Thermocouple Measurement Error

I'm working on a DAQ system that has 32 analog and 32 thermocouple channels. The analog channels work fine, but the thermocouples are giving us a weird "stairstepping" effect. As can be in the attached chart of a sample dataset, the thermocouple readings remain steady for a short
time (with noise and sometimes a slight slope) and then jump to another value.
After the reading stairsteps to the new value, it will stay around that
reading for a short time until it jumps again. In working on this problem we’ve
come up with the following:
The effect seems follow the trend of
what the temperature is doing, it just doesn’t read the right temperature at all
times. Drawing a line between the stairstep points would probably give us what
the temperature profile is actually like.
The effect only happens on the
thermocouple data, and the time delay between stairsteps is much longer than our data rate.
Connecting a thermocouple to all 32
channels did not do anything to correct this
effect. We see the stairstepping no matter how many of the channels we leave floating.
If we assume that it’s not a
software issue, what would the next step be in troubleshooting? For your
reference, we’re using a SCXI-1600 USB device connected to an 1101-C
thermocouple box. Any help you can offer would be
appreciated.
Attachments:
Stairstep.JPG ‏41 KB

HI cm_opi,
I'm quite curious as to what you sampling rate is, and what your number of samples is- could you please post those numbers? Another question I have is, what kinds of thermocouples are you using? Have you tried using any different thermocouples. Or, is it possible for you to try out a different terminal block with the thermocouples you have? Please let me know, thanks!
aNItaB
Applications Engineer
National Instruments
Digital Multimeters

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DATA:gs_bapimathead          TYPE bapimathead,
     gs_clientdata           TYPE bapi_mara,
     gs_clientdatax          TYPE bapi_marax,
     gs_plantdata            TYPE bapi_marc,
     gs_plantdatax           TYPE bapi_marcx,
     gs_forecastparameters   TYPE bapi_mpop,
     gs_forecastparametersx TYPE bapi_mpopx,
     gs_valuationdata        TYPE bapi_mbew,
     gs_valuationdatax       TYPE bapi_mbewx,
     gs_salesdata            TYPE bapi_mvke,
     gs_salesdatax           TYPE bapi_mvkex,
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     gs_storagelocationdatax TYPE bapi_mardx,
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     gwa_materialdescription TYPE bapi_makt,
     gt_taxclassifications   TYPE STANDARD TABLE OF bapi_mlan,
     gwa_taxclassifications TYPE bapi_mlan,
     gt_prtdata              TYPE STANDARD TABLE OF bapi_mfhm,
     gwa_prtdata             TYPE bapi_mfhm,
     gt_prtdatax             TYPE STANDARD TABLE OF bapi_mfhmx,
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     gt_unitsofmeasurex      TYPE STANDARD TABLE OF bapi_marmx,
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         vkorg(4),    "sales org
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         ktgrm(2),    "acc asgn grp
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         meins(3),    "base uom
         tragr(4),    "tarns grp
         matkl(9),    "mat grp
         spart(2),    "division
         ntgew(13),   "net weight
         gewei(3),    "weight unit
         werks(4),    "plant
         ladgr(4),    "loading grp
         dismm(2),    "mrp type
         mtvfp(2),    "available check
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         dispo(3),    "mrp controller
         beskz(1),    "procurement type
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         mtpos(4),    "gen it gross grp
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      data_tab                = gt_itab2
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      file_open_error         = 1
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      header_not_allowed      = 9
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          gwa_itab1-vkorg
          gwa_itab1-vtweg
          gwa_itab1-kondm
          gwa_itab1-ktgrm
          gwa_itab1-dwerk
          gwa_itab1-meins
          gwa_itab1-tragr
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          gwa_itab1-gewei
          gwa_itab1-werks
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          gwa_itab1-dismm
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Hi Aparna..
even with HUR also i am getting same error.....
is there any changes required in the SPRO .......
i mean in BAPI had ..unitofmeasure we have around 21 fields( here extra fields is DEL FLAG)
                      but in unitofmeasurex has only 20 fields...
we need to anything in SPRO for avoiding DEL FLAG.....
sorry if i am confusing u.....
thanks for responce and send few more inputs for resolving the issuee....

Unit of Measure Error in Purchase order

Hi Gurus,
While saving the Purchase order i am getting the Error message
"Unit of measure KG not defined for language GB."
We are trying to place this PO outside the US .PR already created and released.But when i am converting the PO and saving it gives me this error .
Thanks a lot in Advance
Edited by: Metroid01 on Jul 23, 2009 12:55 AM

How do i create the UOM in CUNI for the specific language? I can see the below
Int meas unit---->KG
Display
Commercial--->KG
Technical----> Kg(in Po it is taking g is lower case)
in ALE/EDI--->ISO Code is EA.
Can you check this if it is the right set up in config.
Thanks a lot for the help.

Noise in thermocouple measurement using PCI-6024E DAQ card

I am using a PCI-6024E DAQ card for thermocouple(TC) measurement. The
TC is installed in the mold cavity of an injection molding (IM)
machine. The leads from the TC are connected to the DAQ card using a
CB-68LP board. I made a temperature mesurment task in LabView 7.0
with the two leads from TC as differential inputs and used CJC value of
25 deg C.
The problem is that when the IM machine is OFF, I get a reasonable temp
reading with some slight noise but as soon as I turn ON the IM machine,
the temp readings go wild with a lot of variations around the mean
value. The temp values also don't go to higher values when the TC is in
contact with the molten plastic in the IM machine.
Do I need to ground something here or put a resistor in the I/O board?
BTW the IM machine is grounded and the TC give correct temp values when
connected to a hand-held temp reader.
Any help will be highly appreciated.

Hello Aftab,
Looks like you need to use bias resistors to reduce the noise. Check out the following tutorial for more information about how to use bias resistors.

Measurement error in reading Encoder Pulses

I am using PCI-6601 card to read a Linear Encoder which gives 2000 pulses per mm of distance.The accuracy of the Linear encoder is 2Microns.In my application I am measuring a distance of 7mm.But the card is reading with an error of 30 to 50 Microns error.We had checked up all the factors related to mechanical and Encoder.In fact the same application was earlier working with Advantech Encoder card which has provisons to connect the A,B,A Bar,B Bar inputs from Encoder.There was an accuracy of 0 to 5Microns.But the application was replaced with NI Card because of the continuous problem of the Digital I/O Card used from Advantech.
Mail me the possible causes and also the troubleshooting procedures for correcting the above problem

Hi,
What I think is happening is there might be some noise on your signal lines. The PCI-6601 counters are capable of detecting a pulse as small as 20ns. If the Advantech card can't detect pulses at that small a resolution, it might be ignoring "noisy" pulses that shouldn't be there. Are you reading more pulses than you should be or less?
There are a couple things I might be able to suggest to clean up your signal. The counters support several different encoder modes. Try using X4 Encoders. An X4 encoder counter increments or decrements on each edge of channels A and B. Whether the counter increments or decrements depends on which channel leads the other. Each cycle results in four increments or decrements. I believe this X4 mode is more noise resi
stant than the standard mode.
Another thing you might want to consider is applying a filter to the input signals (debounce or deglitch filters). Each PFI line coming from the I/O connector can be passed through a simple digital filter. The filter operates off a filter clock and a fast internal sampling clock. It samples the signal on the PFI line on each rising edge of the sampling clock. A change in the signal is propagated only if it maintains its new state for at least the duration between two consecutive rising edges of the filter clock (one filter clock period). The frequency of the filter clock determines whether a transition in the signal may propagate or not.
6601/6602 User Manual
http://digital.ni.com/manuals.nsf/webAdvsearch/DD0DBB6404BC139886256721007CF16D?OpenDocument&vid=niwc&node=132100_US
Hopefully one of these suggestions will do the trick. Have a good day.
Ron

Thermocouple Measurement Error

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