convert voltage to force

[B-rad-is-dad]

I'm having an issue due to the fact that my NI MyDAQ can not use the force option  in analog, acquire signals. I know that there is a way to change the voltage to force but I do not know how to do this on LabVIEW. Please help!

[Dylanh]

If I am understanding correctly, you have a force gauge that you need to read from using LabVIEW on an analog input channel? What you'll need to do is take a look at your gauge's data sheet and determine what kind of output(s) it is capable of. Usually, they will output a 4-20mA or 0-10v signal. The data sheet will also tell you the relationship between that output and the amount of force input into the gauge. (Usually directly proportional to the range the gauge is capable of reading. I.E., if the output is 0-10v and the gauge can read 0-100ft-lbs, then you can calculate that 1v = 10ft-lbs.) 

Once you have that information use the DAQmx or DAQ assistant VIs to read the input, and use the software to convert the voltage/current to force and record/display it as you will. 

Hope that helps. 

[JÞB]

Its called a Scale.  Apply a scale the the AI channel

[rifel]

I have the same problem. I used dynamometer to measure cutting force in grinding process and kistler charge amplifier then connected to Labview program. Labview shows signals and value in mV unit. I have no idea how to convert them into force unit, I am newbie about labview.

Thanks

[RavensFan]

The specifications of your sensor should give you a voltage to force conversion factor.  What do they say?

[PalanivelThiruvenkadam]

Nothing to do with LabVIEW, Just a conversion factor to convert acquired mV to force (Basic Math calculation will do for you)

You just need to understand the conversion / scaling mechanism.

[rifel]

There is no information about voltage to force convertion. I used Kistler dynamometer to capture grinding force then connected to Labview program. I attched the tecnhnical data of dynamometer as sensor.

[RavensFan]

Rifel, are you the same person as Brad is dad?  If so, why did you create a different user account?

If not, then this thread has gotten confusing as to who you are and how you are related to the original poster.

That image looks more like a load cell than a dynamometer.  Are there any other pieces of equipment to connect to it like a charge amplifier?  I ask because those specs talk about  a pC/N output sensitivity which is picoCoulombs.  That makes the question as to how picocoulombs are getting converted to volts?

How is this device connected to your computer?

[BertMcMahan]

Yeah that's not a dynomometer, that's a load cell. And Kistler uses charge amplifiers to convert pC to Volts. You need to see what your charge amp is set to.

[rifel]

 RavensFan, I am not B-rad-is-dad. It's just coincidence have same problem. I used Kistler dynamometer type9257B and connected to Kistler charge amplifier type 5019B. From charge amplifier connect to A/D converter then go to computer with LABVIEW program installed. On the charge amplifier, the setup are:

1. TS (Transducer Sensitivity/sensor sensitivity) 9.99E+1 in pC per mechanical unit (pC/M.U)

2. SC (scale) 1.00E+1

3. lowpass filter off

4. Time Constant = long

In the Express task of Labview window shows the signal and the force value in mV directly. How to convert the voltage value that shown on labview DAQ to force unit?

Below I attched the capturing.

Thank you very much for your response and reply.

Best regards