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NICAIU.DLL missing after update

April 1, 2019, 8:02 pm
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After installing the latest update NIDAQmxBase1500.exe on a windows 10 system a command line utility failed with a message that NICAIU.DLL was missing. This is a DAQmx application which has no .NET or other user interface. It is written in streight C using Visual Studio and had been working. I believe the last working version was NIDAQ1610f3.exe

I am assuming that NIDAQmxBase1500.exe was the wrong thing to use.

I can't find anything on the NI site that is a newer version of NIDAQ1610f3.exe, Does it exist?

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Unexpected stop of DAQ continuous sampling

April 2, 2019, 9:40 pm
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When I performs continuous sampling task in the test panel, the task works well at first, but can't read any data after a while. (The duration is not fixed) Then, if I press the stop button, the device (NI-USB 6229) will restart by itself. I don't know why.Smiley Sad

 

Thanks for your help!

 

Bob.

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NI USB 6361 NOT TURN ON

April 3, 2019, 1:20 pm
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Hello,

my NI, when it is turned on, the led flashes and will not turn on. My desktop does not recognize the usb cable anymore, apparently it is off. Possibly it has received a voltage of 220V on an RSE signal cable or differential. Does the NI 6351 have any security features? Could it have spoiled if you received a voltage across a signal cable?

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Using NIDAQmx cfg_samp_clk_timing in python 3.6

April 4, 2019, 2:36 am
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Are all NIDAQmx functions available to all NI multifunction devices? If not, how do I determine which functions apply to which device? Thanks.

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DAQ Assistant express VI for NI USB 6259 on NI myRIO VI

April 4, 2019, 6:31 pm
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Hi All,

 

I am new to the LabView platform and I am using a Pmod ACL that is hooked onto the NI myRIO device and a piezoelectric force connected to an NI USB 6259 DAQ board. Is there a way to use the DAQ Assistant Express VI in a myRIO VI so i can collect ACL and Force measurements readings simultaneously with a common timestamp?

The ACL VI running on the myRIO does not seem to recognize the DAQ board.

 

 

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Any simple methods for measuring bike wheel cadence using wires and not bluetooth or ANT+ etc?

April 4, 2019, 7:41 pm
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Hi everyone,

I am doing an exercise study and need to measure bicycke cadence... In the event I am unable to tap into the bike electronics and access the raw data signals, would any have any suggestions for how I caouls measure cadence using a bike cadence magnet or other simple device?... My LabvIew system and DAQ is aging and a wireless set-up will not likely work... Any suggestions would be greatly appreciated..

Thanks!

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Cannot install offline viewer for html docs. I have a Win 10 workstation and do not have admin rights to install.IT will not allow app to be installed. Where is the pdf version of DaqExpress 2.0 manual?

April 5, 2019, 8:10 am
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Cannot install offline viewer for html docs. I have a Win 10 workstation and do not have admin rights to install.IT will not allow app to be installed. Where is the pdf version of DaqExpress 2.0 manual?

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Problem with NI USB-6008 using Qt on mac.

April 5, 2019, 12:19 pm
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Hello, I am doing a program to acquire data through an NI-6008 in macOS high Sierra 10.13.5, I am using Qt Creator 4.7.0 (Qt 5.11.1 (Clang 8.0 (Apple), 64 bit)) and NI- DAQmx Base 15.0.0. The problem I have is that when I run the program it closes unexpectedly without sending an error message. I have the doubt if the path to the library is correct, since I did not find any .a files.The instructions I have to connect to the NIDAQ library and the NI-6008 are the following:

 

File .pro.

INCLUDEPATH +="/Applications/National Instruments/NI-DAQmx Base/includes"

LIBS += /Library/Frameworks/nidaqmxbase.framework/Versions/15/nidaqmxbase \

       /Library/Frameworks/nidaqmxbaselv.framework/Versions/A/nidaqmxbaselv

 

or

INCLUDEPATH +="/Applications/National Instruments/NI-DAQmx Base/includes"

LIBS += -frameworks nidaqmxbase \

                -frameworks nidaqmxbaselv

 

 

File cpp.

TaskHandle taskHandle = 0;

DAQmxBaseCreateTask("MyTask", &taskHandle);

 

Error message

12:18:17: The program has unexpectedly finished.

 

What is the error?

Any idea?

Thanks.

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What is the correct wiring of 9 Pressure Transmitter (2 wire type, 4-20mA output) on NI USB-6211?

April 6, 2019, 2:15 pm
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Details:

NI USB-6211 Analog Input Config. (p. 60/204 of the PDF)

Pressure transmitter connection diagram* (the 4-20mA diagram on p. 2/2 of the PDF)

*Translated to English = Pin 1 (supply source), Pin 2 (signal) and Pin 3 (OFF)

 

Hi!

Since I want to connect 9 sensors on a device that has only 8 differential-type inputs, I must wire them on RSE or NRSE mode.

 

First, I'll have to find out what 'AI Ground Reference Setting' my Signal Source has. How can I do that? As my power supply unit has only V+ and V- on its output, i guess it's floating, therefore my Signal Source is also floating, right?

 

Assuming it, I made two different connection diagrams of my setup, one for NRSE and one for RSE, both of them attached here. Are they correct? Which one is better, NRSE or RSE?

 

Thanks!

 

 

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Input noise floor of PXIe 6368

April 7, 2019, 3:59 am
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Hi all

I am using PXIe 6368 card and am trying to calculate self noise of each channel in this card. For this purpose, i select a differential channel, set input range to +/-5 V, short both differential inputs and performed following steps:

1. Collect 'x' no of samples of voltage signal
2. Perform FFT of size 'x' on collected samples
3. Divide each complex output of FFT by 'x'
4. Find the absolute of each complex output of FFT
5. Multiply the output of above step by 1.414 to get Vrms against each frequency bin
10. Take log10 and multiply by 20 of each output in above step
11. Add 10xlog10(x/2) in each output of step above to compensate FFT gain against noise

 

The result is self noise floor graph of a channel in terms of dBVrms Vs frequency.I got average noise floor around -68 dBVrms across frequency band.

 

Now, according to specifications of this card at page-3, it has random noise of 134 uvrms for +/-5V range scale (which in my assumption is self noise/channel of this system) which results in  -77dBVrms approximately.

 

If my method of measurement and calculations are correct and also the assumption that this card has self noise spectrum of -77dBVrms for a frequency band, there is difference of around 9 dB between measured value and theoretical value.

 

Kindly guide me whether i am doing right calculations and if i am right, what may possible reasons for this difference of 9 dB?

 

Thanks & Regards

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Extract waveform and show at two different plots

April 8, 2019, 9:10 am
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Dear Seniors,
I want to extract the waveform and show the data at 2 different waveform plot. Such as I attached the file of the waveform and this waveform is coming from the circuit and it was generated at different time scale. I mean can I separate this waveform into 2 different waveform plot. I want when the start button is press then for all RED mark data is shown on waveform plot and all blue mark data show another waveform plot and I want it continuous. Please suggest me how can I do this.
Thanks in advance

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connect TPC-2206 to cDAQ 9189

April 8, 2019, 2:24 pm
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Dear all,

I was wondering if someone has tried to connect a cDAQ module on a touch panel, such as TPC-2206. I have a cDAQ 9189. The DAQmx version currently installed on my host computer and the TPC-2206 is the 18.0 and I use Labview 2015. Basically, what I would like to do is to use the TPC-2206 to start and monitor a VI acquiring from the cDAQ that saves data onto my host computer.

Can you suggest the documentation to complete such a task?

 

thanks in advance,

Valeria

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Can I use PXI module(PXI-6722) and DAQmx(USB-6210) at the same time?

April 9, 2019, 5:22 am
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Hi,

 

Now, I'm using the USB-6210 alone for 10-channel analog inputs.

 

I want to make multi-channel analog output(at least 8 channels), then I found PXI analog output module(PXI-6722).

 

As my experience, two DAQmx-USB modules cannot use at the same time(on single labtop).

So, my question is that I can use those two modules (6210 & 6722) simultaneously with well synchronized condition?

And, for using PXI module, I have to mount it on desktop not labtop?

 

If there better option for my experiment setup, please let me know.

 

Thank you.

 

 

 

 

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cdaq-9171 and DAQmx API

April 9, 2019, 8:46 am
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Hello,

 

I have build my own program with .NET Daqmx API to use DAQ devices. It works, I can create and launch tasks for Analog/Digital input/output.

I just tried to plug a cDAQ 9171. It is detected, but device->GetPhysicalChannels() will always return an empty array, so I cannto do anything with it.

Hwoever, I I launch DAQ express, I can see that the device works correctly, and that voltage is detected on the pins.

How can I detect the Analog Input channels on that devices in my code ? Why does it behave differently than PCI or USB boards ?

 

[edit]
If I force the channels to be named cDaq1Mod1/ai0, it just works. So the question is : whay does dthe device does not report such channel names ?

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Error -200477 occurred at DAQmx Timing (Sample Clock)

April 9, 2019, 11:48 am
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The reason is: Specified operation cannot be performed when there are no devices in the task.

The VI works good in development system. How its exe vi shows this error. The VI includes usb 6001 and NI 9266 (with cDAQ-9171). The error occurs for both DAQ when execute DAQmx Timing (Sample Clock) VI. The source input of sampling clock VI is leave unwired, so the source is the default onboard clock.

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Measure RTD with SCXI-1581 and M-series PXI board

April 10, 2019, 5:04 am
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Because PXIe chassis do not allow for control of SCXI (which I discovered late), I am attempting to use the SCXI-1581 for excitation of multiple 100-ohm Pt RTDs, and a PXI-6254 for signal acquisition.  I believe the measurement is basically accurate, but it's incredibly noisy.  Digital filtering skews the reading, so that doesn't help me.  Does anyone know why I would be getting 12-Hz noise from this setup?  Is there any recommended special wiring that could help reduce the noise?  I tried tying the negative and positive signal inputs to AIGND with balanced resistors of 12kOhm, but this did not help.

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PXI-2722 3 Wire RTD

April 10, 2019, 6:15 am
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I am trying to configure my PXI-2722 Resistor Module to act like a 3-Wire RTD Sensor.

I am using Channel 0, with these Relay Positions: b0shunt = Closed, b0 = Open, bc01 = Closed, b1shunt = Open, and b1 = Closed. See attachment.

My LabVIEW program can change the resistance across Pins 2 and 20 which is what I expect.

My problem is I have an Open Circuit (infinite resistance) between Pins 2 and 1.  So my solution will not act like a 3-Wire RTD.  What am I doing wrong and how can I act like a 3-Wire RTD using PXI-2722?

 

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Avoiding onboard device memory overflow

April 10, 2019, 9:38 am
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I'm using NI USB-6356 with 64MB on-board FIFO. It is configured for AI as follows:

-8ch

-finite acquisition (~100k sample per ch)

-internal hardware clock at 1 MSPS

-reference trigger with ~10k pre-trigger points

 

My initial assumption was that DAQmx would configure  the board to use on-board FIFO as a circular buffer, overwriting old samples until the trigger, recording finite number of samples after the trigger, and stopping then. I would then read the data.

 

Turns out DAQmx driver also creates a local PC buffer and tries to stream all the pre-trigger data into PC all the time. This creates a problem - the USB link (special case vendor fibre extender) is too slow to keep up with live buffering, and DAQmx throws onboard device memory overflow error. I tried disabling PC buffer by calling configure input buffer with 0 size, as suggested in knowledge base, but it is not compatible with the configuration described above - "Non-buffered hardware-timed operations are not supported for this device and Channel Type."

 

Any workarounds?   

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NI USB-6259 BNC external Calibration

April 10, 2019, 9:51 am
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I have a NI USB-6259 BNC that I'm hoping to externally calibrate the voltage inputs and voltage outputs. 

 

I've been looking through the calibration procedure using NI-DAQmx. However it doesn't seem to have anything to say about the BNC version of the 6259 in terms of where to connect the voltage calibrator, and it talks about connecting to AI8 which doesn't seem to be on my device (at least not the front panel, could be internal).

 

So I have two questions:

1) Can I do an external calibration on this device? If so where am I connecting the calibrator and DMM?

2) It seems that I can use the DAQmx calibration VI's so is there an example of how that would work?

 

Thanks,

Tom

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Labvew - Generate Physical Channel Name from Device Name

April 11, 2019, 7:02 am
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Currently I can define the required DAQmx physical channels using an Control. Thats very straightforward.

 

But because several channels have to be selected, I would like the user to select the DAQmx device name, and then append the required channel names in the backend. 


How could that be concatenated?

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