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The equation is Vr=(Vsg-vinit)/Vex per the context help for Convert Strain Gauge Reading VI. For the strain measurement Vr is used to calculate strain using the equation in the attached picture. As you can see, if Vsg is positive then Vr will be positive and strain will be negative for compression. Similarly strain will be positive for tension.
I am indeed using an NI-9237. You are right, I should get a negative output at compression according to the Wheatstone theory, but its positive in my case 😕. The gauge specs (attachment 1) and wire connection (attachment 2 and 4) info that you requested are attached. I am reading strain on the y axis ( attachment 3).
I have set the sampling frequency to 10000Hz, so the device could catch event to 0.1 ms. The type of the strain gauge is Showa N11-FA-5-350-23 with resistance 350 Ohm, gage length 5 mm. Maximum strain peak was about 1.5e-3, so material was in elastic zone and I don't think it has exceeded the limits of the gauge.
The program with default settings is reading negative strain values, when the values are expected to be positive. The strain guage installation was checked, the wiring was checked, and the jumper cables connecting to the NI 9237 were all checked, and according to the manual and the description on the module itself, all of our connections are ...
A higher voltage makes the output less sensitive to noise. A sampling rate of 10k is pretty high for load cell strain gage measurements, you might also have a resonance issue. You can try different sampling rate. If your application allows it try keeping your sampling frequency below 1 Khz. Ben64.
Hi guys! I'm new here and I hope someone may be able to offer me some advice. I have 2 strain gauge attached on a closed steel tube (one at the bottom of the tube and one on the side face of the tube). All sides of the tube are tightly closed. Inside this tube, there is some kind of dynamite and I h...
You can pick whichever function best matches your application. Using a CAN database, you can write engineering values (such as floating point numbers) to a function, and tell the CAN driver to send the latest value periodically. If you want lower-level control, your code can build up the CAN packets and send them explicitly.
Right now the strain gauges are hooked up to a SC-2043-SG signal conditioning board, which in turn is hooked up to a PCI 6251. The problem right now is that while the computer recognizes the device and is getting output from it, I'm getting a constant negative voltage (-10.2 V or something like that).
This way, you can maintain the shunt calibration from your initial strain gage readings, and not experience this offset which makes your later readings invald. 2. Try doing neither the offset null or calibration and seeing if the readings are within expected range the second time you run this VI. 0 Kudos.
Hi all, I need to find the number is positive or negative in an array elements. If it is negative i need ...