Calibration of scxi-1112

how do i calibrate Scxi -1112 internally and externally example using fluke instrument.
can i calibrate scxi-1112 using calibration executive.

Suresh,
I assume you will be using LabVIEW to perform the calibration (let me know if I am incorrect). The LabVIEW help for "SCXI Calibrate.vi" (Functions >> Data Acquisition >> Calibration and Configuration) describes its use for both internal and external SCXI calibrations.
Good luck with your application.
Spencer S.

Similar Messages

Calibration of scxi-1112 channels simultaneously

can i calibrate all the channels in the module simultaneously using Scxi -calibrate vi if so please send me a example in lab veiw

Suresh,
It is not possible to calibrate all of the channels in the SCXI-1112 module simultaneously. However, it is possible to design a program which will calibrate every channel sequentially without having to manually update the SCXI channel string between each calibration run. Simply place the SCXI Calibrate VI in a for loop. Use the index of the for loop as the channel number and create the channel string dynamically. You can then pass this string, which will change each time around the for loop, into the SCXI calibrate VI.
Regards,
Justin Britten
Applications Engineer
National Instruments

Problem to install modul SCXI 1112 with a 1000DC chassis

I want to install the module SCXi 1112 with the chassis 1000DC but when I test the chassis with NI Max, it don t find the module.I connect the chassis to a MIO 6025E. One precision, I have control the connection between the two elements and the autodetection don t find the module
warning message Failed to find Slot 1 is empty

Mous,
The first step is to make sure that the NI-DAQ driver is installed properly and that your DAQ board (6025E) is working properly.
Then, refer to page 2-6 and 2-7 of the SCXI 1112 User Manual. It gives some troubleshooting help for the error you are receiving.
http://www.ni.com/pdf/manuals/322476a.pdf.
You may also want to try installing the 2 modules separately and install them in different slots to rule out which module or slot is causing a problem.
Hope this helps. Have a great day!

Scxi 1112 can not acquire correct data at high temperature(higher than 700C)

A scxi-1112 module in scxi-1001 chassis is used to acquire oven Temperature. Software is LabView 8.5. when oven is ramping higher than 700C, the module gets wrong data, the data acquisition VI shows random values around 700C.It seems the scxi-1112 module "reaches" its maximum setting, which actually is 1000C. Can Anybody explain what's happening to me? Thanks.

Hi gq,
Could you please provide a screenshot of the
way you are configuring the task, as well as what the data looks like
that you are seeing when it behaves incorrectly? If you just perform a
voltage reading (instead of a temperature task), what values are
returned, and does it show the same behavior of reaching a certain
voltage and not ramping any higher? Also, how do you have your
thermocouple attached to your oven; is there any possibility that the
connection is conducting at that temperature? Also, regarding the use of different measurements in the task, are you using different modules in your system or are the measurements being done on the same 1112 module? Additionally, have you tried other channels and received the same problem? I look forward to reading your response.
Regards,
Daniel S.
National Instruments

SCXI-1112 aquires 1Hz other SCXI and PXI devices OK

SCXI-1112 aquires slow, < 1Hz. I have an SCXI-1160, PXI-6602 and PXI-6052E in the same Chassis and they aquire > 100 Hz.

Nardelli,
Could you provide some additional details concerning your setup? The SCXI-1112 has a maximum sampling rate of 333 kS/s. Thus, most likely, the program that is controlling the hardware is determining the sampling rate. Which development environment are you using? What type of programming structure are you implementing with regards to the SCXI-1112? Single-point acquisition (software timed)? Buffered acquisition (hardware timed)?
Spencer S.

SCXI 1112 and 1302 doesn't run at the same time

Hi,
I have SCXI 1112 thermocouple input module, SCXI 1180 feedthrough panel , and a SCXI 1302 terminal block connected SCXI 1000 chassis with SCXI 1349 adapter. I am trying to measure voltage by using SCXI 1180&1302, and temperature by 1112 module at the same time. When chassis is on SCXI 1112 runs without a problem; however, voltage reading coming through SCXI 1349 makes no sense (plus I can't run them at the same time, LAbview gives an error). While the chassis' power is off, it is the other way around, SCXI 1349 runs smoothly.
In addition to that, a radiometer, connected to a power supply, is wired to SCXI 1302 terminal block. When power supply is on, SCXI 1112 module's temperature reading is 4 times higher than actual value. In other words, power supply effects the readings.
Could you please give me some advice to solve this problem?
Thanks,
Azra

One piece of the puzzle you left out is the DAQ card being used in the host computer.
Without looking at some specifics on the SCXI cards/connectors you are using, I will comment you must be careful when you are using an 1180 feedthrough module. Keep in mind, the SCXI chassis is Signal Conditioning -- it's nothing without the DAQ.
I would recommend you back up a few steps, simplify the setup and test each input channel from MAX -- making sure you aren't overlapping channels between the 1180 to the DAQ and the SCXI chassis. Remember, most data from the SCXI chassis comes in on a single channel of the DAQ through the 1349.
Hope this might help.
RS

SCXI-1112 thermocouple with Autozero.vi

Please the following doubt I have on the example program "SCXI-1112 thermocouple with Autozero.vi".
In the vi's first sequence ground readings for each channel is found out and it is available in a 1D array. Each element in the 1D array corresponds to each channel's ground reading. These zero readings of each channels are to be substacted from each channel's subsequent data. But it is not doing so. In the second sequence since a column is indexed (which corresponds to one channel data) actual substraction is taking place between a channel's data and all channels ground readings available from first sequence. which is wrong.
Kindly clarify the above doubt.

Greetings,
You are correct. This example needs to be modified. The array of offset data should be indexed so that only one scalar value is subtracted from each element in the array of data from one channel. I have attached a modified version of the example.
Good luck with your application.
Spencer S.
Attachments:
SCXI-1112_Thermocouple_with_Autozero--Corrected.vi ‏147 KB

Read the voltage of CJT thermistor in SCXI 1112 module, revA

The KB does'nt answear the question. I've tried every combination of physical channel names but this hasn't worked such as ob0~sc1!md2!cjtemp0 (cjtemp-1), SC1Mod2SC1Mod1/_cjTemp0 etc. Below is the vi that I'm using. Shouldn't the channel appear when browsing the list of physical channels?
Attachments:
testit.vi ‏74 KB

Steve1,
Yes, the channels should appear in the drop-down list. Make sure you have your SCXI chassis configured properly under NI-DAQmx Devices, not Traditional DAQ Devices. As a side note, what errors are you receiving when you try to run your program? This may help in troubleshooting. Have a great day!

SCXI - 1112 wrong value with two channels

Hi,
I work with VI logger to acquire temperature with 1000DC chassis and SCXI1112. My problem is when I use more than 1 thermocouple, temperature is wrong : for exemple, I start an acquisition with two thermocouples connected and if I disconnect one, the value of the other change (not always same step).
My measures are made on PCB with potential : this can be the reason of my problem ?
Is there any solution to solve this ?
Thank you for your help
Regards
Michael

Hello,
Your problem seems quiet strange cause you're using 2 (or more) different
channels. It may be the consequence of the fact that you just touch the cold
junction compensation when you unplug a thermocouple. Or it might also be
linked to the fact that you bring cold air when you unplug it...
What's the temperature modification range? 0.5° ? 0.05°?
Regards
Richard Keromen
National Instruments France
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>> Découvrez, en vidéo, les innovations technologiques réalisées en éco-conception

SCXI calibration

Now I try to using SCXI-1112's built in sensor to measure outside temperature which is measured by thermocouple,through DAQmx I can define the input terminal and sensor terminal in SCXI-1112, I think I have done the sensor calibration, but when the system runs, the temperature drift largely from -20 - 890 degree, it seems it doesn't calibrate. I don't know why it changed so largely? have I completed the cold junction calibration or not? from other documents it seems I need calibrate reference coltage, and so on. please give me suggestion. thanks.
newguy

Hmmm, a temperature drift between -20 - 890 degrees doesn't sound like a calibration issue. Sometimes accidentally scanning the wrong channel which has nothing connected to it will show a reading that drifts like that.
Now I'm a little unclear about how you are trying to measure the outside temperature. Are you trying to read a thermocouple that is connected to the SCXI-1112? Or are you just trying to read the buil-in CJC sensor inside the SCXI-1112?
Since I can't be sure how you have tried to set up the measurement, try following the steps mentioned in the SCXI Quick Start Guide just to be sure it's done correctly. If it's the b
uilt-in CJC sensor you're trying to take readings from, use the channel string mentioned in Knowledge Base 0Z63B4AQ.
I hope this helps!
-Russell
Applications Engineer
National Instruments
http://www.ni.com/support

I am trying to configure my SCXI-1540 card for excitation voltage and frequency using MAX - but it is not giving me that option when I click on the card and then properties, am I looking in the wrong place?

I am trying to configure my SCXI-1540 w/1315 card for excitation voltage and frequency using MAX - but it is not giving me that option when I click on the card and then properties, am I looking in the wrong place?
I have LabVIEW Express 7.0 Professional - SCXI-1000 Chassiss - along with SCXI-1112, and SCXI 1520/1314 - cable to the PCI-6052E is attached to the 1520 card.
MAX says it recognizes all the cards in the chassiss.

Jeremy, Thanks for the reply.
I tried to set up the system as DAQmx.
I had MAX auto-detect the set-up - and it recognized all the cards - but did not select the 1315 accessory on the 1540 card - I had to do that manually - but in the configuration section I would select the accessory and it would deselect itself. I had to get out of the set-up and then right click on the 1540 card and click on the "Accessories" tab and select the 1315 terminal block that way.
It didn't seem right that the system should behave that way, but I pressed onward.
I then tried to create a new DAQmx Task
When I create new DAQmx task and then click on Analog Input no "Position" Tab appears for me to select, all I get are:
Analog>>Voltage
Analog>>Temperature
Ana
log>>Strain
Analog>>Current
Analog>>Resistance
Analog>>Frequency
Analog>>Custom Voltage with Excitation
Do you think there might be something wrong with either my hardware or perhaps my configuration that is not allowing it to recognize the 1540/1315 in DAQmx?
I had included the system report of what programs I am using, etc. as attached file nireport.txt
After the DAQmx did not work I tried installing everything as Traditional DAQ and it did let me set-up the 1540 Card with Excitation Voltage and Frequency and gain - I then went in to the VI that I had built and tried to use the Express DAQ Assisant to read the channel that I am connected to on the 1315/1540 - when I try to use DAQ Assistant it gives me an error saying that "Device not available in NI-DAQmx. It is possible that the device is being use by traditional NI-DAQ"
Which I guess it is since both configurations are now set-up in MAX.
I would PREFER to use the DAQmx set-up, but I am confused as to WHY it won
't come up with
Analog input>>POSITION>>LVDT
When I try to create a new DAQmx task.
Thanks for the help so far! As you can probably tell I am new at this.
Ryan
Attachments:
nireport.txt ‏2 KB

How do I AI config for SCXI multiple non-contiguous channels

I need to configure a measurement of with multiple groups of thermocouple channels.
Using LV 5.1.1 (could use 6, but I am supporting lots of code built with 5.1.1), DAQ 6.8.1 (can up to 6.9.1 if it matters), PXI-6052E, SCXI-1102, SCXI-1303 (or TC-2095).(using SCXI addressing).
The problem occurs when I try to configure multiple scan lists with gaps between channels.
(see LV DAQ SCXI example SCXI-1102/1127/1101 Thermocouple)
example channel list:
ob1 ! sc1 ! md1 ! cjtemp
ob1 ! sc1 ! md1 ! 0:3
ob1 ! sc1 ! md1 ! 5:9
This gives an error: -10370 in AI Group Config.
Likewise if I use an individual channel in each address string. like:
...md1 ! 0
...md1 ! 1
...md1 ! 3
But, I can skip channels betwe
en cjtemp and the first channel of the next scanlist without error.
Also, I can add scan lists for other modules, like:
...md1 ! 0:3
...md1 ! 4:8
...md3 ! 12:14
without error!
What I really want to do is to do AI Config first for all channels, then start, then loop on AI Read and some processing & storage.
When I loop through the channel address lists (strings with contiguous channel sets e.g. 3:6) I get the same task # for all config calls. Then when I loop through the AI Start's for each , I get an error -10609 in AI Clock Config.
The thing is that I cannot necessarily have all contiguous channels, and I don't want to go through a sequence of {AIConfig, AIStart, AIRead, AI CLear} for each scanlist each time through. That takes too much time and resources.
Eventually I want to configure multiple non-contiguous scanlists in multiple SCXI modules.
But, for right now I need to do this for one SCXI module.
Anyone have any ideas?
How can I approach this.
Thanks
Dave

Dave
Check the following link into the NI Knowledgebase (if you haven't already)
which I think explains your situation.
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/02a55e1f39
e8bd15862567e700577877?OpenDocument
Bottom line is you will not be able to skip channels on any SCXI module
other than the SCXI-1112. You will need to include the channels in your scan
list then discard the data later.
Either that or as the Knowledgebase suggests, use Virtual Channels. You can
then miss channels out in the scan list as you require. They actually get
scanned but NI-DAQ discards the data for you.
Ian Bell
NI UK
"Dave Karon" wrote in message
news:[email protected]...
> I need to configure a measurement of with multiple groups of
> thermocouple channels.
> Using LV 5.1.1 (could use 6, but I am supporting lots of code built
> with 5.1.1), DAQ 6.8.1 (can up to 6.9.1 if it matters), PXI-6052E,
> SCXI-1102, SCXI-1303 (or TC-2095).(using SCXI addressing).
>
> The problem occurs when I try to configure multiple scan lists with
> gaps between channels.
> (see LV DAQ SCXI example SCXI-1102/1127/1101 Thermocouple)
> example channel list:
> ob1 ! sc1 ! md1 ! cjtemp
> ob1 ! sc1 ! md1 ! 0:3
> ob1 ! sc1 ! md1 ! 5:9
> This gives an error: -10370 in AI Group Config.
> Likewise if I use an individual channel in each address string. like:
> ..md1 ! 0
> ..md1 ! 1
> ..md1 ! 3
>
> But, I can skip channels between cjtemp and the first channel of the
> next scanlist without error.
> Also, I can add scan lists for other modules, like:
> ..md1 ! 0:3
> ..md1 ! 4:8
> ..md3 ! 12:14
> without error!
>
> What I really want to do is to do AI Config first for all channels,
> then start, then loop on AI Read and some processing & storage.
> When I loop through the channel address lists (strings with contiguous
> channel sets e.g. 3:6) I get the same task # for all config calls.
> Then when I loop through the AI Start's for each , I get an error
> -10609 in AI Clock Config.
>
> The thing is that I cannot necessarily have all contiguous channels,
> and I don't want to go through a sequence of {AIConfig, AIStart,
> AIRead, AI CLear} for each scanlist each time through. That takes too
> much time and resources.
>
> Eventually I want to configure multiple non-contiguous scanlists in
> multiple SCXI modules.
> But, for right now I need to do this for one SCXI module.
>
> Anyone have any ideas?
> How can I approach this.
> Thanks
> Dave

How do I take a thermocouple reading with a pci6025E?

How do I take a thermocouple reading with a pci6025E? I have seen some postings with scxi-1112 modules which I do not have. I need advice from the ground up. Do I need external circuitry, can I just wire both leads of the thermocouple to Ain0 differential pins, what vis are necessary in the actual programming... If there is an example program or anything else that might seem relavent? I appreciate any help.

This is most probably a result of multiple factor that make the measurement imperfect:
- You're not using signal conditioning, so your resolution is definitely very reduced. Any temperature drift in the board could cause a big difference in the reading. I recommend you run your vi for approximately half an hour, unplug the accessory and perform a self calibration. This will have the board at the operational temperature you're expecting and will give you the best results.
-I personally would recommend using a different sensor type (RTD or Thermistor) as the CJC source, in order to obtain an accurate measurement, otherwise you have a bit of a "chicken and egg" problem, because you're using thermocouple 2 as the CJC for thermocouple 1, but what are you using as the CJC source of thermocouple 2?
- Are both your thermocouples of the same type and manufacturer? Due to the nature of the thermocouple itself, you can find slight variations between thermocouples from different vendors, due to the purity of the metals used. While this would usually be almost impossible to detect, it might be driving your voltage just enough to be in the next detectable voltage step (again, due to the reduced resolution).
- I've worked with temperature sensors for a while, and I'd still recommend that you try some sort of signal conditioning in order to increase your accuracy. Even a small amplifier and a passive lowpass filter will do great. I know you said you don't have SCXI, but if you want some lower cost ready to use applications you might consider looking at the SCC Carriers and modules we have.
I hope these suggestions help. Please let me know if you have any other questions.
Daniel

A doubt on stabilty of temperature measurement

I have a SCXI-1102,and two SCXI-1112 in a SCXI-1000 chassis with a SCXI-1303 terminal block. I connected one thermocouple at Channel 0 in SCXI-1300, and also connected other TCS to SXCI-1112. And I tried to measure ambient temperature by T-type thermocouples. In VI, I set CJC type to be constant value, and it automatically set default temperature at 25 degree cellsius. Then I test it, but temperatures by thermocouples are differert from the value of thermometer. So I changed CJC constant values accordingly, and I testest again, It still did
not show the right value.
BTW: When the data acquire system run for a long time, such as half an hour, does it affect the data
acquired?

Both of the modules you mentioned have built in cjc sensors. You mentioned the 1303 terminal block then later called it a 1300. The 1303 should have a more accurate cjc reference than the 1300. I have not used the 1112 but since it is designed specifically for Thermocouple measurements they should have a decent cjc sensor network. I will mention that the miniconnector plugs should be the right type for the T type you are using but I imagine you have done this.
In the scan mode your 1102 module will continue to scan the cjc so changes in ambient temperature at the chassis should be compensated for. Since the 1112 are newer module they should do the same. Some of the older isolated modules only picked up the cjc reference at on the initialization of the sc
an. I have used the 1102 modules with the 1303 terminal blocks for several years. The accuracy of this combination usually keeps me within a couple deg F. when I check the system.
If you are using the 1303 terminal block make sure you have the right resistor network for your application. Check your documentation for if you have the 10 ohm bias resistor in and your tc is grounded you will see a significant error.
There are ways of using an external CJC to improve your accuracy if needed. These methods will increase the cost of your system, as they will require additional hardware.

Which chassis port will be required for project of robotic arm(interfacing)

hello..
actually few hardware attachments ports are present at my uni labVIEW setup, that are:
ni pxi-1050, ni pxi-8196, ni scxi-1102b, ni scxi-1112, ni scxi-1162, ni scxi-1124
but i dont know which one is required for interfacing robotic arm project.
plz help...........

Hello,
In the system you specifed you will also need a DAQ card which will control the SCXI portion, Generally SCXI hardware is used for signal conditionin, and I have not seen anyone controlling motors of a robotic arm. If you want to interface robotic arm you should look into Motion cards or RIO solutions. This link might help getting started with what hardware you might need for this project.
Hope this helps
NI-khil

Calibration of scxi-1112

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