Resistance to temperature

Hi,
I need to accept the resistance and convert that to temperature in Labview. Cn some one give me the formula.
Actualy I need to get the temperature below 73K. But my RTD (FP-RTD-122) has data configuration as 73k - 1123k and not below 73k.
So i hv to do this is the labview program by accepting the resistance (0-400 ohms) and convert to temperature.
Thanks in advance.

To clarify, this topic is a duplicate to the one linked above.
Trey B
Applications Engineering
National Instruments

Similar Messages

"HP34970A Conf Resistance.vi" causes error message -113

I'm using Labview 6.1 to read voltage, frequency, resistance and temperature readings from an HP34970A (with 34902A 16-channel multiplexer).
Every time the "HP34970A Conf Resistance.vi" is completed it causes the HP34970A to display error -113: "Undefined header. A command was received that is not valid for this instrument. You may have misspelled the command or it may not be a valid command. If you are using the shortened form of this command, remember that it may contain up to four letters. Or you may have inserted an extra colon where one is not required.".
The only thing the vi is supposed to do, is to enable the offset compensation, which it is doing (I tested that with a separate program).
Although t
here is no help file with the NI drivers for the instrument and I'm new to Labview, I would like to know if someone found a workaround for this. It is kind of annoying because the error message is accompanied with a beep of the instrument every 3s.
Thanks.

Thanks for your fast response.
I'm using the latest version of the drivers (I installed everything in the begining of Mai).
I wrote a small vi for NI Spy, just a simple 4 wire resistor measurement with "Conf Resistance.vi" at the beginning.
Unfortunately it is my first time working with LabVIEW and the VISA language, and the syntax looks correct for me. ( But I still get the -113 error.)
Here the processed commands (1 loop):
1. viGetAttribute (0x0015B920,0x3FFF018F,VI_FALSE)
Process ID: 0x0000033C Thread ID: 0x0000041C
Start Time: 14:52:09.127 Call Duration: 00:00:00.000
Status: 0 (VI_SUCCESS)
2. viGetAttribute (0x0015B920,0x3FFF018F,VI_FALSE)
Process ID: 0x0000033C Thread ID: 0x0000041C
Start Time: 14:52:09.127 Call Duration: 00:00:00.010
Status: 0 (VI_SUCCESS)
3. viGetAttribute (0x0015B920,0x3FFF018F,VI_FALSE)
Process ID: 0x0000033C Thread ID: 0x0000041C
Start Time: 14:52:09.157 Call Duration: 00:00:00.000
Status: 0 (VI_SUCCESS)
4. viGetAttribute (0x0015B920,0x3FFF018F,VI_FALSE)
Process ID: 0x0000033C Thread ID: 0x0000041C
Start Time: 14:52:09.157 Call Duration: 00:00:00.000
Status: 0 (VI_SUCCESS)
5. viOpen (0x0015B920,"COM1",0 (0x0),0 (0x0),0x0017CC30)
Process ID: 0x0000033C Thread ID: 0x0000042C
Start Time: 14:52:17.469 Call Duration: 00:00:00.010
Status: 0 (VI_SUCCESS)
6. viGetAttribute (0x0017CC30,0x3FFF0171,4 (0x4))
Process ID: 0x0000033C Thread ID: 0x0000042C
Start Time: 14:52:17.479 Call Duration: 00:00:00.000
Status: 0 (VI_SUCCESS)
7. viGetAttribute (0x0017CC30,0x3FFF0171,4 (0x4))
Process ID: 0x0000033C Thread ID: 0x0000042C
Start Time: 14:52:17.479 Call Duration: 00:00:00.000
Status: 0 (VI_SUCCESS)
8. viSetAttribute (0x0017CC30,0x3FFF001A,10000 (0x2710))
Process ID: 0x0000033C Thread ID: 0x0000042C
Start Time: 14:52:17.479 Call Duration: 00:00:00.000
Status: 0 (VI_SUCCESS)
9. viSetAttribute (0x0017CC30,0x3FFF0021,57600 (0xE100))
Process ID: 0x0000033C Thread ID: 0x0000042C
Start Time: 14:52:17.479 Call Duration: 00:00:00.010
Status: 0 (VI_SUCCESS)
10. viSetAttribute (0x0017CC30,0x3FFF0025,1 (0x1))
Process ID: 0x0000033C Thread ID: 0x0000042C
Start Time: 14:52:17.489 Call Duration: 00:00:00.000
Status: 0 (VI_SUCCESS)
11. viWrite (0x0017CC30,"*RST.",5 (0x5),5 (0x5))
Process ID: 0x0000033C Thread ID: 0x0000042C
Start Time: 14:52:17.489 Call Duration: 00:00:00.000
Status: 0 (VI_SUCCESS)
12. viWrite (0x0017CC30,"SYSTRES.",10 (0xA),10 (0xA))
Process ID: 0x0000033C Thread ID: 0x0000042C
Start Time: 14:52:17.489 Call Duration: 00:00:00.000
Status: 0 (VI_SUCCESS)
13. viWrite (0x0017CC30,"*IDN?.",6 (0x6),6 (0x6))
Process ID: 0x0000033C Thread ID: 0x0000042C
Start Time: 14:52:17.489 Call Duration: 00:00:00.000
Status: 0 (VI_SUCCESS)
14. viRead (0x0017CC30,"HEWLETT-PACKARD,34970...",50 (0x32),32 (0x20))
Process ID: 0x0000033C Thread ID: 0x0000042C
Start Time: 14:52:17.489 Call Duration: 00:00:00.370
Status: 0 (VI_SUCCESS)
15. viWrite (0x0017CC30,"*RST.",5 (0x5),5 (0x5))
Process ID: 0x0000033C Thread ID: 0x0000042C
Start Time: 14:52:17.859 Call Duration: 00:00:00.000
Status: 0 (VI_SUCCESS)
16. viWrite (0x0017CC30,"SYSTRES.",10 (0xA),10 (0xA))
Process ID: 0x0000033C Thread ID: 0x0000042C
Start Time: 14:52:17.859 Call Duration: 00:00:00.000
Status: 0 (VI_SUCCESS)
17. viWrite (0x0017CC30,"FUNC "RES", (@);EN...",122 (0x7A),122 (0x7A))
Process ID: 0x0000033C Thread ID: 0x0000042C
Start Time: 14:52:18.781 Call Duration: 00:00:00.020
Status: 0 (VI_SUCCESS)
18. viWrite (0x0017CC30,"MEAS:FRES? AUTO, (@101).",24 (0x18),24 (0x18))
Process ID: 0x0000033C Thread ID: 0x0000042C
Start Time: 14:52:19.742 Call Duration: 00:00:00.010
Status: 0 (VI_SUCCESS)
19. viSetAttribute (0x0017CC30,0x3FFF001A,320000 (0x4E200))
Process ID: 0x0000033C Thread ID: 0x0000042C
Start Time: 14:52:19.752 Call Duration: 00:00:00.000
Status: 0 (VI_SUCCESS)
20. viRead (0x0017CC30,"+1.08185990E+02..",500 (0x1F4),17 (0x11))
Process ID: 0x0000033C Thread ID: 0x0000042C
Start Time: 14:52:19.752 Call Duration: 00:00:00.130
Status: 0 (VI_SUCCESS)
21. viClose (0x0017CC30)
Process ID: 0x0000033C Thread ID: 0x0000042C
Start Time: 14:52:21.214 Call Duration: 00:00:00.000
Status: 0 (VI_SUCCESS)
Thanks,
Dirk

Indexing a set of data to take an average

hi,
I am measuring the resistance vs temperature. For this, 10 times resistance are measured and average of this data is plotted vs temperature which is also averaged.
I couldn't do that unfortunately. How can I do that?
thanks
Attachments:
Capture.JPG ‏98 KB

I have attached vi '. There are 2 cycle to check. But I need 10.
Best.
Attachments:
Read Condition_SC_sub.vi ‏74 KB
Stability_control - 5K.vi ‏28 KB
Stability_control.vi ‏30 KB

Writing data to excel in multiple columns

Hi,
I have 9 arrays of values that I concatenate into one array, which I
then send through a formula node. I split the resulting array back into
9 arrays, which I would like to write to a spreadsheet file, such that
each array is one column. I also have a "time" column which I want
write as the first column, followed by the 9 columns (the arrays that
went through the formula node).
Right now all I get is one long column.
Any suggestions?
Attachments:
resistance to temperature.vi ‏109 KB

You need to wire each of your data arrays (PT100 1 through 9) as separate inputs into a Build Array function, with the Time array as the first input, for a total of 10 inputs. Make sure the "Concatenate Inputs" option on the Build Array is not selected. Then wire the resulting 2D array to the "2D data" input of the Write to Spreadsheet File.vi. This should give you the data in the format you need.
You can learn more about constructing arrays by reading the LabVIEW Help on the Build Array function.
Good luck,
-D
Darren Nattinger, CLA
LabVIEW Artisan and Nugget Penman

Thermal Flowmeter question?

I am currently building a thermal Flowmeter for a college project and i have hit a brick wall. My problem is that i have an output voltage coming from my flowmeter which is basically a wheatstone bridge with a thermistor. The temperature is kept at a current temperature and any flow will change the temperature and this is what i will measure. When the temperature changes there is a change in voltage and i have this voltage being fed into labview and being displayed. This voltage is related to the flow of the system and i was wondering is there some Labview program or VI available that will help in this conversion.
Please and thanks.
Regards Mgarvey

It looks as though you have two conversions. The thermistor is a transducer which changes its resistance (non-linearly) with temperature. The bridge is a signal conditioner which converts that resistance to a voltage. Then your data acquisition system converts the voltage into a number.
What I think you are asking is for the further conversion of that number (representing volts, and indirectly resistance and temperature) to another number representing flow. I doubt you will find a LV program sitting around to do what you want because there are too many variables and complex relationships among them to do the conversion in any sort of universal manner. Things like the package style of the thermistor, whether the flow is laminar or turbulent, etc., play a role.
The thermistor data sheet should give some data about the thermal transfer rates at various flow rates. If it does not, you will need to make a series of calibration runs. Any system of this type will need to be calibrated after assembly because too many unknowns exist to design them all out.
Lynn

Qosmio F30-117 - Display issues - red and green lines

Hi there,
I have a qosmio F30-117 and up to recently, I was delighted with everything about it.
Then, mid session, the graphics began to deteriorate, which a reboot fixed.
Then a few days later, it did it again and this time when I rebooted it came up with a corrupted display, lots of aa's all over the place then lines of red and green all over.
Managed to get in by selecting safe mode with networking and got a desktop although still with the red and green lines all over it.
Now its gotten worse still, when I boot up the laptop screen itself is blank, its getting something because it isnt totally black like it is when its powered off, but its blank.
As a check I connected an external monitor and managed to get in again to safe mode with networking, but its still very bad, and still has the red and green lines all over.
I started to have a look around on the good old www and there are numerous posters and articles with problems, and lots mentioning the red and green lines etc...
so Im not alone, but no-one seems to know exactly what it is.
Some have mentioned Toshiba acknowledging this as a problem and doing repairs even if out of warranty.
So, any ideas, any advice, and does anyone know if Tosh have indeed accepted the problem and offering any help??
Thanks in advance

Hi
I think it's a common problem in the Qosmio F30 models. After long term use, the soldering balls under the GPU chipset start to melt down because of the over heat and the bad soldering quality that was used with the F30 model that cannot resist high temperature. Now you have to replace the motherboard, since the GPU is build within the motherboard.
However, there is another two solution for this problem and cost less money amount:
1- do what is called a "heat reflow" for the VGA chipset: to do this you have to take the motherboard out and heat the VGA chipset on the motherboard with a heat gun or you can bake it in the oven for a few minutes at low temp, this will make the soldering balls melt and go back to there right position. However, you need to keep in mind that this solution is temporary and will last maybe for month then you have to do it again and again till you ruin the GPU and then the only solution will be to buy another motherboard. So I don't recommend that you do that at all, but if you don't want to spend a lot of money on a new motherboard this will help you to recover your data, even though there is more easier solution to do the recovery.
Anyways, you can go to youtube and search the term "VGA heat reflow " to see how people do it.
2- send your motherboard to a repairing service that can do what is called reballing: what they do is that they will replace the soldering balls under the VGA chipset with new ones that can resist high temp. and this solution is permanent and even in the future you don't have to worry that the same problem will happen again since the new soldering balls can take high temp change. I do recommend this solution even more than buying a motherboard, since the motherboard that you will get will generate the same problem after few years.
you can find this type of repair service online if you googled the term "VGA reball repair" or you can find it on ebay
If you decided to replace the motherboard I think you will not be able to find a new one, and in case you found one it will be more expensive than a new laptop, but still you can find used motherboard for your qosmio on ebay or online. so you need to do a search and find out what fits your budget or maybe it's better to buy a new laptop.
Sorry about your qosmio, and hope that my post will help you!

Ni 9218 and temperature or resistance measurement

I'm looking for advise on ways that the NI 9218 could be used to measure resistance from an RTD that will operate in the 100 to 140 Ohm range. I understand that a channel of the 9218 can be configured to measure current (+/- 20 mA). So I would think that it might be possible to setup a configuration to measure the resistance indirectly by converting the measured current to resistance using V=IR. Is this reasonable and possible?

Thanks for your help and the link. I'm thinking of using an Omega RTD possibly a SA1-RTD
http://www.omega.com/pptst/SA1-RTD.html
But I could work with a different RTD if need be. The SA1-RTD gives 100 ohms at 32 degrees F which would be the lowest temperature (and resistance) that I would need to measure. Maybe I could put a fixed resistor in series with the RTD and get the resistance level a bit higher and use less current.
I'm trying to avoid the addtion of another module to the system that Im working with and I do have a single channel available for a temperature measuement on the 9218.

Resistance convert to temperature

Hi
i'm a beginner in labview. and im suppose to create thermometer using labview.
the problem im having is that the temperature isnt stable and data is incorrect. im just wondering is the formula issue or the settings for the daq.
please help.
thanks alot.
Attachments:
myDAQ_Digital Thermometer.zip ‏143 KB

Help>Find Examples>Hardware Input and Output>Instrument Drivers>LabVIEW Plug and Play.
The 34401 driver is on the Instrument I/O palette. The instrument does the conversion for you so I don't understand the question.
Oops - Just noticed the note that said the example applies only to the 34410/34411. Sorry. I don't have the manual handy.

Is Iphone 6 water resistant or proof?

Is the Iphone 6 water resistant or proof? I can't find any information about this at the website and I am curious to know either way.

Well, then you are only repeating what is being discussed rather than providing information based on specifications that you have actually seen. Here are the specifications for the iPhone 6 provided by Apple. I see something about humidity in the Environmental Requirements, but do not see anything specifically referring to "water resistance". So, no - it is not specified by the Apple Spec Sheets. Best not to attack people who are providing actual links to the place where the real Apple specs are, because you read something different on the internet....
GB
iPhone 6
iPhone 6 Plus
Finish
iPhone 6
Silver, Gold, Space Gray
iPhone 6 Plus
Silver, Gold, Space Gray
Capacity and Price1
iPhone 6
16GB
$199
64GB
$299
128GB
$399
iPhone 6 Plus
16GB
$299
64GB
$399
128GB
$499
Weight and Dimensions2
iPhone 6
Height: 5.44 inches (138.1 mm)
Width: 2.64 inches (67.0 mm)
Depth: 0.27 inch (6.9 mm)
Weight: 4.55 ounces (129 grams)
iPhone 6 Plus
Height: 6.22 inches (158.1 mm)
Width: 3.06 inches (77.8 mm)
Depth: 0.28 inch (7.1 mm)
Weight: 6.07 ounces (172 grams)
Display
iPhone 6
Retina HD display
4.7-inch (diagonal) LED-backlit widescreen Multi-Touch display with IPS technology
1334-by-750-pixel resolution at 326 ppi
1400:1 contrast ratio (typical)
500 cd/m2 max brightness (typical)
Full sRGB standard
Dual-domain pixels for wider viewing angles
Fingerprint-resistant oleophobic coating on front
Support for display of multiple languages and characters simultaneously
Display Zoom
Reachability
iPhone 6 Plus
Retina HD display
5.5-inch (diagonal) LED-backlit widescreen Multi-Touch display with IPS technology
1920-by-1080-pixel resolution at 401 ppi
1300:1 contrast ratio (typical)
500 cd/m2 max brightness (typical)
Full sRGB standard
Dual-domain pixels for wider viewing angles
Fingerprint-resistant oleophobic coating on front
Support for display of multiple languages and characters simultaneously
Display Zoom
Reachability
Chips
A8 chip with 64-bit architecture
M8 motion coprocessor
iSight Camera
New 8-megapixel iSight camera with 1.5µ pixels
Autofocus with Focus Pixels
ƒ/2.2 aperture
Optical image stabilization (iPhone 6 Plus only)
True Tone flash
Five-element lens
Hybrid IR filter
Backside illumination sensor
Sapphire crystal lens cover
Auto image stabilization
Auto HDR for photos
Improved face detection
Exposure control
Panorama (up to 43 megapixels)
Burst mode
Tap to focus
Photo geotagging
Timer mode
Video Recording
1080p HD video recording (30 fps or 60 fps)
True Tone flash
Slo-mo video (120 fps or 240 fps)
Time-lapse video
Cinematic video stabilization
Continuous autofocus video
Take still photos while recording video
Improved face detection
3x zoom
Video geotagging
FaceTime Camera
1.2-megapixel photos (1280 by 960)
ƒ/2.2 aperture
720p HD video recording
Backside illumination sensor
Auto HDR for photos and videos
Improved face detection
Burst mode
Exposure control
Touch ID
Fingerprint identity sensor built into the Home button
Apple Pay
Pay with your iPhone using Touch ID in stores and in apps
Learn more about Apple Pay
Cellular and Wireless
Model A1549 (GSM)*
Model A1522 (GSM)*
UMTS/HSPA+/DC-HSDPA (850, 900, 1700/2100, 1900, 2100 MHz)
GSM/EDGE (850, 900, 1800, 1900 MHz)
LTE (Bands 1, 2, 3, 4, 5, 7, 8, 13, 17, 18, 19, 20, 25, 26, 28, 29)
Model A1549 (CDMA)*
Model A1522 (CDMA)*
CDMA EV-DO Rev. A and Rev. B (800, 1700/2100, 1900, 2100 MHz)
UMTS/HSPA+/DC-HSDPA (850, 900, 1700/2100, 1900, 2100 MHz)
GSM/EDGE (850, 900, 1800, 1900 MHz)
LTE (Bands 1, 2, 3, 4, 5, 7, 8, 13, 17, 18, 19, 20, 25, 26, 28, 29)
Model A1586*
Model A1524*
CDMA EV-DO Rev. A and Rev. B (800, 1700/2100, 1900, 2100 MHz)
UMTS/HSPA+/DC-HSDPA (850, 900, 1700/2100, 1900, 2100 MHz)
TD-SCDMA 1900 (F), 2000 (A)
GSM/EDGE (850, 900, 1800, 1900 MHz)
FDD-LTE (Bands 1, 2, 3, 4, 5, 7, 8, 13, 17, 18, 19, 20, 25, 26, 28, 29)
TD-LTE (Bands 38, 39, 40, 41)
All models
802.11a/b/g/n/ac Wi‑Fi
Bluetooth 4.0 wireless technology
NFC
Location
Assisted GPS and GLONASS
Digital compass
Wi‑Fi
Cellular
iBeacon microlocation
Video Calling3
FaceTime video
Initiate video calls over Wi‑Fi or cellular to any FaceTime-enabled device
FaceTime over cellular uses H.264/H.265
Audio Calling3
FaceTime audio
iPhone 6 to any FaceTime audio-enabled device over Wi‑Fi or cellular
Voice over LTE (VoLTE)4
Wi-Fi calling4
Audio Playback
Audio formats supported: AAC (8 to 320 Kbps), Protected AAC (from iTunes Store), HE-AAC, MP3 (8 to 320 Kbps), MP3 VBR, Audible (formats 2, 3, 4, Audible Enhanced Audio, AAX, and AAX+), Apple Lossless, AIFF, and WAV
User-configurable maximum volume limit
TV and Video
AirPlay Mirroring, photos, audio, and video out (2nd generation or later)
Video mirroring and video out support: Up to 1080p through Lightning Digital AV Adapter and Lightning to VGA Adapter (adapters sold separately)
Video formats supported: H.264 video up to 1080p, 60 frames per second, High Profile level 4.2 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; MPEG-4 video up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps per channel, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; Motion JPEG (M-JPEG) up to 35 Mbps, 1280 by 720 pixels, 30 frames per second, audio in ulaw, PCM stereo audio in .avi file format
Intelligent Assistant5
Siri — Use your voice to send messages, set reminders, and more
Use hands-free
Listen and identify songs
External Buttons and Connectors
On/Off, Sleep/Wake
Ring/Silent
Volume up/down
Home/Touch ID sensor
3.5-mm stereo headphone minijack
Microphone
Lightning connector
Built-in speaker
Power and Battery6
Built-in rechargeable lithium-ion battery
Charging via USB to computer system or power adapter
Talk time: Up to 14 hours on 3G
Standby time: Up to 10 days (250 hours)
Internet use: Up to 10 hours on 3G browse, up to 10 hours on LTE, up to 11 hours on Wi-Fi
Video playback: Up to 11 hours
Audio playback: Up to 50 hours
Built-in rechargeable lithium-ion battery
Charging via USB to computer system or power adapter
Talk time: Up to 24 hours on 3G
Standby time: Up to 16 days (384 hours)
Internet use: Up to 12 hours on 3G browse, up to 12 hours on LTE, up to 12 hours on Wi-Fi
Video playback: Up to 14 hours
Audio playback: Up to 80 hours
Sensors
Touch ID
Barometer
Three-axis gyro
Accelerometer
Proximity sensor
Ambient light sensor
Operating System
iOS 8
With amazing new capabilities and updates to features you use every day, iOS 8 is the biggest iOS release ever.
iOS 8 includes:
AirDrop
AirPlay
CarPlay
Control Center
Family Sharing
iCloud Drive
iTunes Radio
Multitasking
Notification Center
QuickType keyboard
Siri
Spotlight Search
Built-in Apps
Camera
Photos
Health
Messages
Phone
FaceTime
Mail
Music
Passbook
Safari
Maps
Siri
Calendar
iTunes Store
App Store
Notes
Contacts
iBooks
Game Center
Weather
Reminders
Voice Memos
Clock
Videos
Stocks
Calculator
Newsstand
Compass
Podcasts
Free Apps from Apple7
iMovie
Pages
Keynote
Numbers
iTunes U
GarageBand
Apple Store
Trailers
Remote
Find My iPhone
Find My Friends
Headphones
Apple EarPods with Remote and Mic
Storage and travel case
SIM card
Nano-SIM
iPhone 6 is not compatible with existing micro‑SIM cards
Connector
Lightning
Rating for Hearing Aids
iPhone 6iPhone 6 (Model A1549, A1586): M3, T4
iPhone 6 Plus
iPhone 6 Plus (Model A1522, A1524): M3, T4
Mail Attachment Support
Viewable document types.jpg, .tiff, .gif (images); .doc and .docx (Microsoft Word); .htm and .html (web pages); .key (Keynote); .numbers (Numbers); .pages (Pages); .pdf (Preview and Adobe Acrobat); .ppt and .pptx (Microsoft PowerPoint); .txt (text); .rtf (rich text format); .vcf (contact information); .xls and .xlsx (Microsoft Excel); .zip; .ics
System Requirements
Apple ID (required for some features)
Internet access8
Syncing with iTunes on a Mac or PC requires:
Mac: OS X v10.6.8 or later
PC: Windows 8; Windows 7; Windows Vista; or Windows XP Home or Professional with Service Pack 3 or later
iTunes 11.4 or later (free download from www.apple.com/itunes/download)
Environmental Requirements
Operating ambient temperature: 32° to 95° F (0° to 35° C)
Nonoperating temperature: -4° to 113° F (-20° to 45° C)
Relative humidity: 5% to 95% noncondensing
Operating altitude: tested up to 10,000 feet (3000 m)
Languages
Language supportEnglish (Australia, Canada, UK, U.S.), Chinese (Simplified, Traditional, Traditional Hong Kong), French (Canada, France), German, Italian, Japanese, Korean, Spanish (Mexico, Spain), Arabic, Catalan, Croatian, Czech, Danish, Dutch, Finnish, Greek, Hebrew, Hindi, Hungarian, Indonesian, Malay, Norwegian, Polish, Portuguese (Brazil, Portugal), Romanian, Russian, Slovak, Swedish, Thai, Turkish, Ukrainian, Vietnamese
QuickType keyboard support
English (Australia, Canada, India, UK, U.S.), Chinese - Simplified (Handwriting, Pinyin, Stroke), Chinese - Traditional (Cangjie, Handwriting, Pinyin, Stroke, Sucheng, Zhuyin), French (Canada, France, Switzerland), German (Germany, Switzerland), Italian, Japanese (Kana, Romaji), Korean, Spanish, Arabic, Bengali, Bulgarian, Catalan, Cherokee, Croatian, Czech, Danish, Dutch, Emoji, Estonian, Filipino, Finnish, Flemish, Greek, Hawaiian, Hebrew, Hindi, Hungarian, Icelandic, Indonesian, Latvian, Lithuanian, Macedonian, Malay, Marathi, Norwegian, Polish, Portuguese (Brazil, Portugal), Romanian, Russian, Serbian (Cyrillic, Latin), Slovak, Slovenian, Swedish, Tamil, Thai, Turkish, Ukrainian, Urdu, Vietnamese
QuickType keyboard support with predictive input9
English (Australia, Canada, India, UK, U.S.), Chinese (Simplified, Traditional), French (Canada, France, Switzerland), German (Germany, Switzerland), Italian, Japanese, Spanish, Portuguese (Brazil), Thai
Siri languages
English (Australia, Canada, UK, U.S.), Spanish (Mexico, Spain, U.S.), French (Canada, France, Switzerland), German (Germany, Switzerland), Italian (Italy, Switzerland), Japanese, Korean, Cantonese (Hong Kong)
Dictation languages
English (Australia, Canada, UK, U.S.), Spanish (Mexico, Spain, U.S.), French (Canada, France, Switzerland), German (Germany, Switzerland), Italian (Italy, Switzerland), Japanese, Korean, Mandarin (Mainland China, Taiwan), Cantonese (Hong Kong), Catalan, Croatian, Czech, Danish, Dutch, Finnish, Greek, Hungarian, Indonesian, Malaysian, Norwegian, Polish, Portuguese (Brazil, Portugal), Romanian, Russian, Slovakian, Swedish, Turkish, Thai, Ukrainian, Vietnamese
Definition dictionary support
English, Chinese (Simplified), French, German, Italian, Japanese, Korean, Spanish, Dutch, Portuguese (Brazil), Russian, Thai, Turkish
Bilingual dictionary support
Simplified Chinese, Japanese, Korean, Spanish
Spell check
English (Australia, Canada, UK, U.S.), French, German, Italian, Spanish, Danish, Dutch, Polish, Portuguese (Brazil, Portugal), Russian, Swedish, Turkish
In the Box
iPhone with iOS 8
Apple EarPods with Remote and Mic
Lightning to USB Cable
USB Power Adapter
Documentation
iPhone and the Environment
Mercury-free LED-backlit display
Arsenic-free display glass
Brominated flame retardant-free
PVC-free
Recyclable aluminum enclosure
Power adapter outperforms strictest global energy efficiency standards
Speaker enclosure with 30 percent post-consumer recycled plastic

NI 9237 with varriable resistance

Dear All,
I am interfacing NI 9237 module with a vaiiable resistance to just give a demo how to read analoge sensor ,
I am not able to get the values of my varriabe resistance(POT)
I just want to display the variation in a numeric text box as i change the value of POT
I vave made the following connection
VOUT of POT-----------> AI+
EX+--------------------------->5v
EX- --------------------------> GND
I ave not connecteda any other pin of 9237 can you please send me pin connections how do I connect 9237 signals with POT to just see value on text box
I am using scan Interface and using AI3 channel to see the result
rupesh
Attachments:
block.png ‏53 KB
block2.png ‏49 KB

This is a transmitter. That means: it is only an electronic module to generate a current of 4-20 mA from a resistance temperature sensor PT100. You cannot connect this to a NI9217, it needs a Pt100 temperature sensor, they usually come together.
What is your temperature sensor connected to this? Please provide information about it so I can help more precisely. Read the manual, that should have a Input PT100 as shown in the first page: http://www.status.co.uk/files/manual/37.pdf
Then you have 2 options:
1) If you have already a NI 9217 module, you can connect your PT100 temperature sensor directly without using a transmitter. That means: Remove the transmitter, simply connect red cable (1) to RTD+, white cable (2) to RTD- and the second white cable (3) to COM. Use the sample NI 9217 program provided in the samples folder of NI.
2) If you want to use a PT100 sensor + this transmitter, you need a current input module such as NI 9208. There you will read a current of 4-20 mA and convert this to a temperature reading. Again use the sample NI 9208 program provided in the samples folder of NI.
I hope this will help.

RTD Temperature Measurements using LabView 2013 and MyRio

Hey everyone. I am VERY new to LabView programming and working with a MyRio. I need to figure out how to measure the resistance of a 2 wire RTD to find a temperature utalizing the MyRio and LabView. I am pretty lost on how to do this. Does anyone know some good resources for making the LabView program off of the tops of their heads? I've figured out how to measure from specific pins, but I am not sure how to get it to constantly output a voltage from the output pins.
Eventually, I would like to have it display the temperature as well as have it turn on or off a heater depending on that temperature, but that will come far later in this process. First things first, how do I take temperature measurements utalizing LabView 2013 and a MyRio with a 2 Wire RTD.
Thanks so much!

Hi JoshEpstein87,
The myRIO can't acquire a change in resistance directly, so you'll need to somehow convert the change in resistance to a change in voltage. There are multiple ways to do this, but you'll need to build an external circuit and then read the voltage output with the myRIO. One example of a circuit that allows you to do this can be found here. To output a voltage on the analog output pins, you should just need to set the output voltage and then it will remain at that voltage until you change it or power cycle the myRIO.
To get started with LabVIEW and myRIO programming, see the following page:
http://www.ni.com/myrio/setup/getting-started/
There are some links to LabVIEW training as well as resources about RIO programming. I also highly recommend you check out the myRIO Community as there are example programs on there that you can take a look at to see how they are designed.
Best Regards,
Matthew B.
Applications Engineer
National Instruments

I have a SC-2042-RTD Board and the temperature reading I get are approxiximately 7 degrees high. Every thing is connected as specified in the manual. We are using a 3 wire RTD configuratuion.

I have a SC-2042-RTD Board and the temperature readings I get are approxiximately 7 degrees high. Every thing is connected as specified in the manual. We are using a 3 wire RTD configuratuion. The current excitation is set at 1mA but is actually 1.0035 mA from the board. The Daq card I am using is a DaqCard-A
I16XE-50.

Two quick things to check are: make sure the sensor does not exceed a max resistance of 8.5k ohms and do not leave any current excitation sources unloaded.
Also, check out chapter five of the SC-2042 user manaul (attached) about how to calibrate the device. This may help get rid of the bad readings.
Brian
Attachments:
SC-2042.pdf ‏166 KB

Can SCC-RTD01 be used with Cernox RTD's, silicon diode temperature sensors?

Hi,
Can the SCC-RTD01 be used with negative temperature
coefficient RTD's such as the Cernox RTD's. Can it be used with
silicon diode temperature sensors?
I was planning on using the SCC-RTD01 with platinum
resistance wires, but want a screw mount type sensor. Couldn't
find any platinum RTD devices with screw mounts, but could find the
Cernox and diode temperature sensors with the screw mounts.
Thanks,
Mark

Mark,
Thank you for contacting National Instruments! When you configure an RTD channel in the Measurement and Automation Explorer (MAX), you have the option of choosing from a list of "standard" RTD's or entering your own polynomial expression as the temperature coefficients. Therefore, negative coefficients shouldn't pose a problem. Also, I don't see any reason why a silicon diode temperature sensor would pose a problem either.
I hope this information is helpful to you!
Jeff P.
National Instruments Applications Engineer
Jeffrey P.
LabVIEW Product Management
National Instruments

How to account for and set the temperature in testing

The problem is this: I'm setting up an airflow resistance test and I need to account for temperature and barometric pressure. However, I don't know how to setup LabVIEW to account for these variables.

Devont:
Actually this issue is a fairly complex problem in aerodynamics. I am
an aerospace engineer who has developed computer code for this very
purpose in a couple of wind tunnels. When you say you are setting up
an airflow "resistance" test, what physical (aerodynamic) properties
are you trying to measure? Tunnel flow velocity? Mass flow?
Aerodynamic properties on a test model? (lift and drag coefficients,
center of pressure, gross forces?)
If you are trying to measure air flow velocity through a wind tunnel
test section, then the next question is what type of sensor system are
you using to do this? A pitot-static probe? A hot wire anenometer?,
an LDV (doppler laser)? Each has different techniques for getting
back flow properties.
Also what kind of tunnel is this? Low speed subsonic (say less <100
M/s) Mid speed subsonic <0.6 Mach? Transonic 0.8 to 1.2 Mach?
Supersonic 1.2 to 4.0 Mach? Hypersonic (say >4.0 Mach?) This will
make a great deal of difference in computing flow properties.
Mach number is a ratio of the flow velocity to the local speed of
sound where;
M=v/a where a is the speed of sound.
a=(gamma*r*t)^0.5
where gamma is the ratio of specific heats Cp/Cv, r is the gas
constant, and t is the absolute temperature. Gamma is a constant up to
about mach 4 but really starts to fall apart after that so this speed
of sound equation becomes a lot less useful for hypersonic analysis.
At low speeds gamma for air is approximately 1.4, r is about 287 for
air. At STP, the speed of sound is about 340 meters/second.
What is the scale of your tunnel? What is the density altitude of
your tunnel? What is the fluid medium in your tunnel? (Is it regular
air or something else?) These play into computing flow properties
because they affect a dimensionless flow property called the Reynolds
number which affects how the flow in the tunnel behaves.
You will need to consider also humidity which affects the density of
the fluid medium in your tunnel. Water vapor has a molecular weight
of 18. Dry air (0% RH) has a molecular weight of about 28.9. The
more water vapor you have, the lighter the sample volume of "air" will
be. The ability of air to retain water vapor is a function of
temperature, so a relative humidity of 100% at 0 degrees C will
contain much less water vapor than a relative humidity of 20% at 30
degrees C.
Because of something called the "boundary layer" the velocity profile
will be faster in the center of your tunnel than at the walls. It
will resemble something like a U shape for higher Reynolds numbers and
for very low Reynolds numbers may look more like a parabola. Reynolds
number is computed by:
Re=rho*V*L/mu
where rho is the air density, V is the flow velocity, and mu is a
property called the kinematic viscosity which is a function of
temperature.
The Reynolds number, like the Mach number, the Nusselt number, and a
few other fluid dynamics properties is a dimensionless ratio. Flows
with a similar dimensionless property should behave more or less the
same. This is called similitude.
Mass flow calculations first require that you know the air speed
profile of your tunnel and then you will need to compute the density
of the air in the tunnel and then perform an integration process to
calculate the actual mass flow through a particular plane of interest
in the tunnel.
Also, even when you put a test probe into the tunnel to measure the
flow in the tunnel, this will interfere with the free flow to a
certain of the tunnel. To minimize this, the test probes have to be
carefully designed and their size needs to be much smaller than the
overall tunnel dimensions. Later when you put a test model in the
tunnel, it and it's mounting system will also have an interference
effect on the tunnel that has to be accounted for.
To give a simple (perhaps an overly simple) answer to your question,
temperature and barometric pressure will play into your problems of
computing forces in that they affect the density of the fluid medium
in your tunnel via the unified gas law (which is a combined expression
of Charles and Boyles laws for perfect gases):
PV=nRT
or
Pv=rT
where rho, the density is the inverse of v, so this is sometimes
written as:
P/rho=rT
This only applies for perfect gases though. A perfect gas is one
where the constant pressure and constant volume specific heats (Cv,
and Cp) are fixed. The hotter and more dense the fluid medium, the
less true these equations become.
Temperature in these equations doesn't mean the common ways that we
ordinarily talk about temperature when cooking or talking about the
weather. Instead of C or F, temperature in the gas law must be on an
absolute scale such as Kelvin or Rankin. 0 degrees Kelvin or
Rankine=-273.15 degrees C or -459.67 degrees F. One Kelvin degree=1.8
Rankine degrees but both start at the same point of absolute zero.
For standard atmospheric conditions (called STP for standard
temperature and pressure), 1 cubic meter of air weighs about 1.226 kg.
You have to calculate the density of air at non standard conditions
by solving algebraically for the above gas law equation.
r is called the gas constant and can be derived from the universal gas
constant R (8314 units I can't remember of the top of my head but it
involves kJ/kg.mole or something like) by deviding by the molecular
weight of the gas in question. If the gas is a mixture then you will
have to apply the partial pressures rule to come up with an averaged
molecular weight of the mixture. Dry air contains mostly nitrogen
which has an atomic weight of 28 (about 79%), and then oxygen (about
20%) which has an atomic weight of 32, and the balance (about 1%)of
inert gases (Helium, argon, krypton, etc.) which have much smaller
atomic weights. For dry air r (small r that is) is about 287.
If the air is not dry, then you have to account for the water vapor in
the air by figuring out what partial pressure of water vapor is in the
air and then performing an average between the water vapor portion and
the other components of the air. Wator vapor only has a molecular
weight of 18 (1 Oxygen + 2 Hydrogens=18) and so is lighter than dry
air and tends to make the air less dense.
The partial pressure of water vapor that can be supported in the air
is a function of temperature that more or less grows exponentially
with temperature. I'm sure if you search the web you can find several
empirical equations for this. Relative Humidity (RH) is an expression
of how much water vapor is in an air sample versus the maximum that
can be supported at the current temperature of the air sample but what
you really want is the partial pressure of water vapor in the air.
There are sensors that can give this to you by measuring the
electrical conductivity of the air. Dry air is actually a very good
insulator, whereas water vapor decreases the insulating property of
the air.
All other things remaining equal, increasing the humidity will
decrease the density of the air.
All other things remaining equal, increasing the temperature will
result in decreasing density while decreasing temperature will result
in increasing density. If the temperature in your tunnel is different
than standard then you will need to account for this.
Tunnels generally heat up the air by the way when they accelerate the
air through the fan and also through boundary layer friction with the
tunnel walls. Many tunnels actually have heat exchangers to keep the
air from getting too hot. You will need to make sure you measure the
temperature at the same point thats you are measuring the static and
stagnation pressures in your your tunnel so that you can account for
its effects. Standard temperature is 15 degrees C or 59 degrees F.
For conversion purposes, 15 degrees Celsius =288.15 degrees Kelvin= 59
degrees Fahrenheit=518.6 degrees Rankine.
All other things remaining equal, increasing pressure will result in
increasing density, while decreasing pressure will result in
decreasing density. Barometric pressure is usually given by the
weather service as inches or millimeters of mercury or sometimes
millibars. For conversion purposes, 29.92
inHg=760mmHg=1000millibars=14.7 psi= 101325 Pascals pressure. If the
pressure in your tunnel is different than standard then you will need
to account for this.
Depending on tunnel velocity, you will also have to consider
stagnation versus static properties. Stagnation properties are what
you measure if you bring the flow at a point to a complete stop, i.e.
the kinetic (as opposed to random thermal) energy in the sample is
completely converted thermal energy. How you do this depends on what
speed of sample you are trying to measure and is the subject of whole
books. Suffice it to say that at low speeds there is little
difference between stagnation and static properties but the faster you
go, the less resemblance they bear to one another.
Compressibility is another issue. At low speeds air is
incompressible, but at higher speeds v>100m/sec, compressibility
becomes worth accounting for in your measurments.
At higher temperatures and velocities, (high supersonic, or
hypersonic, or high temperature >500 degrees C), the constant pressure
and constant volume (Cp and Cv) specific heat assumptions break down
and so does the gas law. The simplifications that can be made for
using the ratio of Cp/Cv (called gamma) also break down because Cp and
Cv and therefore gamma all stop being constants. Solving flow
problems in this regime becomes much more complex requiring numerical
models for Cp and Cv and requiring numerical (as opposed to simple
analytical) methods to compute flow properties.
Once you know the flow density, you can calculate air speed. For
lower speed low temperature tunnels (low subsonic) you can use a
simple incompressible Bernoulli equation for converting pitot-static
pressure to air speed. At higher speeds and temperatures this depends
on the regime (transonic, supersonic, hypersonic, etc.)
The Bernoulli equation is simply:
Pstagnation=Pstatic+1/2 rho * velocity^2
For lower speed supersonic, the isentropic gas relations are sometimes
used.
In any event, you have to be sure to get your units right. If you use
metric, pressure is Pascals (Newtons/m^2), rho is kg/m^3 and velocity
is meters/sec. It's harder in U.S/U.K units because of conversions
between slugs and pounds etc.
Also you have to consider the concept that there will be a steady
state average that you will measure and a transient/turbulent portion
that will occur for each parameter that you measure (temperature,
pressure, RH, etc.) that you will need to account for.
Once you know the air speed and the density, you can compute their
product - mass flow. Mass flow then can be used for other purposes
such as calculating performance properties if you are testing a jet
engine or propeller or something.
Hot wire anenometers work by heating a wire and measuring the
resistance of the wire. The faster the air flow past the wire
filament, the more it will cool. I don't remember the equations off
of the top of my head but I believe that there is a square rule
involved. Hot wires work better at lower speeds than pitot-static
sensors but both become less effective the slower you go.
LDV's are neat, high tech toys that I haven't had a chance to work
with yet but they measure the airspeed by measuring the doppler shift
in the light emitted by a laser beam going through the flow, much like
doppler (WX-88) weather radar works. They actually measure the speed
of the air more directly than the pitot-static or hot wire methods are
probably simpler to implement from an equations point of view but they
are very very expensive.
In conclusion, I know I have written a lot of stuff up here that
probably sounds pretty intimidating with regards to solving your
problem. It would help to eliminate some of this by telling us more
about your test problem so that we can make the appropriate
simplifying assumptions. Tell us more about the details.
Douglas De Clue
LabVIEW developer (and degreed Georgia Tech aerospace engineer)
[email protected]
Devont wrote in message news:<50650000000800000025530000-1027480788000@exchange.ni.com>...
> The problem is this: I'm setting up an airflow resistance test and I
> need to account for temperature and barometric pressure. However, I
> don't know how to setup LabVIEW to account for these variables.

Using LabVIEW for temperature control with AMREL SPS200-50-A022 power supply

Hi, I hope someone can help me out. I'm an ME undergrad with pretty much no knowledge of LabVIEW. I am working a project which requires a temperature controller. Previously, we were using an SPS120-10 power supply from AMREL and a grad student wrote a LabVIEW VI which performed feedback temperature control. The VI would acquire temperature from a Benchlink which acquire the temperature from a thermocouple. The VI also monitor the output voltage & current and determine the power output and heater resistance from those values. When a desired temperature is set, the VI compares the actual temperature to the set temperature and adjust the voltage/current setting to achieve the desired temperature. The VI was designed to keep temperature deviation to within +/-0.5 deg C. I'm not sure of the data refresh rate, but it's on the order of seconds since the system has a small thermal mass and we're operating in the 800+ deg C range. When we were using the SPS120-10, the device used GPIB for communication with the PC. Due to higher power output demand for the heater, we switched to an SPS200-50, which only has an RS-232 port. First of all, I was wondering if someone could help me modify the VI so that it could communicate with the SPS200-50 through the serial port? In addition, the drivers for the SPS120-10 and SPS200-50 might be different. If modifying the VI to communicate through the serial port isn't enough, I would need to figure out where to modify the VI with the SPS200-50 drivers, which is provided by AMREL. If anyone would like, I can send you the VI files so that you can take a look at the block diagram and tell me where to modify it. I'm still not 100% certain I understand how to read LabVIEW block diagrams.
Please let me know if you need any additional information. Any help would be appreciated. Thanks in advance!

I have looked over your vi. First of all you have to do some changes in the "ARSPS Initialize.vi" See picture.
The best way to check instrument communication is to send the *IDN? Command. The instrument will indentify itself in response to this command. The vi I have included is a labview example. Use this Vi to test your communication. Do not progress before this is working. The VI is also an excellent example on how to set up and close down RS232 communication.
The VI "Tfeedbackpowercontroller-nolvdt-Dinh.vi" looks OK so I guess it will work then your RS232 communication with the SPS200-50-A022 is working
good luck
PS as mentioned before you will find all the RS232 details in the instrument manual
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)
Attachments:
sample.PNG ‏38 KB
Basic Serial Write and Read.vi ‏29 KB

Resistance to temperature

Similar Messages

Maybe you are looking for