Ni 9237 calibration -200077

I'm trying to calibrate NI 9237 + NI 9945 quarter bridge strain gage in ni max.
I get Error -200077 occurred at strain gage calibration.
Possible reasons:
Requested value is not a supported value for his property,
Property AI.Min
Requested value -1.0e-3
Valid values begin wih 18.8988984e-6
Valid values end with 103.843984e-3
Channel name: strain
I tried everything, different strain gages, different 9945's different 9237's, different cables, different computers. everything.
I changed every setting I could find in ni max.
I searched forums and inernet and what is there is not helping.
Any ideas? Please? I'm so desperate.
Solved!
Go to Solution.

I just got the same error message over and over.
What went down: When I set my min limit within the highest and lowest allowable values specified in the error dialog window, and then tried again, I got the same error all over again, but the highest and lowest allowable values shown in the window had changed to completely different numbers. This happened several times. No matter what I set my limits to, the max min allowable values would always change, so it would error out every time regardless of what I entered. Sometimes it would complain about the shunt calibration gain factor, that it couldn't set it to either "+inf" or "-inf". Looking closely at the calibration window, I noticed that NI MAX was reading the same strain value, both with, and without, the shunt resistor connected. When the calibraion subtracted Y2 - Y1, it got zero, and the inverse of zero is infinty. That's when I knew for sure it was something in my wiring and started looking into it more deeply.
Cause: Short in the lead wires running to the strain gage. When the specimen was assembled and bolted onto the fixture, the wires were obscured so that noone could see them, and they were crushed between two metal components.
Solution: Check for shorts or other issues in the strain gage wiring itself. I imagine if the strain gage circuit is open, then we would probably see the same error from NI MAX in that case as well.
Recommendation: I would request NI to add some more helpful information in the error dialog box, to suggest to the user to check wiring, etc.

Similar Messages

CRIO NI 9237 calibration

Dear,
I have a torque to measure.
I would like more documentation on the calibration.
How to used the calibration of the NI 9237? (The LSB weight and the offset)
When I connect the calibration value in the VI "Binary to nominal.vi". But the result is like nul (1.10e-6).
Regards
Massif

Massif,
If you are using LV 8.5.1 you can install NI RIO 2.4 and get calibrated values right our of you FPGA read IO node in terms of Volts/Volt
See:
http://digital.ni.com/public.nsf/allkb/C18C172029D187CA8625741600664D89
If your using the calibrated values, then you no longer need to use the LSB and Offset values. (much nicer)
SteveA
CLD
FPGA/RT/PDA/TP/DSC

9237 with full-bridge load cell: load cell_null_off_shuntcal.vi throws error 200077

Hi,
I'm trying to use the example
load_cell_null_off_shuntcal.vi with a full-bridge load cell (Honeywell
Model 31, unamplified). I am using LabView 8.6, cDAQ-9172 and NI9237. The
load cell is connected to pins 2,3,6 and 7.
The inputs for the VI front panel
are: internal excitation10V; mV/V 2.1492 (calibration sheet); max weight 10
lbs; bridge resistance 350 ohms (Honeywell specs); 9237 internal shunt
resistance 100 kohms; shunt location R4 (default setting). I have selected
"Do offset null" and "Do shunt cal".
This is the error I receive:
Error -200077 occurred at DAQmx
Perform Shunt Calibration (Bridge).vi:1 Possible reason(s):
Measurements: Requested value is not
a supported value for this property.
Property:
AI.Bridge.ShuntCal.GainAdjust
You Have Requested: -61.980405e3
Valid Values Begin with: 500.0e-3
Valid Values End with: 1.500000
If the "Do shunt cal"
green button is not selected, there is no error. I understand that the Gain
adjust value should be approx 1, whereas the one I get is much larger. The subVI DAQmx PerformShuntCalibration
(bridge).vi contains a "Call library function node" which I don't
know how to interrogate.
Has anyone else had experience
with this error? Do you have any advice on:
1)
How to "see" the calculations being
perfomed inside the "call library function node"?
2)
What the correct shunt element
location for a full bridge load cell is? (although changing this location does
not eliminate the error, I can't find this info).
3)
Anything I may be doing wrong with
my inputs to cause this error?
Thanks,
Claire.
Solved!
Go to Solution.

Hi Claire,
You have to physically connect the SC terminals to one arm of the bridge (normally R3). The terminal is not provided for connecting external resistors.
See example
C:\Program Files\National Instruments\LabVIEW 8.6\examples\DAQmx\Analog In\Measure Strain.llb\Cont Acq Strain Samples (with Calibration) - NI 9237.vi
"A VI inside a Class is worth hundreds in the bush"
യവന്‍ പുലിയാണു കേട്ടാ!!!

9237 + full-bridge load cell: load cell_null_off_shuntcal.vi - error 200077

I'm trying to use
load_cell_null_off_shuntcal.vi with load cell (Honeywell Model 31,
unamplified). I am using LabView 8.6, cDAQ-9172 and NI9237. Inputs:
internal excitation10V; mV/V 2.1492 (calib. sheet); max weight 10 lbs; bridge
resistance 350 ohms (Honeywell specs); 9237 internal shunt resistance 100
kohms; shunt location R4 (default setting). Have selected "Do offset
null" and "Do shunt cal".
Error -200077 occurred at DAQmx
Perform Shunt Calibration
(Bridge).vi:1 Possible reason(s):
Measurements: Requested value is not
a supported value for
this property.
Property:
AI.Bridge.ShuntCal.GainAdjust
You Have Requested: -61.980405e3
Valid Values Begin with: 500.0e-3
Valid Values End with: 1.500000
If "Do shunt cal" green
button not selected, no error. Gain adjust should be approx 1. subVI
DAQmx PerformShuntCalibration (bridge).vi contains "Call library function
node" which is locked (?).
Any ideas?
What is the correct shunt element
location for a full bridge load cell? Changing this location does not eliminate
error.
Solved!
Go to Solution.

Hello CFJ,
The problem is most likely in your external connections of the NI 9237 and the load cell. As referenced in the NI 9237 Operating Instructions and Specifications, page 9, the SC+ and SC- pins should be connected across the resistor specified in the DAQmx Perform Shunt Calibration (Bridge).vi (in the case of a full bridge it would be R3).
Let me know if you are still having issues with your calibration.
Message Edited by Dan_K on 01-22-2009 04:31 PM
Regards,
Dan King

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

Does the cRIO Scan Engine Support Offset and Shunt Calibration on the 9237 module

Thanks.

Sachsm,
The documentation for the Set Shunt Calibration (Scan Interface).vi should have been in the VI help but it looks like it didn't make it so I'll make sure it gets updated. I'll double check my understanding tomorrow morning but the documentation should be the following for the inputs of this VI:
slot - Specifies the chassis slot of the strain module (9237, 9235, 9236 ). Valid values are 1 through N, where N is the number of slots in the chassis.
channel - Specifies the channel to be affected. Valid values are 0-N where N is the channel for shunt calibration.
value - Turns Shunt calibration on or off. Valid values are 0 or 1 where a value of 1 will turn shunt calibration on for the given slot and channel.
Now, for your orginal question about offsets on the AI inputs, here are my addtional thoughts:
Unlike our SCXI products, the NI 9237 does not have an internal hardware nulling circuitry because its input range is sufficiently wide so that the inputs will not saturate even with a very large initial bridge offset. Since the 9237 does not have any hardware nulling circuitry, you have to perform offset nulling with software compenstation, and save the value to use later in the application as you mentioned. For example, when an offset null is performed in DAQmx, the entire offset is stored in the Initial Bridge Voltage property and is stored in software. You should see the same offset if you used the module from DAQmx, FPGA Interface, or in the Scan Interface. With that being said, I believe what your seeing is really just the resting measurement of the module and transducer together and you should be able to zero out your measurement by performing Software Compensation.
Regarding, Offset Calibration, I think its important to make clear exactly what it is providing as the name is a little misleading. The Offset Cal feature of the 9237 is really more like an Auto Zero used for eliminating offsets generated by an amplifier stage and doesn't provide the same behavior as offset nulling. In Auto Zero Mode, the 9237 shorts the input channel to ground and subtracts the obtained measurement from all subsequent samples. Performing an auto zero is a quick calibration technique that takes place at the beginning of a scan. A typical use of the Offset calibration feature would be to set it true at the begining of acquiring data and then leaving it on indefinitely.
Personally, I do not bother enabling offset cal in my FPGA applications because the measurement of the sensor at rest takes into account all sensor and module offsets.
And finally, if your looking for some information on how to perform shunt calibration, I like to refer to the example VI located here:
C:\Program Files\National Instruments\LabVIEW 8.6\examples\CompactRIO\Module Specific\NI 9235\NI 9235 Getting Started
As it has walks through the programming steps of setting up Shunt cal and applying the Gain Factors. Its written for LabVIEW FPGA but it should be easy to use with Scan Interface.
Hope that helps a little bit,
Let me know if you have questions and I'll help where I can or bug the right engineer.
Basset Hound

Null offset from calibration not being applied to output

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

Hello IamRubber,
How can you see the calibration not being applied? Are you running the same DAQ Assistant to see the offset? If possible, please attach a screenshot from before/after running bridge calibration.
Patrick W.
Applications Engineer
National Instruments

NI 9237 External Excitation - VeriStand 2013 SP1

The recommended excitation voltage for my pressure transducers is + 10 VDC. I prefer to use external excitation as per the NI 9237 manual, total power for the module is limited to 150 mW, which in my case is "Four 350 ohm full bridges at 3.3 V". (I will be using (4) full bridge 350 ohm pressure transducers). I am using Scan Engine for EtherCat and have the NI 9237 in a NI 9144 Chassis connected to a cRIO-9081. For troubleshooting, I have two transducers on a pressure calibrator and another RJ50 connection to a NI 9949 breakout. If I select "External Excitation" and have my 10 V power supply connected to the lower EX+, EX- connector, I get an invalid value for my pressure transducer. This is after scaling the value in calibration. The Raw Value is also incorrect. If I leave it set to "External Excitation" but pull the EX+, EX- connector, the EX+, EX- voltage (pins 6 & 7) will go to 4.735 V and I will get a CORRECT pressure reading. If I select Internal Excitation of 3.3V, I will get a correct pressure reading, but I am a little concerned about resolution as the recommended excitation is + 10 VDC for the pressure transducers. My question is: why am I unable to use the external excitation? I have another application with a PXI and EtherCAT chassis and it works OK. I've also tried placing a NI 9237 module in the cRIO-9081 chassis and get the same invalid value that I describe above.
Solved!
Go to Solution.

Do you have the latest version of the Scan Engine and EtherCAT custom device? On the community page for this custom device, the latest bug fix listed specifically refers to this module. Also there is a specific forum for this custom device that it may be a good idea to post on as well if you have not already posted there about this problem.
Miles G.
National Instruments
Applications Engineer

NI 9237

Please help us with to setup NI 9237 and NI 9411 with NI cDAQ-9174 to measure the load, torque and angle at the same time. We are using RJ 50 for the connection between load and torque sensors to NI 9237.
For the Load cell, we wired positive and negaitve signals and exicitation pins. it is not reading properly....
Questions:
1. Exitation Voltage for the load call is 10V, do we need an external supply?
2. Do we have to attach the Shunt Calibration pins?
3. attaching the specification sheet for Load cell and torque sensors. Please explain.
Attachments:
sesnors.pdf ‏185 KB

Hi Kwindsor,
1. The NI 9237 can supply up to 10 V of excitation internally, so you shouldn't need an external supply.
2. You shouldn't need to connect the shunt callibration
Synchronize 9401 and 9237 Measurements will give you a good idea how to synchronize these measurements. The example is use a count edges task, but you can change this to an angular encoder task for your application. Can you get any measurements on your 9237 at all? This KnowledgeBase article will tell you how to configure this load cell measurement in Measurement and Automation Explorer to test the readings from your load cell.
Regards,
Jim Schwartz

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.
Can anyone help me please?
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,

Create VTEDS using 9237 + HBM U93 Bridge Sensor

Hi LabView Community!
I'm using LabView 2010 for a short time now, especially trying to set up a monitoring solution for some machines in automotive bodyshop.
My problem is following, i will use TEDS Sensors to make the calibration first (on a own calibration stand) with LabView, to use this in production lines. So i got different sensors, especially for now a HBM U93 5kN Bridge Sensor (Full Bridge 350 Ohms, 0,5mV/V), which got a "Hardware TEDS" in form of a DS2433 EEPROM, but it is build in 1-wire technic, where i got no access with my 9237 Bridge module (works only in 2 wire or Class 2 technic).
In general, i understand how LabView works with TEDS, i can create VTEDS files, read them and use them to set up a measurement-task. For later i'll use this VTEDS files to write them (if any hardware from NI, or i use other) on the sensors EEPROM.
But to calibrate the sensors, i don't understand, how i get the measured electrical values (AI+ / AI-) out of my 9237. I can use and i use the MAX explorer to calibrate the "null" value of the sensor, but where can i access the electrical value at this point (or the divided Value of , to write it in my TEDS file for my 0 N value? The same problem is to calibrate it with a physical, known force (with a reference sensor), i can't find the place where i can get the electrical value out of the 9237. Shunt calibration doesn't work anyway, i tried here all things that were described in forums or somewhere else from NI. I tried always the "calibration table", but until now i didn't correctly understand how this one is to use in the right way.
It would be very helpful for me, if i'd know, where the electrical or representative values are accessible to calibrate the sensors!
thank you very much!
regards, Dennis

Hi,
This could maybe help you:
Continuous Wheatstone Bridge Measurements with Calibration - NI 9237
https://decibel.ni.com/content/docs/DOC-12258
Regards
Florian Abry
Application Engineer Group Leader
NI Germany

Gain error with shunt calibration

Hello,
I have a problem with shunt calibration of bridge based displacement transducers. The shunt calibration routine sets gain factors that give errors around 2% in the measured displacement. I have also found that the shunt calibration gain factors run out of bounds without a preceding offset null.
The hardware is a cDAQ-9188 with 9237 modules. The gauges have four wires, two input wires that I have connected to EX+ with jumper to RS+ and EX- with jumper to RS-/SC-, and two output wires that I have connected to AI+ with jumper to SC+ and AI-. LabVIEW is used with a VI shown in the attached figure.
Does anyone know why the shunt calibration behaves like that or what I do wrong?
/Emil
Attachments:
labview.png ‏19 KB

Hi Anton,
Setting the gain manually from a known displacement is not an option as some of the transducers are mounted so that they cannot be tested with gauge blocks.
Setting the DAQ Assistant Express VI or Create Channel VI to strain mode gives the same shunt factors as the general bridge mode.
I have done additional measurements to outrule any chance of coincidence with the sensing wires. With jumpers from EX+ to RS+ and from EX- to RS- on the first four of ten transducers the shunt factors are:
1.0046; 1.0246; 1.0347; 1.0246; 0.9649; 0.9811; 0.9600; 0.9720; 0.9591; 0.9793
with jumpers only on the first two transducers the shunt factors are:
1.0044; 1.0247; 0.9867; 0.9729; 0.9648; 0.9811; 0.9599; 0.9721; 0.9589; 0.9791
and finally for all transducers without jumpers the factors are:
0.9624; 0.9715; 0.9868; 0.9728; 0.9647; 0.9809; 0.9600; 0.9721; 0.9592; 0.9792
The conclusion is that the shunt factors are wrong but stable if the wiring is unchanged. Jumpers between EX and RS terminals effects the shunt factors. The shunt factors are between 0.04 and 0.06 larger with jumpers.
Should the RS terminals be connected for gauges without an extra sensing wire? Should there be a difference with and without the jumpers? Do you suggest anything special to look into regarding the EX wiring?
/Emil

Shunt Calibration Failed

Hello! I'm pretty new to LabVIEW so I apoligize if I am confusing.
I'm trying to put together a VI that will take the strain measurements from four gauges, initially based off of the example provided through the "Strain - Continuous Input.vi". I'm using a cDAQ-9147 equiped with a NI 9237 and a NI 9944. Since our system won't be changing I wanted to set the Shunt resistor value and location as constants (100,000 ohm and R3, respectively). Unfortunately when I then try to run the VI with "Enable Shunt Cal" on I get an error::
"Error -201493 occurred at DAQmx Perform Shunt Calibration (Strain).vi:5630001
Possible reason(s):
Shunt calibration failed. The calculated gain adjust is out of range. Ensure that the shunt calibration terminals are connected properly and that the shunt resistance and shunt element location settings match how the hardware is wired.
Property: AI.Bridge.ShuntCal.ShuntCalAResistance
Corresponding Value: 100.0e3
Simulated Value with Shunt: 1.750000e-3
Measured Value with Shunt: 603.757856e-6
Property: AI.Bridge.ShuntCal.GainAdjust
Requested Value: 2.898513
Possible Values: 500.0e-3 to 1.500000
Channel Name: Axial 2
Task Name: _unnamedTask<A>"
I should note that the original example works on all gauges, so I know it's a mistake I've made somewhere. I've included the VI if that will help.
Thank you!
Attachments:
Strain_HELP.vi ‏98 KB

Hi Sunkistist,
This error can be caused by one of 3 things:
Your 9237 is so far out of calibration that the gain adjustment it would take to correct it is higher than the maximum supported by shunt calibration. Since the shipping example works, and your confident with the readings, we can assume this is not the case.
Improper physical connections. Again, we can rule this out for the same reasons as #1.
Improper configuration. Check to ensure the all the bridge resistance and strain gauge information is correct.
Here are some links you might find helpful:
Shunt Calibration with NI-DAQmx
Connecting Strain Gauges and Shunt Resistors to the NI 9237
NI 9945 or NI 9944 with an NI 9237 Connection Guide
Jeff Munn
Applications Engineer
National Instruments

Shunt calibration CDAQ

Hi:
I’m using C-DAQ NI 9237 module with Signal Express and I have the following doubts: 1) How can I perform a shunt calibration using a ¼ Wheatstone bridge? I’m using module NI 9945 and I don’t have any way to perform the shunt.2) Concerning the half and full Wheatstone bridge the shunt calibration is possible using module NI 9949. Is the precision resistor of 100kOhm internal to the module? Can I connect an external precision resistor to pins 1 and 10 of the module? 3) If the precision resistor is internal how can I activate the resistor? I suppose that is just short-cut pin 1 to pin 10. Is that right? Regards, Diogo Ribeiro.

Hi Diogo,
Thanks for posting! To answer your questions:
The
100 kOhm shunt resistor is internal on the 9237 (connected to a switch across pins 1 and
10). The 9945 accessory performs the 1/4 bridge completion and the
circuit containing the shunt resistor is wired across R3 internally.
Running the calibration in Signal Express will automatically
connect/disconnect the shunt as necessary.
To perform the shunt
calibration on the 9949, you would use jumper cables to connect the Shunt Calibration
pins (1 and 10) across the desired resistor (you can specify the resistor used in software).
Again, the driver will automatically connect and disconnect the shunt resistor during the calibration process. You can provide
your own external shunt resistor on the 9949, but you would have to
make the measurements and scale the data yourself in software. I would recommend that you let the driver handle this.
I hope this answers your questions, if you have any others please let me know.
-John
John Passiak

Mid 2010 15" i5 Battery Calibration Questions

Hi, I have a mid 2010 15" MacBook Pro 2.4GHz i5.
Question 1: I didn't calibrate my battery when I first got my MacBook Pro (it didn't say in the manual that I had to). I've had it for about a month and am doing a calibration today, is that okay? I hope I haven't damaged my battery? The calibration is only to help the battery meter provide an accurate reading of how much life it has remaining, right?
Question 2: After reading Apple's calibration guide, I decided to set the MacBook Pro to never go to sleep (in Energy Saver System Preference) and leave it on overnight so it would run out of power and go to sleep, then I'd leave it in that state for at least 5 hours before charging it. When I woke up, the light on the front wasn't illuminated. It usually pulsates when in Sleep. Expectedly, it wouldn't wake when pressing buttons on the keyboard. So, what's happened? Is this Safe Sleep? I didn't see any "Your Mac is on reserve battery and will shut down" dialogues or anything similar, as I was asleep! I've left it in this state while I'm at work and will charge it this afternoon. Was my described method okay for calibration or should I have done something different?
Question 3: Does it matter how quickly you drain your battery when doing a calibration? i.e is it okay to drain it quickly (by running HD video, Photo Booth with effects etc) or slowly (by leaving it idle or running light apps)?
Thanks.
Message was edited by: Fresh J

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

Ni 9237 calibration -200077

Similar Messages

Maybe you are looking for