Measurement of the hysteresis with metal plate

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• Measurement of the temperature with the PCI-6229

  I was announced in an old thread and do not receive and answer, so I thought I try a new.

  Link to the old thread: http://forums.ni.com/ni/board/message?board.id=250&thread.id=14920&view=by_date_ascending&page=1

  I'm trying to measure temperatures using thermocouples using the PCI-6229 and I use two SBC-68LPR to make the connection.  They are not reference on them joints.

  After moving down from enugh to careful reading of the old thread I mentioned above and I think I knew what I should do.  Here's what I do now:

  Create a task - DAQmxCreateTask

  Create a channel for this task - DAQmxCreateAIThrmstrChanVex thermistor

  Create a number of channels of thermocouple for this task (DAQmxCreateAIThrmcplChan) using the cjcsource DAQmx_Val_Chan option and specifying the string thermistor as the source channel

  Start this task - DAQmxStartTask

  Get the temperatures - DAQmxReadAnalogF64

  Stop the task - DAQmxStopTask

  Disable the task - DAQmxClearTask

  I have not yet hooked, but I doubt that it is the cause of the error.

  A few more details (pardon my Delphi):

  Create the channel of the thermistor

  TmPcName: = ' Dev1/IA.19 ";

  Secret: = DAQmxCreateAIThrmstrChanVex)
  TcTaskHandle, / / task handle
  @TmPcName, / / physical channel name
  @TmChName, / / name of channel
  -80,                                   // Min range
  80,                                    // Max range
  DAQmx_Val_DegC, / / units, ° C
  DAQmx_Val_ResistanceConfiguration_4Wire, / / 2-wire, 4-wire, etc.
  DAQmx_Val_ExcitationSource_External, / / source of excitement, external
  1, / / value of excitement
  9.376e-4,                         // a
  2.208e-4,                         // b
  1.276e-7,                         // c
  30000);                            Resistance of reference

  Creation of the channel of thermocouple:

  TcPcName: = ' Dev1/ai23;

  Secret: = DAQmxCreateAIThrmcplChan)
  TcTaskHandle, / / task handle
  @TcPcName, / / physical channel name
  '',                                     // Channel name
  0,                                    // Min range
  1000, / / Max range
  DAQmx_Val_DegC, / / units
  DAQmx_Val_DegC, / / type of Thermocouple
  DAQmx_Val_Chan, / / source CJC
  25, / / value of CYC, so DAQxm_Val_ConstVal
  @TmPcName);             CJC channel, so DAQxm_Val_Chan

  It looks like 4 scales is required for voltage excitement thermistor measurements.

  In addition, it seems that external excitation is necessary in my case, PCI-6229.

  Everything works if I use a CJCConstant.  When I do this I use the same code to create channels of thermocouple, but I spend creating the channel of the thermistor.  When I try to use a CJCChannel I get an error saying "value required is not supported for this property value," which occurs when I call DAQmxStartTask.  I don't have no idea of what this message refers to and the best I can tell the properties that I've specified sense.  The constant termistor are from actual thermistor, that I found on travailleursduweb.com.

  I could also use some help to know how to connect the thermistor.  Looks like I need to fab, a thermistor circuit myself, with a stable voltage to power the termistor and use a double-ended analog and reference to the channel.

  Thank you

  Mike

  The error of thermocouple type was a type-o in the post.   Thanks for catching it.

  I think I found the problem.

  I wrote a small program to test for Thermistors and I went to using the routine exctation of tension for a common routine of excitement (... IEX instead of... Vex).  I had been by specifying a minimum value less than 0.  I changed it from-80 to 0, and it works now.  However, I got an error in division by zero, intermittently, when you read a thermistor channel.  The error is not in my code.  It occurs when you call DAQmxReadAnalogF64 for the first time and I'm not all mathematical related to this call.  I'm still looking into it.

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  2 and then using the software amplification instead of the amplifiers?

  3. What is the best approach to collect values PQRST?

  software: Labview 2014 with all modules

  1. it depends on the output voltage of the sensor there.

  2. you can amplify the signal in the software, but if the signal is too small, you may have a problem with the resolution, you would like to use the whole range of ADC in myRIO to see something useful.

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• How to control of the screen with a list of scroll-able patch?

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  I would like to have control of the screen that displays a scroll-able list of all patches in my Concert.

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• I got the watch aluminum gold. The soundtrack has metal fittings of color gold. Are there strips of spare with accessories of color gold?

  I got the watch aluminum gold. The soundtrack has metal fittings of color gold. Are there strips of spare with accessories of color gold?

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  Bands with colored pins but are not currently available for sale separately.

  The current lineup of the band is available here:

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• Measured values of task not aggreeing with the measurements of the test Panel

  We read (with excitement) accelerometers using modules PXI-6254. Initially, we thought that we were see shift CC and we were and we filtered. Now, if we measure the sensor output at rest with an O'scope we read uV. For even if we read the channels with MAX test panels we also read some uV. But when we do the DAQmx tasks and look at the tensions of the task to MAX (same sensors at rest), we see readings of up to 25 or 30 mV - orders of magnitude higher. Can anyone suggest what may be the cause?

  (I enclose a word with screenshots represetative doc)

  Thank you

  lmd2

  How many channels are tailor-made and at what rate?  What is the output impedance of the accelerometer or filters, you have between the accelerometers and the 6254?

  It is possible that you run into error when paying.  The specifications for the PXI-625 x cards has a chart showing the expected setting vs error track-to-track interval various sources.

  A way to test this would be to slow down your sampling rate.  If the error decreases as you slow down the sampling frequency, it's a good bet that you run into a problem of setup time.

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• Strange problem with measurement of the color under Mac.

  Hello, I have a strange problem with measurement of the color under Mac. For example I create a gradient in Photoshop color 200 200 200 color 240 240 240. When I measure the color of the gradient with the Photoshop color measurement tool or with the built in OS X color measurement tool measured color is of 200 199 197 to 240 240 238. I measured the same gradient with Photoshop for PC and the values are OK (the same values that I create).

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  These instructions may be of any Dell desktop, the office in question is a Dell XPS 8700.

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  4 stop.

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  7 run msconfig.exe to change normal startup.

  8 re-boot (started fine normal start-up).

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  10 success, XPS 8700 AHCI HHD boots without any problem.

  11. I then used Acronis True Image HD provided for free with the 1050 GB Crucial SSD to clone the 2 TB drive (650 GB used). Important do not use Acronis in Windows mode but create and boot from a bootable USB key. Community.crucial.com/.../172487

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  Hi guys,.

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