can apply a potential (with the Keithley) while triggering the other instrument (trigger is just apply a TTL signal). The syncronization part is what is not clear to me.

Cheers,

Yan

[billko]

Most isntruments can accept an external trigger.  Is this a possibility?

[adolfoelnew]

Very good point Billlko! Yes, just checked and has a trigger link. Just need to figure out how it works now, maybe this could be the easiest solution.

Cheers!

Yan

[Blokk]

Download the manual, and read it. It has the required info...

[adolfoelnew]

Well Blokk, that is obvious...