Project help for a class

[Paddle_to_the_sea21]

Hey everyone, 

So for a project for a class that I am taking we are to create a LabVIEW program with the DAQ card (SCC 68) to measure the current voltage characteristics for a non linear device. Since the DAQ card cannot supply enough circuit for the nonlinear device (such as a lamp), we have to make a circuit that allows us to amplify the current. Additionally, there should be some signal conditioning incorporated into this so that we are able to use a certain start and end current + being able to control the number of points + time between points. When it comes to projects like this I have no experience with using a DAQ card / have been trying to learn it over the course of the past few days but still having some trouble. To make matters more difficult, I do not have much experience with circuit design and do not really know where to start for this. 

I am comfortable enough with designing the VI for this project, it is more so the hardware side of things. I was wondering if anyone had any suggestions / pointers for what kind of circuit / how can I design the circuit for this project? Any help is appreciated!! 

TIA:)

[altenbach]

"SCC 68" is NOT a DAQ card, just a connector block with signal conditioning options. What DAQ device you you have connected to it?

[Paddle_to_the_sea21]

Apologies,

I am still trying to figure things out. Here is a screenshot of what is on the bottom of the cover, so the extend of using this is that AI and AO are the inputs and outputs on the card. Based on my limited understanding of the DAQ card, for this project specifically I should only need to us AI, AO and ground ports on the card.

[altenbach]

You still have not said what card you have that's connected to the SCC.

To control something, all you need is a digital or analog output, depending on what your needs are. For example to turn a lamp on or off, you could control an SSR. To change brightness, you could just vary the duty cycle

[Paddle_to_the_sea21]

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@altenbach wrote:

You still have not said what card you have that's connected to the SCC.

To control something, all you need is a digital or analog output, depending on what your needs are. For example to turn a lamp on or off, you could control an SSR. To change brightness, you could just vary the duty cycle

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Hello, 

I checked my NI max and is the NI PCI-6259 and I am not able to get a current output from the card. 

[altenbach]

You have a voltage source, not a current source. Connecting anything with low resistance will not work, of course. You can only draw a few mA, so check the specifications.