Measuring temperature and acceleration simultaneously

Hi,
I am having problems getting a correct and stable temperature measurement, I think the acceleration measurements are correct. I am using a daq PCI 61110 and the temp sensor is a type-k thermocouple I tried switching the thermocouple with a probe but the result did not change and I have checked the examples to see if I have gotten something wrong in my code but I can't seem to find it. Please could somebody help me and the vi is attached below.
Solved!
Go to Solution.
Attachments:
MultipleChannels_Created.vi ‏70 KB

I don't know your DAQ card, but I assume you are measuring in the voltage range for the accelerometer and them try to measure in the µV from the TC.
If you have channel crosstalk, your weak signal from the TC gets buried in noise.
Try to have some input channels connected to GND inbetween, maybe that helps.
Wait, I took a look into the spec (BTW 6111 or 6110??) your minimum resolution is 98µV, that would equal around 2K resolution, accuracy is 353µV (around 8K with type K TC ... not quite the right card for a thermocouple reading!!) Well and you don't have a CJ compensation....in other words: You don't have the right DAQ for thermocouple readings.
NI has a USB thermocouple device that woul fit your needs and is not too costly... or use a B5 module or other thermocouple signal conditioner with a 10V output.
Depending on your needs maybe a small NTC with a resistor as an voltage divider can be used to measure temperatur ...
Greetings from Germany
Henrik
LV since v3.1
“ground” is a convenient fantasy
'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'

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Can not measure temperature and voltage simultaneously

I am a beginner with labview. I want to measre temperature and voltage simultaneously. When I run
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Attachments:
heatflux.vi ‏1069 KB

Since I don't know your exact configuration I will make some basic assumptions based on how it appears that you have configured the DAQ Assistant Express VIs.
Assumptions:
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2. You want to scan continously
3. You want to acquire 3 temperature channels at a rate of 1000S/s and take 100 readings at a time
4. You want to acquire 2 voltage channels at a rate of 1000S/s and take 1000 readings at a time.
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I don't have a DAQ board installed so I can't confirm with certainty if I am correct but you can do this by simply changing the DAQ Assistant properties. In the 'Task Timing' tab change from 'Acquire Continuosly' to 'Acquire N Samples'.
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It's ok to scan all channels at once even though they might not be of the same type so go ahead and configure all your channels in one DAQ Assistant call and get rid of the sequence structure. Decide on one set of parameters for Scan Rate and Samples to Read, in your case I doubt this will be a problem. Since you are performing the same analysis on all channels you don't need to parse your data simply pass the 'data' from your DAQ Assistant into a single 'Amplitude and Level Measurements' Express VI. You will now have a single array with all your Mean values based on the order the channels are configured. If you want to plot the data in different graphs all you need to do is parse your channels using the 'Split Signals' or 'Select Signals' Express VI.
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Measuring voltage and temperature

Hallo,
I've got the problem of measuring voltage and temperature simultaneously, with diferent numbers of samples. I want to use two of the "DAQmx write", but then the error "The ressource is reserved" appears.
Software: Labview 8.2.
Hardware: NI cDAQ - 9172
NI 9211 (Temperaturecard)
NI 9201 (Voltagecard)
How can i fix it?
Attachments:
Fehler.JPG ‏89 KB
Fehlerbeispiel.vi ‏27 KB

Hello LochiMD,
there are sereral things you have to care about.
The best would be, you have a look on the following link:
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https://decibel.ni.com/content/docs/DOC-12182 (Have a look on the picture, especially left side)
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Best Regards,
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Hi,
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By reading this page I have learned that how I can create a task for temperature measurement using thermocouple with a certain NI device.
http://www.ni.com/white-paper/14338/en/
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I am working on getting just the counter working by using
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Attachments:
Counter_error.jpg ‏45 KB

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Can I measure temperature using 6013 & 68LPR?

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I answered this questions over here:
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Diffrence between Measuring point and Counter

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Hi,
_Measuring Point_
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How can i measure temperature using thermocouple using labview?

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There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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Measure 16 strain gages simultaneously with SBRIO 9626 + 2 NI 9235 modules

Hello everyone,
I am currently working on a deformation measuring application. I need to measure 16 strain gages simultaneously, using a SBRIO 9626 + NI 9693 (two C Slots) + 2 NI 9235. I started checking out the example included for measuring strain with shunt calibration on 4 gages with one 9235 module through the FPGA, modded it to read 8 gages without any issue.
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thank you.

Hi s.jimenez
First of all, thank you for your prompt answer. Regarding your suggestion, i hadn't checked the Basic Synchronizing NI 923x example, my bad . After reading and understanding it a little, i tried to adapt it to my situation, sadly with no success. Some of the mistakes that i corrected were:
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summing up, i havent been able to obtain continuous readings from the second module, any additional help could be greatly appreciated.
best regards.

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Are your TCs floating or grounded? Basically, if your TCs are mounted to a metal test article and the object is grounded to earth, then, the TCs are grounded -- and very likely contaminated with ground loops. You will need to reference the TC inputs accordingly. These ground loops will cause the TC data readings to float - recall that TC readings are in the millivolt level. It does not take much of a ground loop to ruin a TC measurement.
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Measuring temperature and acceleration simultaneously

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