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Multifunction DAQ | Forum profile
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Forum profile page for Multifunction DAQ on http://www.ni.com.
This report page is the aggregated overview from a single forum: Multifunction DAQ, located on the Message Board at http://www.ni.com.
This forum profile page summarizes the general forum statistics such as: Users Activity, Forum Activity, and Top Authors, which are reported in either a table or graph below for a given reporting time period.
Additional forum profile information for "Multifunction DAQ" on the Message Board at http://www.ni.com is also shown in the following ways:
1) Latest Active Threads
2) Hot Threads for Last Week
Warning: These statistics are generated using 'best efforts' and can experience delays and reporting errors at times. Please note that such statistics do not constitute a forum's popularity and/or exact posting volumes at any given reporting period.
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Posting activity on Multifunction DAQ:
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Week
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Month
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3 Months
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Threads:
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99
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432
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1,366
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Post:
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183
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748
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2,377
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Multifunction DAQ Posting activity graph:
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Top authors during last week:
user's latest post:
I have 64Bits XP and my NI...
Published (2009-12-04 22:41:00)
XP 64 is not a supported OS for DAQmx. I don't think NI supports it for anything, including LabVIEW.
user's latest post:
How is multiplexing accomplished...
Published (2009-12-04 17:35:00)
Hi Amy, Welcome to the forums! It sounds like you are experiencing what we refer to as ghosting . Do you mean that the output impedance of your electrodes is between 100K and 10 M ohm? If this is the case, then this would explain the behavior you are seeing. You can refer to the link I posted for more information, but essentially the high source imepdance will increase the settling time of the instrumentation amplifier to the...
user's latest post:
Generating 4 analog output...
Published (2009-12-02 12:52:00)
Hi John, The vi has been modified according to you suggestions. Now it is generating AO and DO in sync!!!. There might be few modifications required in future, if i have any questions i will post back them in this thread. Thanks a million!!! Regards Viswa
user's latest post:
improve the hysteresis loop -...
Published (2009-12-04 06:40:00)
Thank you very much Henrik for your explaination. I thought the problem is due to the unstable voltages measured at the primary and secondary side of the ring core. Do you have any idea how to make the hysteresis loop more smoother and static?
user's latest post:
How do I wire my omron encoder...
Published (2009-12-01 11:25:00)
The telephone help desk of NI Singapore suggested that I use pull-up resistors. I used three 1k Ohm resistors wired between the following pins. Pin 1 - 1k Ohm - Pin 4 Pin 2 - 1k Ohm - Pin 4 Pin 3 - 1k Ohm - Pin 4 As pin 4 is the +VDC and the pin 1 - 3 are the phase it must be increasing the signal some how. All I know is it seems to work. I'm Happy
user's latest post:
Sampling rate of 5133 -...
Published (2009-12-01 04:35:00)
Then, you can divide sampling period by actual sample rate property of niScope to find out what is an actual record length you should have.
user's latest post:
Measuring 16V using external...
Published (2009-12-01 09:23:00)
Alright, the buffer worked to seperate the voltage divider from the controller. Thanks for all the help! Kind regards, Dennis van der Voort
user's latest post:
.stop takes a long time using...
Published (2009-12-04 15:35:00)
Hi Henry, It sounds like you want to cancel an asynchronous read before it is complete, but you want it to return any data that it read. As far as I know, the asynchronous read functions in the DAQmx .NET API do not support this. Here are some other options and techniques that may help: You can perfom non-blocking reads. There are two ways to do this: Use the DaqStream.AvailableSamplesPerChannel property to determine how many samples...
user's latest post:
improve the hysteresis loop -...
Published (2009-12-04 02:03:00)
Hi siti, I think 1kHz sampling rate should be sufficient for 50Hz signal, no aliasing occurred. I can't find any reason why the signal looked coarse except that because the signal itself is coarse. Meanwhile for the point is not origin, because you are plotting XY Graph, X components is from Analog Input Channel 0 and Y components is from Channel 1, and the first set of XY data is not 0, so that is why it is not pointed at the origin....
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Latest active threads on Multifunction DAQ::
Started 1 day, 5 hours ago (2009-12-07 07:22:00)
by muks
See the link described in this discussion
Started 3 days, 14 hours ago (2009-12-04 22:41:00)
by Dennis Knutson
XP 64 is not a supported OS for DAQmx. I don't think NI supports it for anything, including LabVIEW.
Started 3 days, 14 hours ago (2009-12-04 22:31:00)
by Dennis Knutson
The first version of LabVIEW with DAQmx support is 7.0 . There is no way to get a 5.0 program to use DAQmx. You would have to upgrade your version of LabVIEW and rewrite the code since there is also no way to use traditional DAQ functions with that card.
Started 21 hours, 28 minutes ago (2009-12-07 15:23:00)
by B.E.Z.
Hello Jim, Thank you for using NI forums. What version of DAQmx are you using. Since Windows 7 is a newly released OS only our lastest DAQmx driver supports it. NI-DAQmx 9.0.2 now has added support for Windows 7. Please let me know if you are still encountering problems. Regards,
Started 3 days, 19 hours ago (2009-12-04 17:35:00)
by John P
Hi Amy, Welcome to the forums! It sounds like you are experiencing what we refer to as ghosting . Do you mean that the output impedance of your electrodes is between 100K and 10 M ohm? If this is the case, then this would explain the behavior you are seeing. You can refer to the link I posted for more information, but essentially the high source imepdance will increase the...
Started 3 weeks ago (2009-11-16 17:11:00)
by Brad K
Hi Henry, What device (e.g. USB-6229, USB-9211, USB-6008, SCXI-1600, DAQPad-6020, etc.) and driver (NI-DAQmx, NI-DAQmx Base, Traditional NI-DAQ) are you using? Could you describe what you mean by "the input stream will become null?" Are you getting an error message? If so, please post the actual text, including the error code. Brad
Started 3 days, 21 hours ago (2009-12-04 15:29:00)
by John P
Hi Andrew, Depending on which Distro you are using there will be a few options . I recommend going with DAQmx if possible instead of DAQmx Base since it provides access to more of the hardware's functionality. You also might want to check out our Linux User's Group for Linux-specific issues (installation etc.). Best Regards,
Started 4 days, 1 hour ago (2009-12-04 11:34:00)
by Dennis Knutson
As noted here , DAQmx requires LabVIEW 8.2 or greater. Also see this post from yesterday.
Started 4 days, 4 hours ago (2009-12-04 08:30:00)
by __behemot_
Started 5 days, 2 hours ago (2009-12-03 10:20:00)
by Dennis Knutson
Post either an image or the actual VI. Do not post something hidden in a file with a proprietary format (docx).
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Hot threads for last week on Multifunction DAQ::
Started 5 days, 2 hours ago (2009-12-03 10:20:00)
by Dennis Knutson
Post either an image or the actual VI. Do not post something hidden in a file with a proprietary format (docx).
Started 1 month, 1 week ago (2009-10-30 15:57:00)
by elahetal
Hi, first sorry I do not know your answer but I need your help as I am beginner using DAQs. My question may seem elemenatry but I appreciate your help. Consider I use virtual instrument and a DAQ as well as signal conditioning to generate pulse wave. Using the DAQ and virtual instrument means that without a real pulse generator, I can have a pulse in output my DAQ that I can ...
Started 1 week ago (2009-11-30 21:17:00)
by KateB
I've an experience with lousy encoder reading. In most case, connecting a +5V from 9411 supply it to an encoder will solve the problem. Have you tried it?
Started 1 week ago (2009-12-01 07:05:00)
by Norbert B
Dennis, DennisVoort wrote:[...] the card should be able to measure a 20V difference, [...] This is not true. The device is capable of measuring differences between + 10 V and - 10 V between two different wires. This makes an amplitude of +-10 V for the signal. It might alternate up to 20 V in total, yes, but the difference between wire + and wire - never exceeds |U| = 10 V. ...
Started 1 year, 1 month ago (2008-11-05 01:25:00)
by Proven Regular VI Guy
Two major problems (and, um, several small ones, but that's just cause your new to this). 1) Data Flow Control: You have none. If you don't tell LabVIEW in what order you want things to run, it'll choose for itself, and it probably won't what you want. The error cluster is a very good way to impose some flow control. 2) You're not cleaning up your DAQ Tasks. A fixed VI ...
Started 3 weeks ago (2009-11-16 17:11:00)
by Brad K
Hi Henry, What device (e.g. USB-6229, USB-9211, USB-6008, SCXI-1600, DAQPad-6020, etc.) and driver (NI-DAQmx, NI-DAQmx Base, Traditional NI-DAQ) are you using? Could you describe what you mean by "the input stream will become null?" Are you getting an error message? If so, please post the actual text, including the error code. Brad
Started 6 days, 5 hours ago (2009-12-02 06:52:00)
by Dennis Knutson
The original program must not have used a 6009. The DIO Port Config is part of the old and obsolete Traditional DAQ driver and the 6009 can only use the DAQmx driver. The old program will need to be rewritten to use functions from DAQmx.
Started 1 week, 2 days ago (2009-11-29 09:37:00)
by Dennis Knutson
Look at the sound card examples. There's even Express VI called 'Acquire Sound'.
Started 6 days, 5 hours ago (2009-12-02 07:51:00)
by Simo_84
Dear Yawgmoth, I'm sorry but linux trustix is not officially supported by National..here you can find a list of supported versions of linux: http://www.ni.com/linux/support.htm#1
Started 1 week, 5 days ago (2009-11-25 18:43:00)
by KateB
Since you don't explain your problem clearly, I guess you wish to know available sampling rate of 5133. Well, its maximum is 100 MS/s, and you can divide it by integer to get a lower sampling rate down to 1.526 kS/s which is 65536 division.
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