Cannot detect channels of PXI 4351

Hi there. I am new with labview and also the NI products. I just got myself a PXI 1042 controller with PXI 4351 card. I got to know that DAQmx can't be used to program the labview. I am using labview 8.2.
I can detect the card under DAQ traditional in MAX. How do I assign the channels in Labview 8.2? I can see the DAQ traditional in the Instrument I/O, but I dont know how to go about assigning the channels. I am only trained in DAQmx and I can't find any samples in the using traditional DAQ in 8.2.
Please help

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Cannot detect PXI 4351 channels

Hi there. I am new with labview and also the NI products. I just got myself a PXI 1042 controller with PXI 4351 card. I got to know that DAQmx can't be used to program the labview. I am using labview 8.2.
I can detect the card under DAQ traditional in MAX. How do I assign the channels in Labview 8.2? I can see the DAQ traditional in the Instrument I/O, but I dont know how to go about assigning the channels. I am only trained in DAQmx and I can't find any samples in the using traditional DAQ in 8.2.
Please help.

Have you installed Traditional (Legacy) NI-DAQ 7.4.2 from the LabVIEW driver CD??
If you have, the Traditional DAQ example VI's will show up in Find Examples>>Hardware input output>>Traditional DAQ>> Analog Input folder
Also, once you have installed the required Traditional DAQ device driver you can refer to this example code
Hope this helps
Regards,
Dev

Fetch and peak detection all channels of PXI-5105 with 4M record... HELP!

Dear collegaues!
Please help me to improve performance my application, see attachment, and sorry for my English.
So, my task is to fetch and peak detection all (eight) channels of PXI-5105 with 4M record and sample rate 4M with loop 1 sec...
Inputs of all my channels are wiring to NaI detectors with 0,5...1 microsec of pulse width (really) and freq from 0 kHz to no more than 40 kHz.
Why I've selected 4M record and 4M sample rate namely? Answer is that I've tested PXI-5105 previously by generator 40 kHz and 0,5 microsec width pulse. It is working fine and peak detection indicate for me 40000 pulses/sec. If I set lower than 4M record and 4M sample rate it is no working. In my honest opinion 4M record and 4M sample rate are very min settings.
In the present time peak detection working only 6 channels... When I've connected to diagram more than 6 "peak detector.vi" - I see the error "...out of memory...".
Please advise me, what is to be done for that is all working fine.
Solved!
Go to Solution.
Attachments:
consumer-producer7.vi ‏44 KB

What you are running into is an out of memory error in LabVIEW. You have enough onboard memory to capture 4M samples per channel on the digitizer. The issue is with fetching and manipulating that data in your LabVIEW application. You will want to step back and take a look at how you are handling your data to understand why that is happening.
1) 4M samples/ch = 4M Samples x 2Bytes/sample/ch = 8M Bytes/ch
2) Expanding to 8 channels creates 64M Bytes of data in the raw binary format
3) You are scaling your data by fetching in a 1D WDT format. This stores each sample in a 32 bit double, expanding the memory to 256M Bytes (in addition to timing information)
4) By splitting up the array of waveforms and branching data it you can easily create copies of this data, and if your consumer loop is not completed with the last data, you may be trying to capture a whole new set, creating yet another copy.
So you can see that while you have 1.5GB of controller memory, when dealing with large arrays of data you can easily eat up that memory. There are several things you can try to make your application more efficient. You could work with an unscaled binary data format, you can wire the array of waveform directly to the peak detect vi (instead of creating 8 copies, you will have a single copy with arrays of output) or you could revisit the record size you have chosen (experimenting with your threshold and width settings might help you to get the results you want with smaller record lengths).
-Jennifer O.

Error 1074397153 Cannot Detect Recognizable Video source

I'm using a single PCI1410 card to acquire images from two cameras and display those images in Labview using the Multiple Camera Acquisition.vi found on the NI website. I'm running Windows XP, and my two cameras are Sony XC-HR70's with a resolution of 1024X768 each, running ~15FPS (total for both) thru the frame grabber. I have one camera as a master, supplying the HD & VD synch signals for both my slave camera and the PCI1410. Here is my problem:
      Whenever I change the light intensity for the cameras drastically (ie, abruptly shutting off the light source or blocking the camera), I get an error in Labview: "1074397153 @ IMAQ Extract Buffer.vi.   NI-IMAQ: Cannot detect recognizable video source". If I perform a gradual decrease in light intensity, I don't get the error. Unfortunately, the users often need to toggle on and off my camera illuminators abruptly, so a gradual transition is not an option.
       I thought this was a MAX issue, but it is not-MAX gives no errors regardless of light intensity.
       I also tried decreasing the white level and/or increasing the black level-(per NI Knowledgebase post) all that did was decrease my image quality, error still appeared. The error first appears in imgwaitforimaqoccurrence.vi which is inside imgsessionexaminebuffer.vi.
If I could somehow ignore the error and insert a ~ 500mS delay and then re-attempt to acquire video lock, it would probably work. Just not sure how to do this, or if it is the right approach. Any ideas?

Hey wowens,
I was wondering if you ran just a simple grab example program, and perform the same action of shutting off the camera's light source, do you get the same error? The error you are getting means that the frame grabber is not receiving any data from the camera in the expected timeout period. There shouldn't be any reason why decreasing the light quickly should stop the camera from sending data, as the camera should still be sending some data, like all black pixels or something. I might suggest tapping the data coming in with an oscilloscope to see if the data stops when you decrease the light. If you can't do this, I might suggest altering the code so that you don't stop the loop. You could also look at the shipping example called LL Scan Multiple Channels.VI. What version of the NI-IMAQ driver are you using? I would suggest that you upgrade to the most recent if you don't have it. Other than that it sounds like you need to find out what is causing the error before you start to find a solution.
I hope this helps at least a little. Let me know if you have any questions or concerns. Thanks, and have a great day.
Regards,
DJ L.

AI Buffer Read Problem with PXI-4351

I have a PXI-8105 controller in a PXI-1045
chassis with labview 8.2 installed. I would like to use a PXI-4351
board to measure a thermistor. I am using the sample vi on the ni web page http://zone.ni.com/devzone/cda/epd/p/id/838, but I get an error code -10846 "AI buffer read" after a few acquistions. I am new to Lab view --- what does this mean and how do I fix it?

Well, I don't have ready access to a LV PC and for some very odd reason, my attempt to search for "error code" (and even just plain "error") on the ni website returned 0 hits?!? Strange...
Anyhow, I'll take a guess and offer you an idea for a workaround. Could your error mean that your call to AI Buffer Read times out before the requested # samples have been taken? This kind of error wouldn't be surprising as it's difficult to determine a reasonable timeout value. Based on my own past experience with a 4351 board, I'd say that the whole notion of "sample rate" turns into something of an odd duck.
As I recall, all you can specify is a filter frequency which will establish a ceiling for your actual sample rate. However, the board also has some sort of criteria for signal stability. If you have several different channels to measure which use different input ranges, your actual sample rate can be reduced pretty dramatically. So you might get a few samples per second or a few seconds per sample.
The workaround I used was to always request data that had already been collected and was immediately available. One of the inputs to the AI Buffer Read lets you set some parameters where you can specify that you want to read the most recent sample that's already in the buffer. Granted, this may represent a temperature from a second or two ago, but this lag is not necessarily a major issue for temperature measurements.
Note: in my app, I could query for Temperature any time I wanted, as frequently as I wanted. I would always get data back, but there was no guarantee that I'd get *unique* data back. In other words, if I called it 10 times in a tight loop, I might get the exact same sample # back each of those 10 times.
-Kevin P.

TC measurements with PXI 4351 DAQ Card

(I am using version 6i of LabVIEW). I am trying to create a VI that will use a PXI 4351 Card with a TBX-68T to take 4 thermocouple continuous measurements. I am also acquiring 8 voltages with a 6030E and TBX-68 and writing them to a file. My voltage data acquisition is modeled after "Buffered Continuous Analog Input.vi" I would like to aquire voltages and temperatures in the same vi, but using different devices and accessories. (I need a higher frequency for the voltage acquisition, and more precision with the temperatures). Is there a subvi I can use to collect the temperature data in the same vi as my voltage? I don't want the thermocouple DAQ to interfere with the voltage DAQ, either.
I tried the NI435x thermocouple.vi
but I couldn't get the Built-in Cold Junction Sensor to work or figure out how to combine it with my exisiting voltage acquisition. I also got NaN for my readings, and I checked the wire connections in all the sub vi's as suggested by another solution.
Any comments would be great. Thanks in advance.

Claudia-
Thanks for the response.
Regarding the CJC- When I switch it on, the temperature readings I get are very random, roughly negative 1 degrees. (I am operating right now at room temperature, and will be using J-type TC's to measure ~43 degrees C). Also, when I use the built-in CJC, the aquisition rate seems to slow down considerably. When I use the "user specified" everything seems to be ok, including the aquisition rate.
I measured the resitance of the Thermistor on the TBX-68T and it was about 5000 Ohms, as expected.
Just to make sure: When using the TBX-68T, do I need to hard-wire a thermocouple to Channel 1/auto-zero and another to channel 0/CJC? Because I connected a TC to channel 0 right now, but I wasn't 100%
sure.
I've attached my main vi and two sub vi's that I am using for the voltage aquisition part of my project. (Note:the current measurements are just voltage measurements multiplied by the recipricol of the resistance it was measured across, ie. 10).
I would like to keep this file as is because it writes to a file exactly the way I want it to. I'd like to have the temperature aquisition with the 4351 in the same vi as the 6030E so that they both stop and start at the same time. I am just not sure how and where to log the temperature data since there will be fewer data points than the voltage data. Any suggestions? Should I write two separate files? can I somehow append them?
Thanks again. Hope to here from you soon.
Attachments:
EBlackMainDAQ.vi ‏107 KB
Save_Data8.vi ‏45 KB
Build_String_Array5.vi ‏33 KB

NI PXI 4351 read temperature

Hi,
I'm trying to read temperature from TBX-68T connected to NI PXI-4351.
I see PXI-4351 in my hardware explorer, it show me right data in test panel.
But, I can't found any tools for reading temperature in LabView!
I installed drivers for NI PXI 4351
http://joule.ni.com/nidu/cds/view/p/id/285/lang/en
but still noresults. Driver didn't contain any examples for reading.
I use LabView 10 and I have NI DAQ Traditional 7.4.4
so, I confused. How read temperature?

JaredRo wrote:
Hi kmcdevitt,
The SC Express product family was specifically designed to take advantage of the PXIe architecture and therefore the timing circuitry on the PXIe-4353 is not designed to be compatible with the PXI platform. There are no plans to design any of the SC Express products in the PXI form factor.
Jared,
Please explain what it is that makes the PXIe-4353 so special that there can not be a PXI-4353.
This 32-Channel, 24-Bit, Thermocouple Input Module does 90 S/s/ch sample rate in high-speed mode or 1 S/s/ch sample rate in high-resolution mode. Surely you are not claming the the PXI platform's architecture and timing circuitry can not hadle the troughput generated by the 32 channels of 24bit data at 90Hz.
Jared, it is not a pleasent fealing to be prommised that the new signal conditioning cards are going to be made for your soon to be purchased PXI-1045 chassises, and later find out from an Applications Engineer Jared that it has been in the plans to never make PXI versions of signal conditioning cards. How would you feel if you purchased about 30 PXI-1045 18 slot chassises with PXI Embedded RT controllers with the promiss that if you bought the controllers and chassises that NI would continue to develope new Signal Conditioning and Other PXI Cards for your chassises. Just buy them, and the new PXI cards will come. How would you feel when you were told to be patient and just wait till next years NI week. How patient would you be after the second year of being told to be patient until the next year's NI week? How patient would you be after the third year of being told to be patient until the next year's NI week? I have been recently asked to be patient again. NI Week 2012, there may be something. And now you tell me that there will never be anything.
I just don't buy it that there is something about the PXIe architecture and therefore the timing circuitry that is required for 90 Hz data.
Kevin.

Temperatures corresponding to voltage ranges with the PXI-4351/TC-2190

Using a PXI-4351 and TC-2190 with a K-type thermocouple, what temperature range do the voltages (+/- 625 mV, 1.25 V, 2.5 V, 3.75 V, 7.5 V, and 15 V) correspond to? How much accuracy does each different range of voltages have? All I could find was that to get improved accuracy, use a range of 2.5 volts or less (document #1X0F7L3E). Also, will using several channels at vasly different temperatures (ie. room temp. and several hundred degrees) affect which range I should select?

The full temperature range of a K type thermocouple from -270C to 1370C represents a voltage range from -6.45mV to 54.8mV. If the only sensors you are using are thermocouples then you should choose the smallest range. The 4351 applies one gain setting to all channels, so the only reason you would want to use anything but the smallest range would be if you have other types of sensors with larger voltage swings. You can find voltages for any thermocouple at any temperature at the link below.
Regards,
Brent R.
Applications Engineer
National Instruments
http://srdata.nist.gov/its90/menu/menu.html

PXI-4351 reading rate

Hello,
I'm using a 4351 board for RTD and thermocouple measurements. I've got a strange behaviour when activating "auto-zero at start" : the reading rate is higher than with no auto-zero at all. It looks like it was in "Fast" mode, although i leave the reading rate in "Slow" mode.
I'm using a pxi controler with labview RT 8.2.1 and 435x driver 2.5.2.
Any help would be very appreciated
regards
Ludos

Hello,
Thank for your answer.
In fact, the acquisition in "Slow" mode is not too slow, it just match the spec (p 2-4 of the NI 435x User Manual), witch is given with no auto-zero : 2.8 readings per second, to be divided by the number of channels.
With 5 chanel (+ 1 for CJC), the acquisition take approximately 2.15s in slow mode, no autozero => 2.8 readings/s
Activating Autozero per scan add 1 channel measurement (around 2.5 s => 2.8 readings/s).
Activating Autozero at start should impact only the first scan... but here, it take 0,7 for the whole scan => 8.6 readings/s. That's near from the Fast mode spec : 8.8 readings/s.
My config is a PXI-8106 RT controler with a PXI-4351. I'm Using Labview 8.2.1 with corresponding RT module. And the driver for the 4351 is ni435x 2.5.2 / traditional DAQ 7.4.4
Regards,
Ludos

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Cannot detect channels of PXI 4351

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