Calibration with NI9237 and NI9944 strain gauge.

Similar Questions

• Negative results with strain gauges

  When I run my VI the results are always negative. I use the NI9237 with the NI9945. I wired my installation as one quarter bridge. There are three wires from the strain gauge. I went on the wires and I think it's okay / characteristics of NEITHER. Is there something in the MAX that I should be looking. Not sure why the values are negative.

  Thank you

  Harry Stone

  Hi Harry,.

  There are a few things I want to clarify:

  -Traction deformation is positive and compression deformation is negative, what is described a high level in the tutorial below.

  Strain with gauges
  http://zone.NI.com/DevZone/CDA/tut/p/ID/3642

  As strain compression is negative, you would see negative within MAX results if your strain gauge knows any compression. Please keep in mind that a shift can be associated with each transducer, that's why some sensors use a calibration certificate. It is produced by the manufacturer and is provided with the sensor as is the specific sensor. The sensor goes through a testing process to determine its actual response compared to the ideal. In this case, a scale of table can be created to include these values.

  How to do a custom able scale & Automation Explorer (MAX)?
  http://digital.NI.com/public.nsf/allkb/3F6558112FD2C776862575B5004F7F87?OpenDocument

  Not all manufacturers of sensors provide a calibration certificate. Or you can create your own table by placing known quantities of pressure, force, etc. on the sensor and map it to the corresponding voltage, or you can create a linear scale in MAX adjusting the intercept (b) the value necessary to remove any compensation.

  You use the NI 9237 that compensated supports deletion. A null offset is executed with the sensor fixed without load placed on the sensor. Actually, a measurement of voltage is taken and this value is subtracted off the coast of each subsequent measure therefore removing the start offset. This takes up space you creating a linear scale and in doing so manually.

  The two links below show how to use a custom scale created in MAX in LabVIEW, as well as coding the custom in LabVIEW scale to remove the dependency of MAX.

  Acquisition of DAQmx with custom scale
  http://decibel.NI.com/content/docs/doc-3706

  Create a linear scale customized for each channel AI in LabVIEW using DAQmx
  http://decibel.NI.com/content/docs/doc-11136

  I recommend using a task sequence. Input parameters for the information about your strain gauge needed to perform the conversions of strain. There is an example of a measure of deformation in the example Finder LabVIEW (* open LabVIEW * help > find examples) designed specifically for the NI9237 that incorporate deleting the offset and shunt calibration devices. If you do not have external wires connected for calibrating shunt such as cited in this document , you will receive an error. Here is an explanation from the NI-DAQmx help Shunt calibration (start > all programs > National Instruments > NOR-DAQ > NOR-DAQmx help) to help better explain this feature.

  Shunt calibration (adjustment of Gain)
  You can check the output of a measurement system based on a bridge by comparing the measured output bridge with a calculated value if the physical load on the sensor is known. NOR-DAQmx can then use the difference (if any) between calculated and measured values as a factor of adjustment of gain for each measure. You can simulate the application of a load at the bridge by connecting a significant resistance in parallel with the bridge. This resistance, known as a shunt resistance, compensates for the voltage from zero of the bridge. Because the value of the shunt resistance is known, you can calculate the physical load corresponding to the voltage drop of the resistance.

  Use the Shunt calibration perform the Assistant DAQ or DAQmx VI/function to perform a calibration shunt, which defines the the gain setting for a virtual channel. NOR-DAQmx then uses this adjustment of gain when you descale readings from the bridge. Some National Instruments products are internal resistance.

  This may seem like information overload, but I wanted to provide you with a detailed explanation of your understanding, in addition to immediate responses. As a logbook, I recommend that you use the 9237 strain example and use the removal compensation. Negative values are expected for compression and positive for blood. The handy Guide below gives an excellent overview of the strain gauges, which also includes a video.

  Measurements with strain strain gauges: practical Guide
  http://zone.NI.com/DevZone/CDA/tut/p/ID/7130

  Hope this helps!

• Strain gauge: calibrate, relaxation and to write to the file

  Hello

  I'm new to labVIEW please bare with me.  My title says I'm trying to do.  I want to capture data from strain gauge using a trigger and write data to a file.  However, I also want to be able to calibrate the strain gauges.

  My attached program reads the data correctly with relaxation and stores it in a file, but it does not calibrate properly.  If I run the program several times and press the button "calibrate" each time, finally get gauges calibrated after two or three iterations.

  Is it possible to change the program so that the gauges are calibrated and then data can be triggered and written to the file?

  I'm using LabVIEW 8.6 and NI-DAQmx 8.8.

  A screenshot of the front panel is also attached.

  So I thought about it, but I'm not completely sure why it works.  I didn't remove the loop condition around the calibration block and the program works beautifully.  All I have to do is wait about 20 seconds before I hit the trigger for the calibration to be completed, and my gauges will be calibrated when I pull the trigger.

  This program works very well for this application.  However, it is difficult to change because all parameters are constant in the block diagram.

• With the help of the strain gauge convert read vi

  I'm having trouble with the wiring of the strain gauge convert reading vi. Are there examples of this vi showing how to connect?

  Thank you

  HS

  Have you checked the help file to this topic?

  http://zone.NI.com/reference/en-XX/help/371361G-01/lvinstio/conv_strain_read/

  There seems to be some examples of stock to use, but the help files for these screws can be VERY useful.

• To win a set of multiple strain gauges

  Hello

  We are using several gauges of constraint and "Calibration of Shunt DAQmx Perform (strain) .vi" for calibration of shunt. We want to output, gain adjustment, used by the "Shunt DAQmx Perform (strain) .vi calibration" for each caliber. We've had some success using a property node (see attached pictures 1 and 2); However, when we try to use the same method to achieve adjustment gain, any other strain gauges (picture 3), the readings are always 0 (visible) in image 2.

  If someone could give some insight on how to get the gain adjust for several gauges, it would be highly appreciated.

  See you soon

  Bart Scicchitano

  (using his account of supervisors with his permission)

  Hi Bart,.

  You can be is 0 because there are several channels in the same task, then the property node does not know the following. You can set the active channel by using the Active Channel property node. Place a DAQmx channel property node and select ActiveChan from the drop-down list. Give it a try and see if you can read the multiple factors of gain.

• Measure the voltage of strain gauge

  I have connected my 9237 to a 9945. I use a 350 ohm strain gauge. I have the voltage set to 2, 5V Max is there a way to measure physically to be sure that it is 2.5V? Also, in my vi I use a DAQmx create function of the channel. I want to add another channel for this but can't see how to do it.

  Thank you

  HS

  Hi, Harry, it's Paul with engineering Applications to the OR.

  My first question is why you are wanting to physically measure the voltage?

  If you are wondering how that tension may vary, it is limited by the maximum capacity of 150mW of your device, as explained here: http://digital.ni.com/public.nsf/allkb/7CBC67482CC9FB318625758C0048FF73?OpenDocument

  If you want to continue to measure externally, you have a few options.  You can use another DAQ hardware to measure the voltage, or you can use another external device, like a digital multimeter.

  If you want to see in the excitement that is actually supplied LabVIEW code, you can use the node property DAQmx 'Value of real excitement'.

  As far as playback of multiple channels, theres two ways you can go about it.  If your channels are sequential and all have the same settings, then you can change your name of the physical channel to something like 'Dev1/ai0' to ' Dev1 / ai0:3: to specify the first 4 channels.»  Alternatively, if you wanted to select non sequential channels, you can chain create channel set tasks, as long as they are of the same type of task (AI voltage, etc.) and the same device, as shown below.

  

  Let us know if you have any other questions.

  Kind regards

  Paul

• Reading of several strain gauges (10 to 20 strain gauges)

  I work on my ME senior project and I try to read the pressure on the suspension triangles and the stems of thrust for vehicle FSAE of our school. I want to read and data log 5 readings of strain by corner so 20 strain readings altogether. The system must be compact enough to fit in the car.

  From my research, each strain gauge will have 4 analog inputs (2 analog channels, one for the constraint of voltage reading and one for the voltage of reading). It would mean I would need 80 analog inputs to achieve this and I can't find a proper data acquisition.

  I'll try to find a good solution cheap and easy to achieve and seeks in things like multiplexers to change string beetween to demand less entered DAQ, but it becomes very compliated.

  Can anyone recommend a good cheap and easy solution to accomplish this task?

  Reference example of strain canal bridge: (http://zone.ni.com/devzone/cda/epd/p/id/6417)

  Thanks in adance for any input!

  You must first complete circuits bridges.  If you plan to use a unique to each place active extensometer, then you connect the other 3 elements (resistors or dummy gauges) complete form bridges.

  If you had a handful of bridge circuits, the U3 would be the least expensive option.  With a U3 - LV, you need 1 LJTick-InAmp for each circuit of 2 bridges, which would be about $170 to manage 2 bridges.

  For circuits of 20 bridges, however, the cheapest option will be a U6/U6-Pro with the Mux80.  For a little more, you can go with the T7/T7-Pro for Ethernet and WiFi in addition to USB connectivity.  These solutions will be about $450 - $650 and give you 84 analog inputs (you need 40 analog inputs for your 20 differential signals, most at least 1 analog input to read the voltage).

  What is the rate of scanning max you need?

  There are some more details that we can get in, so you can send us an email to talk more.

• As a strain gauge measure weight?

  Hello everyone. I am doing a project in Labview and I have to measure the weight of the different animals. I was thinking a strain gauge to measure with the NOR-9237 as DAQ hardware. Can it happen? I downloaded a system image.

  Thanks in advance

  You're still more general. If you want us ethe USB daq, you should have the driver for the acquisition of data so that you can detect the hardware in the window of measurement and Automation Explorer and then take an example of simple data acquisition and trying to work around. Create a task for the channel you are going to connect to the strain/in² and then configure the channel type and etc, and then you're good to go with the stuffs of base (DAQ assistant) in LabVIEW.

• Compensation of temperature for the strain gauges

  I'm trying to compensate for the effects of temperature on an extensometer placed on a sample of carbon fiber.  The sample will be only responsible uniaxialement.  The temperature is a major concern here, for an electrical current will be executed by him for purposes of measurement, which should also heat the sample.  I read in the document 'Strain gauges measure' on the website of NOR (http://www.ni.com/white-paper/3642/en), but he speaks with a Measurer of mannequin, he speaks not just how this second pledge, placed perpendicularly to the axis of the applied force, we are not talking of how connect to the strain gauge module , in my case the NI 9235, to use for temperature compensation.  My first thought was just connect each pledge to the module as their own separate channels, using quarter-bridge in the LabVIEW software set up, calibrate the two gauges while not external physical load or temperature effects are applied, and then, after the test, by subtracting the measure pledge Sham in the values of assets pledged.  But then I started wondering, is there a better way to do this?  Can I use the half-bridge configuration, or some other configuration with the 9235 to automatically merge the readings two pledge during the test?

  I'd appreciate it really any advice that anyone can give me on this.  I don't want to build my own external wheatstone bridge (other than the built-in NI 9235), and I would like to make these measurements as accurate as possible.  I have also considered the possibility of the compensators measurers, but I don't think this would be applicable in this case, the complexity of the matter - being a composite.

  Hello WyoEng,

  You want to use the temperature compensation is referred to as a quarter bridge II configuration (image below). This configuration is very similar to a half of the bridge, while the second element (R3) is inactive because it is placed transversely to the direction of the load, without strain and in the same location the active gage (R4) to take account of thermal affect.

  

  NI 9235 supports only a quarter bridge I configuration for measures of constraints.  You will get an error if you try to use this module for any other configuration of pledge of strain that is not quarter bridge I. Thus, active policy that you asked to use two channels to read the pledge and the dummy gage will be the best option to use NI 9235 to compensate for thermal effects on your extensometer.

  Another option would be to look on the NI 9237 which supports a quarter bridge II configuration.

  Best regards

  Izzy O.

  Technical sales engineer

  National Instruments

  NI.com/support

• How do I program labview to read a full bridge strain gauge placed at an angle of 45 degrees to measure the torsional deformation?

  Hello

  Currently, I'm trying to convert the reading of the strain gauge allows to get readings of the strain of a game of strain gauges of configuration of full-bridge at an angle of 45 degrees on a hollow cyllinder. It is set at 45 degrees, because we are trying to get traction and compression strains resulting from the application of the twist, or a moment of torsion, to the cyllinder hollow. Finally, we want to convert these readings of strain in order to get the couple. Our problem is that full-bridge options to convert the strain gauges appear only apply to configurations 0 or 90 degrees. My question is how can I take my current VI and set it to take readings of the strain of an alignment of 45 degrees. Also suggestions on how to add couple of this VI measures would be appreciated. We have scoured the site, but we are very new to Labview.

  Thank you!

  

  This is not a very good example, they show.  Full-bridge 1 will also read the constraint of torsion.  Full-bridge 1 is for any configuration where you get 2 gauges of tensile and compression 2 meters and you expect roughly equal magnitudes.  With a twisting bridge, the only thing you need to do is to make sure that the wiring and pay attention to the numbering of gage.  Think just mentally on what measurers are in tension and in compression as you twist the stem or tube.

  If you're wrong, you pretty much know immediately because you will see very little change in the output when you go to the torsion of the shaft because the templates of traction and compression will liquidate cancel each other in the bridge rather than expand their effects.  To fix it, all you will need to exchange a few threads to effectively rewire the bridge correctly.

  Good luck in your project.

• How the other drive app option to calculate calories? I did 45 minutes yoga with him and he showed the 260 callus which is high of 45 mins of yoga session.

  How the other drive app option to calculate calories? I did 45 minutes yoga with him and he showed the 260 callus which is high of 45 mins of yoga session.

  ISuspect that is not correct.

  Hello

  Saving workouts through the app to drive using others as the type of activity, active calories are estimated at a rate equivalent to a brisk walk or based on the data recorded by the heart rate sensor, according to what is higher.

  The following steps can help to improve the accuracy of the estimates made by your watch:

  • Estimates for calories and other results depend, in part, your personal information. To verify that it is accurate:
    • On your iPhone, in the application of the watch, go to: My Watch (tab) > health > Edit (top-right).
  • While training, to optimize the performance of the heart rate sensor (data from which is used when estimating calories), make sure you wear your watch fits on top of your wrist. Apple suggests that consider you the clamping Strip before starting a workout and it loosen again thereafter.
    • Note that the heart rate sensor is likely to give better results for the workouts that involve rhythmic (such as running) rather than the irregular movements.
  • Calibrate your watch can improve the accuracy of various estimates related to the activity, including estimates of calorie. To calibrate your watch, follow the instructions in the link below support article. You can reset your calibration data and start the process:
    • On your iPhone, in the application of the watch, go to: Watch My > privacy > Motion & Fitness > tap reset Calibration data.

  More information:

  Use of the workout on your Apple Watch - Apple Support

  Your heart rate. What it means, and where on Apple Watch you will find. -Apple Support

  Calibrate your Apple Watch for better accuracy of training and activity - Apple Support

• Which is good for the unit, weighing between NI9237 and NI9219?

  Hello

  My name is Jeonghwan Lee and I am a new setting of load cell measurement system.

  In my lab, we must implement the load cell measurement system of multiple scale and equipment using OR.

  And in the future, we want to measure the torque sensor or pressure sensor.

  I consider just between the two models (NI9237 and NI9219).

  These two models can measure sonsor as load cell signal, but I don't know what is best for me.

  We want a module that is easy to configure and has more precision.

  Load cell that we use is LCMFD series of Omega.

  I know my question is ridiculous. However, I'm not a professional man in this area, so I need your help.

  I have attached a spec of load cell.

  Thank you

  If you don't need the dynamic range (100 Hz to 50 kHz samplerate sampling rate) I would tend to the 9219, however, a point is the voltage:

  Some sensors (piezoresistif) bridge must (must) be supplied with voltage defined (usually from 5V or 10V) levels and the 9219 a other supply voltages!  Check with your provider of sensor!

  That would be a point to the 9237.

  Ask your Rep OR local if you can test both.

  Migth be that only one card is better on noise figure in your application. (If you compare: higher sample rate usually means more noise, but a medium filter allow you to compare)

  The specification of pure sound is not the whole story.

  Accuracy of the two cards is better than the specifications of your sensor.

• Problems with QE65000 and optical driver Océna spectrometer

  Hi, a few months ago, I installed the driver to use the spectrometers of USB4000, HR4000 and QE65000 with LabVIEW 2010 with Windows 7 - x 64. Recently, I measured the spectrum of the Source of Calibration HG - 1 Mercury Argon with the help of software SpectraSuite and a LabVIEW program QE65000 spectrometer ("optical ocean 2000 4000 acquire continuous Waveform.vi, example of library, Fig1"). When I got the two spectra, I observed that there is a shift to the infrared region of the spectrum with LabVIEW program. Acquired calibration coefficients are consistent with "wavelength calibration data" that comes with the spectrometer (Fig2). So, I would like to know if there are problems with the example of the library program or what is the problem?. Attached to this message I send image of obtained spectra.

  The black figure is the spectrum obtained with the example LabVIEW program, including the ocean optical library. The red graph is the spectrum obtained with SpectraSuite and coinciding with the real spectrum of the HG-1 lamp.

  Best regards, Diego

  Version 1.3.2 should be alive in a few hours and this latest version is implementing the changes suggested above.  Did someone mind try these out and let us know how it goes?

  2000 4000 optical ocean pilot Page

  http://sine.NI.com/apps/UTF8/niid_web_display.download_page?p_id_guid=7833BD4A31DA1274E04400144FB7D2...

• Several strain gauges

  Hello

  I'm trying to run a simple application, where several strain gauges is to read, nothing fency. I use an indicator of the gauge to display the strain reading well. The problem is when I connect multiple calibers, I do not know how to assign the individual indicators to different strain gauges, so all my indicators in gauge end by showing the same value. What I want is the different gauge indicator show the succession of different strain gauges.

  Material: Labview 8.5.1, block SC-2345, CSC-SG01 measuring module connector, card data PCI-6251 acquisition.

  Thank you

  Sine

  On the block diagram, go to Express---> Signal handling.

  You will see some functions to merge and split signals.  It is mobile control.  You can enter the bottom and drag them down, so you can create multiple entries (Merger) or outputs (for split) as needed.

  Eventually you want to get a way to use the Express VI, but they are good for a beginner to get started quickly.

  To learn more about LabVIEW, I recommend watching the LabVIEW tutorials online
  LabVIEW Introduction course - 3 hours
  LabVIEW Introduction course - 6 hours

• UP2716D, calibration with Spyder5Elite?

  I was just request if it's a good idea, or necessary, calibrated my desktop PC, with my Spyder5Elite software, when it is connected to my Ultra strong UP2716D monitor.

  I ask this question because this monitor is calibrated at the factory to equipment.  TI have set the monitor to the Adobe RGB color space

  I would just in the calibration with the Spyder5Elite of thinking would only make changes to my graphics (GeForce GTX 970 4 GB graphics card) card and not on the screen.

  Sorry if this is a silly question, but it's my first monitor with hardware calibration.

  Our software changes the LUT (Look Up table) in the monitor CAL1 and CAL2. Read the User Guide on page 40.