Remote strain gages

I have to measure from eight strain gage channels disposed at 100 m from the PC. The cheapest solution I found is to use a SC-2043-SG in a CA-1000 enclosure, a NI USB-6008 and a USB extender.
Question 1: in its User Manual, is mentioned that the outputs of SC-2043-SG are NRSE signals. Does this comply with the input specifications of NI USB-6008 ?
A: the 6008 only has differential and RSE input configurations. However, you can attempt to make it work by using the 6008 in differential mode and connecting AISENSE to the negative pin on each of the channels. NRSE is sort of like differential mode.
Question 2: is there enough space for inserting the NI USB-6008 in the CA-1000 enclosure (using some "home made" fixtures) and are there any thermal problems ?
A: there appear to be enough space to put both in the enclosure. The problem maybe be the thickness of the enclosure. It is 4.39 while the thickness of the 2043 is 4.6. The difference is in the millimeters, but could be a problem. Other than that, there should not be any other problem.
You can check these dimensions in the following PDFs:
http://www.ni.com/pdf/manuals/321738a.pdf
http://www.ni.com/pdf/manuals/371303a.pdf
http://www.ni.com/pdf/manuals/371201a.pdf
Good luck on your project

Similar Messages

I am running a strain gage test and can't get more than 1000 samples

A formor employee left a strain gage VI that I am attempting to reuse but no matter what I do I can,t get more than 1000 samples before needing to restart the loop. In the task timing (of NI-DAQmx) I have set the acquisition mode to N Samples and the clock settings to read 65000 samples at 25 Hz. There is a DAQmx timing(sample clock) VI that resets to finite samples and 1000 per channel when I close it but I have reset it to 65500 continious samples and left it open to no avail. There is a rate input to this sample clock on the front window that I have tried setting to several different rates to no avail. The Vi will run about 15 seconds, collect 1000 samples and then ask to verify the file location to save the data to. Upon verifying the file location the VI will run another 15 sec. loop before stopping for verification again.
If the loop is stopped rather thanhaving the file verified an error is listed:
Error-200278 occurred at DAQmx Read (Analog 1d WFm NChan NSamp).vi:1
The given possible reason given is: attempted to read a sample beyond the final sample acquired.
When I stop attempting to run the VI the block diagram opens with a dark block around file creation block. I need this VI to run for 10 min. collecting samples at about 25/sec. Can someone help me figure out what I am doing wrong?
I have made screen shots of the VI and the error code to assist finding the incorrect programing.
Thank you for your help.
Jim Steinmeyer
Jim Steinmeyer
Design Engineer
Reinke Mfg.
PO 566
Deshler NE 68340
[email protected]
Attachments:
strain test error.doc ‏493 KB

Thank you,
I was just thinking about being able to increse the size of the doc. for better visability. I have tried working with the rate input for the DaQmx for the sample clock and it does change the frequency of sampling, but I still get just the 1000 samples. I have included Jpegs this time. I have tried to exppand the two DAQ assistants that arn't expanded but am unable to, I also am unable to find a "propertys" command to open them up and see what exactly they do. The nested while loop for output also seems strange to me. Maybe I would be better to attempt a new program but being new to the language I thought using an existing program might be best.
Jim
Jim Steinmeyer
Design Engineer
Reinke Mfg.
PO 566
Deshler NE 68340
[email protected]
Attachments:
block diagram.JPG ‏134 KB
DAQmx.JPG ‏129 KB

Why do I need to connect QTR and S+ directly on the strain gage?

I connected two wires with a 2" 120-ohm strain gage. Later, connect these wires to a strip connector. Now connect the red wire from NI system (SCXI-1314 which is already converted for 120-ohm) to red in the strip. This red is P+ in SCXI-1314. Now I connect the black (QTR in SCXI-1314) and white (S+ in SCXI-1314) to the white wire on the strip connector. Unfortunately this did not work. I got a constant strain output. But when I connect the black (QTR in SCXI-1314) and white (S+ in SCXI-1314) to the strain gage directly it works fine.
I tried with 4 strain gages and got the same result.
It will be great if any one can tell me what went wrong?

Hi Shaurav,
Sorry, in my last post, I meant to say "SCXI-1520", which I am assuming you have because you have the 1314 terminal block. The SCXI-1520 has programmable gain, as mentioned HERE. Also, I recommend looking at THIS discussion forum post becauseit talks about the different ways to set that gain. Have you tried applying a gain in Measurement and Automation Explorer? How are you programming this? Thanks!
aNItaB
Applications Engineer
National Instruments
Digital Multimeters

How to I import MAX 4.6 config files into MAX 5.5? Missing Data Neighborhood. Strain gage set up is different.

I have been trying to import my config file from MAX 4.6 into a new system running MAX 5.5 and daq 9.8.
The data neighborhood does not appear, however my application sees the information. How can this be remedied? Start over? I have a lot of inputs and would rather not have to recreate all of them.
What is the difference between the strain gage settings in MAX 4.6 and MAX 5.5? The selection box for the bridge in 4.6 has a selection for "let niDAQ choose". Seems that is necessary to use the 4.6 config data. Try though I might, the readings in 5.5 do not match those in 4.6.     Is there a work around fo this? I don't want to have to perform an entire system calibration.
Thanks
Chris
Solved!
Go to Solution.

Attached JPG's.
Here is more information regarding the MAX Strain Set Up.
Attached are screen shots from MAX 4.6 and MAX 5.5.
Hardware: PXI chassis with bridge to a PC. SCXI-1520 input card.
Software: Old system: Windows XP SP2 running MAX 4.6 with niDAQmx 9.0.2,   programming in LabView 2011
                   New system: Windows 7 running MAX 5.5 with niDAQmx 9.8. Programming in LabView 2013
5.5: What is the gage factor? Is that the mv/v sensitivity of the load cell?
5.5: Asks for Gage resistance, easy to look up and I entered the data, 350.
5.5: How do I determine the Initial Voltage?
5.5: No choice of using V Excitation for scaling
5.5: Is Full Bridge I the same as 4.6 Full Bridge?
5.5: Requires use of Strain in scale factor
4.6: Requires use of Volts in scale factor (flags an error if I try Strain and requests Volts)
4.6: Choosing to use Vex for scaling makes readings look similar to 5.5 readings, but still not correct. ie around -79 in 5.5 and around -50 in 4.6 vs. 5.2 without.
Is there a way to set MAX 5.5 so that it provides the same starin set up function as 4.6? If so, what is it?
Thanks,
Attachments:
Max 4.6 Strain Set Up.jpg ‏32 KB
Max 5.5 Strain Setup.jpg ‏23 KB
MAX 4.6 Strain Scale 2.JPG ‏165 KB

Which module of CompactRIO can be used to measure strain gage

I wonder which module of compactrio can be used to measure strain gage. or should i use the analog input module to measure the value and use the analog output module to excite the bridge?

Hello,
You are correct that you can use any of the analog input modules to take measurements, and use analog output modules for bridge excitation. You might also need to add other external components for bridge completion, depending on your sensor.
Regards,
Vineet A.

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.
The problem comes up when i try to use two modules for reading 16 gages. I modified the getting started example in serveral ways without any success, only can read continuously the 9235 on slot 1, and apparently, i only get an initial reading on the other 9235, and then nothing more. Below is attached the code (note that i am no expert on FPGAs, and i've been trying different configurations, and at some point, not precisely knowing what i was doing ), any advice on how to put both 9235 to work simultaneously will be appreciated.
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:
one FIFO for acquiring data from both modules
used single I/O nodes for start/stop and acquiring data from both modules
changed the clock settings of the modules to: slot1 module providing clock signal for the slot2 module
the only big difference that i notice between the example is that i added the shunt calibration procedure to the sequence, do you think this is the problem?
summing up, i havent been able to obtain continuous readings from the second module, any additional help could be greatly appreciated.
best regards.

How to connect 2-wire strain gage to NI 9237 by quarter bridge

I have a Strain Gage: KYOWA KFG-20-120-C1-11 (2 wire) http://www.kyowa-ei.co.jp/english/products/gages/pdf/kfg-01.pdf, NI 9237 on a Compact DAQ (cDAQ 9174) and RJ-50 (10-pin modular plug to pigtail wires).
Strain Gage features:
Gage Factor: 2.08 +/- 1.0%
Gage Resistance: 120.2 +/- 0.2 Ohms
I'd like to connect them to measure the strain with quarter bridge configuration but I have some doubts about which line goes to which terminal.
Thanks.
Solved!
Go to Solution.

You can find the manual for the NI 9237 module here
It's a good idea to buy an NI 9944 or NI 9945 Quarter Bridge Completion Accessory if you're planning on using this module with a quarter bridge configuration, but you can look at the following diagrams to see what kind of internal connections are implemented: Connecting Strain Gauges and Shunt Resistors to the NI 9237
PS Posting in the DAQ or signal conditioning forums instead of Labview may get you better/faster answers.
Cheers
Message Edited by mishkin on 03-11-2010 02:40 PM
Misha

Problems with Sampling rate in LabVIEW with 1/4 bridge strain gage

Hello,
I have a question. I have SCXI 1001 and am trying to read strain gages and thermocouples. In the slot 1 I have a 1122/1322 with thermocouples that works great. In slot 2 I have a 1121/1321 that needs help. I cannot figure out how to make a LabVIEW program to read the strain gage.
Is computer hardware a factor? I have a relatively old Dell, 1.7 ghz, 256 MB RAM, and all of my programs bog my machine down. My thermocouple program with 1 functioning channel takes almost 2 minutes to load.
Anyway, I program the DAQ assistant like I think it should be done, but I am having problems with the sampling rate. Everytime I run the program I get an error message saying that it could not get the recommended samples in time. I have had my delay time on my While Loop as low as .25 s and as high as 1.5 s. I have changed my sampling rate from 1 hz to 1000 hz.
I would really appreciate any and all help on this matter. I am still very new to LabVIEW. <I could not contain my excitement when my thermocouple program worked>
Thanks,
CDawgttu

Hi CDawgttu,
I think the best thing that we can do for the moment is to try and see what the maximum rate you can get on the 1121 is, when working on its own.
According to the DataSheet the 1122 is more likely to be what's slowing you down. There could also be some concerns with how the internal jumpers are set on the 1121, so you may want to make sure that the settings there match how you have configured your board in Measurement and Automation Explorer.
-You can set this up by right clicking on the SCXI module and adjusting the Properties. On the Jumpers Tab you should then make sure the values match what you've set internally (SCXI-1121 User Manual - Chapter 2)-
When you use just the 1121, see if that makes a difference in your overall application speed.
Finally, it may be easier to use an example program than the DAQ Assistant since you are using such an old machine. You can find Strain Gauge examples by opening LabVIEW and following this path:
Help > Find Examples > Browse > Hardware Input and Output > DAQmx > Analog Measurements > Strain > Cont Acq Strain Samples.vi
I hope some of these tips get you pointed down the right path.
Regards,
Otis
Training and Certification
Product Support Engineer
National Instruments

I am confused by instructions for calibrating strain gages.

Hi all,
In my quest to learn all things some things LabView I am attempting to calabrate my strain gages prior to running a test. Using the Measurement and Automation program I open the NI-DAQmx tasks and run the Channel Calibration Wizzard. I have 5 SCC-SG02s in my signial conditioning block with a total of 10 gages, Does this mean 10 channels? In the Wizzard step one asks for a reference value of the measurement. Where do I get this reference value? Then I am instructed to setup the signial to take a measurement at this value, again I ask, how? If I enter numbers in the reference value slots to procede, I next come to a message that my values did not encoumpass the channel's range and endpoints, how do I determine what they are? And do I need to encoumpass them? Is there a tutorial that covers this with examples and better descriptions or do I need to keep asking questions of the forums?
Thank you for your help.
Jim Steinmeyer
Design Engineer
Reinke Mfg.
PO 566
Deshler NE 68340
[email protected]

Hi Jim,
Hopefully this will clarify things for you but if not just post back.
I have 5 SCC-SG02s in my signial conditioning
block with a total of 10 gages, Does this mean 10 channels?
Yes, you need to calibrate the measurement of each channel. In this case you have 5 modules with 2 channels each.
In the
Wizzard step one asks for a reference value of the measurement. Where
do I get this reference value?
The reference value for the measurement should be at least the low end and the high end of the signal you're measuring. So lets say you expect to read a value of 50mV you should calibrate for 0mV and 50mV at a minimum. You can enter as many calibration references as you want and it's recommended you do at least 2.
Then I am instructed to setup the
signial to take a measurement at this value, again I ask, how?
I believe it's already set up to take the measurement. You can pause and start it with the button on the right of the wizard.
If I
enter numbers in the reference value slots to procede, I next come to a
message that my values did not encoumpass the channel's range and
endpoints, how do I determine what they are?
The range of the SG02 is +/-100mV.
And do I need to
encoumpass them?
It suggests you calibrate if for values that
encompass the full range of the device but it will let you procede with
the calibration if you don't want to do that.
Is there a tutorial that covers this with examples and
better descriptions or do I need to keep asking questions of the forums?
The following two tutorials provide more information on the Calibration Wizard and the theory behind calibration:
System Calibration
NI-DAQmx Professional Tools
Hope this helps.
Regards
Message Edited by SarahB on 07-06-2006 09:14 AM
Sarah
Applications Engineer | National Instruments | UK & Ireland

Does the SCC-DI01 can be set as a trigger for strain gage measurement?

I used the SCC-SG01 to measure the strain. I need a trigger to activate the gages to get the data when the test happen. Can I use the SCC-DI01 as a trigger for gages for my test? If I can, how I can do it?

Hello hopezx,
The 2345 is a fairly passive device that does not actually have a lot built into it other than the signal conditioning. So the actual thing that we need to look at is the DAQ card that you have attached to the 2345. What you need to check on is the product page on ni.com to see if your device support digital triggering. If it does, then you can use a digital trigger for your task just like any other.
Please post back if you have any other questions or would like some more details. If you do post back, please make sure to let us know what other hardware you are using.
ColeR
Field Engineer

2010 Mac book pro, every time I do something remotely straining, i.e. open up league of legends, screen goes black, power light stays on but nothing works. Its been doing it since I downloaded lion, I just want to know how to resolve it? Come on apple.

I’m going into my third year of graphic design and I’ve had this laptop since mid 2010. I can’t use any of my adobe programmes fluently without it shutting down or play any games. I'm 2 grand into my overdraft and don’t come from a wealthy background, I saved up for about 2 years to get the laptop to help me with my studies and I certainly didn’t pay nearly 2 grand for something that looks nice that I can go on Face book on.
I’ve looked at various threads and posts and it seems lots of people have the same problem but no resolution. Please don’t comment if you have the same problem because I’m trying to get this sorted out not build a group of friends with **** laptops. I think this problem needs to be addressed and apple need to stop ******* ignoring the minority of 2010 Mac book owners that haven’t got a heavy back pocket to fix the glamorised laptop when it ***** up after a year of buying it. Its supposedly a high powered machine, I shouldn’t have to cack myself every five minutes over whether opening a certain programmes going to shut down my computer. Its affecting my education and patience.
This is the error message that occurs about 8 times a day when it does it. Surely someone can make sense of it.
Interval Since Last Panic Report: 74882 sec
Panics Since Last Report:          2
Anonymous UUID: C2EACECC-F8B9-4762-8CEE-F3A9B9FE756A
Fri Jun 15 18:29:27 2012
panic(cpu 0 caller 0xffffff7f80918947): NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xd2000000 0xffffff809f006000 0x0a5480a2, D0, P2/4
Backtrace (CPU 0), Frame : Return Address
0xffffff807b8132b0 : 0xffffff8000220792
0xffffff807b813330 : 0xffffff7f80918947
0xffffff807b8133c0 : 0xffffff7f80a08aa4
0xffffff807b813410 : 0xffffff7f80a08b64
0xffffff807b813470 : 0xffffff7f80cb5749
0xffffff807b8135b0 : 0xffffff7f80a27bed
0xffffff807b8135e0 : 0xffffff7f809222c2
0xffffff807b813690 : 0xffffff7f8091dbc4
0xffffff807b813880 : 0xffffff7f8091f7c9
0xffffff807b813960 : 0xffffff7f817c4130
0xffffff807b8139a0 : 0xffffff7f817d3790
0xffffff807b8139c0 : 0xffffff7f817ef3f4
0xffffff807b813a00 : 0xffffff7f817ef459
0xffffff807b813a40 : 0xffffff7f817d7605
0xffffff807b813a90 : 0xffffff7f8178df6f
0xffffff807b813b10 : 0xffffff7f8178c9e0
0xffffff807b813b40 : 0xffffff7f81792435
0xffffff807b813b70 : 0xffffff800065553d
0xffffff807b813be0 : 0xffffff80006558dc
0xffffff807b813c40 : 0xffffff800065609b
0xffffff807b813d80 : 0xffffff80002a3f08
0xffffff807b813e80 : 0xffffff8000223096
0xffffff807b813eb0 : 0xffffff80002148a9
0xffffff807b813f10 : 0xffffff800021bbd8
0xffffff807b813f70 : 0xffffff80002aef20
0xffffff807b813fb0 : 0xffffff80002daa33
      Kernel Extensions in backtrace:
com.apple.NVDAResman(7.1.8)[560E1257-BF5E-3B0B-95F0-15033A0D1B97]@0xffffff7f808 b8000->0xffffff7f80b91fff
dependency: com.apple.iokit.IOPCIFamily(2.6.8)[F63D4ABE-42DA-33EF-BADD-3415B0CB0179]@0xffff ff7f80843000
dependency: com.apple.iokit.IONDRVSupport(2.3.2)[D05CFB53-FB72-3613-8162-2D188DB04738]@0xff ffff7f808a6000
dependency: com.apple.iokit.IOGraphicsFamily(2.3.2)[2D2A4A31-EB4F-3730-BE3A-76C061685FC5]@0 xffffff7f8086e000
com.apple.nvidia.nv50hal(7.1.8)[7596DB8C-AE9D-3C87-B11A-0ED8F940CAF8]@0xffffff7 f80b92000->0xffffff7f80eb3fff
dependency: com.apple.NVDAResman(7.1.8)[560E1257-BF5E-3B0B-95F0-15033A0D1B97]@0xffffff7f808 b8000
com.apple.GeForce(7.1.8)[00925AF3-22EE-3858-8BD3-06AE57DFCC86]@0xffffff7f817750 00->0xffffff7f81834fff
dependency: com.apple.NVDAResman(7.1.8)[560E1257-BF5E-3B0B-95F0-15033A0D1B97]@0xffffff7f808 b8000
dependency: com.apple.iokit.IONDRVSupport(2.3.2)[D05CFB53-FB72-3613-8162-2D188DB04738]@0xff ffff7f808a6000
dependency: com.apple.iokit.IOPCIFamily(2.6.8)[F63D4ABE-42DA-33EF-BADD-3415B0CB0179]@0xffff ff7f80843000
dependency: com.apple.iokit.IOGraphicsFamily(2.3.2)[2D2A4A31-EB4F-3730-BE3A-76C061685FC5]@0 xffffff7f8086e000
BSD process name corresponding to current thread: WindowServer
Mac OS version:
11E53
Kernel version:
Darwin Kernel Version 11.4.0: Mon Apr 9 19:32:15 PDT 2012; root:xnu-1699.26.8~1/RELEASE_X86_64
Kernel UUID: A8ED611D-FB0F-3729-8392-E7A32C5E7D74
System model name: MacBookPro6,2 (Mac-F22586C8)
System uptime in nanoseconds: 1415238441194
last loaded kext at 45731121681: com.apple.driver.AppleHWSensor            1.9.5d0 (addr 0xffffff7f81e97000, size 28672)
last unloaded kext at 376926463799: com.apple.driver.AppleUSBUHCI            4.4.5 (addr 0xffffff7f8109d000, size 65536)
loaded kexts:
com.manycamllc.driver.ManyCamDriver            0.0.9
com.apple.driver.AppleHWSensor            1.9.5d0
com.apple.filesystems.autofs            3.0
com.apple.driver.AppleMikeyHIDDriver            122
com.apple.driver.AppleHDA            2.2.0f3
com.apple.driver.AppleUpstreamUserClient            3.5.9
com.apple.driver.AppleMCCSControl            1.0.26
com.apple.driver.AppleMikeyDriver            2.2.0f3
com.apple.driver.AudioAUUC            1.59
com.apple.driver.AGPM            100.12.42
com.apple.driver.AppleIntelHDGraphics            7.1.8
com.apple.driver.AppleIntelHDGraphicsFB            7.1.8
com.apple.driver.SMCMotionSensor            3.0.2d6
com.apple.driver.AppleSMCPDRC            5.0.0d0
com.apple.iokit.IOUserEthernet            1.0.0d1
com.apple.iokit.IOBluetoothSerialManager            4.0.5f11
com.apple.driver.AppleSMCLMU            2.0.1d2
com.apple.Dont_Steal_Mac_OS_X            7.0.0
com.apple.driver.AudioIPCDriver            1.2.2
com.apple.GeForce            7.1.8
com.apple.driver.ACPI_SMC_PlatformPlugin            5.0.0d0
com.apple.driver.AppleMuxControl            3.0.16
com.apple.driver.AppleLPC            1.5.8
com.apple.driver.AppleUSBTCButtons            225.2
com.apple.driver.BroadcomUSBBluetoothHCIController            4.0.5f11
com.apple.driver.AppleUSBCardReader            3.0.1
com.apple.driver.AppleUSBTCKeyboard            225.2
com.apple.driver.AppleIRController            312
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless            1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib            1.0.0d1
com.apple.BootCache            33
com.apple.iokit.SCSITaskUserClient            3.2.0
com.apple.driver.XsanFilter            404
com.apple.iokit.IOAHCISerialATAPI            2.0.3
com.apple.iokit.IOAHCIBlockStorage            2.0.3
com.apple.driver.AppleSmartBatteryManager            161.0.0
com.apple.driver.AppleFWOHCI            4.8.9
com.apple.driver.AirPort.Brcm4331            530.4.20
com.apple.driver.AppleUSBHub            4.5.0
com.apple.iokit.AppleBCM5701Ethernet            3.1.2b2
com.apple.driver.AppleEFINVRAM            1.5.0
com.apple.driver.AppleAHCIPort            2.3.0
com.apple.driver.AppleACPIButtons            1.5
com.apple.driver.AppleUSBEHCI            4.5.8
com.apple.driver.AppleRTC            1.5
com.apple.driver.AppleHPET            1.6
com.apple.driver.AppleSMBIOS            1.8
com.apple.driver.AppleACPIEC            1.5
com.apple.driver.AppleAPIC            1.5
com.apple.driver.AppleIntelCPUPowerManagementClient            193.0.0
com.apple.nke.applicationfirewall            3.2.30
com.apple.security.quarantine            1.3
com.apple.driver.AppleIntelCPUPowerManagement            193.0.0
com.apple.kext.triggers            1.0
com.apple.driver.DspFuncLib            2.2.0f3
com.apple.driver.AppleSMBusController            1.0.10d0
com.apple.iokit.IOSurface            80.0.2
com.apple.iokit.IOSerialFamily            10.0.5
com.apple.iokit.IOFireWireIP            2.2.4
com.apple.driver.AppleHDAController            2.2.0f3
com.apple.iokit.IOHDAFamily            2.2.0f3
com.apple.iokit.IOAudioFamily            1.8.6fc17
com.apple.kext.OSvKernDSPLib            1.3
com.apple.driver.ApplePolicyControl            3.0.16
com.apple.driver.AppleSMC            3.1.3d8
com.apple.driver.IOPlatformPluginLegacy            5.0.0d0
com.apple.driver.AppleSMBusPCI            1.0.10d0
com.apple.driver.AppleGraphicsControl            3.0.16
com.apple.driver.IOPlatformPluginFamily            5.1.0d17
com.apple.driver.AppleBacklightExpert            1.0.3
com.apple.nvidia.nv50hal            7.1.8
com.apple.NVDAResman            7.1.8
com.apple.iokit.IONDRVSupport            2.3.2
com.apple.iokit.IOGraphicsFamily            2.3.2
com.apple.driver.AppleUSBBluetoothHCIController            4.0.5f11
com.apple.iokit.IOBluetoothFamily            4.0.5f11
com.apple.iokit.IOSCSIBlockCommandsDevice            3.2.0
com.apple.iokit.IOUSBMassStorageClass            3.0.1
com.apple.driver.AppleUSBMultitouch            227.1
com.apple.iokit.IOUSBHIDDriver            4.4.5
com.apple.iokit.IOSCSIMultimediaCommandsDevice            3.2.0
com.apple.iokit.IOBDStorageFamily            1.6
com.apple.iokit.IODVDStorageFamily            1.7
com.apple.iokit.IOCDStorageFamily            1.7
com.apple.driver.AppleUSBMergeNub            4.5.3
com.apple.driver.AppleUSBComposite            4.5.8
com.apple.iokit.IOSCSIArchitectureModelFamily            3.2.0
com.apple.iokit.IOFireWireFamily            4.4.5
com.apple.iokit.IO80211Family            420.3
com.apple.iokit.IOEthernetAVBController            1.0.1b1
com.apple.iokit.IONetworkingFamily            2.1
com.apple.iokit.IOUSBUserClient            4.5.8
com.apple.iokit.IOAHCIFamily            2.0.8
com.apple.driver.AppleEFIRuntime            1.5.0
com.apple.iokit.IOHIDFamily            1.7.1
com.apple.iokit.IOUSBFamily            4.5.8
com.apple.iokit.IOSMBusFamily            1.1
com.apple.security.sandbox            177.5
com.apple.kext.AppleMatch            1.0.0d1
com.apple.security.TMSafetyNet            7
com.apple.driver.DiskImages            331.6
com.apple.iokit.IOStorageFamily            1.7.1
com.apple.driver.AppleKeyStore            28.18
com.apple.driver.AppleACPIPlatform            1.5
com.apple.iokit.IOPCIFamily            2.6.8
com.apple.iokit.IOACPIFamily            1.4
Model: MacBookPro6,2, BootROM MBP61.0057.B0F, 2 processors, Intel Core i7, 2.66 GHz, 4 GB, SMC 1.58f15
Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 512 MB
Graphics: Intel HD Graphics, Intel HD Graphics, Built-In, 288 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533642465238432D47372020
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533642465238432D47372020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.106.198.4.20)
Bluetooth: Version 4.0.5f11, 2 service, 11 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: Hitachi HTS545050B9SA02, 500.11 GB
Serial ATA Device: MATSHITADVD-R   UJ-898
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfa100000 / 2
USB Device: Optical USB Mouse, 0x046d (Logitech Inc.), 0xc016, 0xfa140000 / 6
USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0237, 0xfa120000 / 5
USB Device: BRCM2070 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 4
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8218, 0xfa113000 / 9
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfa130000 / 3
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfd100000 / 2
USB Device: Built-in iSight, apple_vendor_id, 0x8507, 0xfd110000 / 4
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 3

To operate your computer with an external monitor attached and the display closed:
1 Connect a USB keyboard and mouse to your MacBook Pro.
2 Connect the power adapter to the MacBook Pro and a power outlet. Check that the power adapter light is on.
3 Close the MacBook Pro display to put the computer to sleep.
So when your lid is closed your laptop goes to sleep. This is expected behavior.

Need a VI for strain gages that will operate using LabView v 8.5

I am looking for an example VI similar to the one found at http://zone.ni.com/devzone/cda/epd/p/id/3942 that will operate with my LabView v 8.5. All of the examples that I can find say that they will not work with my LabView because they were generated using v 6.1.
gasseous
One test is worth a thousand expert opinions

Hi,
I will look into updating the example on the website. For now, give this VI a try. Let me know if you need it saved in a different version but I think it should work with LabVIEW 8.5.
Message Edited by Eric A. on 05-09-2008 03:38 PM
Eric A.
National Instruments
Distributed I/O Product Support Engineer
Attachments:
fp_sg_140-11.vi ‏134 KB

Constant current excitation for strain gauges

Ideally I would like to log 46 strain gauges using a scxi-1000. At the moment we have two 1102B modules, one 1100 module, and a 1122 module.
The 1122 module supports quarter bridge strain gauges but is very limited in scan rates when logging 16 strain gauges all at once.
Stuart from ni gave me an idea of constant current excitation for the strain gauges. The 1581 would be very suitable seem it delivers 32 channels of costant current and would suit the 32 channels of the 1102B we already have. Only problem is whether the 100 micro amps will be sufficient current to excite the strain gauges with reasonable accuracy.
The remaining strain gauges that wouldn't fit into the 1581 would run on a 6 channel strain gauge amplifier and then run through the other 1102 module we have and use a datataker for any left overs.
Any other suggestions? I have looked into buying either the 1521B for 24 channel quarter bridge or two 1520's but am unable to purchase these at the current time.
Thanks for your time.
Message Edited by Peter W Brown on 01-11-2006 09:55 PM

The full range of a strain gage in most applications is going to be
less than 1 ohm, which means that a typically strain application needs
to be able to measure the output on the order of fractions of an ohm to
be even remotely close to accurate.
The reason strain gages are typically put in a bridge configuration is
so that their output can be centered around 0V which enables the signal
conditioning module to apply very large amounts of gain to the
measurement (up to 2000 on the SCXI-1520). Without this gain, the
sensitivity of the strain gage is so small that you will be very
hard-pressed to get remotely accurate readings.
For this reason alone, I don't think there is a current-excitation
solution available that will enable you to get sufficient resolution
from the strain gage reading.
The SCXI-1521 is probably your best solution for measuring a large
number of quarter bridge strain gages. If you also need to measure
other bridge configurations (i.e. half or full) then the SCXI-1520 is
your other option.
-Logan K

Please tell me how to connect 3-wire-strang gage to NI 1314 (SCXI1520) by 1/4 bridges

I'd like to connect 3 wire strain gage to NI-1314 (SCXI-1520) to measure the strain with quarter bridge configuration
Please show me which line goes to which terminal..

Hello blackburn,
All of the wiring information is included in the SCXI-1520 user manual. Navigate to Chapter 2 >> Connecting Bridge Sensor Signals >> Quarter-Bridge Type I. The link below will take you to a PDF version of the manual.
http://www.ni.com/pdf/manuals/322583b.pdf
I hope this helps!
Matthew C
Applications Engineer
National Instruments

Using third party Strain Amplfiers, feeding DC output to NI 1102 multiplexer to increase channel count, has anyone a vi. already?

As I see required events, measure un-strained millivolt value, file, after applying force, measure strained millivolt value, determine difference between strained and unstrained, convert delta millivolts to strain, and present.
Using NI strain gage boards is good, if we already had them. They are either 4 or 8 chan/board. Amplifiers we already have along with several NI 1102 multiplexed boards. These allow us 32 strains/board.
Calibration can be done by using external shunt with calculated equivalent strain, setting amplifier gain accordingly i.e., 1000ue=1.0 volts.
Can eventually arrive at working vi., but if someone has done this and
are willing to share, it would be of great benifit. Time is always of the essence.

Hello,
Have you taken a look at the Convert Strain Gauge Reading VI that ships with LabVIEW? You could still use an amplifier and then divide the input voltage by the gain and then feed the output to this conversion VI. The VI can be found by searching you functions palette for the word �strain�.
Just let us know if this will help out!
-Justin T.
National Instruments
Also, you can change the type of this VI by right clicking and selecting Select Type.

Remote strain gages

Similar Messages

Maybe you are looking for