strain of understanding using NI9236

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  Hi Nathan,

  Thanks for posting your query in the Microsoft Community Forums.

  Need you same name of working group on different computers to connect over the network to the working group.

  I suggest you try to change the name of workgroup instead of the domain name. See the article for more information on the same:

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  http://Windows.Microsoft.com/en-in/Windows7/join-or-create-a-workgroup

  You can also read the following article to know the difference between a domain, a workgroup, and a homegroup:

   

  What is the difference between a domain, a workgroup, and a homegroup?

  http://Windows.Microsoft.com/en-in/Windows7/what-is-the-difference-between-a-domain-a-workgroup-and-a-HomeGroup

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• 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!

• Calibration with NI9237 and NI9944 strain gauge.

  Gentlemen.

  I have a cDAQ9172 OR with NI9237 and the bridge 1/4 NI 9944. Practically, I'm working on measures of strain gauge issues using a strain than 120 ohms connected to the NI9944 to build the bridge half happening inside of 9237. I have a continuous doubt how is the calibration for the strain gauges. The manual speaks of a shunt resistance which, in the case of NI9944, is already in the system. The manual says that I don't have the shunt resistance external nee. It is clear.

  My question is this:

  the menu for calibration requires a resistance value that I don't know, I'm leaving in the value proposed by the menu of NOR. The strain gauges takes easily compensate, so I always have to recalibrate the channels in the NI9237. Is this normal? Can a (application to 2.0 V strain gage) voltage of 2.5 [V] generates a continuous drift of the measure?

  Strain gauges are: EA-06-125BT-120

  Hi cgenco,

  Because the NOR-9237 with 9944 uses an internal resistance for shunt calibration, you need not to worry about the value of the shunt resistance. Take a look at the following article that specifies how connections are made. Calibration article will show you the basics behind how to exploit.

  Also, since there is a ratiometric measurement, the voltage is 2.5V shouldn't matter as long as your pawn takes care of everything.

• Cannot find device 9163 using DAXmx 9.1.7

  I'll put up the NI 9237 (for strain gauges) module using series C Ethernet ENET-9163 carrier.

  I installed DAQmx 9.1.7 which must contain the correction of the impossibility of finding the device when other USB devices are installed. (I have an HP desktop with the mouse USB, keyboard, etc., always under Windows XP SP3)

  When I run the Explorer measurement and automation (Version 4.7.0f4) and ask network devices to find NOR-DAQmx, nothing appears.  The troubleshooting steps in the Getting Started Guide OR-DAQmx for NI WLS/ENET-9163 aren't useful. (I do not have a static IP address for the 9163, that's what I want to put in place; I do not have a DHCP server)

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  What should I try next?

  I did a factory reset, so it wasn't the issue.

  I finally got to DAXmx 9.2.3 which has much better help text to put in place.

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• Configuration NI9219 for measurement of deformation

  Hello!

  I am putting in place a strain measurement VI using Labview. I use the NI 9219 module on the chassis NOR cDAQ 9172.  My extensometer is configured in a quarter-bridge arrangement and I did strain gage connection accordingly (to the terminals 3 & 5 in NI 9219). However, I do not understand what are the terminals of TEDS and what to connect to these terminals. Can I use virtual TEDS for this? I couldn't find a virtual TEDS for NI 9219. Any information to resolve this issue would be much appreciated.

  Best,

  Nyquist99

  Hi, the terminals of TEDS are only for transducers, as a strain gauge, that support the TEDS (Transducer Electronic Data Sheet).  The standard of TEDS is just the ability to a transducer to record information about itself in the internal memory.  This information includes things like dates and calibration constants, one of the factors, electrical characteristics, etc.  It is stored in a standard model which can be read by computers and the DAQ cards via these lines TEDS.  For your application, you must just let unwired and to the top of your strain of installation normally gauge.

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  After the search and read a few posts from forums, I understand using the sequence is probably not the best idea?

  I wanted to get some advice on the best way to address my problem.

  What I want to do:

  I intend to use the van der Pauw method and the hall effect to experimentally determine various parameters for a small sample of semiconductors.

  Right now, it's a lot of your time to make all of the BNC connections required by the hand that in all the totals to 24 or 48 connections to make.

  To speed up the process, I want to use Labview to control a microcontroller to control transistors which controls of the Tower relays who make the required connections. At the same time after each series of necessary connections have been made, a current source controlled by Labview must provide the necessary current, a voltmeter to read voltage. A total of six different sets of four connections to perform and voltage read for all six groups. This must be done twice, but since the equipment creating the magnetic field is controlled manually, I can just run the program twice.

  Recently, I learned how to control an arduino using labview and how to control the power source and the voltmeter using labview as well.

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  Digital I/o using 6-pin on arduino

  1. initially, all pins are attached below.

  2. first pin set high, while the rest remains low. This option turns on a transistor making it the first series of connections.

  3. the current source is turned on and provides a specified amount of current to the sample.

  4 voltmeter measures the induced voltage and stores this as a double or be it in something like a table.

  5 current source turns off.

  6. second pin on arduino set high, while the rest low and steps 3 through 5 are repeated until all 6 pressure measurements were recorded.

  7. the 6 measures must be exported to excel the file or Notepad or other.

  8. the same data could be transmitted to something like a different tab in the same program to perform the calculations to find the semiconductor, parameters of the sample.

  So now my question on the best way to do these things. I was looking through labview and found what is called a sequence of flat, but according to the forums it's supposed to be frowned upon.

  My other thoughts using some kind of combination of loops/case, but I'm not sure how to structure and what should be included or excluded from the loop. Other thoughts are maybe a timed structure. Another possibility is to create 6 different vi and calling it one by one.

  So basically the program run, and once completed, I need for each measure 6 voltage, preferably displayed in both a table and saved in excel/Notepad.

  SaintsFan says:

  So here's the sequence that labview should send orders:

  Digital I/o using 6-pin on arduino

  1. initially, all pins are attached below.

  2. first pin set high, while the rest remains low. This option turns on a transistor making it the first series of connections.

  3. the current source is turned on and provides a specified amount of current to the sample.

  4 voltmeter measures the induced voltage and stores this as a double or be it in something like a table.

  5 current source turns off.

  6. second pin on arduino set high, while the rest low and steps 3 through 5 are repeated until all 6 pressure measurements were recorded.

  7. the 6 measures must be exported to excel the file or Notepad or other.

  8. the same data could be transmitted to something like a different tab in the same program to perform the calculations to find the semiconductor, parameters of the sample.

  A state machine with these 8 States (and perhaps some assistance States: idle, stop, start, error, etc..).

  Basically a while loop with a case structure (one case for each State) and a State (e.g., enum) variable in a passage that. Look at the design templates provided with LabVIEW.

  (A flat sequence is too rigid for this. What happens if an error occurs in the #5 State? It has no way to go to a State of emergency. What happens if you want to stop in the Middle? What If a State fails and must be repeated.)

• Passing an array of wave shape of the main Vi to Subvi

  I'm taking a waveform chart and have it draw accurate information and even a chart in waveform in a Subvi. For now, the waveform is getting the information of a Global DAQmx channel and information is posted on the waveform table.

  I would like to pass this information to a Subvi as well as information of a string that the user has typed information in. I want only the Subvi executing structure case if the Boolean value on the main vi it true.

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  I'm sure I'm missing something very obvious, but I was not able to understand using the forum and help of NOR.

  Any help is appreciated, thanks.

  I uh... I did a video on this subject. I hope you don't mind.

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  Let me know how you go.

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