I want to continuously measure voltage, current and resistance of a wire

[David1982]

Hello,

I am new to the data acquisition. I have a wire that has resistance of aprox. 3 ohm. When I supply a voltage of about 1.5VDC , it carries a current of around 500 mA. I want to continously measure voltage , current and resistance across this wire. I am using PCI 6040E and BNC 2090. Any help is much appreciated.

Thanks.

[mickeyw]

Hi David,

In order to continuously acquire, you will need the code to be inside a while loop. The easiest way to acquire from a DAQ device is using the daq assistant express VI. You add the channels that you want to measure from into the DAQ assistant and then you can perform V=IR functions within the while loop using the numerical functions in LabVIEW. By having indicators on the front panel (inside the while loop) you can have the indicators of resistance/voltage/current constantly updating.

I hope this help.

[David1982]

Thanks for reply Mike,

Actually I know how to buid a VI for this, but what I wanted to know was about the physical connections from the wire to the BNC. I am using high currents so I wanted to know about different connections to do measurements.

Thanks again for your help.

[David1982]

I want to add one thing: The resistance of my test wire keeps changing when I am making measurements.

Thanks

[mickeyw]

Hi David,

My apologies for the delayed reply. I think this link will be of some assistance to you- it documents some wiring and noise considerations. There is also some useful information and manuals on this link.

Best Wishes,