Photocurrent at V=0

[lacorgui]

Dear mates,

I´ve got a question, I´ve got a problem that´s killing me softly and I need your help if it would be possible. 

The question is how to program a Keithley 2400 in order to get photocurrent at 0 volts. That is: I must indicate a V=0 and it has to give me a current for this V. 

It seems to me easy to do but I´m not able to get it, so any help is welcome! 

Thanks all!! 

[nyc_(is_out_of_here)]

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@lacorgui wrote:

Dear mates,

I´ve got a question, I´ve got a problem that´s killing me softly and I need your help if it would be possible. 

The question is how to program a Keithley 2400 in order to get photocurrent at 0 volts. That is: I must indicate a V=0 and it has to give me a current for this V. 

It seems to me easy to do but I´m not able to get it, so any help is welcome! 

Thanks all!! 

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Looking at your other posts, it seems your mode of operation is not to have attempted anything on your own and ask someone else to provide you with the solution.

[GerdW]

Hi lacorgui,

as K2400 operates as SMU (source measure unit) you can have it source either zero Volts or a suitable small voltage like 1mV. Then you read the current needed to source that voltage…

[pjr1121]

The exact scenario of sourcing voltage and measuring current is given in numerous examples in the Keithley 2400 Manual (step by step instructions).  Go look at it for 30 minutes (free on Keithley website).

And a tip, you'll need to be in 4 wire sense mode (compensates for resistance of wires leading to your devices assuming all 4 wires run the full distance from SMU to the devices in question).

[lacorgui]

nyc, I got a big program for IV curves not because someone made it for me but using some helpful tricks from the forum. I do not pretend others make my job, it is just that I do not know how to solve this. Anyway, thank you for your time.

[lacorgui]

Thanks GerdW and pjr1121. Some months ago I was able to get sweep measurements using multiple points, however now I am not able to make a simple measurement. I´m trying to reproduce some examples, so let´s see if they work. Maybe it is I´m not lucky these days. 

[nyc_(is_out_of_here)]

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@lacorgui wrote:

nyc, I got a big program for IV curves not because someone made it for me but using some helpful tricks from the forum. I do not pretend others make my job, it is just that I do not know how to solve this. Anyway, thank you for your time.

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Post your VI.

There is no law against it.

[lacorgui]

http://forums.ni.com/t5/LabVIEW/Entering-continuously-measured-data-into-same-file/m-p/3013245#M8616...

I don´t wanna bother anybody, so my apologies. 

[Dennis_Knutson]

You don't have any code in that link. What is the point of mentioning it?

[lacorgui]

In that post I was just trying to help someone else. 

I do not want to carry on with this "fight". 

It was a pleasure to learn from that people who helped me. I will try other methods to improve my knowledge in this area.