Multifunction DAQ

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Please ADVICE.

Hello.
I have DAQCard-1200 and LabVIEW 5.0.1f.
I should measure resistance in range 100 - 1000 kilohms.
Can I do it? Please advice me. Can I use +5V from pin 49 in my DAQCard for
this task?

Is circuit (see attachment) will be work?
Ohm's law.

Thank you.
Vadim Gnatkovsky.



[Attachment circuit.bmp, see below]


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Vadim

That circuit will not work as you have drawn it. It will work if you rearrange the circuit like the attached 'circuit.bmp' and use
these equations.

I[R] = I[1k] = (5V-U2)/1k

R = I[R] x U2

Also note that you cannot always guarantee the supply voltage to be exactly 5V or even stay the same under load conditions. It may
pay to set aside a channel to measure the 5V supply. Of course this really depends on the accuracy and repeatablility of the
measurement.

Tim Streeter


Vadim Gnatkovsky wrote:

> Hello.
> I have DAQCard-1200 and LabVIEW 5.0.1f.
> I should measure resistance in range 100 - 1000 kilohms.
> Can I do it? Please advice me. Can I use +5V from pin 49 in my DAQCard for
> this task?
>
> Is circuit (see attachment) will be work?
> Ohm's l
aw.
>
> Thank you.
> Vadim Gnatkovsky.
>
> Name: circuit.bmp
> circuit.bmp Type: Bitmap Image (image/bmp)
> Encoding: x-uuencode
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