NEITHER 9237 to RVDT R30A

Similar Questions

• NEITHER 9237 external excitement - VeriStand 2013 SP1

  The voltage recommended for my pressure is + 10 VDC sensors. I prefer to use external excitation according to the NI 9237 manual, total power to the module is limited to 150 mW, which in my case is "four bridges complete 350 ohm at 3.3 V. (I'll use pressure transducers (4) 350 ohm full bridge). I use scanning for EtherCat engine and the NI 9237 in a chassis 9144 OR connected to a cRIO-9081. For troubleshooting, I have two transducers on a pressure calibrator and another RJ50 connection a NI 9949 escape. If I select "External excitement" and have my power supply of 10 V connected to the bass + EX, EX-connecteur, I get an invalid value for my pressure sensor. It is after the scaling of the calibration value. The gross value is also incorrect. If I let the value "External excitement" but shoot the EX +, EX-connecteur, the EX +, EX-tension (pins 6 & 7) will go to 4.735 V and I'll get a CORRECT pressure reading. If I select an internal 3.3V excitement, I'll get a statement of the correct pressure, but I am a little concerned about the resolution that recommended excitement is + 10 VDC for the pressure transducers. My question is: Why can't I use the external excitement? I have another application with a chassis PXI and EtherCAT and it works OK. I also tried to place a NI 9237 module in the chassis cRIO-9081 and get the same invalid value that I describe above.

  You have the latest version of the scanning engine and EtherCAT custom device? On the community page for this custom device, the last listed specifically done bug fix reference to this module. There is also a specific forum for this custom device which may be a good idea to post on as well if you have not already posted here about this problem.

• NEITHER 9237 and SignalExpress

  I have a cDAQ-9174 with modules OR 9237 with SignalExpress 2011 for strain gage measurement. After a few problems and doing some research on this forum, I discovered that the minimum sampling frequency for the NI 9237 is 1613 samples/second. However, I need a sample of about 1-5 samples/second rate as my tests will be the order of 4 to 5 hours and record 1613 samples every second will make my too big data file. On the forum, I found these workaround solutions:

  Subset and resampling (http://zone.ni.com/reference/en-XX/help/371268M-01/expresswb/subset_and_resample/) seems to be the most recommended, however I have a few questions about this. I selected a range of subset of 0s to 1s and then choose a resampling of 200 Ms. that seems to be the more manageable sampling frequency, but then I have a problem with the export of the data collected. I get a message that says I can't export to Excel, as the data are 'not continuous' and can only convert to text. However, the text file is not really useful as it breaks down the data in individual games and puts the time in terms of dt. For small sets of data, it seems that it would be possible to manually determine every moment given by point, but I will receive a large number of data sets. I have tried uncheck the "optimize to run once" but still not the same type of data file. What makes a kind of aggrivating, it's in SignalExpress data view tab can display a graph of deformation over time, that I need in Excel.

  Another recommendation is to use the 'Statistics' using the collected samples, then changing the number of samples to change the rate. However, I prefer not to use this method because it seems to imply "at x time, average of the latter strain is y" rather than 'x time, strain is there' and I want just the value of the strain at every 0.5 s, 1 s, 1.5 s and so on (although I guess that how that differ from the subset and resample method?).

  The last recommendation I found suggested to use an N-sample acquisition, set to read two samples and then set a delay of acquisition of post about 1000 m that would have been a nice solution, but it seems that SignalExpress impossible to compile all the samples to read a log file, that I have seen only two data points when I opened it in Excel.

  I'd appreciate any help, thank you.

  Hello MAF101,.

  I ran your own project and it worked for me. I just used the following values:

  

  It worked very well, I managed to turn on logging. Then, I tried logging information in a txt file using the instructions below:

  

  I got the attached file below using a relative timestamp. It connected two samples per second.

  Concerning

  Frank R.

• NEITHER 9237 quarter bridge absolute accuracy

  Given a NI 9237 bridge completion Module with NI 9944 accessory Terminal strain gauges and 120 ohms with GF = 2.11, how calculate we precision of strain?

  I was told that the absolute accuracy for bridges of quarter is given by

  Absolute accuracy = (Gain error * reading) + (error offset * range) + noise + half bridge watchkeeping tolerance tolerance.

  Since I'm on the NI 9944, watchkeeping tolerance would be 500 uV/V (given by OR R & D). The tolerance of half bridge is given in the manual OR 9237 being 1.2 mV/V.

  (1) it has no value of 'Noise' of entry for bridges on watch in the NI 9237 manual; We use only the sound of half-bridge?

  (2) if I use a sample rate of 1,613 kech. / s (the rate guaranteed valid sampling for the NI 9237 module) and my system is always in his 1st year of use, always is my gain error 0.05%? It is worth noting that 0.05% applies to the 50 kech. / s ; If the gain error does not apply to my low sampling frequency, how can I find the error of gain?

  (3) if my maximum/minimum deformation measures around 600 EU (microstrains), how can I change my values "Reading" and "Range" in the equation for absolute accuracy above, if they need to be adjusted?

  (4) why the absolute accuracy for a quarter-bridge set up does not include the half bridge tolerance?

  (5) is the equation for the conversion of precision of voltage precision for quarter of a bridge, of the strain , where U is the precision of the voltage given by the equation of absolute accuracy above.

  Example of calculation using the values assumed for quarter-bridge:

  Error error/gain Offset = 0.05%

  Reading distance / = 25 mV/V

  Half bridge noise = 1.6 mV/V * 3

  Half bridge tolerance = 1.2 mV/V

  Tolerance of watchkeeping = 500 uV/V

  Absolute accuracy = (V/V 0.0005*.025) + (0.0005*.025 V/V) + ((1.6e-6) * 3 V/V) + (1.2e - 3 V/V) + (500-6 V/V) = 25 mV/V +/-1.73 mV/V

  Accuracy of the strain =-4(V/Vex) / GF (1 + 4 (V/Vex)) = - 4 * (25 mV/V +/-1.73 mV/V) / (2.11) * (1 + 4 * (25 mV/V +/-1.73 mV/V))

  How to simplify this precision of strain to get a reading + / range of precision?

  Thanks for any help.

  (2) if I use a sample rate of 1,613 kech. / s (the rate guaranteed valid sampling for the NI 9237 module) and my system is always in his 1st year of use, always is my gain error 0.05%? It is worth noting that 0.05% applies to the 50 kech. / s ; If the gain error does not apply to my low sampling frequency, how can I find the error of gain?

  This applies at a rate of 50 kech. / s. lower data rate can have up to 0.20% gain additional error reading.  This can be found on page 24 the unit operating instructions and specifications document

  You get to know how to calculate what percentage of Reading (Gain error) I'd get according to what sampling frequency use? Otherwise, I guess I could use the error of gain of 0.20% in the worst case scenario.

  Yes, I so calculate the error of Gain for the worst case scenario (0.2%)

  (5) is the equation for the conversion of precision of voltage precision for quarter of a bridge, of the strain , where U is the precision of the voltage given by the equation of absolute accuracy above.

  Yes, I think it's the correct equation.

  It is more a matter of math - since you will be in the form of a reading + / a range (for example 25 mV/V +/-1.73 mV/V), do you know how I simplify or interpret the accuracy of strain after its replacement by the U-value?

  Accuracy of the strain =-4(V/Vex) / GF (1 + 4 (V/Vex)) = - 4 * (25 mV/V +/-1.73 mV/V) / (2.11) * (1 + 4 * (25 mV/V +/-1.73 mV/V))

  Just reuse the worst cases to calculate positive and negative values on 1.73mV.

• NEITHER 9237, map of the c series

  
  

  Yes, the change of measure may mainly be due to the precision.

  I think that load cell specifications contain details of precision. It is usually in % of the maximum nominal weight.

  Trust that helps

• NEITHER 9237 Raccordementdu external excitation

  Hello

  I work with labview 8.6 and using a NI9237 mounted on a chassis.

  I use 4 guauges of strain with a voltage of 10V for which I need to connect an external excitation source.

  I can't find a way to do this? There are 2 boxes of samll with some connection terminals, but I don't know if I'm doing things.

  Also, do I need to change my connections in any way when I use an external excitation source?

  Karthik85:

  It is not black magic. The constant reading you get is actually the value of mv/V. Which must be multiplied by the corresponding voltage for the mV reading. Read this article and if all goes well he will clarify all black magic.

  http://digital.NI.com/public.nsf/allkb/21CA039D8F43C5188625729F005AC2F7

  Best,

  Santiago

• Measurement of the hysteresis with metal plate

  Hi all. I have the task of understanding. I want to measure the hysteresis of elastic coupling. To the couple measure I two strain gages on 90 degrees (NI 9237 bridge half, II). After calculation, I now have the couple. In the other hand I measure angle of rotation of the motor with a metal plate with 52 teeth (gear). Angle of rotation I use input digital OR 9401. Hysteresis of bild, now I must on each tooth torque couted. I tried the example Multi - multifunction - Ctr Retrigg a generation sample clock Pulse Train HAVE but still graf give me the straight line. Can someone help me with this? Are there more better example for me, or clips in internet to show me how to do? Thanks before.

  This is this case, the problem may be, the data acquisition card cannot rearm the fast enough triger either acquisition takes too long.

  In the configuration of the screenshot I see you want to acquire 100 samples at 1 kHz. This means that each acquisition will be at least 100ms which might be too long for your application. NEITHER 9237 supports a maximum rate of 50 kHz, so my first sugestion would be to simply increase the sampling rate and see if it helps.

• Accelerometer for several modules in a cRIO

  Dear all,

  I try to connect my model 805M 1 accelerometer (form is attached) to one of our cRIOs in lab, I think I need some advice because we have two cRIOs and bunch of modules I want to use them instead of buying another module. We have these controllers and modules:

  NEITHER cRIO-9073

  NEITHER cRIO-9024

  NEITHER 9265

  NEITHER 9237

  NEITHER 9205

  NEITHER 9203

  I think I can excite (he needs 3 v to 5.5 v) the acceleremoter with for example NI 9237 and read it with NI 9205. Am wrong me or is there another combination that I can use?

  I appreciate your help.

  Best,

  Bardiya

  BAK777,

  Yes, you can use the NI 9237 module to provide the voltage using a custom voltage customized by excitement and ignore the input data for this task. You can read in the output voltage of your accelerometer on the NI 9205 module.

  According to the characteristics of the accelerometer signal, it might be useful to research using an Analyzer of dynamic signals (DSA) module, such as the NI 9234, which is made for the acquisition of accelerometer data applications.

• Why is the data synchronized out of phase

  I'm trying to sync my calendar with a NEITHER-9237 and a NOR-9244 in a C chassis - daq 9178. When I'm not synce synchronization using BD1 (block diagram) it produces this Chart1 XY (data in phase I research). However, to change the data to synchronize acquisition BD2 (block diagram) it produces this Graph2 XY (not the same XY data figure 1).

  All the information to fix this error would be appreciated.

  Just answer for the most recent message - no time now to carefully dissect any advance information.

  First and it of quite a nonfunctional nitpick, but would it not less confusing to put the

  initials HAVE config calls * Sub * the encoder configuration calls so that you would not have to cross the streams?

  Secondly, it seems that youv'e ' e configured your task of coder to make its sampling based on the

  «"" "Sample clock of IT.»»»"  Good so far.

  The call to perform Nulling incur the subsystem HAVE.  I'm assuming that it uses your

  other settings for config task (for example, the sampling frequency) in the process, so you start generating

  Sample of AI clocks implicitly generating in turn encoder samples.

  Sides are the Nulling operation will then stop the sample clock when it's done - it's the

  normal behavior for automatic start-up operations DAQmx.  So here's what * I * will try:

  Perform removal * before * starting the encoder task so that the task of the encoder collect

  samples while you null your bridge.  As a precaution, call DAQmx Stop for your task to HAVE

  just after deletion.  * Then * start your task of encoder, and then finally (re) start your HAVE

  task.

  -Kevin P

• module or

  This module which can measure the pressure of the pressure transducer and the strength of the load cell other than analog or 9219@universal?

  Hi Darul,

  It is best that you ask the question in another forum this is the forum of academic hardware products. Since you mention NI 9219, I guess that you already have a Compact DAQ chassis. If you want to measure the scale you can use NI 9219 or NI 9237 (http://sine.ni.com/nips/cds/view/p/lang/en/nid/208791). NEITHER 9237 can connect to a half-bridge or full-bridge sensor. So, you will need to check the charge of the specification of the cells, which are typically full-bridge sensor.

  For pressure sensor, this will depend on the conditioning of signals required for the pressure sensor. Thus, you will need to provide the specifications of pressure sensor before I suggest any module. Usually a pressure sensor will require type of PEAK conditioning of signals, and for this, you can use the NI9234 (http://sine.ni.com/nips/cds/view/p/lang/en/nid/208802). A pressure sensor comes also equipped with the transmitter (which is a signal conditioning module) and the output voltage (usually 0 - 10V) or current (4-20 MA). For this type of pressure sensor, you can use NI 9201 (http://sine.ni.com/nips/cds/view/p/lang/en/nid/208798) for the measurement of the voltage or the NI 9203 (http://sine.ni.com/nips/cds/view/p/lang/en/nid/208805) for current measurement.

  Rando

• USB not recognized of 9237

  I have a new USB-9237 with 9162 carrier, when I plugged the device was not recognized.  NEITHER DAQmx 9.2.1 worm was installed before I plugged it, all I get is green light only flashes on the 9162.  I went the 9237 with a 9239 and this device is recognized.

  Measurement and automation explore worm 4.7.1

  any thoughts or suggestions would be appreciated

  Jesse

  Hello, JENO,.

  The version of the NI 9237 with d - SUB connector is not supported in the chassis USB-9162.  It is because the device uses a different product ID and would need a different firmware, which is not currently supported.  In order to use a NI 9237 module into a USB-9162, you need to use version RJ50, not d - SUB version.

  Kind regards

• calibration OR 9237-200077

  I'm trying to calibrate the NI 9237 + NOR 9945 quarter bridge extensometer or max.

  I get the error-200077 occurs calibration of strain meters.

  Possible reasons:

  Requested value is not supported for property value,

  Property HAVE. Min

  Asked the value - 1.0E - 3

  Valid values begin wih 18.8988984e - 6

  Valid values ending with 103.843984e - 3

  Channel name: strain

  I've tried everything, the meter of different strain, different 9945 9237 different, different cables, different computers. everything.

  I changed all the settings I found in or max.

  I searched the forums and inernet and what is there is not help.

  Any ideas?  Please?  I'm so desperate.

  I just got the same error message again and again.

  What went down: when I set my limit min between the highest and lowest allowable values specified in the error and then dialog window have been, I had the same mistake all over again, but the highest values and more allowed bass displayed in the window had changed to completely different numbers.  This happened several times.  No matter what I put my limits, allowed values min max always change, so it would be mistake every time regardless of what I entered.  Sometimes he complain on the gain of shunt calibration factor, he couldn't put it is '+ inf' or '-inf '.  Looking closely at the calibration window, I noticed that NEITHER MAX read the same value of strain, with or without, the resistance of the shunt connected.  When the calibraion subtracted Y2 - Y1, he got zero, and the opposite of zero is started.  This is when I knew for sure it was something my son and began the search in there deeper.

  Cause: short in the wires running to the extensometer.  When the specimen has been assembled and bolted on the luminaire, the wires were hidden so that nobody could see them, and they were crushed between two metal components.

  Solution: look for shorts or other problems in the wiring itself extensometer. I imagine that if the strain gage circuit is open, you would see probably the same error of MAX NOR in this case as well.

  Recommendation: I ask OR to add more useful information in the dialog box for error, to offer the user to check the wiring, etc.

• How to set the voltage on a 3.3 volt NI 9237 module?

  Hello

  How to set the voltage on a 3.3 volt NI 9237 module?

  The voltage is now at 2.5 volts.

  This is my first time with this camera.

  This set of MAX or are there jumpers?

  I want the value of the excitation voltage at 3.3 Volts and do not change.

  The NI 9237 is a NEITHER cDAQ-9172.

  Thank you

  Bill

  Hi POBA,.

  This can be set to your programming environment.  For example, LabVIEW Signal Express, a task of MAX, or a DLL call in a text-based environment.  You want to create a strain, tension Custom with excitement, or any bridge based task in any environment.

  "" "In MAX, right-click on your device and choose create a task" acquire signals "analog input"...

  "" "In LabVIEW, place a DAQ Assistant" acquire signals "analog input"...

  "" "In Signal Express, add a step for Acquire" DAQmx Acquire"analog input"...

  In any C language based, you will want to call a function such as: DAQmxCreateAIVoltageChanWithExcit, DAQmxCreateAIStrainGageChan, DAQmxCreateAIBridgeChan

  You can then specify the Source of Exictation to be internal to 3.3V.

  Best,

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