Noise thermocouple with PCI-6230

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• Acquire thermocouples with 6062E DAQ

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  I wonder to acquire a bunch of thermocouples with a map of 6062E DAQ (and SC2345) but I wonder if it of possible or not. The smaller input range is 100mV and with a resolution of 12bits, it gives a resolution in volts of 0.0244 mV or 24uV. If I compare this value with the K type thermocouple NIST table (in degrees celsius):

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  Your problem must come from your sensor.

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  http://digital.NI.com/public.nsf/allkb/8166630BD6965EEA86256FDD0052E89C?OpenDocument

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• I use pci-6221, I need her to interface with thermocouple with voltage up to 5v

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  You have your task to acquisition of data configured for the mode differential or asymmetric acquisition for the analog input?

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• Synchronization of the signal with PCI-6602

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• Voltage corresponds not counter in the terminals on SCB68 with PCI-6254

  Setup: I have a PCI-6254 measuring 10 channels, differential all connect. 0-4 and 16-19, with SCB-68 2s and armoured and other cables.  Entered 0-4 have pressure sensors that turn off 0-10 V air-conditioned and equipped with the same commune.  The seams of the configuration to work, but I have a strange phenomenon.  When I put 30 lb/PO2 three input I get 6.149 VDC measured with a meter on the SCB-68 and something very close when I watch the raw tension out of Labviw (BTW, 2010).  If I provide 30 lb/po2 at the two entrance he see the voltage according to LV to 6.04 VDC on channel 3.  Tension with the meter is always 6.149 VDC on channel 3.  LV then reflects the pressure went down on this station, but I checked with an external meter does not have.

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• problems syncing multifunction with PCI-6229

  Hi, I use PCI-6229 and LabVIEW 8.0 for synchronized of the thermocouples and voltage measurements. The diagram is attached here. Here are my questions:

  (1) with the analog inputs of TC is ranked very first and followed with inputs analog voltage, as shown in the diagram, it works fine. But once the tension AIs are placed first and followed with AIs for thermocouples, thermocouple reading makes no sense, for example telling 25 deg C, the program shows strong fluctuating temperature 10-80 deg C.

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  Hi Matt11,

  (1) the order that you specify strings in your task will affect the order of scanning.  In other words, when you add the channels voltage before channels of temperature, the material can enjoy the tension or s channels followed by the string (s) temperature.  Since the 6229 is multiplexed, it comes to each channel sequentially switching in a single ADC.  In your case, it seems that the tension on the ADC to measure voltage not had time to resolve completely prior to taking the measure of temperature.  We refer to this sometimes as ghosts in extreme cases where the value measured on channel b mimics the tension on the channel.

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  I'm a little surprised that you see errors because of it (generally, the problem comes from a signal source of high imepdance measure or when sampling at higher rates), but then again, the temperature measurement would be very sensitive to small voltage fluctuations since you deal with thermocouple voltages at room temperature.  Given the order of scanning affects your measure the problem is almost certainly introduced leaving not enough time for the ADC to settle after reading your string tension.

  (2) ticks means actually timebase tick rather than the graduations to sample.  The minimum is always 2, but this match 2 graduations of 20 MHz (100 ns) time base from which the sample clock (unless you choose otherwise or specify a sampling rate less than 20 MHz / 2 ^ 32), instead of 2 graduations of the 1 kHz sample clock (2 ms).  In fact the trigger is probably performed asynchronously at the base of your time, if you are anywhere between the graduations of 1-2 the basis of delay time (50-100 ns) according to the relative phase of the trigger to the time base.  If no time limit is set, the default value according to me is still 2 ticks which is the minimum that allows hardware (you can check on your own by reading the property node if you wish).

  These points should be compatible between different driver versions, with the exception that DAQmx chose by default convert rate differently in earlier versions of 7.4.  Select the conversion rate is a compromise between the settling of deadlines and the channels are sampled how "simultaneously" on the MULTIPLEXED Board.  The final result in point 7.4 of DAQmx was a compromise apparently arbitrary add 10 US for the minimum conversion period and use this as the maximum by default between the channels.  The user can of course always set the clock to convert to all what best fits their application (in your case, you might want to allow a settlement more between each channel).

  Best regards

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