1520 Strain Measurement

Hello All,
I am using SCXI 1520, Terminal Block 1314 and DAQ 6035 E Card, for
Strain Gauge Measurement.
We have got a Strain Gauge of 120 Ohm with the NI Hardware which was
connected to CH02(One of the 8 channels provided), Now my problem is
that if I connect the Strain Gauge to some other channel(except Channel
2) I am not able to get any readings , and if I reconnect it back to
Channel 2 it gives prorper results.
I have connected the strain Gauge in
a Quarter bridge Configuration(obviously for a Single Strain Gauge) as
per the circuit diagram provided correctly.
I have Pentium -4 , 256MB RAM, Win XP SP2 machine.
Could anybody please try to explain where I am going wrong.
With Regards
Sandeep

I agree, please check this measurement in MAX by setting up a DAQmx Strain Gauge Task, or by using the test panels associated with the chassis if you are using Traditional DAQ. What happens when you change the channel you are using and test it using MAX? Is the signal responsive, but inaccurate? Is it just displaying 0, 10, -10?
If you are able to measure correctly, then just make sure you are changing the channel in your program.
If the signal is there and responsive with what is happening to the strain gauge, but inaccurate, you may have an offset error that can be corrected with the calibration resistor. The completion resistors of the 1520 should be checked as well. Make sure they are the correct values.
http://digital.ni.com/manuals.nsf/websearch/56E77CCD7B41AA8386256968005BBB73
The DAQ Driver version would also be helpful if you are still having problems.

Similar Messages

Strain measurement using 9237 and cDAQ 9172

I am trying to measure strain using a 9237 and cDAQ 9172.
The strain gage is connected to 9945 (Red wire to EX+, White to IN+ and Black to QTR terminal also tried connected the white and black to IN+ terminal).
The 9945 is connected to 9237 quarter bridge strain measurement module on a cDAQ 9172. I have two 9237 on the cDAQ 9172.
The device passes the test in MAX.
The problem is I cannot read the strain value.
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Attachments:
Strain measure.vi ‏19 KB

Hi jujare,
In the VI you attached, you don't have the bridge configuration set up. The default is full bridge I, so if you have a quarter or half bridge wired up, that is one reason you could be getting bad data. I'd suggest you take a look at "Cont Acq Strain Samples(With Calibration)-NI 9237.VI" in the Example Finder. It shows the configuration for bridge type and has some handy wiring diagrams. You could also add controls to your vi to set the bridge configuration if you'd prefer.
If your strain gauge only has three wires, it's probably a half or quarter bridge. A full bridge needs at least four wires.
I hope this helps!
Regards,

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Hi!
I am trying to set-up a strain measurement VI using Labview. I am using NI 9219 module on NI cDAQ 9172 chassis. My strain gage is configured in a quarter-bridge arrangement and I have made strain gage connection accordingly (to terminals 3 & 5 in NI 9219). However, I do not understand what are TEDS terminals for and what to connect to those terminals. Can I use virtual TEDS for this? I couldn't find a virtual TEDS for NI 9219. Any information in resolving this issue would be highly appreciated.
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Solved!
Go to Solution.

Hi, the TEDS terminals are only for transducers, like a strain gauge, that support TEDS (Transducer Electronic Data Sheet). The TEDS standard is just the ability of a transducer to save information about itself in internal memory. This information includes things like calibration constants and dates, scaling factors, electrical characteristics, etc. It is stored in a standard template which can be read by computers and DAQ cards via those TEDS lines. For you application, you should just leave them unwired, and setup up your strain gauge normally.
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Check out LabVIEW 2009 and the New X-series DAQ!

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Hi Alvin788,
Do you presently use any hardware to measure these or are you enquiring as to what hardware/software you will need? Are you planning to use LabVIEW? The following three links talk about measuring Load Cells as well as Strain Gauges
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This post will also be highly helpful.

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Hi Tickle
It looks like the driver you are using is supported by a third party. I took a look at the driver you are using and it has a couple of examples included with it. I would recommend taking a look at these examples as they are normally a good starting point for communicating with your device. Has anyone else used this device in LabVIEW?
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I would like to programatically make settings on the SCXI 1520 Strain Gauge module. From MAX, I see that you can set the Gain, Fil

ter cutoff freq, Voltage Exc, and Bridge Config. And from the LabVIEW help for AI Parameter, that these correspond to parameters 13,14, 17 and ?. Bridge Configuration is not listed. Which parameter is used to set this? Is there an example VI available?

Hi Frank -
Looks like Michael's post from 2001 is no longer current. Let's update the list of resources available for this module.
You can find the user manual for anything at ni.com/manuals. The manual for the SCXI-1520 is currently here.
If you're programming in LabVIEW, you can find example programs for this device in the Example Finder. (Click Help » Find Examples to open it.) I recommending filtering by your hardware. To do so, click the Hardware list in the bottom-left of the window and select "Add device". After adding the SCXI-1520, select it from the list and check the Limit results to hardware box. This will filter our examples down to the ones that work with your device. They'll probably all be in the "Hardware Input and Output » Analog Measurements » Strain" folder.
You can also search Support for the 1520 to see KnowledgeBase articles on it.
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Sudden spike in strain measurement

Hi!
I have a PXI 1062Q Chassis, 8108 controller (Windows OS), one PXI 4472 module(Slot 2) & two PXI 4331 modules(Slot 3 & Slot 5). The test scenario involves measurement from strain gauges mounted on a plate which is subject to some impact. But when I try to acquire strain data in the quarter bridge configuration from all the 16 channels at 100 K sampling rate, I find that there is a sudden spike in the data apart from the one observed due to the impact (Please refer attached pics). This spike is seen at exactly the same instant across all the channels. The following are the settings used for strain channel acquisition.
Acquisition Mode :Continuous Samples
Sampling Rate :100K
Samples to Read :10 K
Maximum Limit :1.5m
Minimum Limit : -1.5m
Strain Configuration :Quarter Bridge I
Voltage Excitation Source :Internal
Excitation Voltage :2.5V
Gage Resistance :120
Gage Factor :2
Note: Offset nulling & Shunt calibration are enabled (100K shunt resistor in R3 location)
The application was built using LabVIEW 2011 and DAQmx driver version 9.3.5
Can somebody please tell me what could be the possible reason behind this phenomenon?
Thanks in advance!
Shweta JP
Attachments:
Data with spike_1.png ‏34 KB
Data with spike_2.png ‏36 KB

Shweta_JP wrote:
Hey Lynn!
It's just a 1 sample spike in the positive & negative direction. Could an electrical transient result in such a small duration spike??
Shweta JP
EMC spikes could be of any length....
A good software spike filter is the median filter, here a filter rank of +-3 should do the job...
Looking at your picktures it seems that they appear in a close relation to your trigger ...
Crystal_ball_mode: You wrote impact test.... is there some sort of solenoid/relay/inductive release involved ? Without snubber they can be a source for such spikes....
Spoiler (Highlight to read)
Greetings from Germany
Henrik
LV since v3.1
“ground” is a convenient fantasy
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Strain measurment and write to file with NI9237

Hopefully this lab view VI can help some of the novices like myself to acquire strain using the NI9237 and write to a file. The example VI available from NI "Cont Acq Strain Samples (with calibration)" is fine for sampling data and viewing on a chart, but you need to add your own elements if you want to logg data or write to a file.
Since aquistion is continuous, reading and writing data must be done at discrete intervals rather than continuously, or, you will end up with a very large file that can not be easily handles in excel. Also, data gets acquired in "packets" of several samples for each channel, so even if you put a write function within a case structre, as I have done ,and you don't convert the data you get that whole "packet" every time the comand writes to file. Again, you will end up with a lot more data points than you would like.
Though the top level VI is pretty simple, it took me some time and help from many folks for me to figure out what was going on. I thought I would share.
Thanks to Sandra T, Jarrod B, Kyle B, Marc A, Herbert E and Jesse O. for your help
Next goal is to acquire voltage from a different Daq card, convert to load and graph and write load vs. displacement.
hopefully the attached files are the correct method so the VI fuctions with its sub-VI's. If not let me know.
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A. Lopez
Attachments:
Cont Acq Strain-Qbridge-I-write to file-NI9237.vi ‏199 KB
Measure Strain.llb ‏238 KB

Alfonso,
I'm glad you got your application running. It is also nice that you are wanting to share your code. NI is currently testing a new system that allows community members to share code. If you like, you can also submit your code here.
Regards,
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Applications Engineering
National Instruments
Jesse O. | National Instruments R&D

Errors in strain measurement system

I am trying to measure strain using SCC SG04, SC2345, and M series PCI 6221. The system is saying that it is not installed properly even though MAX is recognizing the devices. If anyone has set up a similar system could they please help out. Project deadline is getting very close and i am in a bad way

Dr. Imad wrote:
what is not installed properly ? the M card or the SC2345 ?
Once the card is installed, go to max and verify that you see it in Max. Once this is done
under
devices and intefaces
right click---create new
select DaqMx SCC-connector block-----SC2345
Then you configure the SC2345, Type, where SG04 is installed (J1....) etc
then you should be able to access it from LabView. You may want to use Daq assisitant first.
Dr. Imad wrote:
what is not installed properly ? the M card or the SC2345 ?
Once the card is installed, go to max and verify that you see it in Max. Once this is done
under
devices and intefaces
right click---create new
select DaqMx SCC-connector block-----SC2345
Then you configure the SC2345, Type, where SG04 is installed (J1....) etc
then you should be able to access it from LabView. You may want to use Daq assisitant first.
I have done as you recommended. The Daq board does show up in max. I have added the connector block and the strain module. That seems ok until i do a self test and it fails. It says in the error message that the device may not be working properly or is not properly installed. I have removed the whole system and reinstalled it only to get the same error message. In the device manager in windows 2000 it says that the DAQ card is working properly. When i go to the drivers tab it says that the driver provider is National Instruments but the date and version are unknown. It is not digitally signed. I have tried to install a driver for this namely NIDAQ7.3CD1.zip and NIDAQ7.3CD2.zip but this doesn't make any difference. The DAQ assistant didn't get it working either.

Angle and Strain Measurement

Hey Guys,
I'm a LabView newbie and want to program a LabView-VI which should write the measurement of a Heidenhaim angle measurement device and multiple strain gauge strips in one data file like this:
angle | strain1 | strain2 | strain3 ...
The strian gauge strips are connected to the Laptop with NI9237 modules and a NI chassis via USB. The Heidenhaim system is also connected via USB.
Can LabView identify the angle measurement system or do I need additional drivers?
I found this post (http://forums.ni.com/t5/Instrument-Control-GPIB-Serial/Heidenhain-ND-287-connect-with-VISA/td-p/2372... and tried to figure out the given example "Advanced Serial Write and Read.vi". But I would be happy if anybody has more information, examples, codes, etc.
Thanks for your help

Hi,
here is an example to measure the angle with a Heidenhaim device :
http://forums.ni.com/t5/LabVIEW/Angle-Measurement-Using-Absolute-Encoder-and-LabVIEW-FPGA/td-p/14114...
Aurelie

Dynamic strain measurement

Sir,
My experiment involves the measurement of strain on the specimen on the application of torque.
I'm using SC-2043SG for the quarter bridge ,with an internal excitation of 4.13V.
The problem is that when i apply 1.5 Nm and 2Nm torque, both are showing the same strain, 243 microstrain.
Whereas in the digital multimeter they show .7mV and .9mV respectively.
The strain is supposed to vary , which is not happening for every 0.5Nm. The multimeter is showing a
variation of .1mV for every 0.5Nm increase in torque. But this is not being shown in the strain output. Only
when it reaches 3Nm it shows 486 Nm. But this remains the same even for 4Nm.
external signal conditioning is also not helping.

thanks for replying ,
The DAQ device i m using is PCI -MIO-16E4
The DAQmx Device driver version is 7.5 0f 1
im attaching the program i made for my application.kindly see through it
thanks a lot
Attachments:
indu new.vi ‏131 KB

Strain measurement with nı 9235

hello everyone
I am user of NI 9235 and my question is about measurement of strain gages. I attached the gages to material propertly and connect to nı9235 with embeded gage factor and ets. then I calibrate just with using button of calibration as attached pictures. I am not sure am I measure right data. I checked NI website, there is something mention about shunt calibration but it doesnt offered at NI9235.
Could anyone give some information about my problem?
Attachments:
IMG_20150323_121018.jpg ‏5751 KB
IMG_20150323_121005.jpg ‏5594 KB

Hi,
Here is a National Instruments white paper http://www.ni.com/tutorial/7130/en/ that walks you through taking a strain gauge measurement. This should assist you in setting up your measurememnt. What about the data makes you think it is not measuring correctly?
I have found some other resources that may prove helpful http://www.ni.com/white-paper/11488/en/
http://forums.ni.com/t5/Signal-Conditioning/shunt-calibration-NI-9235/m-p/2460276
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I am currently trying to create a LabVIEW program for the night 3214 that measures and detects strain placed on an object for my senior design project. The order has been placed for the node and while my group waits for it to arrive we are trying to set up the code using the simulated components provided in the LabVIEW wsn module. using the example program provided in the manual for the node I have questions on how to set up a data base for logging data, as well as how to set strain limits for the node so that the warning system will go off.
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Westbury,
I would suggest posting this to the Wireless Sensor Networks forum over at http://forums.ni.com/t5/Wireless-Sensor-Networks/bd-p/430
The people who view that forum are much more likely to be able to help.
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The values reported are slightly different than the commanded value. Which of these is the most accurate value of the actual voltage?
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Greetings Rich,
Using the SCXI channel strings will actually read back the excitation voltages using the A/D of the DAQ device cabled to the SCXI chassis. Using the AI Paramenter VI to get the excitation value will just read the NI-DAQ configuration file and return what you set the excitation value to within MAX or LabVIEW. So the AI Parameter VI should just be used to ensure that the excitation was set (this isn't actually reading the excitation voltages using the A/D of the DAQ device).
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Using the "1520/1314", my strain readings are erratic, why?

I am using the SCXI 1520/1314 for measuring strain. When I put a load on the gauge, the readings are very erratic. How do I correct this?

I am using a SCXI 1000 chasis Rev 2.0 and the 1520 is Rev 1.1. I have not done a lot of strain measurement tests but this data does not look right. It may not be noise as the data is not random. I have attached a test we did.
Attachments:
coupon_Test.xls ‏131 KB

1520 Strain Measurement

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