How properly using USB 6251 to measure the DC voltage

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• How to properly connect USB-6251 to measure the DC voltage

  Hi all

  I have a problem as in the http://forums.ni.com/ni/board/message?board.id=170&message.id=404676&query.id=250408section.

  I'm sorry for the repetition of the subject, but I read all your advice and have not yet solved the problem.

  My task very simply: I use USB-6251, differential mode to measure the voltage of the battery (Energizer) 1, 5V (I connect AI0 pole positive and AI8 to the negative pole). But result shows > 10V and Mean.vi shows greater 4V (see attached photo).

  I do not understand what happed with my task?

  Please help me!

  Thank you very much!

  MC

  You have a floating signal source. Have you connected resistances to remove polarisation currents? Look at Table 1 at this link and make sure that you connect the wires in this way:

  Wiring and considerations of noise for analog signals

  You mention that you use differential channel AI0 again I can see that you measure AI4 on your façade. Have you tested the Max connection? Are what kind of reading you there? Don't forget to select the continuous Acquisition and acquire 100 samples to 1000 Hz. display a snapshot of the reading you get there.

• Can we average channel error using multiple channels to measure the same voltage?

  I don't know how correlated error terms are between measuring channels max, but it occurred to me that, if they were relatively independent, I might be able to sample the signal even with several channels and increase accuracy.

  For example, rather than measure a voltage with an AI only at 100 kHz, I could connect up to 10 different lines to HAVE the signal, sample to 10 kHz on each line.  This should allow to reach me on average some of the error associated with each channel (, or so I think).

  Can someone speak definitively to this?

  Thank you

  Sean

  Well, if you are using a MULTIPLEXED Board (everything is not specced for simultaneous sampling) then each channel is connected to the ADC even one after the other, best that you would be able to do is extremely, extremely small variations into the paths of each channel of the multiplexer.  This would still be massively overshadowed by the inherent noise from the system and the accuracy of the device.

  Your best bets to reduce the measurement error is to oversample in one way to reduce the effects of noise and to calibrate the unit before starting each test to keep variations of temperature.  In addition, make sure you keep your calibrated Board (most of the boards have a calibration 1 year of the cycle).

  For some applications, you should also consult wiring field and considerations of noise for analog signals, How to eliminate ghosting of my measurements? and Troubleshooting unexpected tensions, floating or crosstalk on Analog Input Channels to better account for ghosting and the issues of the hour.

• How to use windows search to search the contents of a bunch of files with random names / extensions?

  How to use windows search to search the contents of a bunch of files with random names / extensions? Plain txt files say 1,000 with random name of file extensions?

  You can always search within those, but you need to add extensions to the file system so that it knows to look inside these files.  You said that you have a lot, so it's perhaps tedious.  Here's How to search within several types of files.

  One thing you could try is rather to make a copy of this file, rename all the files to the same extension (even an extension false for example something.bill) and perform your search on this band.  Just an idea.

• How to use a form created on the Capture of a vector

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  Hello Cristina,

  In Illustrator, simply drag the shape of your library panel in an open document. That's all there is to it.

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• How to use setViewportBounds (Bounds value) to the ScrollPane?

  How to use setViewportBounds (Bounds value) to the ScrollPane? This method is, visually, what for? I tried to put a specific Bounds.minY to have a precise scrolling in the axis Y in vain. I use the setVvalue() method to scroll, but it is not convenient to exactly locate a position in the coordinates of the node content listed in the scroll pane.

  The viewportBounds are the limits of the viewport (i.e., the visible part of the content) in the scrolling pane itself, if I understand correctly. The way to access programmatically is by setting the vValue property.

  I have not tried, but if you do something like

  scrollPane.setVmin(0);
  DoubleBinding vmax = new DoubleBinding() {
       { super.bind(scrollPane.viewportBounds(), content.heightProperty()); }
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  to configure your component to scroll, then you can call setVvalue (...) and just pass a location of coordinates for your content node. This assumes that your content node is a region or a control; you will have to perhaps a little logic in the method computeValue() to deal with the cases where the display window is greater than the additional content.

• How to use USB CAN 8473, code for the basic example

  Hi all.

  I use NEITHER USB-8473 CAN transmit and receive data via CAN.

  I have traveled a lot a lot of pages related to this and realized that the API will not work for USB - CAN. Can someone tell me please how to use this USB-8473.

  Maybe an exaple program would help me. (It is not PCI it we USB,)

  Thank you.

  You will need to install NI-CAN, if you don't have already done.  This is the API that you can use with a 8473.  After installing, open Explorer Measurement & Automation and make sure that you can see the 8473 under your devices.

  Here is a sample VI (LabVIEW 2009) that I wrote for another developer to make the CAN communication basic tests.  You enter a package CAN as a series of hexadecimal bytes separated by spaces, and it will send it to you.  It displays every CAN packet it receives in the same format.

• How to use an internal counter of the cDAQ-9172 for measure PWM and generate the frequency?

  Hello

  Requirement of my project is to measure 6-channel PWM and generate 5 frequency channels.

  Suggestion of engineer OR bought cDAQ-9172 chassis and NI 9423 (8 DI correlated) and NI 9474 (8 correlated DO) for this requirement. I have a few questions

  Article:

  1 > what should I know to customize my CompactDaq 9172 chassis

  http://zone.NI.com/DevZone/CDA/tut/p/ID/9367

  I know that this way to synchronize the physical support 32 correlation system pin o for housing 1-4.

  => I'm not really sure how to use these channels synchronization support.

  2 > using internal counters on one NOR cDAQ-9172 as a sample for other tasks clock

  http://digital.NI.com/public.nsf/allkb/ADFC4DD8C9690232862575B70079FBD4

  I know that I can change the ownership of the physical channel so I can get 2 meter outside the frame 6 and 7.

  => I do not think that this solution will be me because I can use only 2 counters with this method.

  Could someone tell me please how to fix my project requirement? How to choose the setting for DAQmx screws?

  I have experience with measure the PWM and generate the frequency, but with separated against only.

  Best regards

  Thang Nguyen

  Hey Thang.

  AHA... for this, you can use the channel property node.

  

  See you soon

  Lab

• How to use DAQmx Read to measure several analog channels

  I have two analog inputs using USB 6221 and I want to measure the voltage of each of them.  I use vi DAQmx-read and I select input analog, 1 sample, several channels, but I do not know how to connect several channels at the entrance of the physical channel.

  Hello, Bernadette.

  For reference - I would recommend ad DAQmx questions here:

  NEITHER Forums: Multifunction Data Acquisition

  http://forums.NI.com/T5/Multifunction-DAQ/BD-p/250

  There are several ways to add multiple channels for a fast task-ni.com look for "select multiple channels DAQmx" gives me this like the hit albums:

  2X8D7F5Z knowledge base: How can I select more than one channel of NOR-DAQmx LabVIEW?

  http://digital.NI.com/public.nsf/allkb/A3A05920BF915F1486256D210069BE49

  Hope that helps!

• Not recognized USB-6251 (detected) to the MAX but is detected by the Windows 7 Device Manager

  Does anyone have a solution to our problem?

  USB-6251 is not recognized (detected) in MAX but is detected by the Windows 7 Device Manager.

  Is our configuration: Windows 7 (64-BIT), DAXmx 9.3.0f2, MAX 4,8 and USB-6251 (S/N 12B647A. P/N 194929 D - 04 L)

  We had a 'ready' indication/led the 6251.

  We tried several things... (all do not work)

  1. we have installed DAQmx 9.3 (for Windows 7)

  2. clean MAX Database by the following

  http://digital.NI.com/public.nsf/WebSearch/86256F0E001DA9FF86256FFD005B827C?OpenDocument

  Michael B.

  Yes the 6251 appears as a DAQ hardware.  Device charger OR placed in the auto-start services window.  We have refreshed MAX.

  Success!  I had to manually start the device loader.  Even if the service has been set to autostart, it did not work.  Right-click on the service shows that the beginning was selectable.  Click Start and the service began.  Start to MAX and can now see the device.  Open the front panel.

  How does the monitor devices OR running in the interface of the status bar to the device loader service?

  I don't understand why the service was not working.  Is it a security issue?  I am logged in as administrator.  I'll try once again as a normal user.

• How to use an option button in the report of the IR to redirect itself to view another report

  IHH team, I have a requirement where I have an IR report option button. By clicking this radio button, another report appears under the main report with few other details of the selected item. The idea was to have a zoom of report as seen in the Group of MS Excel.  However, I am stuck because I don't want the user to press the "submit" button each time after selection of a radio button. I want the result to Report2 to change on the selection radio button in report 1.

  Please notify.

  Kind regards

  Samar

  for example

  Report1 details

  RB col_id text1 text2 Text3

  1 . abc erd 45

  2 ghj dfgrt 67

  Suppose the user selects the first option button, the page displays another report with details below the main report

  Report1 details

  col1_id text1 text2 Text3

  RB1 1 abc erd 45

  2 RB2 ghj dfgrt 67

  Report2 details

  col1_id col2_id text1 text2 Text3

  1 11 ihj pkpk 78

  1 23 ljl kpk 45

  user6255521 wrote:

  Please update your forum profile with a real handle instead of 'user6255521': Video tutorial how to change username available

  When asking a question, always include the information referred to in these guidelines: How to get the answers from the forum

  I was able to achieve using the linl. I created a link on the col_id and it redirected to itself after you set the value of col2_id. I also changed the style of the button link and so col1_id looks like a button.

  However, I was interested to know if we can achieve this with a radio button and use the update form the Report2.

  You mean like this? It is very simple to implement using dynamic measurements.

  1. Add a column of radio group to the main report:

  select
      apex_item.radiogroup(1, d.department_id) rbg
    , d.*
  from
      oehr_departments d
  

  APEX 5.0, apply a static ID "rbg" to the column of radio group.

  2. create a hidden page unprotected element to maintain the value of the selected radio button to use as a filter in the detailed report. In the example, it is P31_DEPARTMENT_ID.

  3 refer to the element of filter in the WHERE clause of the report detail:

  select
      *
  from
      oehr_employees
  where
      department_id = :p31_department_id
  

  Set the Items property of the Page to send in the definition of report P31_DEPARTMENT_IDretail area.

  4. create a dynamic action of change on the Group of radio buttons:

  Event: Change

  Selection type: jQuery Selector

  jQuery Selector:td[headers="rbg"] input[type="radio"]

  Real Actions

  Seq: 10

  Action: Set value

  Type of value: Expression of JavaScript

  JavaScript expression:$(this.triggeringElement).val()

  Selection type: Article (s)

  Point: P31_DEPARTMENT_ID

  Seq: 20

  Action: Discount

  Selection type: Region

  Region:

  The best way to get help with something like that is for you to reproduce the problem with an example on apex.oracle.com. Set up as much as you can before posting here and when you post the question, share identification information of developer comments for the workspace so that we can see the example and work the solution directly.

• 480 satellite CDT, with Windows 95 osr, how to use USB

  I guess it's impossible, but is there a solution
  thaks

  Hi, look what I found

  "What Microsoft (http://support.microsoft.com/support/kb/articles/Q247/9/69.ASP)" has to say about USB support in Win95 ".

  Excerpt from Microsoft Knowledge Base
  "Windows 95 OSR 2.1 and OSR 2.5 provide base support USB which was developed as the technology first emerged. Based on today's more mature USB technology, there are a number of limitations with USB support in Windows 95 OSR 2.1 and Windows 95 OSR 2.5.

  These limitations have been addressed in Microsoft Windows 98 and carried over to Microsoft Windows 98 Second edition. Addressing these limitations required several architectural changes that are not portable back to Windows 95 OSR 2.1 or Windows 95 OSR 2.5.
  Microsoft recommends that customers who need a more robust USB environment upgrade to Windows 98 or Windows 98 Second edition. »
  Determine if your Version supports USB
  The first thing you need to do to activate the USB in Win95 is to determine which version of the operating system that you use. Please note that the original or the first version of Windows 95, including the update and the version has, is NOT capable of USB connectivity. There is NO updates for these versions of Win95 which can provide USB support. Versions Win95 B & C limited USB functionality. The first operating system of Microsoft to fully support USB is Win98 first edition.

  I also found a link which is very interesting-> http://www.usbman.com/Win95%20USB%20Guide.htm

  Does that answer your question? ;)

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  Hello! I hope someone can answer a few questions for me.

  First of all is: How can I turn on my laptop to use all the 4 GB of RAM? OS is Win Vista Ultimate 32-bit with Service Pack 2. Now Vista all show the 4 GB of RAM, but don't use it. I activated the EAP in Vista, but still nothing. As I saw, I need to turn it on too memory remapping in BIOS but there is no option (my BIOS is ver.1.70).

  The second question relates to the BIOS. Because my version is 1.70 and there are more recent version 2.00; I get benefits if I update to BIOS? Someone has updated to version 2.00? And there are more options in the BIOS after update to version 2.00 (for example the memory remapping or a similar option)?
  I'm a little afraid to update BIOS, because sometimes my Toshiba freezes, and I would not hang during the update of the BIOS.

  And the final question is there any changelog to the BIOS? So I can see what is added and changed, and what's new in the new version of the BIOS. Because I could not find anywhere.

  Thanks for the responses to come.

  Hello!

  (1) you can use the entire 4 GB of RAM on a 32 bit OS. It is a due limitation of 32-bit technology. Windows Vista with Service Pack 2 may recognize the full 4 GB of RAM but not use it, more than 3.2 g.
  Here you can find more information about this limitation:
  http://APS2.toshiba-tro.de/KB0/TSB82022E0000R01.htm

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  Update the BIOS doesn't normally contain new features or options. It s bug just setting. In addition it can t solve the problem with 4 GB of RAM and Vista 32 bit if you think that ;)
  If your laptop does not have 100% stable you shouldn't t update because it s too risky. Before the update, you should try to solve the problem of gel.

  (3) If a change log is available you can find it on the Toshiba site. If you can t find, there isn t available.
  That s all about this.

  I hope I could help a bit.

  Good bye

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  Hi all

  Using maxon EPOS 2 (positioning system easy) to order the EC motor. It comes with Windows 32 - Bit DLL for labVIEW. How to use these anointings of library in labVIEW correctly? When I try to call the function of library in a LabVIEW program, it shows me a warning about a caller and if the Subvi is not executable. Do I have to change the location of files library or make any other change?

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