How do I connect 16 strain gauges in quarter bridge arrangement to a SCXI 1322 connecter block?

Specifically, do I connect 4 bridge completion resistors to each VEX- channel or do I need to wire them together somehow first?

I have attached a bitmap image that explains how to wire a quarter-bridge strain gauge to the SCXI-1122 (with 1322 terminal block.) The 1122 only provides half-bridge completion, so you have to wire an extra resistor into the circuit to complete the bridge.
You can find this image in the SCXI-1122 User Manual, which is available for download at:
http://search.ni.com/search/query.html?col=alldocs&qp=%2Bcontenttype%3Aproductmanual&lk=2&layout=ProductManual&qt=1122
Attachments:
1122_strain.bmp ‏920 KB

Similar Messages

My strain gauges (full Wheatstone bridge) give me a constant negative voltage

Hi, I'm currently trying to calibrate strain gauges to work with a one-axis tribometer...I'm using XP, LabVIEW 8.5.1, have the latest version of NIDAQmx and SignalExpress 2.5.1. Right now the strain gauges are hooked up to a SC-2043-SG signal conditioning board, which in turn is hooked up to a PCI 6251.
The problem right now is that while the computer recognizes the device and is getting output from it, I'm getting a constant negative voltage (-10.2 V or something like that). My configuration for the SC-2043-SG is as follows:
Custom voltage w/ excitation
-External excitation (can't switch to internal excitation source- apparently it doesn't exist even though I've set the switch on the board to INT)
-Full Wheatstone bridge
-Differential terminal configuration
-Not using ex for scaling
-Ex value is 1m
-Channel is ai0
I've currently got this set up in SignalExpress 2.5.1 and have been generating VIs from the task that I've made there.
Another odd thing is that the gauges don't seem to respond to when I put pressure on them.
So what I mainly need to know is
1) Do I have bad gauges?
2) Do I have an incorrect configuration?
I guess on a side note I've noticed that when I set the terminal configuration to RSE, the values oscillate around 0.08V. Should I use that instead and calibrate it from there, so that at least the configuration reads 0 by default?

Hi balaclava,
Since the SC-2043-SG is an older signal conditioning board
is does not support programmatic control of its excitation or settings. This is
why there is no internal excitation available to select in your DAQmx task. These
setting must be configured on the SC-2043-SG using the on-board jumpers.
You will want to set the jumpers for internal power and
excitation and set for full bridge gauges. More information on all of the
jumper settings can be found in the SC-2043-SG User Manual. Also page 30 of the
manual shows how to connect a full bridge sensor.
Once you have the SC-2043-SG configured correctly it then
does the bridge signal conditioning and provides the DAQ card with a voltage signal
referenced to AI Sense. You can measure this signal using a normal analog input
voltage task with the terminal configuration set to NRSE or RSE. It does not
provide the DAQ card with a differential signal.
Please let me know if you have any questions and take care.
Thanks,
Nathan
National Instruments
Digital Hardware Engineer

What device I have to connect with my PCI - 4351 to mesure a strain gauge signal?

Hi,
I have a PCI - 4351 with a TBX-68T messuring some termocouples signals, but I want to mesure a strain gauge too, what devices I have to connect my PCI - 4351 to make it possible?
Thanks.
Rafael.
U.F.R.J. Engineering student.
Brazil.

Q: what do i have to do to connect my devices to my jetpack??
A: Jetpacks are wireless only devices. You need to open up your computers wireless network list and select the network being broadcasted by the Jetpack. Once you find the network then connect to it by entering the WiFi password provided on the back of the Jetpack.
Q: what's the phone # for ???
A: VZW is a phone company. Every device that connects to the VZW network has a phone number associated with it that allows it to dial in. Although your Jetpack uses a phone number there is no need for you to have to enter or use it on anything other than for billing purposes.
Q: it appears that my tablet has already picked up the jetpack as a connection. is that it ???
Yes. The Jetpack should be broadcasting some kind of unique network name. The default network name (SSID)should be on a white sticker on the back of the Jetpack.
Q: I have another device at a different location. how do I get that device connected to the jetpack ??
A: Jetpacks have a very limited range. You need to bring your devices within the wireless radius of the Jetpack in order for them to connect to it. Normally a jetpack can only reach 1 room away from its current position, they are not as powerful as a normal home wireless router.

How to measure voltage changes using a NI-9219 with strain gauges and use the data in labview

I am updating an old LabView/Data Acquisition system that uses strain gauges to measure two forces (normal and axial) as well as two moments (Pitch and Roll). I am having trouble reading the voltage changes over my strain gauges using my NI-9219 as well as filtering the data with both a lowpass and smoothing filter. The program attached has the project and should have all the sub-vi's used in the program. This program was written on LabView version 8.5 and is being updated to a 2013 version of LabView. Also, the hardware previously used was a combination of a NI SCB-68 and NI USB-6251. If anyone could help me it would be greatly appreciated!
Attachments:
New SSWT.zip ‏751 KB

Hi Coffeyfj,
Did you ever had this set up working? The first thing that I would do as I mentioned in the previous comment would be to use one of the LabVIEW examples. I recommended to you using the (strain - Continuous Input.vi). If you can read any voltage changes with the example vi, then we will know the problem we are having is in your code. If you cannot read any voltage changes using the example I mentioned, we can start trouble shooting the hardware connections. Are you connecting the excitation voltage? If yes, Are you making the right connections. Please refer to page 19 of the following document (half and full bridge modes)
NI 9219 Operating Instructions and Specifications - February 2009
http://digital.ni.com/manuals.nsf/websearch/4197ED4BD126E0B486257546005851CA
Regards,
William Fernandez
Applications Engineer
National Instruments

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

Error 200077 during Strain Gauge Calibration in Measurement and Automation Explorer V5.3.1f0

Hey Guyz!
I am experiencing a problem perfomring my shunt calibration using a 350ohm(GF 2) strain gauge connected with NI9949 and NI9237 in a NI cDAQ-9178 Hardware.
When i click on strain callibration under configuration-Device: R3 being my shunt of 100k ohm, i can measure the errors and calibration but when i hit the calibration tab, it gives me an error 200077 occured at Strain Gauge Calibration (see aatached jpeg file for the error type).
I don't know what is wrong, i have doublt-tripple checked my circuit, and have read the forums regarding the same error and have come across the "signal input range", in my case it is default kept at 1m max and -1m min. I am not sure how these values work.
Any guidance would be appreciated.
Thanks in advance.
Attachments:
error 200077.jpg ‏73 KB

Hi
This error code may be occurring due to the specified signal input range in max (-1m to 1m), being set to a value outside of the expected readings from your strain gauge.
Also the Gage Factor, Gage Resistance, Initial Voltage, Vex Source, Vex Value (V), Lead Resistance and Strain Configuration need to be configured based on your sensor specification.
This link gives more details on connecting strain gages to a DAQ device:
http://www.ni.com/gettingstarted/setuphardware/dataacquisition/straingages.htm#StrainGageCalibration
Hope this helps.
Andrew.N
Applications Engineer
National Instruments

Can I measure Vibrating Wire Strain Gauges using Field Point Inputs?

Is wish to connect a Vibrating Wire Strain Gauge using Field Point.
The sensor requires a swept frequency excitation (typically 400 to 1500 Hz) and then generates a frequency output proportional to the strain applied on the vibrating element. The frequency (roughly upto 1kHz) needs to be measured.

What sort of resolution is needed on the frequency sweeping? There are currently four FieldPoint modules that can be used for generating pulsed outputs; the FP-CTR-500, FP-CTR-502, FP-PWM-520 and FP-PG-522. For the remained of this posting, I will use FP-CTR-50X to represent both the FP-CTR-500 and FP-CTR-502 as they are identical in functionality, different in their input/output stages.
The FP-PWM-520 is a Pulse Width Modulation output with 12 bit resolution on duty cycle and 16 bit resolution on the pulse period. The period is adjustable from 1 to 655535 milliseconds, which makes the module slightly less than ideal for frequency sweeping as it's highest frequency is 1 kHz and it's second highest frequency is 500 Hz.
The FP-PG-522 is a Pulse Generator module that can operate in an continuous pulse mode. The On Time, Off Time and resolution (time base) are adjustable. The smallest time base is 100 ms, for a maximum output frequency of 5 kHz. Like the FP-PWM-520, the FP-PG-522 adjusts it's output rates by changing the time rather than the frequncy, making it difficult to smoothly sweep across frequencies.
Finally, the FP-CTR-50X modules may be used. The FP-CTR-50X modules have 8 16 bit counters, 4 Gates and 4 outputs. The module has two internal clocks, 1 kHz ad 32 kHz that can be used to feed the counters. The outputs can be configured to toggle each time an adjustable terminal count is reached, allowing output pulse generation of up to 16 kHz (32 kHz internal clock divided by 2). The FP-CTR-50X modules have the advantage over the above modules in that the counters can be cascaded and set for differing terminal counts allowing multiple pre-scalers which may allow better resolution of generated frequncies.
For measuring the output frequency generated by the gauge, the only current modules that will allow you to directly measure the output are the FP-CTR-50X modules. However, as they were primarily designed for event counting, it takes a little bit of extra programming to allow them to be used to measure frequencies. The effectiveness of frequency measurement on the FP-CTR-50X modules varies on the sampling period, the programming and the network module. There are several KnowledgeBase and Developer Exchange articles talking about how to use a FP-CTR-50X module to measure frequencies, so I will not duplicate the information in this post.
Regards,
Aaron

Measuring strain gauge by using DAQ6251

HI everyone
i hope that i will find someone who can help me at this point.
i am new at labview and DAQ i cant buy new input module specified to strain gauge measurment becouse of it is high cost how can i use my DAQ6251 to measure strain gauge i have instumentation amp AD624 and i hand made whetestone bridge and i have problem at calibrate the strain gauge i dont know i dont know what can i do to calibrate the strain guage and what is the most important values and how can i caculate it .
thanks alot
M.Shawky
Attachments:
Connecting Strain Gages to a DAQ Device - National Instruments.pdf ‏707 KB
AD624.pdf ‏599 KB

In the future, you should post this to multifunction DAQ. The 6251 is not an academic product and you'll get a different set of eyes as a result.
When you follow the pdf you posted, what happens? It has a step by step process. Where are you getting stuck?

Using the convert strain gauge reading vi

I am having difficulty with wiring the convert strain gauge reading vi. Are there any examples of this vi showing how to connect it?
thanks
HS
Solved!
Go to Solution.

Have you consulted the help file on it?
http://zone.ni.com/reference/en-XX/help/371361G-01/lvinstio/conv_strain_read/
There don't appear to be any stock examples using it, but the help files for these VIs can be VERY helpful.

Setting up DAQ system for testing (using pressure transducer, linear position sensor and strain gauges)

Hello,
I like to get your suggestion in setting up the DAQ system. I am very beginner in this issue.
These SCXI listed below are what we have in the laboratory. I will use DAQ card 6062E.
SCXI 1000
SCXI 1520
SCXI 1140
SCXI 1142
SCXI 1305 , 1302 , 1300
SCXI 1122
SCXI 1100
I will use linear position sensor in my experiment. But I'm not sure which SCXI shoud I connect to this sensor.
This sensor gives 4-20mA output. it requires +13 to +28Vdc excitation.
I will use pressure transducer (strain gauge type) which gives 100mV output and requires 10Vdc supply.
I will use strain gauges 350 ohm.
Regarding to the number of channels used in my experiment, I will use 1 channel of pressure transducer, 1 channel of linear position sensor and 3 or 4 strain gauges.
Could you please suggest me which SCXI should be used with pressure transducer, linear position sensor and strain gauges.
Now I'm thinking to use SCXI 1520 with strain gauges and pressure transducer. Is that ok?
But I'm not so sure on the linear position sensor which gives current output.
And regarding to sampling rate, I like to get minimum of 60-70 KS/s for pressure transducer. And around 1KS/s for linear position sensor and 1KS/s for each channel of strain gauge are enough. Can I archieve these sampling rate from the available SCXI modules mentioned before? I attached the datasheet of pressure transducer and linear position sensor for you. Please see attached files.
I'm reallly look forward for your suggestion.
Thank you in advance,
Ganchai.
Attachments:
XPM6_mini. pr. transducer.pdf ‏115 KB
linear-position-sensor.pdf ‏1683 KB

Hi Ganchai,
I would recommend the 1520 with a 1314 terminal block for connecting your pressure transducer and strain gauge. It is designed for excitation, bridge completion and has many other features to fit these applications. For your linear position sensor, try using the 1100 module with an additional precision shunt resistor. For example, our 1308 terminal block has built in 249Ohm shunt resistors for taking current inputs for your 1100. These connections should give you the readings you would like.
As far as sampling rate goes, you should be fine with your requirements. Good luck and I hope you are succesful.
PBear
NI RF

I can not measure strain gauge

I'm trying to work for strain gauge measurement with scc-sg04, sc2345 signal conditioner and ni-6223 DAQ card. Internal +2.5V supply I have used as excitation voltage. I want to get the data via Measurement & Automation explorer and I have created a task for strain measurement. I have selected the SCC1Mod1/ai0 channel for this purpose and adjusted task timing to Continuous mode. When I have pushed the Test button, Analog Input Test Panel is shown and observed strain value is -0.0021. This value do not changes while I pushing my finger to the load cell.
With +2.5V excitation voltage can I see the any changes for output (note that manufacturer recommends 10V excitation voltage).
Message Edited by immortal on 11-12-2007 02:11 AM
Message Edited by immortal on 11-12-2007 02:12 AM
Attachments:
fig.JPG ‏89 KB

Dear Hani,
Thank you for your reply firstly.
I connect external power as you give but there is some problems I have encountered. I connect cables of DC voltage supply to input of the load cell (DC supply is not running) but acquired data (there should be only noise ideally in this state) is fluctuating (See q3_1.jpg). After, I run DC supply and there is a sinusoidal wave in this phase (See q3_2.jpg). If I push my finger to load cell, DC value of this sinusoid changes only. So, I have a big problem with my external excitation supply .
The other problem I've encountered is Vex value of external excitation. I change Vex source to external and Vex=10V and my task is not working and gives an error as "requested value is not supported value for this property" (See q3_3.jpg). I couldn't understand why this error occurs.
Waiting your reply...
Attachments:
q3_3.JPG ‏76 KB
q3_1.JPG ‏31 KB
q3_2.JPG ‏30 KB

Simulate strain gauge

Hi everyone, I am currently developing a data acquisition program to measure about 50 strain gauges simulatniously using LabVIEW version 8. At the moment I only have one strain gauge so I would like to simulate the others. I am using the DAQ-MX functions and I am connecting the strain gauges through seven SCXI-1520 cards mounted into a SCXI-1001 box. I don't always have access to the hardware, so I have simulated this hardware setup in MAX but I have been unable to simulate input signals into the simulated hardware to test out my LabVIEW program. I have tried using test panels within MAX to generate an input signal, but when I try to run my program it complains that 'the specific resource is reserved.' Can anyone help me out with this? Thanks in advance.
Message Edited by DarkMarc86 on 04-16-2009 12:19 AM

Hi Dark,
From the devzone article you linked to "Note: NI-DAQmx simulated devices create a noisy sine wave for all analog input channels. Configuration of other simulated data is not available at this time." This means when you're using a simulated device, you don't specify an input signal- you should be seeing a noisy sine wave on all channels. Also,you won't be able to use a test panel to the device and then read from it in LabVIEW at the same time.
aNItaB
Applications Engineer
National Instruments
Digital Multimeters

9237 Strain Gauge Measurement

My company purchased a Compact Rio with eight 9237 modules to do strain gauge measurement and I have to program cRio. Unfortunately I am very fresh in LabView and I don't know how to start. I have seen NI-9237-Getting Started-Scan Mode and cRio Embedded Data Logger examples, but first one is too poor. The second one would be perfect but require FPGA and we don't have it. I would be extremely thankful if someone could sent me some appropriate example or instruction how to do it. We have cRio 9022 and LabView 2010.
Tom

Hi, Tom!
I am glad to hear that you started to use LV.
Because you mentioned that you are new in LV, I would suggest you to read next few documents, that can be usefull for you.
Using NI CompactRIO Scan Mode with NI LabVIEW Software ( http://zone.ni.com/devzone/cda/tut/p/id/7338).
If you are interested in some advanced functions that you can use for programing in Scan mode, please take a look next documents:
How Do I Programmatically Set Module I/O Properties When Using CompactRIO Scan Mode? (http://digital.ni.com/public.nsf/allkb/37F5B88B83F4FAAE862577080082698E?OpenDocument) or
Programmatic Discovery, Configuration, and Access of CompactRIO Scan Mode I/O with LabVIEW (http://zone.ni.com/devzone/cda/tut/p/id/9351).
Example that you mentioned (NI-9237-Getting Started-Scan Mode) is made to be used at starting point. Idea is to add additional parts in this code to adjust program to your needs.
More advanced program, that you can find in Example finder is RIO IO Scan Embedded Data Logger.lvproj.
I think that you should start from NI 9237-Getting started-Scan Mode.lvproj (from Example finder). After you try it, you can add new features to it and adjust it to you needs.
Please let me know if you have extra questions.
Best regards,
Sofija Poledica

Use NI 9237 to Measure the Strain Gauge

I'm a newbie and I have no idea how to use NI 9237.
I'm trying to meaure the strain gauge with NI9237. I dropped down from .
The data type of is Double. I want to know is it the output (the difference of Al+ and Al-) of strain gauge? Or is it something else?
Thank you very much!

Please help!

System calibration of a cantilever with strain gauge atteched

I have written a vi to measure the number of chocolate bars (this is a second year engineering design project) using a cantilever with a strain gauge applied. Part of the calibration is to plot readings of applied loads. Is it possible to add to the vi to correct for this? ie change the reading to the applied load. If this is possible how do I do it?
Attachments:
Canteliever.vi ‏78 KB

If you are generating a curve that essentially shows the conversion between ounces (pounds?) of chocolate (load) and strain, you can use that data as a lookup table. What you need is a 1D array of strains and a 1D array of loads that correspond to the stain values in the other array.
Use the reading you are getting (in strain) to threshold the array of strain readings. The result is a fractional index where the value from the array below the index is less than the threshold value and the next value from the array above the index is greater than the threshold value. To come up with the fractional part of the index I believe the code does a linear fit between the two bounding points, but you should check that.
(By the way, an interesting feature of the thres
hold function is that unless the first value in the array being thresholded is less than the threshold value, it won't work... An error condition to check for...)
Now use this fractional index to interpolate the array of loads and you should have a weight close enough to tell how many candy bars are sitting on the dohickey.
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

How do I connect 16 strain gauges in quarter bridge arrangement to a SCXI 1322 connecter block?

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