NI 9265 Current Resolution

[p.v.o]

Hi,

just for information: I am a beginner in LabView.

During my internship I got the order to build a prototype for component tests.

So I need to automatically increase the supply current for the components until a certain level (probably around 5 to 6 mA) is reached. Then I'll get a digital input as feedback from the component which I want to use to stop the increase. The same thing has to be done by decreasing the current to detect not just the level but the hysteresis as well. I need to report both values for each component.

The increase or decrease steps should be around 0,05 to 0,1mA.

I already have the cDAQ 9188, therefore I want to use the NI 9265. But I'm not quite sure if the resolution (16-bit) is suitable for me.

The minimum step which is possible should be

(20*10^-3) / (2^16) = 305,17.... nA.

Am I right?

I tried some examples but everything I found was a 1mA step as the minimum value.

Thanks for help and advice in advance.

Cheers,

Pascal

[Stephan_D]

Hey Pascal

according to the data sheet:

NI 9265 Datasheet - 374067a_02.pdf
http://www.ni.com/pdf/manuals/374067a_02.pdf

the step size for the 9265 0-20mA current output module is

20mA/2^16 = 0,00030517mA = 0,30517uA

But you have to take the accuracy (gain and offset) as well as the temparature into account.

Regards, Stephan