divided time base
In the simultaneous measurement with AI and AO, I used SMU-6124, that supports the time base of 80 MHz clock.
I was told that I can use 80 M/n (integer) as a sampling in SMU-6124.
In order to obtain n is integer, I limited my settings for 2 to 5 common factors.
But, why the actual sampling frequency is different from the sampling frequency of entry, 1.6 MHz (n = 50).
Real rates are 1.67E + 6 (analog input) and 1.54E + 6 (analog output).
What is the problem for this problem?
Any other consideration in its sampling frequency?
Looks like you're on track - to answer your questions:
0) meter tasks can use the time base of 80 MHz (20 MHz and 100 kHz are also available). So the frequencies available, you can generate using the meter is 80 MHz/N, where N is an integer (between 4 and 2 ^ 32). You are still limited to the average fracture, but you would work with a higher time base so you could reach the frequencies that you couldn't otherwise (for example 1.6 MHz).
(1) you can check the actual sampling frequency of the counter by using the following property node:
(2) you can run GOT it, AO and two counters at the same time in separate tasks - I'd start, AO and Ctr2 before Ctr1 so that all tasks starts at the same time. If you started Ctr1 first, then the clock will then perform tasks would begin at different times (software-based) unless you use a trigger to start.
I'm glad to hear that this has been helpful to you, I hope all is well and good luck to you with your application!
Tags: NI Software
I use an external source for the time base a task of analog input sample clock. I'm dividing down by 100 to get my sample clock. Is could someone please tell me if my first sample clock pulse will be generated on the first impulse of the source of the base of external time, or about the 100th?
I use a M Series device, but can't see a time diagram in the manual that answers my question.
I don't think it's possible to use the sample clock of 3 kHz on the fast map as the time base clock sample on the slow map and get the first sample to align. The fast card can enjoy on each pulse signal 3 kHz, while the slow card will have to meet the requirement of the initial delay before he can deliver a sample clock. If you turn this initial delay a minimum of two ticks of the time base, the slow card eventually picking around the edges of the clock 2, 102, 202, etc.. You can set the initial delay for 100, which means that the slow card would taste on the edges, 100, 200, 300... but you wouldn't get a card reading slow on the first edge of your sample clock.
Hope that helps,
I use the PCI-6122 card and you want to provide an external clock very specific (preferably 10 MHz) as a time base. I tried to connect my external clock signal to PFI - 8 and then internally of PFI-8 road to the RTSI-7, but it did not work. I use only one card, and have therefore no beeing rtsi cable installed.
Can you help me set up the card to use my external clock?
Thank you for your help. It seems that there is no way around and I have to 'spend' an additional signal generator (locked my 10 MHz reference) to provide a sample clock, locked in my experience.
I use Premiere Elements 3.0 and I'm trying to create a preset for my new project. My source files for this project are 23.976 frames per second, so I tried the project must match. But in the window "Custom Presets", the drop-down lists for editing and the time base Mode are grayed out - I can't change settings at nothing else than to 29.97 FPS. In addition, the only display Format options have 30 images/s.
Is there a way I can set them to 23.976 or 24 fps?
You cannot create a custom preset to these specifications in Premiere Elements, Matt. I'm sorry.
Premiere Elements is limited to standard formats and frame rates.
I am under a layout with no hardware and simulation takes 5 X longer than expected. But when I exit graph it shows the correct output! Is there something to put in place the basis of time?
The installer is completely relevant.
Sampling rate 1000 and block size 1 will bog down the software to the point where it gets behind. Because there is no equipment, you don't get a driver error... but you would. In this case, it is just work really hard. The timestamp is based on how the time of module of data generator assigned.
1000 and 10 is almost as bad.
I would really like to see the spreadsheet... There are modules, such as the average module, that may need to adjust the size of the block down.
I installed yesterday RNR 4.52.017. The backup took 6: 30.
Previous RNR 4.52.005 backup basic ran 1 hour 45 minutes.
The amount of used space on C drive in November last vs last night is the same.
All users affected by time of long term on a backup basis?
Solved; I did not disable my A / V for the base backup. For incremental backups, I leave a / v on. My incremental backups run 15 minutes.
My HARD drive was like 2 pic wood saw outside. (even my dog was barking at the disk). I woke this am to backup base of 6.5 hours. I run A / v monthly complete sweep, so I was comfortable to shoot A / v off the power when the base backup. He is represented, this am, with a / v power off. Great watering duration. Newest RNR is therefore not a problem.
There used to be a FAQ in Apple communities with detailed information on the use of time machine.
This information is always available? One person maintains this info?
What is the thread that you are referring to http://pondini.org/OSX/Home.html
If so, it is more kept up-to-date as the author of the web site with us.
I'm new to labview. Tips for creating a Boolean remains off for 15 minutes, switches ON for 5 seconds, I ask... again, the same cycle should be repeated continuously. I want to start my logic by using the time of the system...
Please guide me.
Here's yet another one:
I use the card PCI-6602 and am a bit new to the use of timer/counters. I use the Commission to measure the position of a quadrature encoder.
I would use the time base internal 80 Mhz the map of 6602, but examples of LabVIEW will not allow that. In the example, he States:
2. call the DAQmx Schedule VI (sample clock) to configure settings of clock synchronization external sample Mode Sample and sample clock Source. The sample clock Source will determine when a sample will be inserted into the buffer. The 100 kHz, 20 MHz and 80 MHz time bases can serve as the sample clock Source. The Edge parameter can be used to determine when a sample is taken.
Is it possible to use the database internal time for my application?
I have attached the example vi that I use.
The rate determines how fast the samples are acquired and put on the material buffer. This value depends on the basis of time, which is specified by the source of the VI DAQmx calendar entry. The default source on the PCI-6602 map is the on-board clock (80 MHz). The rate must be a divisor of the source. For example, 80 MHz, 40 MHz, 20 MHz, 10 MHz,..., would be acceptable values for the entry rate.
So the answer to your question would be to remove the entry from the source and ensure that the rate is a factor of the source. Leaving this entry unwired will use the clock shipped by default of the unit, as shown in the screenshot below:
I hope this helps.
I have a DC 5v pot connected to my USB DAQ 6008. In labVIEW when I run it I get my voltage output as expected but the time base does not scroll it remains fixed. When I change the axis scales the output voltage varies even in the first second only. Does anyone know what is the problem?
I don't think you can ignore the timestamp which is part of the dynamic data. I never use dynamic data and I hope that I am never placed in a situation where I have to.
Eventually, a difficulty for the elevator VI is in the attachment. Since you have wired some scalar indicators data, TI EÉ seems not you care about 1000 samples so I used a function average to get a scalar value at least a certain meaninig. Then I converted to a real scalar.
If you want to paste the dynamic data, you cannot use the function bundle in VI of the gear. The correct function would be the merge of the signals feature.
I want to calculate an acceptable rate of analog output, one that is taken in charge by material (PCIe6353), without the rate being changed by the VI DAQmx Timing (sample clock). The final objective is to have a rate of analog output that is an integer multiple of the analog input for precise frequency, since the sinusoid AO's amplifiers, which have a ringtone when AO updates occur.
According to 27R8Q3YF of the knowledge base: how the actual scanning speed is determined when I specify the rate of scanning to My d..., the rate is revised as needed by calculating the rate of clock / asked for advice, divide the result rounded downwards and upwards in the clock of the Board and use the one that is closest to the requested speed.
If 'Embedded clock' is selected, which is the result "Council clock. DAQmx sample clock timebase Timing node - SampClk.Timebase.Rate says 100 ms/s. However, for a rate resulting from the update of 2.38095MS / s, the divisor of the time base timing node - "SampClk.TimebaseDiv" gives a value of 42. 42 x 2.38095 M = 99, 999, 990, where it should be 100 ms/s.
How to calculate an acceptable rate of analog output is supported by the hardware? I have other plates, in addition, a general method would be appreciated.
I haven't worked all the details yet but noticed a few things that may be relevant.
Req AI rate isn't a whole ditch 1E8. It is used to determine the rate of the AO.
There is no check to ensure that the rate of the AO is an integer division.
It seems that you have the right idea, but the implementation is not yet there.
I do not erase the cards immediately after the transfer of photos to my computer. Sometimes I'll use a card that has files that it contains are three months to one year, but which have already been uploaded to the images folder. After the "spring from here" and "fall back" time changes, when I use Image Capture to transfer images I've done since the last download, it also downloads the 'old' still once, change the time of the capture of an hour and adding a space and a '1' at the end of the file name. I do not change the time in my camera for changing the time twice a year, and I leave winter time in the area where I live most of the year. If I'm living in the same place for more than a week or two, I have sometimes, but not always, change the computer's time (or let the computer determine the area according to its location).
To further complicate things, this also happens if I travel between two time zones. There is in the computer of the images that have been made in Vancouver (Pacific time zone) on May 3, 2015. On May 4, while remaining in Vancouver, I downloaded the files on the computer. Such a created file date shows may 3 at 21:13. On May 10, while in New York City, I downloaded images made in New York on 8 May. At the same time, Image Capture download new images of Vancouver, but shows them as having been made three hours earlier than that shown in the previous (Vancouver) download. Very probably, at this time, the computer has been set to automatically set the time zone according to the place or I reset the area because I was going to be in New York for several months. Below a screenshot shows this.
Of course, this duplication takes twice the storage space. This means also having to spend time to throw the double copies. Or triple copies, sometimes quadruple copies, if the memory card contains pictures that spans two or more changes seasonal clock.
Is there a way to avoid this? If data in the camera exif photo has not changed, why the computer would have any idea that the official time (or time zone) was different?
Thanks much for the ideas you may have.
Is there a way to avoid this? If data in the camera exif photo has not changed, why the computer would have any idea that the official time (or time zone) was different?
Photos will use the time current system as the time to interpret the timestamp on the pictures in the camera.
If the camera time is different from the time of your system, it makes it easy to import, if you set the area of working time in the preferences system at the same time basis as the camera before importing new photos.
I am running a NI 9234, and NI 9222 module on a cRIO-9114 chassis with a real-time 9022 controller, data acquisition on the 8 channels on the full sample rate, using the FPGA.
My problem is the synchronization of the data, where the NI9234 is usually a late acquisition, compared to the NI9222. I tried manually delay the NI9222 to take the first samples, but so far without success.
To solve this problem and also to ensure a rate of data more comparable on both cards, I was wondering is it possible to create a Source of time Base master for the NI9234 WITH THE FPGA (opposite to import from another NI9234 or similar module)? The NI9222 I already provide with sampling of the impulses from the FPGA (as expected with this module).
Another issue would be the characteristics of the exact chronology of the two modules, including in terms of synchronization between the beginning of the acquisition and the first samples of data. I couldn't find any information about it...
Thank you in advance,
I've never heard of a possibility to use a time base FPGA with a module of Delta-Sigma.
But I think that the question should be what has not worked to delay the signal and how you did it. Have you read this article?
How can I compensate for delays of different group with the C Series Modules in LabVIEW FPGA?
Can you give a more detailed description of your trial to delay acquisitions? Can you provide a code example?
I developed the following circuits:
TX: a Circuit that generates a 40 kHz of frequency using a LM555, the LM555 is connected to a gate AND who, when you use the test on MyDAQ Panel (6216) I put cntr0 and set it to the detection of edge I can count the number of detections of edge when I activate the port up and when I turn it on it low stop recording of the counties.
Rx: Reception Circuit contains an op amp that is introduced in a LM567CN tone decoder which is set at 40 Khz. when the receiver PLL circuit locks on the 40 kHz signal switches LM567 pin 8 output ground.
Question: I am NEITHER very new and ask yourself where the starting point would be to create a VI that will trigger the Tx circuit, and then measures the time required for the circuit of Rx to receive the signal, this intitial will carried out through the air and then I want to move it through a meduim such as water. Someone at - he tried or seen anything that would be useful to create a vi that correspond to this.
Any help would be greatly appericated.
The digital output control signal enable for the LM555. Connect from the digital output line at your door AND as well as a PFI lines on the 6216 (this will be the "first" edge). Connect pin 8 of the LM567 to a different line of the PFI on the 6216 (the 'second' edge). You can configure the polarity up/down via the Create channel VI (looks like your second advantage is going to be 'falling').
Programming would be as follows (in order):
1 configure the tasks as shown in the related examples (i.e. channel to create / configure synchronization).
2. start the task of digital output.
3. write the 'low' digital output to ensure that it is initialized.
4. start the task of separation on both sides (it should be buffered as in the example linked even if you are only reading a sample).
5 write the digital output 'high '.
6. reading (a sample) the task of separation on both sides. Specify a time for read long enough to ensure that the falling edge is considered.
7. write the 'low' digital output (assuming that you want to disable the Tx when you are finished with the test)
8. stop and disable the two tasks.
The measured result will be a 12.5 ns resolution using the time base 80 MHz by default on the 6216.
I have several cDAQ modules I use to collect data. I use vi to Write can Express to save data to a file of PDM.
When you examine the recorded data files, the measured data from NI 9215 provide pleasant timestamps to match how the DAQmx task has been set up--delaying the sampling frequency of 1000 with a 1 ms in the While loop. However, although in the same vi - different tasks, but the same while loop - horodateurs of the NI 9234 do not correspond to the task of DAQmx implemented - sampling frequency of 1000 with a 1ms delay. After reading the material provided with the NI 9234, I found that maybe the machine clean master Timebase Source. There were documents that says he can be configured to be originally of Timebase of Master for the other modules:
It is desirable to have the timestamps for data measured across all modules to match. We do not have the FPGA Module for LabVIEW. Is there a method in LabVIEW for all modules use the same master time base Source? I assumed that because all the data collection has place in the same while loop by using the time delay of 1 ms it was forced through the code. This hypothesis seems incorrect from my review of the PDM data files.
The NI 9204 provides a trigger only.
LabVIEW 2010 SP1
Slot 1: NEITHER 9204
Slot 2: NEITHER 9215
Slot 3: NEITHER 9234
Slot 4; Vacuum
An important concept to note is that the 9234 uses a delta-sigma converter and a clock of oversampling to read analog data. There is an inherent delay of entry due to analog and digital filtering built-in. Since the 9215 has a lower resolution there will be a lag the 9234 and 9215 finished. I've included some resources below:
What are the for the NI 9233, NI 9234, and NI 9237 valid sampling rates? : http://digital.ni.com/public.nsf/allkb/593CC07F76B1405A862570DE005F6836?OpenDocument
Synchronization of DSA, S and X series devices with a NEITHER-DAQmx single task series: http://digital.ni.com/public.nsf/websearch/78E44565FD87E7D686257108007F94F8?OpenDocument
Synchronization with NOR-DAQmx of acquiring dynamic signals (DSA) products:http://digital.ni.com/public.nsf/allkb/A133ED27DF9BCC5986256F2E004BA342?OpenDocument
Have you tried to put two modules in the same spot? Alternatively, you can export the sample clock 9234 and tasks installation separately.
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