keithley 6220 trying to use "Set Current Level.vi"

[ak15]

Hi,

I am trying to use the "Set Current Level.vi" given by Keithley. But the VI isn't working. When I enter a current level the output stays zero. Only the decimal point and the current range are set correct. I tried to locate the problem, but I am new in LabVIEW and can't find it.

for example, when i enter 10.000mA the output is 00,000mA

Can someone help me please?

thx

andre

[mikeporter]

The problem is you don't understand what you are setting. The 6220 us a current source and so it has no control over how much current an external sink draws. That is a function is the DC characteristics of the external circuitry.

All the 6220 can control is how much current it will allow the circuit to draw before it goes into current limiting. What you are setting is a limit so you won't see a difference unless your circuitry starts bumping up against it.

By the way in general there are two possible responses to an over current condition. The source can crowbar, which means it turns off the output, or it can go into current limiting where is starts dropping the output voltage until the current limit is reached.

Mike...

[ak15]

Found the mistake, I had some issues with the setup of LabVIEW. The "Set Current Level.vi" use decimal points, but LabVIEW was set to use comma.

[mikeporter]

So were you ignoring the syntax errors the instrument was returning?

Mike...

[ak15]

the instrument never returned a synatx error before, this is why I was searching for a mistake in the VI