MyRIO analog input express Vi (n samples) missing file

Dear Users,
I am trying to read analog data with an express VI in myRIO. This works with Analog input (1 sample), but fails with Analog input (n samples) due a missing file "myRIO v1.1 FPGA Throughput.lvbitx".
I googled it and searched it on ni.com, but nobody seems to have the same isssue (I suppose because of the myRIO is quite new right now)
Thank you!
Solved!
Go to Solution.

I would try doing a repair of your installation. It looks like something didn't get installed properly.
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MyRio analog input

Greetings,
I am new to NI and I have a question about the setting the timing on the analog inputs. I want to set up a clock (DIO output) and in addition, have ever clock rising edge initiate a single A/D conversion. Is this possible with the MyRio?
The background is I have a device with a string of sensors that will output a analog value every time I send in a clock, therefore I need to digitize the analog signal synchronized with the clock.
In addition, if someone has found documentation other than the manual, I would appreciate your sharing.
Thanks for the help,
Frank

Hi Frank,
Welcome to the forums! What you want to do is definitely possible with the myRIO. You have a few options available to you:
If you have the ability to upgrade to LabVIEW 2014, the myRIO 2014 toolkit includes new Interrupt Express VIs. You specify a condition (in your case, a rising digital edge) and a callback VI that executes when this condition is met. The best way to learn about how this works is to take a look at the examples in Example Finder (Help»Find Examples»Toolkits and Modules»myRIO»Interrupt Handling.lvproj.
If you don't have the ability to upgrade to LabVIEW 2014, you could implement something similar yourself by having a loop wait for a rising edge on a digital line by using the Digital Input Express VI and then doing the analog measurement. This method would introduce some jitter because of the overhead associated with the Express VIs. An example snippet of this is below. If you do have access to the FPGA module, I would recommend implementing this logic on the FPGA instead (further below).
Using the FPGA module to do the triggering would give you better results because of the tighter timing capabilites of the FPGA as compared to the Express VIs. The logic would be mostly the same on the FPGA as it is on the real-time except for the appropriate VIs swapped around:
Here, we are waiting for a rising edge on a digital line and then placing the data from the analog channel in a to provide this data to the host (real-time) application.
If you want absolute control over the synchronization of the AI to the clock, I would recommend implementing the logic in FPGA (2013 or 2014). If your application has a little leeway in terms of timing, the Express VIs (2013) or Interrupt Express VIs (2014) would work for you.
Let us know if you have any questions!
Best Regards,
Matthew B.
Applications Engineer
National Instruments

NI-MyRIO Analog Inputs

Greetings,
I'm just getting the myRIO up and running, and I'm sort of disappointed that the +/- analog inputs are differential only. Is there any low level way to use these channels differently, or at least each as single-ended? Pseudo-differential, perhaps? I'm going to have to resort to using the line-level audio inputs to measure single ended inputs and make sure the input level is lower than whatever the max voltage is for that (1.7 volts or something).
Any users out there care to comment?
I know the other inputs are single ended, but only 0-5V. Bummer.
Thanks in advance.
TR
><><><><><><
Tommy R.
><><><><><><

I grounded the 0- and 1- inputs of the two differential channels and had no problem measuring single ended voltages going into 0+ and 1+. I was just expecting to be able to configure the four inputs to be four single-ended inputs like I normally can do on all other NI DAQ analog hardware. The project I'm working on needs four measurments (all +/- voltages), so I was hoping the two +/- 10 channels were reconfigurable to four, like I'm used to. I'm just going to have to be creative and use the audio inputs as well.
><><><><><><
Tommy R.
><><><><><><

How to read data from analog input and export it to a file using Components Works

I've made a simple application (Delphi 5 using the activeX) that read data from analog input channel 0. After I read the data, I want to export it to a file using the Components Works on a 6035E NIDAQ. (I'm not using labview and don't want to use it)
How can I do that???
Regards,
Francis

Here's a sample code to do this...
P.S.: If you read only one channel this code won't work.
function MyFunction: Integer;
var
Low, High, i, j, ChannelCount, RowCount: Integer;
Po: P;
begin
//you are reading multiple channel
ChannelCount := VarArrayHighBound(Buffer, 1);
RowCount := VarArrayHighBound(Buffer, 2);
for i := 0 to ChannelCount do begin
for j := 0 to RowCount do begin
WriteToDisk(Buffer[i, j]));
end;
end;
end;

Using SDK for Embed3dData sample, missing file

I am looking through the Embed3dData Sample it needs a file Pdfinit.h...
I can not seem to find this file anywhere I have searched through all of the SDK files, is this part of the SDK or is it just missing.
Any pointers ??
Regards
Harald

Sorry just saw that the file is only needed if suing pdfl
thanks

Labview myRIO Analog data sampling rate

I have been using the myRIO to acquire audio input from a microphone.
In LabView I'm using the Analog Input Express VI to acquire the data.
I wanted to know if there was a way to increase the sampling rate of this data from this VI, or any VI at that?
Solved!
Go to Solution.

Hi ykhali,
Try putting the VI into a timed loop and set the loop rate to your sampling rate.
Regards,
Joel I.
Applications Engineer
National Instruments

Very low frequency caused by sample frequency in FFT analog input?

I'm measuring a very low frequency on my analog input, this frequency is in connection with the sample frequency of the Analog Input. At a sample frequency of 1000Hz I see a frequency of 0,05Hz in my FFT, at a sample frequency of 500Hz I see a frequency of 0,02Hz.
Attached is a screenshot of an example how I see this very low frequency.
My hardware: NI USB 6008 --> measuring on AI-0 (in this example the input is unwired). But in my real measurement I see the same FFT + signals I want to see (about 2 Hz).
In my real measurement I windowed the FFT (1-3Hz) so I see only the FFT I want to see. But I suspect that my complete signal moves along with this very low frequency of 0,05Hz. I saw this in my measerement.
What did I do wrong?
Attachments:
screenshot.JPG ‏66 KB

First, do you live in Europe? If so, that 50Hz could be power-line pick up.
Antialias filtering must be done in hardware before the DAQ. Because of the way aliasing works if you have sampled the signal it's already too late, you're hosed and no amount of digital filtering can remove the aliased signal. In terms of filter specifications, the filter cutoff needs to be at twice the highest frequency you are interested in seeing. For example, if you are looking for signals in the 2- to 5-Hz range, your antialiasing filter should cutoff at around 10Hz.
Obviously good signal management is also needed: shielding, appropriate signal termination, proper lead dress and spacing from known noise sources, etc...
Mike...
PS: There were no attachments to your last post.
Certified Professional Instructor
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ELVIS Scope and Analog input triggering

Hi everyone,
I'm trying to read two waveforms, one from the analog input and one from the scope. These waveforms are coming from two sides of a voltage divider and should always be in phase. But I think that there might be a triggering problem. When I change the frequency of the input waveform, my measured waveforms go out of phase.I have programmed each express VI to trigger off of the SYNC.
I can't use analog inputs for both measurements because the sampling rate is too small. I can't use the scope for both inputs because one of the waveforms is a differential measurement.
Any help would be appreciated, thanks.

Hi, I looked at the ELVIS Hardware User Manual and noticed that you have 12 channels that can be used as differential, Reference single ended or non reference single ended. Unless you have them all busy I don't see why you can't use the analog inputs. About the sampling rate, it will be determine by the M Series DAQ device that you are using and the source of the signal. It is a good practice to sample, at least, 10 times faster than the frequency of the input signal. The documentation of the card should show what the maximum sampling rate is.
Now, Open the example called "Multi-Device Synch-Analog Input-Cont Acquisition.vi" at the NI Example Finder under Hardware Input and Output»DAQmx»Synchronization»Multi-Device. If you get the same results shown in the picture then you need to analyze if the voltage divider is affecting the phase.
For more information about synchronization check the article called "Synchronization Explained".
Good luck!
Alejandro | Academic Program Engineer | National Instruments

PXI-7831R analog input max sampling rate?

I'm using 5 of the analog inputs on the 7831R and seem to only be able to get a max sampling rate of 10K per channel. Looking at the specs it should do at least 10 times this per channel, also the time for the A/D loop is 228 ticks of the 40MHz clock so this would suggest a higher sampling rate than just 10K. I'm missing something here... Any ideas as to what the deal is?
pete

Hi Pete,
You are right in saying that the 7831R boards should acquire data much faster than 10KHz. Infact you can take a look at the actual specs from the data sheet http://sine.ni.com/nips/cds/view/p/lang/en/nid/14757 as well as the product manual. However, I am concerned that you may be measuring the rate of acquisition on the RT VI (or any host vi) you are running as opposed measuring it in the FPGA VI.
Your time critical loop may be running at 228 ticks of the 40 MHz clock but the data is buffered (at that rate) and has to be then transferred to the communication loop which then sends the data to the host vi (which may be your RT vi). Hence, the rate at which host VI receives the data will be much slower than the FPGA VI is acquiring data.
Hope this helps!
Prashanth

DAQPAD 6020e misses digital triggers during analog input (AI)

I am using a 6020E BNC DAQPAD to acquire two seperate 12kHz analog signals from a sonar through ACH0 and ACH1. The sonar generates a digital start trigger at the start of each ping to notify the DAQ that new data is to follow and i am using this to trigger my application through PFL0/ TRIG 1. Typical trigger repetition rate required/generated by the sonar is 20-30Hz but is selectable. My problem is that the board/software misses complete analog input data pings when the digital trigger repetition rate goes above 2-3HZ (ie I only receive 10% of the pings I desire). Analog sampling rate is 45kHz and I am acquiring 1-2kSamples per triggered acquisition. The problem happens using a Labview application based o
n a modified version of the shipped "Acquire N - Multi Digital Trig.vi" (and original). Any suggestions welcomed.

Hi,
I believe that the problem you are having is due to using the pause function to pause the acquisition before the next trigger and the fact that DAQpads do not have a DMA transfer mechanism. The default setting is to create an interrupt when the onboard FIFO buffer is half full. So when the pause trigger occurs there will always be data left on the FIFO, up to a half buffer of data.
To work round this problem you can use an external stop trigger instead of the pause.
Or it is possible to change the data transfer mechanism to cause an interrupt on every sample acquired instead of every half FIFO buffer. This will send every sample acquired by the DAQ board to the computer. The drawback is this method is very processor intensive and significantly slows
down data acquisition rates. As you are approaching the sampling limit of the card (100Ks/s or 50Ks/s for 2 channels) you may find that you will get buffer overflow.
To change the interrupt setting use the "Set DAQ Device Information.vi", which is located on the Functions Palette » Data Acquisition » Calibration and Configuration. See the LabVIEW help for information on using this VI.
Kind Regards
Tristan J
Applications Engineer
National Instruments

Different Sampling rates for different channels in Analog Input

Hi,
I would like to acquire data at different sampling rates on different channels say ACH 0, ACH 1 and so on. I have a PCI 6052E board and NI DAQ 6.9.2. Also is it possible to simultaneously perform Analog output on two different channels along with the Analog input? What will be the problems/consequences as far as the system resources are concerned. I am a beginner in this area and would greatly appreciate any help/pointers for my queries.
Thanking you in advance
Deepak

Search the eaxamples that ship with LV.
Theer is one called simultaneous input and output or something like that.
It will get you started.
re: multiple scan rates. This is acoomplished by sampling all channels at the highest rate and throw away the expttra samples you do not need.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Digital outputs while sampling analog inputs

I am currently developing a program using LabView 2012 SP1. I am interfacing with a NI USB-6009 DAQ using NI-DAQmx 9.5.5f4. I am attempting to acquire a voltage reading on three analog inputs (AI0, AI3, and AI4) at 1 second from startup and at 20 seconds from startup. The three digital ports: P0.0, P0.1 and P0.2 are used to turn on transistors for the signals in question and must remain high during the ~20 seconds the readings will take place. I have figured out how to acquire 20 samples over 20 seconds on the analog inputs but have trouble with the digital outputs. The DAQ assistant is not a good option and the USB 6009 has limitations that are not necessarily covered in the example code im finding. Basically I need to turn on (write hex 7) to port P0.0-2, acquire my analog samples for 20 seconds, then bring port P0.0-2 low and end the program. Can anyone help walk me through this? Thank you in advance.
RJ
I surf therefore I am....

Solved it. See attached vi.
I surf therefore I am....
Attachments:
Level.vi ‏69 KB

Use analog input as sample clock

Hi,
I have a PCI 6115 DAQ card. I currently perform an
analog acquisition on ai0, with an external clock on PFI7. But
sometimes, my clock signal is not high enough and the acquisition does
not occur. At some NI show, I heard a trick to solve this problem :
plug the clock on analog input (say ai1), the clock signal gets
amplified by the card internal amplifiers, and then route this
amplified signal to the sampling clock. This seems to be a wonderfull
solution, but I cannot find out to actually redirect the amplified ao1
to the sampling clock. Does someone know how to do it ?
Thanks a lot,
Jérôme Lodewyck

I tested the attached example on a simulated device so hopefully it will work on a real one without any kinks. You didn't specify your programming environment, so I'm assuming you're using LabVIEW. If not, hopefully you can translate to the appropriate ADE based on the picture of the block diagram.
In the example, I'm using an AO task to program the analog trigger as specified. This has two consequences. First, you won't be able to perform hardware timed AO while the AI acquisition is running. If this isn't acceptable, you'll need to try the second approach described in the next paragraph. Second, you'll have to wire the signal to PFI0 instead of an AI channel. With this configuration, the signal will be seen with a +/- 10V range and referenced to AI Gnd. Since the trigger DAC is an 8 bit comparator circuit for this board, you'll have ~80 mV of resolution. You didn't mention what the amplitude or DC offset (if any) of your signal is, but hopefully this resolution will suffice. You can use the level and hysteresis properties for the analog trigger to filter out noise in the analog signal or account for DC offset.
If the constraints listed above aren't to your liking, you can try to use a second AI channel as a trigger channel. This has some advantages and disadvantages. The disadvantages are that this requires you to use a trigger with your AI task and it also requires you to acquire another channel of data. You mentioned the trigger wasn't a problem so this can probably be taken care of with simple analog start trigger. The data can easily be thrown away, but depending on your sampling rates, it might require a lot of extra bus bandwidth or processing power when scaling the data. On the positive side, it doesn't require you to use up your AO channels needlessly and you can apply gain to the input signal in order to effectively increase the resolution of the trigger circuit. You can also apply a low pass filter and different terminal configuration if desired. The gain, coupling, terminal configuration, filtering, and coupling applied to the signal is controlled by the values used in the Create Channel VI and the Channel Property node. To create an example that does this, simply start with one of the shipping examples for an Analog Start trigger, change the trigger source to one of the AI channels instead of a PFI or APFI pin, and change the clock source to the AnalogComparisonEvent as shown in the attached example.
That should do it. Good luck with your application and post back if you have additional troubles.
Attachments:
AI - External Clock Using Analog Trigger Circuit.vi ‏81 KB
AI - External Clock Using Analog Trigger Circuit.JPG ‏60 KB

Synchronize hardware timed buffered counter acquisition with buffered analog input acquisition

LV7.1
DAQmx
PCI-6036E
SC-2345
Windows 2000
Greetings.
I am simply trying to synchronize AI readings with readings from one Counter.
I am trying to perform buffered analog input synchronized with buffered counter acquisition.
I'd like the AI acquistion to trigger the Counter acquistion.
I'm currently setting the Sample Clock Source for the CI Cnt Edges Task to "Dev1/ai/SampleClock" but when I try and set the source for the "DAQmx Trigger" I can't seem to select one that works. I assumed that the source should be the "Dev1/ai/StartTrigger" but that produces and error as does selecting any of the PFI's.
I'm new to DAQmx and didn't have any luck with the examples or what's been previously posted.
Thanks for your help.
Attachments:
Initialization.jpg ‏84 KB

Gentlemen-
All of your initial help was great. I had some noise on my counter lines so switched from an E-Series card to a PCI-6259 M-series card in order to use the counter digital filters.
Now I can't get a corellated buffered counter and buffered analog input acquistion to work. This same code worked fine on an E-series card but it doesn't on the M-series.
I verified that the source and gate of the counter are working properly using the test panel and a external function generator.
But when I run the attached code I get no data out of the "Counter 1D U32 NSamples", only an error saying that the timeout of the function was reached and no count data became available. Am I missing the specification of a another clock or something?
The counters also work fine using the M-series example code "Count Digital Events (M-Series DAQmx) but this is not a buffered acquisition.
Any help would be greatly appreciated.
Steve
Attachments:
Sample_Code.jpg ‏136 KB

How to use counter output pulses to trigger analog input?

Hello all,
I hope the kind people using this forum can help me, a lowly beginner LV programmer! I have been attempting to create a VI that produces a user defined number of TTL pulses, separated by every n seconds. Each TTL would be outputted to a stimulator, which in turn generates its own TTL. Using the stimulator-generated TTL, I would like to trigger finite analog data acquisition (e.g. for every TTL, trigger the collection of a data sweep that contains 4000 samples (collected at 4000 Hz), with 1000 samples collected pre-trigger. I would like to also be able to see each data sweep as it is triggered on a chart. As I understand things (lots of online/book/forum reading), I should be using the counter output to generate my TTL pulses, and syncing each counter produced TTL with analog input, as well as using a reference trigger. Also, the AI part should be started first, so that I don' t miss any counter outputs. If it matters, I also need to use one of the AI channels to acquire the TTL, so I can see my stimulator-induced responses to the stimulator in time.
I am able to generate the TTL pulses from the counter output, but I am having a problem with the AI part. I am unsure how to sync the counter output with AI. Also, since I need to acquire pre-trigger samples, I would be needing to acquire samples continuously, but when I set 'continuous samples' on daqmx timing, the VI doesn't work (hence why's its set to 'finite samples').
I hope someone out there can help, as I have been at this for what seems ages, with limited success. I am using a USB-6259 and LabView v8.2. Thanks!
Attachments:
RC001 v_1.vi ‏49 KB

Hello,
Due to the fact that analog tasks themselves are not retriggerable, a
pulse train produced by a counter is always used as the sample clock
for the analog input task in order to recreate a retriggerable effect
for analog input. This can be done by creating a finite pulse train set
to retriggerable using the DAQmx Trigger Property Node, or the pulse
train could be continuous and just be gated by another signal. Neither
of these methods can be properly applied in hardware to create a
retriggerable reference trigger. You can however implement something
similar in software by just stopping and restarting your reference
triggered analog input task within a loop. There will be some delay
between when the task is stopped and restarted, as these events require
software intervention, but if there is enough time between when each
trigger signal is generated, there should not be any noticeable delay
or missed samples.
I have attached an example of this!
Mark B
===If this fixes your problem, mark as solution!===
Attachments:
RC001 v_1mod.vi ‏25 KB

MyRIO analog input express Vi (n samples) missing file

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