Calibration NI WSN 3212

Bonsoir,
J'utilise un module NI WSN 3212 avec une passerelle 9791 et je rencontre un problème de mesure de température.
Pas d'erreur LabVIEW de détectée mais la valeur mesurée est fausse, j'obtiens -273°C alors que la pièce est à 20°C !!!
J'utilise MAX 5.0, NI WSN 1.3 et LabVIEW 2009.
Comment corriger cette erreur de calibration ?
Merci d'avance.
Philippe B.
Certified Associate Developer / Dépt Moyens d'essais
www.ingenia-system.com

Hello binarystar105,
When you uploaded new firmware, did you follow the steps outlined in this article?
How Do I Upgrade the Firmware on My NI WSN Gateway?
http://digital.ni.com/public.nsf/allkb/CF6241F5F849FC7086257909008327C5?OpenDocument
Also, what firmware version do you currently have?
What version of the LabVIEW WSN Module are you working with?
If you look at the node properties from your LabVIEW Project Explorer window, can you set the sample interval from the node tab?
You may already be familiar with this material, but I found the following white paper to be extremely helpful when I started working with WSN:
Getting Started with NI Wireless Sensor Networks
http://www.ni.com/white-paper/8890/en/
Erin D.
Applications Engineer
National Instruments

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Hi, all.
I have a problem with temperature measurement using NI WSN 3212 node with external power supply. The value randomly changes for all four channels. It happens if at least one thermocouple connected to any channel. If I disconnect all thermocouples, the values of channels are NaN. I have not this problem when node powers by battery.

Hi,
1. Check for the correct power cord that you have attached with the node to give the external power.
2. Check for any external power supplied to the channels from your side.
3. Reboot the node and try to obtain the temperature from thermometer.

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My final year project is about programming the WSN nodes to communicate with eachother independently without the gateway. Can this be done using a Labview application ? Do you have some helpful examples ? I'm having difficulties with finding the required functions in Labview directories.
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hello,
thank you for your answer
the nodes I m working with are configured to communicate through the gateway. What I m supposed to do here, is to change the topology in purpose to send data from the first node directly to the second node which will send the received data to the gateway.
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When 3212 digital output to active a relay

plz help me about digital output of wsn 3212 .when temperature of thermocouple is abov then 25 degree i want to active a relay from digital output of node..plz tell me about this program...

sir suppose i want to measure temperature from thermocouple from wsn 3212node.nd compare it with 40.when temperature is above than 40 degree.it give an digital out put from wsn3212 to active an relay to run a fan..here is programming example is attached.assume here numeric value compare with incomming value from wsn 3212 thermocouple temperature.when temperature above than 40 then led on...
Attachments:
labview.png ‏192 KB
labview.png ‏192 KB

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Since I am new to labview and I want to interface wireless sensor module pioneer with pic Microcontroller using USB is it possible to do so??
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Hello Asper,
Thanks for the post!
I would be happy to post my code. See the attached LV 2010 project.
I used a serial SPI capable LCD screen from Crystalfontz to show locally what the temperature (using a thermocouple) and set point (using a potentiometer) are coming into the AI lines of the NI WSN-3212 node. Using just 2 digital lines, one for my SPI software timed clock and another for the data, I was able to update the screen with this information. I just pulled low the chip select line since the only thing I was communicating with was the LCD screen. I used the LabVIEW WSN Module to program LabVIEW directly on the WSN nodes. This is what allowed me to have control of the digital lines to make a CLK and DATA line.
Requirements for the project:
LabVIEW 2010 or later
LabVIEW 2010 WSN Module (for programming on the node)
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Best of luck to you on your projects!
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Attachments:
LCD SPI WSN Project (LV 2010).zip ‏3194 KB

Thermocouple Node Part Numbers - Difference between programmable and non-programmable nodes?

Hello!
We just received our starter kit and nodes. When looking at the part number on the back of the programmable thermocouple node (with the starter kit), it is listed as "197085D-01L". There is no number that matches the Part Number listed on the website, such as 780998-02. The non-programmable thermocouple nodes also have this same "197085D-01L" part number on the back. Is there another way to determine which of these nodes have LabVIEW capability?
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Solved!
Go to Solution.

Hello,
There is a $300 difference in the list price for the programmable and non-programmable nodes which is the ballpark figure for the license. I have included the links below for the product pages below, but our Sales team would be able to assist you with the actual price. Purchasing and sales contact information are also listed on the product pages as well.
NI WSN-3212 4 Ch, 24-Bit, Programmable Thermocouple Input Node
http://sine.ni.com/nips/cds/view/p/lang/en/nid/207089
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Hi,
What is the actual measuring speed of a NI sensor network sigle node? In NI WSN-3202, NI WSN-3212 and NI WSN-3226 datasheet there is Sample Rate 1 S/s, but in datasheet there is also Analog bandwidth 7 kHz? What does that analog bandwith mean or help if sampling rate is limited 1 S/s?
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You looking for this? How Fast Can I Sample on my WSN Nodes?
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Certified LabVIEW Architect
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WSN Channel Scan

Hello-
I am currently building an application using the following NI products:
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Please Help
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Hello obsessed,
This developer zone is in regards to WSN Dynamic Configuration and could be modified to read the WSN nodes NI Shared Variable engines I/O Variables dynamically.
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Can USRP be used as a Gateway for NI-WSN Nodes

Hi everyone,
I am using NI-WSN kIT comprises of gateway(9792) and NI-WSN NODES(3202,3212,3226 all programmable) and i am also trying experiments with NI-USRP 2921 so i thought to replace NI-9792 REAL TIME ETHERNET GATEWAY with NI-USRP 2921 as it is also operating on same 2.4GHz.
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Warm Regards,
Abhinav Sharma
Solved!
Go to Solution.

The short answer is No.
The longer answer is that a WSN node uses a fixed function radio with a full protocal stack. The USRP is a general purpose radio covering a common set of frequencies however a fully functional turnkey stack does not exist. Could it be designed? Perhaps over the course of many focused man-years of development.
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Mid 2010 15" i5 Battery Calibration Questions

Hi, I have a mid 2010 15" MacBook Pro 2.4GHz i5.
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Question 2: After reading Apple's calibration guide, I decided to set the MacBook Pro to never go to sleep (in Energy Saver System Preference) and leave it on overnight so it would run out of power and go to sleep, then I'd leave it in that state for at least 5 hours before charging it. When I woke up, the light on the front wasn't illuminated. It usually pulsates when in Sleep. Expectedly, it wouldn't wake when pressing buttons on the keyboard. So, what's happened? Is this Safe Sleep? I didn't see any "Your Mac is on reserve battery and will shut down" dialogues or anything similar, as I was asleep! I've left it in this state while I'm at work and will charge it this afternoon. Was my described method okay for calibration or should I have done something different?
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Message was edited by: Fresh J

Fresh J:
A1. You're fine calibrating the battery now. You might have gotten more accurate readings during the first month if you'd done it sooner, but no harm has been done.
A2. Your machine has NOT shut down; it has done exactly what it was supposed to do. When the power became critically low, it first wrote the contents of RAM to the hard drive, then went to sleep. When the battery was completely drained some time later, the MBP went into hibernation and the slepp light stopped pulsing and turned off. In that state the machine was using no power at all, but the contents of your RAM were still saved. Once the AC adapter was connected, a press of the power button would cause those contents to be reloaded, and the machine would pick up again exactly where you left off. It is not necessary to wait for the battery to be fully charged before using the machine on AC power, but do leave the AC adapter connected for at least two hours after the battery is fully charged. Nothing that you say you've done was wrong, and nothing that you say has happened was wrong.
A3. No, it does not matter.

USB 6009 - Calibration of Analog Input (Mac)

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Thank you in advance,
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I have LabView but I do not have the Calibration and Configuration Palette,and I could not download it, how can I download it or if i cannot,can I work with the NI-DAQ Calibration_1200?

I have read in a tutorial for the board 1200 that I can calibrate it with the Calibration and Configuration Palette in LabVIEW, but I do not have them and I could not download it to access its libraries, so I can only download the NI-DAQ software,What's my best choice and if it is to download the palette with its libraries, how can download it with them?I'd appreciate your answers

If you wish to use your 1200 device in LabVIEW, you must download and install NI-DAQ. When you install NI-DAQ, it will ask you if you would like to install support for LabVIEW. By installing this support, you will then have access to the DAQ pallette in LabVIEW. The DAQ pallette requires that you have NI-DAQ installed.
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PXI 2527 & PXI 4071 -Questions about EMF considerations for high accuracy measurements and EMF calibration schemes?

Hi!
I need to perform an in-depth analysis of the overall system accuracy for a proposed system. I'm well underway using the extensive documentation in the start-menu National Instruments\NI-DMM\ and ..\NI-Switch\ Documenation folders...
While typing the question, I think I partially answered myself while cross-referencing NI documents... However a couple of questions remain:
If I connect a DMM to a 2 by X arranged switch/mux, each DMM probe will see twice the listed internal "Differential thermal EMF" at a typical value of 2.5uV and a max value of less than 12uV (per relay). So the total effect on the DMM uncertainty caused by the switch EMF would be 2*2.5uV = 5uV? Or should these be added as RSS: = sqrt(2.5^2+2.5^2) since you can not know if the two relays have the same emf?
Is there anything that can be done to characterize or account for this EMF (software cal, etc?)?
For example, assuming the following:
* Instruments and standards are powered on for several hours to allow thermal stability inside of the rack and enclosures
* temperature in room outside of rack is constant
Is there a reliable way of measureing/zeroing the effect of system emf? Could this be done by applying a high quality, low emf short at the point where the DUT would normally be located, followed by a series of long-aperture voltage average measurements at the lowest DMM range, where the end result (say (+)8.9....uV) could be taken as a system calibration constant accurate to the spec's of the DMM?
What would the accuracy of the 4071 DMM be, can I calculate it as follows, using 8.9uV +-700.16nV using 90 days and 8.9uV +- 700.16nV + 150nV due to "Additional noise error" assuming integration time of 1 (aperture) for ease of reading the chart, and a multiplier of 15 for the 100mV range. (Is this equivalent to averaging a reading of 1 aperture 100 times?)
So, given the above assumptions, would it be correct to say that I could characterize the system EMF to within 8.5uV+- [700.16nV (DMM cal data) + 0.025ppm*15 (RMS noise, assuming aperture time of 100*100ms = 10s)] = +-[700.16nV+37.5nV] = +- 737.66nV? Or should the ppm accuracy uncertainties be RSS as such: 8.5uV +- sqrt[700.16nV^2 + 37.5nV^2] = 8.5uV +-701.16nV??
As evident by my above line of thought, I am not at all sure how to properly sum the uncertainties (I think you always do RSS for uncertainties from different sources?) and more importantly, how to read and use the graph/table in the NI 4071 Specifications.pdf on page 3. What exactly does it entail to have an integration time larger than 1? Should I adjust the aperture time or would it be more accurate to just leave aperture at default (100ms for current range) and just average multiple readings, say average 10 to get a 10x aperture equivalent?
The below text includes what was going to be the post until I think I answered myself. I left it in as it is relevant to the problem above and includes what I hope to be correct statements. If you are tired of reading now, just stop, if you are bored, feel free to comment on the below section as well.
The problem I have is one of fully understanding part of this documenation. In particular, since a relay consists of (at least) 2 dissimilar metal junctions (as mentioned in the NI Switch help\Fundamentals\General Switching Considerations\Thermal EMF and Offset Voltage section) and because of the thermo-couple effect (Seebeck voltage), it seems that there would be an offset voltage generated inside each of the relays at the point of the junction. It refeers the "Thermocouple Measurements" section (in the same help document) for further details, but this is where my confusion starts to creep up.
In equation (1) it gives the expression for determining E_EMF which for my application is what I care about, I think (see below for details on my application).
What confuses me is this: If my goal is to, as accurately as possible, determine the overall uncertainty in a system consisting of a DMM and a Switch module, do I use the "Differential thermal EMF" as found in the switch data-sheet, or do I need to try and estimate temperatures in the switch and use the equation?
*MY answer to my own question:
By carefully re-reading the example in the thermocouple section of the switch, I realized that they calculate 2 EMF's, one for the internal switch, calculated as 2.5uV (given in the spec sheet of the switch as the typical value) and one for the actual thermocouple. I say actual, because I think my initial confusion stems from the fact that the documenation talks about the relay/switch junctions as thermocouples in one section, and then talks about an external "probe" thermocouple in the next and I got them confused.
As such, if I can ensure low temperatures inside the switch at the location of the junctions (by adequate ventilation and powering down latching relays), I should be able to use 2.5uV as my EMF from the switch module, or to be conservative, <12uV max (from data sheet of 2527 again).
I guess now I have a hard time believeing the 2.5uV typical value listed.. They say the junctions in the relays are typically an iron-nickel alloy against a copper-alloy. Well, those combinations are not explicitly listed in the documenation table for Seebeck coefficients, but even a very small value, like 0.3uV/C adds up to 7.5uV at 25degC. I'm thinking maybe the table values in the NI documentation reffers to the Seebeck values at 25C?
Project Engineer
LabVIEW 2009
Run LabVIEW on WinXP and Vista system.
Used LabVIEW since May 2005
Certifications: CLD and CPI certified
Currently employed.

Seebeck EMV needs temperature gradients , in your relays you hopefully have low temperature gradients ... however in a switching contact you can have all kind diffusions and 'funny' effects, keeping them on same temperature is the best you can do.
Since you work with a multiplexer and with TCs, you need a good Cold junction ( for serious calibrations at 0°C ) and there is the good place for your short cut to measure the zero EMV. Another good test is loop the 'hot junction' back to the cold junction and observe the residual EMV. Touching (or heating/cooling) the TC loop gives another number for the uncertainty calculation: the inhomogeneous material of the TC itself..
A good source for TC knowledge:
Manual on the use of thermocouples in temperature measurement,
ASTM PCN: 28-012093-40,
ISBN 0-8031-1466-4
(Page1): 'Regardless
of how many facts are presented herein and regardless of the percentage
retained,
all will be for naught unless one simple important fact is
kept firmly in mind.
The thermocouple reports only what it "feels."
This may or may not the temperature of interest'
Message Edited by Henrik Volkers on 04-27-2009 09:36 AM
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'

Need to develop a calibration report

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Null offset from calibration not being applied to output

I am measuring some load cells using a I 9237. I am setting the null offset using Device > Bridge Calibration in the DAQ Assistant. I measure the offet and hit calibrate. It says "Calibration successful" and I hit finish, but the offset value is not applied to the data.
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