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

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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.

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 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

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!

Selecting SCXI-1122 channels in the Test Panels

All 16 SCXI-1122 channels are multiplexed to channel 0. Is there a way in the Test Panels in MAX to select a specific channel of a SCXI-1122 card in SCXI-1000 chassis so that voltage appears in the test panel?
Message Edited by paryani on 08-25-2007 02:52 PM

Paryani,
Look at the attached screenshot. It shows where in the test panel you can select an individual channel and see the voltage.
Alex A.
Applications Engineer
Attachments:
1122test_panel.JPG ‏132 KB

Multiple channel simultaneous data aquisition with 6601 counter

Not concerning my primary question, I would like to point out to an N.I. Rep. that there is a typo in the help section concerning "posting a message".
I have built a large format, two axis digitizer using linear encoders, a 6601 counter/timer, and labview 8. In building my application program, I initially am using two daq assistants, with each set up to accomplish the task of reading two encoders (2 channels) simultaneously. In doing some research, It has come to my attention, that with my current configuration, errors may result, due to one daq assistant attempting to access the cards driver while the other is acquiring data. All attempts to get two channels working through a single daq assistant have resulted in an error message informing me that I can only have one task per counter.Thus far, I have not seen any noticeable errors, thought I would like to have this device "rock solid", as it will be used extensively.
How can I get two channels working through one daq assistant?
Is it possible, that I should have purchased an "S" series board instead?
Any help on this, is welcome!

If you are using different counter channels for each assistant task, then you should not receive any errors. It's not possible to get two counters working through the same assistant task. This restriction would also apply to S Series boards as well, so you should be fine with your application.
Please post again if you have any problems with this.
gus....

Logic audio engine crashes while streaming video and recording 4 channels simultaneous audio

logic audio engine crashes while streaming video and recording 4 channels simultaneous audio

Hi there,
I also wanted to thank you for your response and let you know that I have tried all those trouble shooting things you suggest to no avail.
it seems to me that the first explanations are most likely to be the case.
namely that the program can multithread while the plugs only use one processor (particularly EXS24) which is bloody useless.
also increasing the buffer to 1024 is not an option cause you gotta bloody lay tracks, which means you gotta hear the BG tracks and play yours on top in time otherwise, you record your new tracks and they are so out of time that it sounds like a little kid wanking on a guitar or whatever...
and of course for composition with midi intruments it doesn't work at all cause your latency becomes so huge that you would need a miracle to quantize your off time notes back to normal so that you can arrange, print score, etc.
either way, I hope that my tone is not disrespectful, it is aimed at apple in frustration, I'm grateful for your help.
thank you
David

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.

Using 2 ni usb 9215 devices to sample 8 channels Simultaneous

Hi,
I Need to sample 8 channels Simultaneous using usb devices.
If i use 2 9215 ( 4 channels ) devices in a 9172 chassis i will get acctually 8 channels Simultaneous ?
Does the 2 devices use the same clock?
Is it realy Simultaneous ?

I just want to be sure it is possible to have 8 samples Simultaneous before i buy the devices.
If you want to be sure, then don't trust me!
I suggest you call NI directly and when talking to the inside sales rep, ask them to let you talk to support so they can send you an e-mail stating if the operations you need are supported.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

How to acquire from various AI channels simultaneously with a different range for each one?

How to acquire from various AI channels simultaneously with a different range for each one?
In LabView I have found some examples but in C there isn't seem to be any.
Solved!
Go to Solution.

Or you can add channels one by one with individual instructions: the follwing code compile and runs with no errors on a vitual daq device:
err = DAQmxCreateTask ("", &taskH);
err = DAQmxCreateAIVoltageChan (taskH, "Dev1/ai0", "AI0", DAQmx_Val_Cfg_Default, -5.0, 5.0, DAQmx_Val_Volts, "");
err = DAQmxCreateAIVoltageChan (taskH, "Dev1/ai1", "AI1", DAQmx_Val_Cfg_Default, -10.0, 10.0, DAQmx_Val_Volts, "");
DAQmxStartTask (taskH);
err = DAQmxReadAnalogF64 (taskH, 5, 10.0, DAQmx_Val_GroupByChannel, val, 10, &read, 0);
DAQmxClearTask (taskH);
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My contributions to the Developer Zone Community
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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

Looking for a simple app that can output 8 channels simultaneously.

Hello esteemed audio community.
I have to create a little effect for an upcoming party. For this I have created the following audio tracks in Garage Band:
- 4 separate audio channels (stereo front and stereo rear)
- one mono combination of these four tracks (to drive a Light organ gizmo - makes the light flicker with the audio)
- and finally two separate tracks with simple 1Khz pulses to trigger relays for a fog machine.
I now need to be able to play these 7 tracks simultaneously and send them to different amplifiers and relays. So I need two things: 1) a software that can play them and 2) a hardware interface that can take these 7 channels out of the computer and convert them to line levels analog signals.
I thought this would be pretty straight forward but it turns out that it is not, unless you want to throw $$$ at it which I really can't afford.
Software wise, unfortunately, GB can only output 2 audio channel at one time. So I need to find a little app that can offers multitrack output. Ideally it would some shareware thing that would allow me to load in up to 8 tracks saved from GB, adjust their individual levels and then output them.
Second issue is hardware. Here I have found the M-Audio 410 firewire. This box will take up to 10 audio "returns" and output them to analog. They can be found used for about $150. So I think this might work.
Budget for this setup is very limited, hopefully no more than $150. Quality does not have to be very high although a good bass response will be important for the effect. I don't need any recording. Only playback.
Would any one have any suggestion on how to best accomplish this? If this software does not exist, how complicated would it be to write it? Would Applescript be useful for this? All it needs to do is read 8 audio files (2 minutes max), allow me to adjust their level and output all 8 at the same time.
Thank you very much for any help.
Bo

Ah. I'm surprised, but there we go.
Have a look here ...
http://jam.hitsquad.com/vocal/about2136.html
(courtesy of googling 'OSX free multitrack recording software')
Didn't have time to do more than skim, but 'Ardour' looked promising. Protools is the only one I've used, the full product is one of the industry standards, but the free 'lite' version listed here seems to be limited to 2 in/out as well.
Referring to your original post, I'd think trying to write or 'script' something would be a nightmare ... synchronisation of streams within something like Applescript would be a major issue, quite apart from anything else.
G5 Dual 2.7, MacMini, iMac 700; P4/XP Desk & Lap. Mac OS X (10.4.8) mLan:01x/i88x; DP 5.1, Cubase SX3, NI Komplete, Melodyne.

How can I use LabVIEW to ground floating SCXI-1520 channels (in order not to lose scanning capabilities from the multiplexer)?

Currently I am reading quarter bridge strain with several SCXI-1520s. When in MAX I noticed my values were no longer reading after a certain gage and as I attempted to troubleshoot, found out that the multiplexer in this module will not scan past any open channel (or if it does, channel results are not consistent) for a very logical reason. If I lose a gage, I usually lose any data from any subsequent gages which we really cannot afford.
Are there any suggestions programming in LabVIEW (right now i'm using NI-DAQmx with an analog task set up)so that each time my loop executes, the program will check for any open channels and either not collect that data or change the order of acquisition (i.e. place the open channels last on the scan list?
I'm open to anything that might be of help

Yes, by "open channel" i mean that there is no signal returning from the gage because it has broken off the structure or the signal to the terminal block has been disconnected somehow.
When I lose data, I'm referring to the data that is acquired on following channels. The behavior appears to be fairly random (which was a troubleshooting nightmare ) but usually if a channel is open, then that and those behind it in the scan order do not return any data. It returns a number like 10.357E-6 and I do not pick up any noise or fluctuations. As far as I understand, the multiplexer stops scanning at this point (open channel) because it has nothing to ground to and subsequently "hangs" - not (or randomly) scanning the following channels. I have gone through the bridge configuration and as of yet, have not figured out how to fix this using any hard-wiring techniques. I emailed NI, and was sent a library file to "ground the channels" but it actually resets the Analog input Task I have defined each loop.
I am new to NI-DAQmx so I do not know if this will alter any configurations I already have in MAX for NI-DAQmx. Will it override? I am concerned it will slow my loop time, and also I cannot see the code for this sub.vi so am a little skiddish about using it if i do not know if it can be tailored to my app.
What do you think? Am I on the right path?

Calibration of scxi-1112 channels simultaneously

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