Connection for load cell to NI9237

Hi,
I have this omega load cell part LCKD-10 which is a half bridge load cell that I need to connect to the NI9237. Please advice on the connection.
Thanks
Joelle

Thanks. I need to write out a program which checks the centrality of force. I will be using 5nos of the omega load cell, 1 in the centre(Isolated) and the other 4 at all 4 corners. I'm suppose to firstly calibrate the load cell and then take measurement of the force applied to the 5 load cell and display the result in a form of a radar graph (Just a dot in the centre of the graph to show the centrality of the force). Appreciate if you can provide some procedures or program that I can use or try out.

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It is probably possible, but you have to have some additional circuitry in order to use the load cell. Typically, load cells are comprised of strain gauges which require some kind of Wheatstone bridge completion. Additionally, most strain gauges need excitation. If you can provide the bridge completion and excitation, then you could simply read the output of the strain gauge by connecting the output + and - to your SCB-100. However, setting up this external circuitry can be a little complicated. So, the recommended setup is to use some signal conditioning. National Instruments provides a couple of options regarding signal conditioning for load cells. Below is a link to a tutorial that discusses how to measure a load cell and what hardware is recommended for
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Attachments:
custom_scale.png ‏53 KB

Hi John,
Thank you for a good description of the problem you are facing, as I understand it you have set up a custom scale but it doesn't seem to be functioning as you expected.
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Dear 917996,
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I can't see anything special with your settings, so I currently don't have a clear understanding, why the output voltage is limited.
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Hi,
At this point, it is difficult to determine exactly what is happening to your acquisition. Could you please provide some additional information by answering the following questions:
What voltage are you reading with the 500 lb load cell?
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What is specifically happening when you connect the 100 lb load cell?
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Advantages of NI-DAQmx:
Transition from Traditional NI-DAQ to NI-DAQmx:
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Hi, I'm trying to set up some Data acquisition from a load cell through my FeildPoint AI-110. The Load Cell I have is rated to 500KG and has a Out put of 2.997 mV/V. I can connect the load cell to field point and display the voltage difference in Max, but I’m struggling to use this to get any kind of scaled reading to using in Labview.
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I think the attached should get you pretty close. The top section uses just the constants you posted and
assumes a constant excitation voltage of 12.25. The bottom section uses the actual, current excitation
voltage when the measurement is made. I think this second approach will probably give you better long
term results.
The bridge voltage is the voltage displayed in MAX.
Matt
Message Edited by Matthew Williams on 07-04-2007 08:48 AM
Attachments:
strain_example.vi ‏34 KB

Question on Measuring Lift Force for MAV Ornithopter for Student Project using Load Cell

Hey everyone!
I am new to these forums so bare with me, please. I am part of a senior design student group working on making a micro aerial vehicle ornithopter (generates lift by flapping its wings) similar to this Design.
We are using this load cell connected to an AD620 Op-Amp circuit that basically has two input wires from the load cell coming into the op-amp with a gain of 100 (there is an Rg resistor with 500 ohms in the circuit). The load cell and op-amp circuit are both powered correctly with 10 V and +-15 V, respectively. There are two output wires coming out of the circuit. One comes out of the 6th terminal of the op-amp, and one is connected to ground. If we turn on everything and test the output of the circuit with a multimeter there is little if no fluctuation in the output voltage, which is about .25 V with zero load. If we add precise weights and form a linear graph of the output voltage vs. weight, we can find that there is about .0045 volts/gram relationship.
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Here is a picture of the front panel that shows the output we are getting http://img130.imageshack.us/i/frontpanelg.jpg/
Basically, I would have though we could get a straight line that continuely increases or decreases depending on the load on the load cell. Why would it graph a ton of vertical lines? I would think it would be just one data point per time value?
Here is the simpler block diagram just to test the output: http://img26.imageshack.us/i/blockdiagramsmall.jpg/
Here is the main block diagram that we were going to use to convert to force, etc. but its not working (no need for while loop?): http://img15.imageshack.us/i/blockdiagrambig.jpg/
The properties of the DAQ Assistant VI is as follows:
input range: -10 to 10 v
RSE terminal configuration
acquisition mode: n samples and not sure how many samples we want to read or how fast. we had 1k hz and 100 samples and the image above is basically what we got it the program runs continuously.
I don't know what else I can tell you, except that if anyone helps me you would be like a godsend to our group. It would be very much appreciated
Thanks!!!

As I am unable to look at youor images (the corporate filter here is blocking the url) I can't see what you are describing. I will say that a multimeter will not show fast transitions that will show up in a LabVIEW/DAQ application, so using a meter usually doesn't tell you that much about signal "cleanness". How long are the wires from the op amp/load cell to the DAQ? How long are the wires, and what type (shielded, twisted pairs, untwisted pairs, etc.) from the load cell to the op amp. The output levels of the load cell are usually quite low, so the possibility of also picking up "environmental" electrical noise is very high, and this will be amplified as well. Since the output of the op amp is higher, the noise introduced between it and the input to the DAQ is less of an issue, but there as well. So making sure that signal wires are properly shielded and grounded is important, and there are long papers describing this for low level analog signals. Since the load cells desired output will probably vary relatively slowly (a few Hz) it may also be helpful to put a simple low pass filter before the DAQ.
You should insert the images into your post, as jpg, or png (you have jpg images) Not bmp! (this is for others that might read your post, yours are jpg which should be ok). Generally most of us won't or can't go to links, corporate network filters and corporate policies frown on it, too much maleware lurking at the end of unknown URL's
Putnam
Certified LabVIEW Developer
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Currently using LV 6.1-LabVIEW 2012, RT8.5
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Is it possible to condition a load cell signal with a 1520 SCXI and then use it as the primary analog feedback for a 735X motion control board?

My system
PXI 1052 chassis
PXI 8196 RT controller
Flexmotion 7356 motion controller
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1520 SCXI
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1314 SCXI frount mounting terminal block
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Is it possible to condition a load cell signal with a 1520 SCXI and then use it as the primary analog feedback for a 735X motion control board?
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Patrick Aubin
Ph.D Candidate
University of Washington &
VA MedicalCenter of Excellence for
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Hi GG,
Thank you for your feedback.
>create your own external circuitry to amplify the signal.>
True a few op-amps could amplify and filter the signal externally but the performance of such an amateur built system will never match the accuracy and functionality of the 1520 SCXI. That’s why we spent the $2500 for the professional version.
>One thing that you could do is to use a UMI with your motion controller and then wire your signal from your SCXI to the UMI.>
As I understand it the UMI is basically a break out connectivity interface for third party drives. After conditioning and amplifying the analog force signal with the SCXI module the analog signal isn’t available to wire into a UMI. To my knowledge the conditioned signal of the SCXI resides only in the PXI backplane (i.e. there is no physical access to the conditioned analog signal). Can you explain how the UMI could be help here.
Again thanks for your input GG.
Patrick

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I use my cell as my home phone and the GE Gateway worked fine with my old LG flip phone.   I have been unable to get the IPhone 4 to connect.
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Does National Instruments produce a DAQ equivalent of an electronic load for fuel cell testing?

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TravisW wrote:
I am trying to consider my options before purchasing an electronic load....
Any input would be much appreciated. Also if you have developed a testing system for fuel cells or other low power DC sources, please share any knowledge and information about how you went about designing your system.
Thanks
We used a DC Programmable Electronic Load from AMREL.
WE used GPIB to talk to each of them The loads ley us set constant current/voltage and let us query the current values etc.
Worked fine for us,
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Connection for load cell to NI9237

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