Fluctuation in torque measurement using NI 9237

[cbutcher]

Sorry to ask a question that is hopefully pointless, but how did you calculate the weight -> torque values? Are you sure you used the appropriate arm length when applying the weights during calibration, and carried out the correct conversions between e.g. kg mass and Nm torque?

[GerdW]

Hi Patel,

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@patelbrijesh535 wrote:

I am sorry about manufacturer manual, this is very old torque meter and we don't have manual available for specific model.

I am using 10V internal excitation from NI 9237 module.

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Did you connect the NI9237 and that sensor correctly?

Did you verify the 10V excitation voltage?

Can you cross-check with a "known working" (and probably not so old) sensor to verify the correct cabling and behaviour of the NI9237?

What else did you do to verify your measurement setup?

Can you even supply the complete sensor type/name?

[patelbrijesh535]

I have identified the wires as per its old connection. when it was installed with old data acquisition system. my model is TP - 5KMCB from KYOWA, I contacted them and they have provided attached manual, which doesn't cover my model.

[patelbrijesh535]

I was mind full of weight. I did use arm length 0.5m and applied weights from 0.5 kg to 9 kg.

[GerdW]

Hi patel,

then why don't you follow that manual?

It recommends excitation voltage in the range of 1…4V!

[patelbrijesh535]

This manual doesn't have model which I am using, so I decided to go as per pervious connection where 10V was used.

[RavensFan]

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@patelbrijesh535 wrote:

I was mind full of weight. I did use arm length 0.5m and applied weights from 0.5 kg to 9 kg.

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When you did the calibration, what output did you get with 0.5 kg and what at 9 kg?

You said this is an old torquemeter.  It is based on slip rings.  Are you sure it isn't damaged and getting the electrical signals across the slip rings?

Have you tried using an ohmmeter across the the various bridge leads to see what resistances it is giving you?