IV curve for using USB-6009

[Brandon1026]

Hi, I would like to ask how to generate an IV and PV curve for using NI USB-6009 in labview. 

[GerdW]

Hi Brandon,

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@Brandon1026 wrote:

Hi, I would like to ask how to generate an IV and PV curve for using NI USB-6009 in labview. 

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The NI6009 is a rather simple DAQ device and can only measure voltages.

It offers just 2 AO channels, but can only output voltages (0…5V range) with 5mA max.

So you cannot output a defined current while you would be able to measure a voltage signal.

The "P" in "PV" typically is easy to determine by using simple math: P=UI…

Recommendations:

1. Write down your requirements and choose DAQ hardware fitting to them…
2. You may work with shunt resistors (by applying simple rules by Kirchhoff and Ohm), but using them might influence the behaviour of your DUT.

[andcadev]

Hi,

First, you can use a shunt resistor and measure the voltage across the resistor itself. This voltage is an indirect measurement of the current through the resistor and through your DUT ( I = V/R Ohm's law). As others suggested, you should be sure that the shunt resistor influence you device under test as little as possibile.

Note: for measuring the voltage across the shunt resistor, you can do a differential reading (Differential Measurement System - NI).

[Brandon1026]

hi, does you mean like that as below picture shown?

[Brandon1026]

this is my VI file

[Brandon1026]

This is my VI file

[GerdW]

Hi Brandon,

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@Brandon1026 wrote:

hi, does you mean like that as below picture shown?

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No.

(Why do you attach a downscaled image of the block diagram?)

• Please don't use the DAQAssistent, use plain DAQmx functions instead. See all those example VIs in the example finder to learn them! (Or read this article!)
• Don't use those blueish DDT wires, that come with the DAQAssistent ExpressVI: they don't help to understand their data content/format!

Please start over with learning basics, by looking at all those example VIs. There are examples for reading voltages, and there are examples on how to use charts and graphs!

There's no VI in your other message…

Please downconvert your VI before attaching. Most prefer LV2021 or older, I prefer LV2019…