PXI-4496 vs PXI-4462 resolution

Is it possible that for a same voltange range, the PXI-4462 card has a lower resolution that the PXI-4496, even if they are both 24-bit?

Both cards are 24-bits.
Using the PXI-4496, on a +/-1 Volt range, the 24 bits seems to be dictributed over à 2.2 V range (-1.1 to +1.1).
Using the PXI-4462, on the equivalent +/-1 Volt range, the 24 bits seems to be distributes over a 3.8 V range (-1.9 to +1.9).
By resolution, I mean the smalles voltage increment we can measure, i.e. Q= (Vrangemax-Vrangemin)/(2^24).
 

Similar Messages

  • PXI-4462 problem...

    Hi All!
    I have PXI-1036 DC with 8101RT+6653+6682+4462.
    It seems thereis a problem with PXI-4462 driver:
    I format disk and install fresh system software (step by step). When I install DAQmx 9.7 with DSA, after reboot I see message after "Welcome to LabVIEW Real-Time 12.0f4" :
    ing the driver might fix the issue. Ohterwise, contact National Instruments technical support."
    PXI-4462 appears in MAX with some duplicated device (Dup.jpg). When I call Test Panel, I see error (see TestPanel_Error). After "Yes" and press "Start" I see error as on TestPanel_Opened.jpg.
    What's happened?
    Jury
    Attachments:
    Dup.JPG ‏176 KB
    TestPanel_Error.JPG ‏188 KB
    TestPanel_Opened.JPG ‏198 KB

    Hi Jury,
    Have you tried to Reset the device in MAX?  I assume you've already tried rebooting the system, right?  What about moving the device to a different PXI slot?  Or even a different PXI system, if available?
    If none of those steps work, try deleting the device from the Windows Device Manager, and allow the operating system to redetect it and install a fresh version of device drivers.
    See this article, for reference.  If none of these steps yield any change in behavior, it may be necessary to send the hardware in for repair.
    Kyle B  |  Product Support Engineer  |  ni.com/support

  • PXI-4462 - Radio Sound Environment

    Hi, everyone.
    I have a PXI-4462 audio card.
    Is it possible to use the card to analyze and measure the Sound Environment Settings (eg, Jazz, Rock, Classical, and etc) of a radio audio outputs?
    20Hz and 20kHz is the range of the interest frequency for plotting a graph of Gain (dBr) vs freq.
    As I know, I may need to sweep the freq range of 20Hz to 20kHz for obtaining the curve.
    Hope someone can help to advise.
    Attached is the example of the EQ measurement in graph.
    Thanks in advance. 
    Attachments:
    800px-Peaking-eq.svg.png ‏20 KB

    Hi Karthik,
    Can you share the image of the noise signal if you have?
    One possible cause i can think of is the High frequency noise source nearby. Have you analyzed the Noise characteristic? You can perform simple FFT to identify the noise source by switching ON and OFF of the nearby lights or machines etc...
    One more way is to move the measurement setup out of the current location.
    I guess there shall be a better way of identifying the Microphone connectivity rather than comparing the floating signal RMS with the sound pressure threshold level for identification. 
    Thanks,
    Vijay.

  • PXI-4462 settings...

    Hi All!
    Is it possible:
    1. Set gain for particular channel using DAQmx Channel -> AI.Gain properties instead max/min voltage?
    2. Set DC offset for particular channel using DAQmx Channel -> AI.DCOffset properties? What units of this offset?
    3. What properties control LP analog filter? Or this filter always ON? May be this filter controlled by writing F/T to the AI.Lowpass.Enable properties?
    Jury

    Hi Jury,
    Yes.  This article should be helpful.
    DSA modules like the 4462 will remove a DC offset automatically when AC coupling is selected.  You'll select AI.Coupling as the property to write in your DAQmx Channel property node.  You will not be able to enter a value for the offset.  Related info, here.
    The anti-aliasing filters on DSA devices are not configurable through a property node.  They automatically adjust with sampling rate to follow the Nyquist frequency.  The AI.Lowpass.Enable is not a property supported by these modules.
    Kyle B  |  Product Support Engineer  |  ni.com/support

  • PXI-4462 actual sample rate and delay...

    Hi All!
    Is the DAQmx properties, which give me actual sample rate and filter delay? Or I must manualy calculate this values, as described in DSA manual?
    Jury

    Hi Jury,
    I am not sure if I fully understand your question, but there are DAQmx properties that do return the actual sample rate, but there is not one for filter delay. If you place a DAQmx Timing property node down, the actual sample rate will be returned by selecting Sample Clock » Rate.
    Regards,
    Jason D
    Applications Engineer
    National Instruments

  • Conductanc​e measuremen​t using NI PXIe 4492

    Hello,
    I am applying AC voltage using NI PXI 4462 card and measuring the voltage output from my device using NI PXIe 4492. I use Lockin program to measure the amplitude voltage of the signal acquired. I need to convert this output voltage/amplitude into conductance but don't know how.
    Any assistance to solve this problem is appreciated.
    Thanks,
    Mangesh

    Hello Mangesh,
    The 4496 is a 16 channel AI module and the 4462 is a 4 channel AI module, so you will need a module to source the signal. Where is the AC signal coming from? You could set one of the channels to measure current with a shunt resistor and another channel to measure voltage. If you have those two measurments synchronized, you can calculate conductivity from there (assuming the modules have enough accuracy for the application). The delta-sigma ADCs of the 4492 and 4462 may not be ideal for measuring conductance, but will work for the lock-in amplifier.
    A DMM would be the best in terms of DC accuracy. If you're just looking for DC conductance, you would use a DMM to measure resistance and take the inverse for conductance. 
    Jake H | Applications Engineer | National Instruments

  • How do I get started with PXI timing?

    I'm working in a lab that is trying to start to use a National Instruments PXI/VXI hybrid system.  I currently know very little about timing and triggering.  Basically all I know is that the timers we are using (PXI-6653) generate a square wave at 10 MHz and I can route it to the CLK10_in.  I'm able to confirm that the clock is being routed there by using some of the example VIs and using a scope to see that the square wave is being outputted through the BNC connector on the back.  I can see it's not the regular PXI 10 MHz reference clock because there is a difference in 10 MHz signals between before I hit the "GO" button on the routing VI and after I hit the "GO" button.  So all in all, I can confirm I'm getting the 10 MHz signal routed to the CLK10 backplane signal.
    However, my main question is how I can use that CLK10 signal on my DAQ cards?  We are using PXI-4462 and PXI-6123 cards.  I'm trying to use some of the example VIs given with NI-DAQmx.  Is the "onboardclock" a timer that's on the DAQ card itsself?  What about this sampleclock?
    I've read through the examples and tutorials on the NI website, and they aren't very "newbie-friendly". 
    Thanks,
    Michael 

    Hello Michael,
    Thanks for posting on the forums!  What you are trying to do is called reference clock synchronization.  This is also referred to as Phase Lock Looping (PLL) to a reference clock.  You will access this reference clock with a DAQmx property node as shown below.
    Your PXI-4462 is a DSA device.  This needs to be the Master device.  Take a look at the Synchronization examples that ship with LabVIEW.  Launch the NI Example Finder by going to Help»Find Examples.  Browse by task to Hardware Input and Output»DAQmx»Synchronization»Multi-Device.  The image above comes straight from the Multi-Device Sync-AI and AO-Shared Timebase & Trig-DSA.vi  example.  You can modify this example to suit your application.  But remember, the DSA device needs to be the master.
    You may be wondering what the Sync Pulse is for.  In addition the the NI Example Finder, the NI-DAQmx Help is a great resource.  Do a search for Sync Pulse, and you will find quite a bit of information about it as well as other useful things to know and consider with DSA synchronization.
    Message Edited by RT4CY on 10-25-2008 03:06 PM
    Rod T.
    Attachments:
    refclock.jpg ‏110 KB

  • Function control of the PXI system

    Hi All!
    We order  NI PXI-1036DC + PXI-4462 + PXI-6682 GPS + PXI-6653 + PXI-8101.
    Is it possible to control:
    1. DC voltage and current?
    2. GPS coordinates of the system?
    3. Accuracy (or quality) of the 10 MHz clock disciplining by the 6682 GPS? It may be accuracy of the GPS positioning or number of satellites.
    4. Temperature? It may be processor temperature.
    Jury

    Hello Jury,
    Thank you for bringing this issue to the forums.
    Regarding your questions:
    1. What do you want to control the DC voltage and current of? Which card exactly?
    2. I am not exactly sure what you mean by controlling the GPS coordinates of the system. Can you please explain further? 
    3. You can find the specifications of 10 MHz clock and accuracy of the GPS on page A-5 and A-6 of the PXI-6682 GPS Manual: http://www.ni.com/pdf/manuals/372292b.pdf
    The 10 MHz clock accuracy is +/- 1 ppm, you cannot change this value. The accuracy of the GPS is within 15 ns, you cannot change this value as well. Once again all this information can be found on page A-5 and A-6 of the PXI-6682 GPS Manual. 
    About the number of satellites, the more satellites available to the receiver, the more precisely it can determine time and location. Therefore, the location of the antenna should be such that it will receive signals from the greatest number of satellites possible.
    4. The +/- 1 ppm accuracy of PXI-6682 is specified in the range of 0 to 55 C.
    Thank you,
    Vimal Fernandez
    Applications Engineer
    National Instruments

  • PXI 4472 DAQmx Start VI taking a long time.

    I have an issue with DAQmx Start taking up to a secoond to to execute and it's killing my cycle time.
    I have a PXI 8360 with 3 PXI 4462's and 3 PXI 4472's.  I configure DAQ Task and Commit at the begining of the sequence however every time i do a DAQmx Start it takes about a second to execute.  I need to do about 5 in each Test sequence so it's eating up about 5 seconds of cycle time.  I am using DAQmx 9.7.5 drivers and Labview 2013.  We have the exact same hardware and software setup in another location but we are not seeing this issue there.
    Any ideas what might be causing this would be appreciated.
    Attachments:
    DAMmx Start.png ‏4 KB

    Hi Nathan,
    I verified this by disabling the Start Task VI.
    I've attached the commit code.
    Thanks
    Attachments:
    PXI 4472 Acquire.png ‏8 KB
    PXI 4472 and 4462 Commit.png ‏13 KB

  • Can't install NI-sync and others on PXI-8101RT

    Hi All!
    I have PXI-1036DC + PXI-8101RT + PXI-6682 + PXI-6653 + PXI-4462 + PXI-6143. I try to install NI-sync 3.3.5 and Multifunction DAQ & DSA 9.7.0 on 8101RT and obtain the message, that this components requires MIG String 2.3.0.
    What is the MIG String and where can I take it?
    Jury
    Solved!
    Go to Solution.

    Hi,
    Which version of LabVIEW are you using? I noticed that NI-SYNC 3.3.5 is supported for LabVIEW versions 2009 and above.
    Try to navigate to C:\Program Files (x86)\National Instruments\RT Images\NI-DAQmx, open the file nimigString.cdf with a text editor. If the version is 2.2.1 then modify it to 2.3.0.
    If you are not able to find the previous file, try to install DAQmx first.
    Regards,
    MCOTO

  • How many DSA Cards can be simultaneo​usly Self Calibrated​?

    I have two PXI-1045 chassises connected to a single computer via a dual port MXI Express card.
    Each of the two chassises have 12 PXI-4462 4 channel DSA cards.
    I am using the "DAQmx Self Calibrate.vi", which takes about 156 seconds.
    It appears that if place 24 of these DAQmx Self Calibrate VIs on my block diagram,
    then it appears that 4 will finish after 156 seconds, then another 4 will finish after
    another 156 seconds, and so on, until all are finished after a total of 936 seconds.
    I have  found that 1, 2, 3, or 4 can be simultaneously self calibrated, but more than that requires additional time for each group of 4.
    So my question is, is it possible to sell calibrate more than 4 at once?
    My computer is a quad core, but I don't think this is the limiting factor.
    Could it rather be some other resource, such as Triggers on the PXI bus, that are the limiting factor?

    Hey Kevin,
    The problem you are running into is likely caused by the fact that LabVIEW allocates a default of 4 threads per priority per execution system.  DAQmx VIs by default run at the same priority and execution system as their caller (despite the existence of a "DAQ" execution system), so they are probably running at normal/standard:
    While a .dll is being called by LabVIEW the thread is reserved.  So, 4 parallel calls to DAQmx Self Calibrate.vi (which call into nilvaiu.dll inside the subVI) will reserve all 4 threads that LabVIEW has allocated to the normal/standard priority and execution system.
    To raise the number of threads that LabVIEW allocates, add the line "ESys.Normal=24" or whatever number you'd like to LabVIEW.ini.  You might also have to run threadconfig.vi (instructions found here).  The end result should look like this when you run threadconfig.vi (you'll have to restart LabVIEW after editing the .ini file):
    You could technically just use threadconfig.vi to set the number of threads without manually editing the .ini file, but this only lets you allocate up to 8 threads per execution system per priority.  The number shown in < > is two higher than the actual number of threads allocated due to how the enum was defined in the vi.
    Best Regards,
    John Passiak

  • How to write data from 24 bit card DAQ card unscaled

    Hello
    I have a PXI 4462 Data acquistion card to record data. It is 24 bit card. I have two questions about writing data from this card.
    1) When acquiring the analog signal the card changes the analog to digital and when writing it scales back to analog signal. I want to write the analog signal in the digital form. How can i do that.
    2) PXI 4462 is a 24 bit card, but there is either 16 bit or 32 bit when writing it. So if i write it in 32 bit a byte is not used. only 3 bytes will be used to write the data and one byte wont have any data in it. It takes space on the hard disk. Is there any way to save this one byte so that I will be able to write just 24 bit data without loosing that one byte which would save me plenty of space.
    The sampling rate is usually 96Ks/sec.
    Thanks in advance
    Regards
    Nitin

    If you want to write 24 bits instead of 32, then you have to change the hi(x) to 8 bits instead of 16. The lo(x) will stay at 16 so the 8 plus 16 equals 24 bits. Simple arithmetic. You asked how to get rid of the upper 8 bits and if you leave it at 16, then you haven't gotten rid of anything.
    Why do you think you have to write to separate files? I said do a write of the 16 bit and then a write of of the 8 bit component. It's just two Write File functions to the same file. You could also bundle them together and do a single write but I think there would be a little additional overhead with that.
    Message Edited by Dennis Knutson on 04-06-2006 07:15 AM
    Attachments:
    write binary.JPG ‏5 KB

  • Triggering With DAQmx

    Hi,
    I have a PXI-7344 and PXI-4462 and use LabView 7.0. I would like to automate data acqusition of an analog voltage signal with the stop and start of a short one-axis move. I am trying to use breakpoints to accomplish this with the RTSI 0 line. However, I receive an error (#89139 at DAQmx start task.vi). It lists the  possible reason that "there are no shared trigger lines between the two devices that are acceptable to both devices".  Any idea what's going on here? I've configured this application multiple ways. Any advice on how to set this up or trouble shoot would be appreciated. VI attached.
    Thanks,
    ROB
    Attachments:
    sample for NI.vi ‏169 KB

    This error could happen if you don't identify the type of your PXI chassis in MAX. Please follow the steps in described in this document from our knowledge base.
    Best regards,
    Jochen Klier
    National Instruments Germany

  • How DAQmx Create Channel for Accelerometer will convert the voltaage signal into g

    HI all,
    I want to know about DAQmx Create Channel for Accelerometer hoe it will do the convertion any one reply me
    Regards,
    Santhosh M

    Most of the accelerometers that i have used till now are ICP devices.
    They need about 5mA current to power them selves up. Other wise they give inaccurate output.
    I guess you are measuring a raw time domain vibration signal.So you just need to 
    I have attached my own  code of how i acquires a vibration signal usin PXI-4462 and 4461 modules. Keep it secret till i do my thesis .
    You have to specify channel name ,device name, and remember to create the channel using the AI-accelerometer -accelerometer VI ,if you use any other form of this polymorphic vi then ICP source options will not be there and your sensors will not have the current to work properly.
    Attachments:
    New Microsoft Office Word Document.pdf ‏126 KB

  • Synchronise AI and DO tasks

    Hi,
    I have an application where I need to start an AI task (on a PXI-4462) at the same time as I write either a 0 or 1 to a digital output line (on a PXI-6229 M series daq).  This sounds like it should be really simple to do, but I can't figure it how to get one to trigger the other.  I tried using the ai start trigger signal as the trigger for the digital output task, but I get an error saying that the start.trigtype property is invalid for the task type.  Doing it the other way (AI triggered off of DIO), I can't find a suitable signal - there is no start trigger.  The only one I could find that sounded appropriate was the change detection event signal, but this never seems to go high.
    What am I missing?  How do I synchronize the start of these two tasks?
    Thanks for any help

    Lila,
    I was looking over my advice to you this morning and I realized that I was
    actually mistaken.  It's true that you won't be able to trigger a digital
    task, but it is still possible to accomplish what you described.  You can
    source the sample clock for the digital output from the counter, which is
    triggerable.  When an analog input is started, you can trigger the counter
    using a digital edge, which will then begin the digital output. 
    Try the attached sample code that I just wrote.  I tested it with a 6259,
    but it should work equally well with a 6229.  Launch the program and set
    the button to the state of the digital line you desire when the acquisition
    begins.  Flip the toggle switch and the analog input task should start, at
    which point the counter begins, thereby starting the digital output task. 
    It's a little convoluted, but all the timing is done in hardware, which means
    that it will be extremely accurate.  The digital output has to be either
    continuous or finite even though it sounds like you only need it to be either
    high or low because it must be correlated in order to be driven by the counter
    output.
    I hope this makes sense and does a better job of addresses the questions you
    were having.  Let me know if you have any questions or concerns.
    Elijah Kerry
    Senior Product Manager, LabVIEW
    Follow my Software Engineering for LabVIEW Blog
    Attachments:
    Trigger DO from AI.vi ‏60 KB

Maybe you are looking for