Scc-sg24

Hi to everyone,
I'm using a SCC-68 connector with a scc-sg24 module to acquire a lod cell with this fetures:
-model FN3060
-Supply Voltage 10 Vdc
-F.S.Output 2mV/V
The problem is that the voltage value acquired in MAX is the same that I measure with multimeter as input of scc-sg24 module.
In the attached file you can see an example: the amplitude is about
1mV, but that I expect is 100mV if the gain og the module is 100.
Any suggestion about this problem ?
Thanks.
Bye
Attachments:
scc-sg244.JPG ‏134 KB

Sorry, I think is not the correct section of the forum.

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Bridge Offset Nulling Doesn't Seem to Work With SCC-SG24

Does anyone know if the DAQmx "Perform Bridge Offset Nulling Calibration" vi works with the SCC-SG24 modules? We have used our NI-9237 module in the past to acquire dual-channel load cell (thrust & torque) measurements, and calling that vi does a fine job of zeroing out the values before applying the load. However, it doesn't seem to work when we try to take the same measurements using an SCC-SG24 module.
We are able to zero the values manually, by using the nulling resistors and potentiometers in the SCC-SG24. But, whether the nulling resistors are installed or not, we are not able to zero the values using the "Perform Bridge Offset Nulling Calibration" vi. Running that vi does induce a significant offset in the values, but it is not the correct offset needed to bring the values to zero. For example, with no load applied, a torque reading before running the vi may be +1090 in-lbs, and be "zeroed" to -465 in-lbs after running the vi. Running the vi multiple times (to check repeatability) always brings us back to approximately -465 in-lbs.
An additional issue (not sure if it's related or not) is that if we try to run this vi to offset just one of the channels in the task (such as just thrust, but not torque) it will still induce a small offset in the other channel, which doesn't seem right.
I guess I'm not clear on whether the subject vi is performing an operation on the hardware, the software, or both, so I'm not sure whether the SCC-SG24 modules may not be compatible with this vi?
Thanks for any help you can provide.

Hello Dhruser1,
I think that the DAQmx Perform Bridge Offset Nulling Calibration should work for the SCC-SG24 module. Take a look at this article: Removing Large Initial Offset for Load Cell or Strain Measurements with SCXI-1520 or PXI-4220 in particular it mentions that using this VI in addition to the auto zero can introduce an offset. If you're doing both these is likely the cause.
Also, when you specify specific channels using the channels input are you also setting the "skip unsupported channels to false? If not this may be why it affects other channels.
I hope this helps, and if not please feel free to post back with an update after trying these things.
Cheers,
Brooks

SCC-SG24 & SCC68 (Torque transducer)

HW: PCI6229, SCC68, SCC-SG24, TRT-25 (Transducer techniques, torque transducer) using Virtual TEDS from ni.com
SW: LV 8.2.1, DAQmx 8.3
Hi guys, with the 'rig' above i'm trying to extract the torque of a motor.
Based on what i know, the SCC-SG24 will detect the small change of
voltage in the bridge of the transducer, amplify it can send it to my
DAQ through the SCC68 connector block. The TEDS data will be used to
properly scale my data so that i'll get an accurate Torque vs Sample
graph. I have attached the screenshot from MAX and it shows the
Amplitude vs Sample of my transducer. As you can see the values are
very small, in the mV range. I've tried changing the max/min input
limit to 200m/-200m but it doesn't allow me to do that. And how do i
convert this voltage measurement to torque?
Attachments:
SCC-SG24.JPG ‏125 KB

Hi Atma,
Doing and average of the signal coming from the torque transducer will help better understand what is happening because the torque transducer can be very sensitive and that is why your readings oscillates between -0.35 and -0.39. In the manual page 23 says that (in the picture) those are the offset nulling resistor for AIX.
If no strain is apply to the torque transducer then yes change the resistor until your signal is in average in 0. For the other three times it can be noise, it can be poor connections it will also depends on your torque transducer specs, this is a useful link for basics in torque measurements http://zone.ni.com/devzone/cda/ph/p/id/255, Another very good resource for strain measurements in general is http://zone.ni.com/devzone/cda/tut/p/id/3642 What are the values the other three times when it does not match the wrench? How those the images look when you apply strain? Let’s say you apply a know strain how does the measurement looks like?
JaimeF
Message Edited by Jaime F on 08-29-2007 03:54 PM
Jaime Hoffiz
National Instruments
Product Expert
Digital Multimeters and LCR Meters

Can I measure 2 differential channels on a single SCC-SG24?

I am trying to use a single SCC-SG24 module to excite and measure the
output of 2 pressure transducers. The module is installed in the
ACh2 position of an SC-2345 carrier. When I configure the module
through 'custom voltage with excitation' in MAX, I can set the terminal
configuration of ai2 to differential. However, the other channel of the
module, ai10, can only be set to RSE or NRSE; the other options are
greyed out. I want both channels to be set to differential. Can I
configure the SCC-SG24 to measure 2 differential channels on a single
SCC-SG24? Thanks.

Hi,
I did a little looking into the DataSheet
for SCC Modules, and I found the following schematic.
As you can see there 2 instrumentation amplifiers that make it to where your measurements
are really differential, and then mapped to the NRSE lines in the
SC-2345. If you were to set up the DAQ board for differential it would
simply read the difference between one pressure transducer and the next.
Long story short, you set up the DAQ board for NRSE for all of the channels,
the SCC-SG24 makes it to where you are really taking a differential
measurement. Everything works quite simply in the end.
Regards,
Message Edited by Otis on 10-11-2005 12:56 PM
Otis
Training and Certification
Product Support Engineer
National Instruments
Attachments:
728815-SCC-SG24_Channels.GIF ‏10 KB

SCC-2345 won't recognize the (2) SCC-SG24s I installed

SCC-2345 won't recognize the (2) SCC-SG24s I installed.
They don't show up as a MAX selection. They are installed
in J3 and J4. I've tried moving them to different slots with
but they still don't show up.
We have a 6052E card connected to the SCC-2345. We are
using Labview 7.0 Developer Suit. Operating system is Windows
2000.
The (2) SCC-SG04s we have installed do show up as a
selection and work well.
Can anyone point me toward a resolution to this problem?

Alan,
Thanks for your reponse, it was dead on.
After updating, the scc-sg24s now appear as a drop down selection but now
I have another problem. My PCI-6052 DAQ board now does not appear as
a selection to "add". Immediately after updating NI-DAQ I fired up MAX and
even though the scc-sg24 appeared as a selection, this selection, the
scc-2435, our pci-6052, and all other modules fitted to the pci-6052/scc-2435
appear with a red "X" next to them.
I renamed the existing <Data> directory and allowed MAX to recreate it but the
PCI-6052 appears ONLY as a legacy selection and can not be added/selected to
DAQmx.
I can add the scc-2345 DIRECTLY to DAQmx and also select all the modules
that we have loaded into it, but after I select <OK> I get an error message that I
haven't selected a digital interface
I'm assuming this is because I can't add the 2345(I have to add it directly to
DAQmx) to the 6052 because the 6052 doesn't show as an available option to be
added to DAQmx.
Do you know if there is other software or drivers I need to update?
Again, thanks for your help.
Art Cravener
Dana Corporation
Message Edited by anengineer on 10-12-2005 03:33 AM

Use of different sensors with scc-sg24

Hi,
in my application I've to use two type of sensors with following characteristics:
-a pressure sensor : 10V Ex V , input nominal 950 Ohm output nominal 300 Ohm
(what does it mean? I know that should be a 350ohm full bridge...)
-a load cel: 10V Ex V, 700Ohm full bridge
It is the SG24 able to read this kind of sensors?
Can I use a single SG24 module to read the two sensor using the two
channels at same time?
Thank you,
Pets
Solved!
Go to Solution.

Hi Pets,
by looking at the scc-sg 24 specifications at this link http://www.ni.com/pdf/manuals/371073b.pdf you
you can see that your module has a 10 V excitation which is the same amount required by your sensor.
The module will work with either the 350 Ohm resistance and 700 Ohm, but since it's been designed for a 350 Ohm bridge, this will be more sensitive.
I hope this informations will help you.
Regards
Andrea N.
Systems Engineer ATE & RF - Mediterranean Region
National Instruments Italy

For SCC-FT01 what is the maximum current for a 5 V excitation?

Simple question, Will my SCC-FT01 be able to handle a total current of 86 ma? I have a SCC-2345 and 6 SCC-SG24 I am using the FT01 to limit the excitation to 5 VDC for my 6 load cells.

Have you considered using the +5V reference to limit the voltage to
your load cells? You would have to measure the actual reference
voltage as it will not be exactly 5V and take the difference into
account when you measure the value from the load cell.
Regards,
Micaela N
National Instruments

Why do I have multiple SG24 modules which have lost their ability to supply an excitation voltage?

I have a number of systems using the SC-2345 Carrier and measuring load
cells (full bridge) using the SG24 module. I have had these fail
to supply a voltage after operation for a short (1-3 months, not
continuous use) period, replacing the module seems to fix the
problem. This problem has been recurring, is there an issue with
these modules. I am using these with various daq boards including
PCI-16XE and similar boards (dependent on calibration cycles).
Thanks for any insight or experiences others have had.

Hey icebar,
Thanks for contacting National Instruments. We are not aware of any quality issues with the SCC-SG24. The input range on these devices is -100mV to 100mV, with an overvoltage protection of 28VDC. Problems like yours are usually associated with large spikes that can damage the module, caused by ground loops and so on. More information about your setup would be helpful.
Let us know if you have further questions.
Regards,
Kenn North
Senior Product Manager - Search, Product Data
http://ni.com/search

SCC strain gauge vi

Hi
i am using a MSLC G100 load cell to measure downward force. This is connected to a SCC-SG24 module inside a SCC-68 carrier connected to a PCI-6221 DAQ card. I'm using Labview 7.1.1
Does anyone which VI will simply let me read the voltage off it?
i'll be glad of any help
thankyou for your time.
Duncan

Hi,
an easy way to read the voltage is with the DAQ-Assistant. After you select it, just choose at wich input of your SCC-SG24 you are going to read the voltage. This should work fine.
Best regards,
Joaquin

Metadata - Issue Can You Customize Apertures Metadata to work with Bridge

I am a photographer and my workflow is to import all my images into Aperture library and add metadata. When exporting image is it possible to integrate the data with Bridge? This is important feature as most people do not import images with Aperture. The issue is that many of the field names are different or non existent between the two programs. For example Location in Bridge is Sub location in Aperture. Can you add contact info such as URL, email that are included within Bridge?
Is there a way to customize the metadata fields to work with CS3?
Any advise is greatly appreciated
Message was edited by: Keith254
Message was edited by: Keith254

Hello Dhruser1,
I think that the DAQmx Perform Bridge Offset Nulling Calibration should work for the SCC-SG24 module. Take a look at this article: Removing Large Initial Offset for Load Cell or Strain Measurements with SCXI-1520 or PXI-4220 in particular it mentions that using this VI in addition to the auto zero can introduce an offset. If you're doing both these is likely the cause.
Also, when you specify specific channels using the channels input are you also setting the "skip unsupported channels to false? If not this may be why it affects other channels.
I hope this helps, and if not please feel free to post back with an update after trying these things.
Cheers,
Brooks

Comment enlevé le bruit de mes signaux ?

Bonjour à tous
Je débute dans LabView, et il m'a été demandé de calibrer 3 loadcell, afin de pouvoir convertir leurs signal, de volt en Newton.
Jusque là, tout s'est bien passé. Mais j'ai pu constater un bruit persistant, que je n'arrive jamais à enlevé complètement.
Or, pour l'application demandé, je dois avoir un signal d'une grand précision.
Je m'explique.
Les 3 capteurs me donnent chacun un signal, que je convertit en Newton. Je fixe une planche sur les 3 capteurs. Par après, si je pose un objet sur cette planche, je dois pouvoir en déterminer son centre de gravité.
Il me faut le trouver en me basant sur un système d'axe X-Y.
Mon problème est que pour déterminer ce système d'axe, il me faut une très grande précision, et le bruit m'en empèche.
J'ai déja essayé avec des filtres, en utilisant tout les mode (Bessel, butterworth,Chebyshev,...) sans succes.
Après, je suis passé à une moyenne glissante (Moyenne Point par point). le résultat était meilleur, mais j'ai toujours une variation de +0,2 a -0,2N ce qui est toujours de trop.
Je travail sur un Pentium 4, 3,2GHz, j'utilise Labview 8.6, ma carte est une PCI-6221 et les modules sont des SCC-SG24
Je ne vois pas d'autre solution, je vous joint mon programme en pièce jointes.
Merci d'avance pour votre aide, je reste disponible si vous avez quelconque question.
Pierre-Philippe
Pièces jointes :
Program_calibrate_3_loadcell.vi ‏36 KB

J'ai suivi votre conseil, et voilà ce que j'ai obtenu.
Les pics du bas ne sont pas fixe, ils changent sans cesse (j'ai pris 2 images pour vous montrer).
Quels pics représente le bruits ?
Merci
Pierre-Philippe
Pièces jointes :
Spectre.jpg ‏204 KB
Spectre2.jpg ‏205 KB

Custom scaling of data without MAX?

Okay here's my problem. Hopefully you can help me or offer some helpful advice.
I am creating a user interface for data acquisition (only analog inputs are used). Thermocouples (Type J and Type K) will be used, as well as factory calibrated strain gauges. Some other sensors that can be linearized on a 0-5Volt scale might be used too.
I originally had my program set up where the user had to set up their channels in MAX and then come to the program I made. There will probably be a lot of scale/offset changes made by the users so channel configuration needs to be flexible. I changed the program to custom scaling. Instead of virtual channels the user just enters scale and offset values. These values are saved to a text configuratio
n file and later used on raw voltage.
Then I realized I would have to have the user input what type of sensor they are using because I'd have to compensate for CJC in thermocouples. AND, I dont think the SCC-TC02 is linear.
*Am I right in thinking I will have to use case structures when I finally scale data for LINEAR versus J THERMOCOUPLE versus K THERMOCOUPLE?
*How innacurate would my readings be to use the Labview's Thermocouple scaler VI and set the CJC to 1.25 volts (25 degC) rather than reading from Channel X+8.
*Is there an easier way to do what I'm trying to do? I know people do custom scaling, how is it done?
THANKS.
I have:
SC-2345 Module Box
SCC-TC02
SCC-SG24
LabVIEW 6.1

I'm not sure I see where your difficulty is.
I have always used custom scaling, MAX never did quite enough.
I have a cluster for each channel. The cluster contains a scaler (EU/Volt), an offset (EU@0V) and a channel type enum, among other stuff (channel name, units, filters, etc.)
When processing the data, look at the cluster for that channel. Use a CASE statement on the CHANNEL TYPE value. If linear, multiply the volts by the scaler and add the offset - you get EU (Engineering Units) out. If the channel type specifies some other type, use the appropriate linearization routine.
How innacurate would my readings be to use the Labview's Thermocouple scaler VI and set the CJC to 1.25 volts (25 degC) rather than reading from Channel X+8.
<
p>
Depends on which type TC, and where you are on it's range. You might expect 20 degrees or more error at the high end of some ranges, without proper CJC.
There's no easy answer to that question.
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

TEDS vi

Hi guys, i have a SCC68 with a SCC-SG24 module together with a 6229 DAQ card and i want to perform torque measurements using transducers from Transducer Techniques.
Now, the first thing of course is to read up on TEDS and i realise my LV 7.1 do not have VIs as decribed in Figure 10a. The Top Level VI Palette of the TEDS Library for LabVIEW in http://zone.ni.com/devzone/cda/tut/p/id/4470 Thus, i was unable to run an view examples without these VIs.
What are the software and version i need to have these TEDS VIs?

Hi Atma,
Glad to hear you were able to get the library set up. In regards to your first question, the reason people typically want to write data to the EEPROM of their sensor is to update information about when the sensor was last calibrated. This way the calibration information is always available to whomever uses the sensor.
In regards to your second question, yes, you can use your TEDS enabled sensor as a normal task. TEDS enabled sensors essentially save you the trouble of having to setup the sensor specifications before you use it and help protect you against using the wrong specifications for your sensor.
If you would like to read more information about TEDS, I would recommend taking a look here.
I hope this information helps,
Paul C.

Hardware failure? can't seam to set diff mode

This did work at one time. We have a DAQPad-6015 connected to a SC-2345 and a number SCC modules installed. One of the SCC is a "SCC-SG24" that is attached to a load cell. This circuit no longer works and I have noticed that I can not set the "Input Configuration" to "Differential" mode. Is there a chance the SCC-SG24 is wiped out? I tested the analog input channel with a SCC-T02 thermo input, single ended and seams to work. Replaced the load cell with the same results, not working. Is there a way to force diff mode?
Ken

Kem,
When the SC-2345 is selected as an accesory NRSE mode will automatically be chosen. This is not a choice the user has, so it looks like all modules plugged in the carrier are in NRSE mode, and to a degree this is true. But Strain gauge measurements are always differential. So what happens is the SCC-SG24 module automatically reads them in as a differential input and then passes on the appropiate signal to the DAQ card. So as the user you this is transparent to you, and you don't need to worry about trying to set it anywhere, because you simply can't change that once you select the SC-2345 as an accessory to your DAQ card. So try to take a measurement, and see if it works, and if it is within the tolarences you expect. Let us know how it goes.
-GDE

To whom it may concern Hi my name is Silvana Pires,I purchased an I Phone 4 S Model A 1387 EMC 2430 SCC.ID DCG E 2430 AIC.579 C-E 243 A in California one year ago,Unfortunately its Not working well the screen is getting black,and the phone is in goo

To whom it may concern
Hi my name is Silvana Pires,I purchased an I Phone 4 S Model A 1387 EMC 2430 SCC.ID DCG E
2430 AIC.579 C-E 243 A in California one year ago,Unfortunately its Not working well the screen is getting black,and the phone is in good shape I can prove it,the Apple support in Brazil doenst work like in USA.
I look forward to your reply and a resolution of this problem.
Thank you very much!!!

You are welcome. I'm glad you got it back up.
(1) You say you did the symbolic link. I will assume this is set correctly; it's very important that it is.
(2) I don't know what you mean by "Been feeding the [email protected] for several weeks now, 700 emails each day at least." After the initial training period, SpamAssassin doesn't learn from mail it has already processed correctly. At this point, you only need to teach SpamAssassin when it is wrong. [email protected] should only be getting spam that is being passed as clean. Likewise, [email protected] should only be getting legitimate mail that is being flagged as junk. You are redirecting mail to both [email protected] and [email protected] ... right? SpamAssassin needs both.
(3) Next, as I said before, you need to implement those "Frontline spam defense for Mac OS X Server." Once you have that done and issue "postfix reload" you can look at your SMTP log in Server Admin and watch as Postfix blocks one piece of junk mail after another. It's kind of cool.
(4) Add some SARE rules:
Visit http://www.rulesemporium.com/rules.htm and download the following rules:
70sareadult.cf
70saregenlsubj0.cf
70sareheader0.cf
70sarehtml0.cf
70sareobfu0.cf
70sareoem.cf
70sarespoof.cf
70sarestocks.cf
70sareunsub.cf
72sare_redirectpost
Visit http://www.rulesemporium.com/other-rules.htm and download the following rules:
backhair.cf
bogus-virus-warnings.cf
chickenpox.cf
weeds.cf
Copy these rules to /etc/mail/spamassassin/
Then stop and restart mail services.
There are other things you can do, and you'll find differing opinions about such things. In general, I think implementing the "Frontline spam defense for Mac OS X Server" and adding the SARE rules will help a lot. Good luck!

Scc-sg24

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