Sample Clock problems

Ever since I put a sample clock, my counter is going haywire...any suggestions?
Attachments:
sample rate.vi ‏196 KB

I can read code but not minds; could you try a bit harder? You have a graph labeled "Horizontal Displacement." When I follow back the wire going to that graph, it comes from an analog input task. That task does not have a sample clock associated with it, that I see. The only sample clock I see is on the Horizontal Load channel. As for the cycle count, do you mean the Cycle indicator? Can you be more specific than "counting sporadically"? Do you mean there are conditions under which you expect it to count an additional cycle, but it does not do so?
It looks to me like you're try to count transitions where your input goes from less than to greater than some value. You're reading multiple data points (don't know how many) on each cycle of the while loop. However, you only process one point per loop cycle, discarding the rest (but still graphing them), so you could easily miss a transition.

Similar Messages

PCI-6229 Digital I/O sample clock problem

Hi,
I am using PCI-6229. I need to use digital output channel to generate 20KHz 30%duty cycle pulses.
The datasheet shows DO sample clock frequency can be 1M Hz. But in may application, only 100KHzTimebase can work to generate. But acctually I need at least 200K Hz.
Attached is the Vi I made. Can anyone help me with this problem?
Thanks
Solved!
Go to Solution.
Attachments:
Digital pulse_DO Channel.vi ‏26 KB

Hello All,
I tried to modify the VI posted in this thread in order to aquire a digital signal with the PCI-6229. Sinc the frequency of the signal is below 1k i tried to devide the signal of ctr0 respectively of freqout by 8 or 16 since 6.25k or 12.5k sampling frequency would be more than enough for my purpose. By the way, when I am using the 100k timebase for the timing of the task the programm is working. Since i try to monitor up to 20 channels, the amount of data genereated is too much. Therefore I tried to use the modified VI.
Sometimes, the VI works, but almost always, the DAQmx - Read VI doesn´t terminate.
Has anybody an idea what i did wrong?
Thank you for your assistance.
Sincerely,
Mirko
Attachments:
Digital pulse_DI Channel-1_mod.vi ‏32 KB

Wait for Next Sample Clock error, or 'How do I put this VI on a diet'?

Hello!
In the attached VI I've been running since June, I have all the functionality I need. No questions there at all, thanks to much time and help from this board!
My nagging problem is that any time I use the PC for other minor tasks other than Labview, it will display the following error:
209802 occurred at DAQmx Wait For Next Sample Clock.vi:1
A search earlier in the month indicated that it could have been a result of my old and outdated PC; I've since replaced it with a brand-new dell dimension 1100. Celeron 2.53ghz with 1.00gb of ram. Should be enough to service Labview and other minor tasks (automatic antivirus updating and also maintenance tasks). However, any time any other program opens or even if the screen is scrolled around on Labview quickly, I get that same error.
Resource usage when idle, with nothing but this VI running is 5-10%, all labview. Upon scrolling the VI, it quickly jumps to the 58-60% and above mark and soon throws that error.
I know that there's a lot of code here that can be cleaner--I know that even though it's functioning correctly, there could be a less resource-hogging way to go about it. Can anyone give me any suggestions on how to make this VI a little 'lighter'?
Thanks so much in advance,
Ralph
Still confused after 8 years.
Attachments:
Currently Running 063006.vi ‏899 KB

Hi Ralph,
The wait.vi waits until the amount of time has passed. While the wait on next ms.vi uses some kind of quotient and remainder on the computer time until the remainder passed zero.
In this way you can synchronize 2 loops, and somehow it is less time-consuming. The only difference you will see is in the first run!
There you see a smaller amount of time:
Message Edited by TonP on 10-04-2006 04:21 PM
Free Code Capture Tool! Version 2.1.3 with comments, web-upload, back-save and snippets!
Nederlandse LabVIEW user groep www.lvug.nl
My LabVIEW Ideas
LabVIEW, programming like it should be!
Attachments:
Example_BD.png ‏2 KB

Can I use a substitute for the Sample Clock?

I have three different analog inputs coming from one device (PCI-6221). Two inputs are running at the same sample rate while the third needs a faster sample rate and a trigger. I have these seperated as two seperate tasks but my problem is they both use the sample clock. Can I use a substitute for the sample clock on the third channel?
I am running LabVIEW 8.2 on Windows XP.
Thanks in advance for your help.
Ron Deavers, CLD

Hi programmindragon,
I understand you are trying to
configure your PCI-6221 to sample on multiple channels, while having
different rates and triggers for the channels. Unfortunately, you can
only configure one analog input task to run at once and all the channels in
the task must share the same configurations, including the sample clock
and trigger. This is due to the fact that all the channels are
multiplexed to a single amplifier and ADC on the device. Thus, you will
not be able to configure the two inputs at one rate and use a different
clock rate and trigger for the third input. Is it possible to sample at the
maximum rate on all channels and decimate the data that you don't need on the certain
channels, as well as share the same type of triggering? Hopefully you will be able to run your application with the same configuration across multiple channels, otherwise you may need multiple DAQ devices. Please let me know if you have any further questions related to this issue.
Regards,
Daniel S.
National Instruments

External sample clock encoder

hello,
my problem is very urgent, I have to sample 3 analog input synchronised to an encoder. How can use the channel from the encoder and use them to generate a external sample clock for acuiring the analog signals?how can I phisically attache the wire from the encoder to the digital line?and how the vi should be??my encoder has A, Anot,B,Bnot channel, but eventually with a circuit I can get just A and B. I have a PCI6221.
Please is very urgent!!

Hi orsogna,
see the example Cont Acq&Graph Volt-Ext clock in the Labview Example Finder.
About wirings, you have to connect our encoder signal (A signal is good) to a PFI input in order to correctly read the TTL signal.
Ciao!
Simone S.
Academic Field Engineer - Med Region

Using an internal sample clock with a digital input

I am using an encoder to measure angle and velocity. The example that I have started with is here. https://decibel.ni.com/content/docs/DOC-6834. The problem I am having is with the Sample clock, I get a timeout at the DAQmx read. If I remove the sample clock the VI runs fine, but I have no idea of my sample rate. Below is the the problem setup with the Sample clock inline.
Attachments:
encoder with timer.JPG ‏50 KB

Hi there, a couple suggestions: first , this is a post that it is suppose to be on the DAQ board. Second, you are not being clear about the error, try to include the error code, description and its location, is it coming out of the channel node or the timing VI? Also what hardware are you using?
Now, If you open the example called "Measure Angular Position.vi" from the NI example finder, drill the DAQmx Create Channel, you will see that you are missing a couple terminals for the task configuration, I wonder if this is part of the error.
Alejandro | Academic Program Engineer | National Instruments

Using AI Sample Clock to Trigger Counter Samples

My basic question is: Is the ai\SampleClock signal only active while an analog input task is running?
The details are:
I have an X-series PCIe-6321 multifunction DAQ card. It is controlling a SCXI chassis and has a SCXI-1180 and SCXI-1302 so I can control analog inputs of the chassis as well as access the 4 counter on the card. My application requires that I use all 4 counters to measure a frequency input signal and synchronize the samples to the analog input signals. I have created 5 tasks, 1 for the AI and 1 for each counter.
I am using LabVIEW 8.6.1 with the latest NI-DAQ drivers on and 64-bit Vista OS
1. Are there any driver or hardware restrictions that would cause this solution not to work?
2. Can I use the ai\SampleClock as in input sample clock for each of the frequency tasks? If I do this will the sampling start be syncronized? I.e. if I start each of the frequency tasks first, will they wait until the AI task is started before they start sampling?
3. If that doesn't work, do I need to route the sample clock from the AI task to a PFI line (PFI1) and then use that as input to the frequency task sample clock?
I usually do option 3 when synchronizing two cards in PXI chassis and only use the software task start in stead of of synchronizing on a digital start, since the sample clock will control the samples anyway. I need to know if the same behaviour works with the scenario above.
Thanks,
Bob
Prolucid Technolgies Inc.
Solved!
Go to Solution.

Hi Bob,
I can confirm that the ai/SampleClock will only be active while the AI task is running. As far as the other questions go:
1. You'd have to provide more information about what you looking to do exactly, but there is no problem with routing the sample clock of the Analog Input task to be used with the Counters. I would read through the section of the X Series User Manual that discusses sample-clocked frequency measurements (starting on page 7-16) for some more information about what is actually going on during this configuration to make sure it suits your requirements.
The frequency of the signal to be measured should be at least twice as fast as the sample clock of your AI task.
2. You can indeed route the signal to all four tasks at the same time (you can refer to the Device Routes page in MAX to double-check routing restrictions). The sampling will be synchronized provided the four counters are started before the AI task, but the counters will be armed at different times unless you configure an Arm Start Trigger (see page 7-45 of the X Series User Manual). I would consider using the ai/StartTrigger if you wish to do this.
The effect of not arming the counters at the same time would be a different number of periods to average on each counter for the very first sample (assuming averaging is enabled). This might not be a big concern but I just wanted to point it out.
3. The routes are available internal to the board so external routing isn't necessary, you can just specify to use the AI Sample clock for the clock of each counter and the routes will be made for you. If you prefer to export the signal on a PFI line and route it back in on a different PFI line this option is also available to you but shouldn't be necessary.
I hope this helps you get started. I'd make sure to take a look at chapter 7 of the X Series User Manual if you get a chance since it describes how all of the counter configurations work in more detail. If you have any related questions don't hesitate to post back.
Best Regards,
John
Message Edited by John P on 12-01-2009 07:52 PM
John Passiak

Sharing an external sample clock between PCI-6722 and PCI-6602

I need PCI-6602 work with PCI-6722。6602 shares 6722’s ao/SampleClock as external clock and triggered by 6722’s ao/StartTrigger。The master device is 6722, which refered as Dev1, and the slave device is 6602, which refered as Dev2. A RTSI line is used to connect the two devices correctly.
I use C API to finish my program and my code is as follows:
//config 6722 analog out task
1、DAQmxCreateTask("NI6672", &hAOTask);
2、DAQmxCreateAOVoltageChan(hAOTask, "Dev1/ao0", "", -10.0, 10.0, DAQmx_Val_Volts, "" );
3、DAQmxCfgSampClkTiming(hAOTask, "", 1000.0, DAQmx_Val_Rising, DAQmx_Val_ContSamps, 1000);
4、DAQmxWriteAnalogF64(hAOTask, 1000, 0, 10.0, DAQmx_Val_GroupByChannel, data, NULL, NULL);
//config 6602 counter task
5、DAQmxCreateTask("NI6602", &hCounterTask);
6、DAQmxCreateCICountEdgesChan(hCounterTask, "Dev2/ctr0", "", DAQmx_Val_Rising, 0, DAQmx_Val_CountUp);
//use /Dev1/ao/SampleClock for external clock
7、DAQmxCfgSampClkTiming(hCounterTask, "/Dev1/ao/SampleClock", 1000.0, DAQmx_Val_Rising, DAQmx_Val_ContSamps, 1000);
//use /Dev1/ao/StartTrigger
8、DAQmxSetTrigAttribute (hCounterTask, DAQmx_ArmStartTrig_Type, DAQmx_Val_DigEdge);
9、DAQmxSetTrigAttribute (hCounterTask, DAQmx_DigEdge_ArmStartTrig_Src, "/Dev1/ao/StartTrigger");
10、DAQmxSetTrigAttribute (hCounterTask, DAQmx_DigEdge_ArmStartTrig_Edge, DAQmx_Val_Rising);
//start counter task first
11、DAQmxStartTask(hCounterTask);
//start 6722 task
12、DAQmxStartTask(hAOTask);
I run it on the MAX virtual Device, and the Step 11always returned -89120。
I try to slove this problem, so I change the Step 7, use /Dev2/PFI9 to instead of /Dev1/ao/SampleClock.
7、DAQmxCfgSampClkTiming(hCounterTask, "/Dev2/PFI9", 1000.0, DAQmx_Val_Rising, DAQmx_Val_ContSamps, 1000);
The code runs well, but I don’t know which terminal is connected by /Dev2/PFI9. Does it connect to /Dev1/ao/SampleClock？
I use another API DAQmxConnectTerms to ensure that, I add a Step before Step 11.
DAQmxConnectTerms( "/Dev1/ao/SampleClock", "/Dev2/PFI9", DAQmx_Val_DoNotInvertPolarity );
The program also run well. But I am still not sure that 6602 is sharing /Dev1/ao/SampleClock。If not, which terminal of Dev1 is connected by /Dev2/PFI9?
Is my code right? If not, hwo to fix my code or supply some example for me? Thanks.

Hello Shokey,
From looking over your post, it looks like you want to program in C, using simulated instruments, a master/slave design with a PCI-6602 and PCI-6722. The PCI-6722 is the master device and the PCI-6602 is the slave device. In order to implement this with the real cards, you would need a RTSI cable between the 2 cards in order to pass the triggers and the sample clock. Unfortunately with simulated devices you can't implement this so parts of your code won't be able to work exactly like if you had the instrument.
If you did have the instrument, you can implement this by performing the following steps:
Master Device:
1.) Export the ao/SampleClock and ao/StartTrigger to a RTSI Line. (See DAQmx C Reference help for DAQmxExportSignal to export these)
Slave Device:
1.) Set the Sample clock and the trigger to the RTSI.
There is another forum that I think will help you out to implement this correctly. In this forum, the customer was trying to export a trigger through a RTSI and the problem he was experiencing was a broken RTSI cable. His code, he states, works. I hope this helps you with this and if you have any more questions, feel free to post.
Jim St
National Instruments
RF Product Support Engineer

6120 external sample clock

We have been successfully using the 6052e for some time now to acquire our radar�s analog output. This output consists of a data signal synced with a 20 Hz analog trigger that also comes from the radar. This has been a nice easy solution but now we have increased our frame rate from 20Hz to 60Hz. Quantitatively, the old system was taking 20Hz X 9,984 samples = 200 KS/s, while the new system takes 60Hz X 9,984 samples = 600 KS/s. The 6052e no longer could handle the increase so we purchased the 6120.
The problem we have now is that 6120 does not seem to support the same acquisition technique that we used with the 6052e.
Here is what we are doing with the 6052e:
We use the 6052e to generate a pulse train with frequency correspondin
g to our sample rate, which is gated by a signal that turns on when the trigger pulse occurs and stays on for a fixed number of samples. We then route that pulse train back into the board as our external sample clock. The problem seems to be that the 6120 does not support the external sample clock.
The reason we use this technique with the 6052e is to guarantee that we get the same number of samples between triggers.
Ian Starnes
Sr. Software Engineer
NIITEK, Inc.

Ian,
I am going to guess that you are experiencing this problem because our S-Series boards such as your 6120 use a pipelined FIFO ADC process. Specifically, our S-Series boards do not send the last 3 samples of an acquisition when using an external clock. The last three samples remain in the FIFO on the card. Therefore, if you begin your acquisition, receive a trigger pulse, then receive 9,984 clock edges on the sample clock, and then read all the samples in the buffer, you will only receive 9,981 samples. Consequently, if you set the AI Read.vi to read 9,984 samples it may timeout because it is still waiting for three more samples to be acquired. This would create the allusion that the external clock was not working with the 6120.
The good news is that i
t is easy to solve this issue. You simple need to read 3 less samples the first time AI Read is called. Therefore, the first time you call AI Read you need to read 9,981 samples and then the next time you call AI Read you will continue to read 9,984 samples. This will ensure that you will get the same number of samples between triggers except for the first time which will be short three samples. However, with this method, the first three sample of each trigger will be the last three samples from the previous trigger signal.
Please see this KB for additional information on how to ensure that you get the proper amount of data for each trigger signal that you receive:
http://digital.ni.com/public.nsf/websearch/D64CD277A6B739A186256A73007E7BCC?OpenDocument
Please let me know if you are still having difficulty or if the information I provided did not help resolve the issue.
Regards,
Bill B
Applications Engineer
National Instruments

Unable to use sample clock digital filter - PCI6602

I can't seem to get digital filtering of the sample clock to work on my PCI6602. I'm using DAQmx 7.4, with one of the counters configured for buffered-edge counting. Whenever I try to configure digital filtering on the sample clock (coming in on pfi10):
counterTask.Timing.SampleClockDigitalFilterEnable = true;
counterTask.Timing.SampleClockDigitalFilterMinimumPulseWidth = 0.000005;
I get the following error message when I start the task:
Additional information: Digital filtering is not available for the given terminal.
Device: Dev3
Property: NationalInstruments.DAQmx.Timing.SampleClockSource
Corresponding Value: /dev3/pfi10
Channel Name: phaseLockOscillator
Task Name: PhaseLock task
Status Code: -200772
I thought digital filtering was supported on all pfi inputs on the 6602 - so can anybody give me a hint as to what I'm doing wrong !?
Many thanks in advance,
Jony Hudson

I have the same problem with the PCI-6280., help me please!

6251 AO sample clock

Hello All,
I am using a M6251 board for analog output. However, I have the problem that the board only allows discrete increments in the frequency of the Analog Output sample clock. The frequency step-size varies, depending on the sample-clock frequency, and reaches around 10kSa/s when the sample clock is running at 1MSa/s. Am I doing something really stupid, or is this a limitation of the board? The digital pulse-train generation does not seem to have this limitation. If this *is* a limitation of the board, is there some way of overcoming it? I have tried to re-route one of the counters into the AO sample clock, but, when I do so, I get an error message saying that resource is already in use.
Any help will be greatly appreciated.

There are two things that I can think of that could be causing the behavior that you're seeing. The first is that you are using the onboard Frequency Generator to generate the AO Sample Clock. If this is the case, you will notice that the Frequency Generator has limited capabilities in the frequencies it can generate. If this is the case, use the default AO Sample Clock as the clock for your AO application. M Series devices have a dedicated timing engine for AO applicatins, hence, no onboard subsystem (i.e. counters, PFI lines, etc.) will be used up if you use the AO Sample Clock default selection for timing your AO applications.
The second guess that I have is that you are not specifying your AO application correctly in order to get the generated waveform frequency you're expecting. Their are several parameters that you need to set in order to get an expected frequency with AO - rate and samples per channel. Have a look at How Can I Calculate the Output Frequency of my Analog Output. This knowledgebase might currently be written with Traditional NI-DAQ terminology, but it should still help. Also, remember that even though you specify a certain update rate on your analog output, the actual update rate will be slightly different because of limited resolution of the divide down.
Jared Aho

672PCI 6723 error when attempting to generate DO signal with 20kHz sample clock

I have a piece of code that successfully worked on the PCI-6224 card, but when I tried to implement the same code on the PCI-6723 card I have run into problems.
Here is the code that I am using:
ManchConversion6723();//produces SendIt array of series of 1s/0s
// DAQmx Configure Clock
DAQmxErrChk (DAQmxCreateTask("",&taskHandleFRQ));
DAQmxErrChk (DAQmxCreateCOPulseChanFreq(taskHandleFRQ,"Dev3/ctr0","",DAQmx_Val_Hz,DAQmx_Val_Low,0,20000,0.5));
DAQmxErrChk (DAQmxCfgImplicitTiming(taskHandleFRQ,DAQmx_Val_ContSamps,72));
// DAQmx Configure Digital Output
DAQmxErrChk (DAQmxCreateTask("",&taskHandle));MessageBox("D");//vj
DAQmxErrChk (DAQmxCreateDOChan(taskHandle,"Dev3/port0/line0","",DAQmx_Val_ChanPerLine));MessageBox("E");//vj
DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandle,"/Dev3/Ctr0InternalOutput",20000,DAQmx_Val_Rising,DAQmx_Val_ContSamps,72));
// DAQmx Write Code
DAQmxErrChk (DAQmxWriteDigitalLines(taskHandle,72,0,10.0,DAQmx_Val_GroupByChannel,SendIt6723,NULL,NULL));
// DAQmx Start Code
DAQmxErrChk (DAQmxStartTask(taskHandleFRQ));
DAQmxErrChk (DAQmxStartTask(taskHandle));
When I arrive at the DAQmxCfgSampClkTiming line, I receive an error stating:
DAQmx Error: Measurements: Requested value is not a supported value for this property.
PropertyAQmx_SampTimingType
You Have Requested: DAQmx_Val_SampClk
You Can Select: DAQmx_Val_OnDemand
Task Name: _unnamedTask<0>
Status Code: -200077
I believe the problem stems from the source variable of the function. I am simply tring to send the data out at the 20KHz rate.
Any help would be greatly appreciated. Thanks in advance!
Solved!
Go to Solution.

Nevermind. Seems as though the PCI-6723 does not contain correlated DIO channels. In other words, sample clocks can not be tied to the DIO channels to allow for digital waveform generation. According to the AO Series User Manual, this applies to NI 6731/6733 Only. The error was trying to tell me that only a single transmit or receive channel was allowed.
For this reason, I will just stick with my PCI-6224 card.
Sorry for the confusion.

Sample clock rate when exporting from Matlab

Hi all,
I'm quite new with Labview and got stuck with (probably) some basics. I try to use a data vector generated by Matlab as an output with PCI-6115 (see the pic). I use "read from spreadsheet" VI. Everything works fine but I cannot change the sample clock rate. I wanted to use 100 000 kHz for this (binary) output but I only get 1 Hz which is some default value. The "DAQmx timing" VI which I'm using shows "uses the dt component of the waveform input to determine the sample clock rate". I find this dt inside the "DAQmx timing" but nothing happens when changing. Any help is greatly appreciated!

Do you see those red coercion dots on the inputs of the DAQmx Timing and DAQmx Write? They mean that you are using an incorrect data type. A 1D array has no timing information. The waveform data type includes a dt value and this is required to set the sample rate of the DAQ card. If you don't have this in the text file, you cannot automatically provide it. The Read From Spreadsheet cannot automatically create a waveform data type even if the file does contain dt information. Since you did not attach the text file you are reading, no way of knowing if your problem goes all the way back to Matlab or somewhere else.
In the future, please think about what information you should provide. As mentioned, the text file is important. It's also hard to debug an image. Attaching the actual code or a snippet is much better. A snippet is a png file that can be imported into LabVIEW as actual code. It's an option under the Edit menu in LabVIEW 2009.

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

How can I set the timing property node to sample clock property

I am developing a code for acquiring acceleration data from cDAQ 9184 using DAQmx VIs. I need to include a timing property node with a (sample clock rate) reading property. How can I do that?
Solved!
Go to Solution.

I really appreciate your effort. NowI have this property Node '' DAQmx Timing'' on the block diagram but the problem is that when click on the property NO menu shows up there. I dont know were the problem is. Is there any software drive I need to install other than DAQ mx to solve this problem? The same problem happent any time I want to use a property node. Let me send you my code file so that you can see where the problem is. And I really thank you in advance for your support.
Attachments:
acceleratiom programing code with logging and Analog Triggering.vi ‏22 KB

Sample Clock problems

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