Analog in digital in and digital out slow ?

Hi
6261 PC board used.
I have 5 analogue channels as input, 2 digital channels as input, one of which is a trigger for the analogue
sample read. The analogue samples are written to a labview measurement file (.lvm) all this
is fine and dandy and can read up to about 720 k samples/s.
But when I try to output the second digital input (the one that isn't a trigger), I do not get an output
that is related to the input (using an oscillioscope to view input and output). The input shows
about 5 pulses to the outputs one. Eventually I want to sample the second digital inputm and
delay it slightly before outputting it, but I want to be confident I will be getting the same number
of pulses out.
I even trimmed to vi down just have one dig in, going straight out, and it still didn't match the
number of pulses.
I am using DAQmx throughout, could that slow things down (using express DAQ) ?
any help appreciated,
sandra

here is my latest vi, I am still having some problems.
I created this vi from the 'Gen Dig Pulse.vi' example, I have changed it to
generate the pulse according to ticks rather than frequency and I have
added the trigger.
The source of ticks is a digital pulse from an optical encoder that is sending
out 360 pulse per revolution of an engine crankshaft, the trigger is from the
same optical encoder, but it one pulse per revolution. I require the
output to be of the same frequency as the trigger and delayed by a
configurable number of ticks.
The output is ok for up to about 400 revs per minute, but after that the output
is intermittent and some pulses are lost.
If anyone can take a look at the vi and advise me on this I would be grateful.
I have tried leaving only the 'wait until done task' in the loop, but this gave
no output, I also tried adding an implicit 'timing' task, but this gave to many
outputs,
regards,
Sandra
Attachments:
Gen Dig Pulsetickstrigger.vi ‏32 KB

Similar Messages

Simultaenous digital out and analog in

Hi. I am running into an issue with the simultaneous AI (analog in) and DO (digital out) with Athena (www.diamondsystems.com) and LabVIEW (see the supplied files): The original program example supplied by somebody (the attached 060126 file) runs fine with these two simultaneous operations.
However, for my specific requirements, I would have to put a frame (flat sequence) around the DO part (the attached 060131 file), followed by another flat sequence frame that changes another DO state. The reason that I must do this is that I have 2 valves which change states as the AI operation continuous to run.
I have noticed though, once I put those flat sequence frames around it, the DO pauses and doesn't perform the operation until the AI loop is stopped. I have tried to create various local variables but the issue persists. Would there be a workaround for this? Thanks.
Attachments:
HMIR_SBC_060131.vi ‏374 KB
HMIR_SBC_060126.vi ‏137 KB

I have taken a look at your code. Based upon your description,
and the fact that I do not have the driver for your device, I am not exactly
sure where the program is pausing. I can give you some suggestions to
resolve your problem. When you use a flat sequence structure, every piece
of code in a frame has to finish execution before the next frame will start
execution. If you have code in parallel (i.e. digital output and analog
input) in one frame and the same in a second frame the digital output and analog
output in the second frame will not start until all the code in the first frame
has finished execution. In your case it you have a while loops for
digital input and output in the first frame. When both of these loops
finish execution, you should see the second frame start shortly after.
From your description what I believe is happening is that the digital output in
the first frame is finishing and waiting for the analog input to finish.
After the analog input loop finishes the second frame can start. If you
want the second frame's digital output to start before the loop finishes
execution you will need to take that code out of the frame.
Regards,
Jesse O
Applications Engineering
National Instruments
Jesse O. | National Instruments R&D

2 digital out 2 analog in loop

LabVIEW 2013 SP 1
Windows 7 Pro
NI DAQ PCIe-1433
Custom PC board attached to the DAQ
Each individual signal disucssed has been tested and works.
Hi all,
I have an application that does a bunch of setup, when the user presses go, runs a main loop that does a number of things, saving images, etc., and also periodically sets digital output pins HI, and then LO.
This has to be synchronized with the image retrieval and storage.
It is working well.
I need to add 2 Analog Input signals, also synched with the Digital out and the video capture.
I simplified it all so that in the test application, I start the app, set up some preliminary stuff, and when the user presses go, run a main loop.
I've removed the video component and data file components for now.
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When the left mic reaches a trigger level, it flags it, and stops listening.
When the time is up, the digital out (left puff) is set to LO.
If the trigger level hasn't been reached when the digital timer is up, it stops listening then too.
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And that failure is true for all future loop iterations.
I threw in a counter to show me if the LabVIEW was enterring the case statement, and it is counting up as it should. But the signals are not generated.
If I go to the diagram, and turn on the 'lightbulb' tracking; everything works.
I get the digital output when I should, I get the analog in.
When I turn off tracking, it doesn't work past the first iteration.
I've attached the example file.
Any thoughts are appreciated,
Jeff
Solved!
Go to Solution.
Attachments:
Puff timing loop.vi ‏36 KB

Hi Julian,
That occurred to me as well, but I couldn't see it.
After taking the night off, and looking at it again, I noticed that the 'stop' case was executing directly following the 'start' case (within the same iteration of the while loop).
So, it was actually turning on, but then immediately turning off, before any slow-witted human could discern the action.
Thanks for the solution.
Jeff

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Talked to Tech Support about this when my machine locked up in this same fashion. There's a little "door" inside the headphone jack that can get stuck in the open position and keep the audio from switching back to the internal speakers / stuck in the digital (optical) output position...
The solution: the iPick... It's a toothpick, but if you use it to poke around inside the headphone jack until the little door gets unstuck, it becomes an iPick, and a box of them are very expensive, but they come in lovely colors and are very intuitive to use...
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help. I have a Google Hangout in 40mins and my sound seems to have vanished. I went to Sys Prefs and it came up with Digital Out....and the Internal Speakers option is no longer there. How do I reboot, or fix this please?

There are many possible causes for this issue. Take each of the following steps that you haven't already tried. Some may not apply to your model. Back up all data before making any changes.
1. Start with the steps recommended in this support article. Don't skip any of the steps. It's the starting point for further efforts to solve the problem.
2. Make sure you have a fully up-to-date installation of OS X.
3. If you've installed an application called "Memory Clean" or any other third-party software that is supposed to "clean" or "purge" memory automatically, remove it according to the developer's instructions and restart. You should do that even if the software is not causing the problem, because it's useless.
4. Other third-party software that has been reported to interfere with sound output includes "Boom" and "Samsung Kies." If applicable, uninstall according to the developer's instructions (not by dragging something to the Trash.)
5. If an AirPlay device is selected for sound output from iTunes (or from other applications via third-party software such as "Airfoil"), deselect it.
6. Launch the application "Audio MIDI Setup" by entering the first few letters of its name in a Spotlight search and selecting it in the results (it should be at the top.) Select Built-in Output from the list on the left. If the Mute boxes are checked, uncheck them.
7. If a red light is visible in the audio-out port when sound should be playing, the internal switch is stuck in the position for digital output. You may be able to free it by inserting and removing a mini-stereo jack of the proper size. If not, the machine needs to be serviced. Inserting any kind of tool in the port may cause damage that won't be covered by the warranty.
If there's no red light, the switch may still be stuck in the headphone position. Try to free it the same way.
8. Disconnect all wired peripherals except keyboard and mouse, if applicable. If more than one display is connected, disconnect all extra ones. Restart and test.
9. If you have a MacBook Air, turn off Bluetooth and restart.
10. Start up in safe mode. Don't log in; just restart as usual when the login screen appears. When you do, make sure the words "Safe Boot" do not appear in the login screen. If they do, the system is still in safe mode and sound won't work.
11. Reset the NVRAM.
12. Reset the SMC.
13. Triple-click anywhere in the line below on this page to select it:
/Library/Preferences/Audio
Right-click or control-click the highlighted line and select
Services ▹ Reveal in Finder (or just Reveal)
from the contextual menu.* A folder should open with an item selected. Move the selected item to the Trash. You may be prompted for your administrator login password. Restart the computer and empty the Trash. Recreate your settings in the Sound preference pane.
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combination command-C. In the Finder, select
Go ▹ Go to Folder...
from the menu bar and paste into the box that opens by pressing command-V. You won't see what you pasted because a line break is included. Press return.
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Western Digital External Drive and a VERY slow computer. Is my HD failing?

Hello, thank you for looking at my question.
First off, I am NOT very tech-savvy, but I'm willing to research and learn, I'm just afraid to make a mistake and blow up my computer.
I have had my Macbook for 2 years. I have not backed up my hard drive during that time. Bad, I know.
Recently I've noticed my Mac getting slow with the "spinning beach ball" showing up more often and everything getting slower. Usually a reboot will help. Yesterday, for the first time, the reboot took about 8-10 minutes! I figured that wasn't a good sign, so I headed down and picked up an external hard drive (Western Digital Essential model, 1TB) and figured I'd back everything up. I formatted the drive according to the Mac partition model (tech support from WD helped over the phone) and got it going. From 1530 to 0800 this morning, of 52 GB it had only backed up 15.3 GB. The fan was running at high speed the entire afternoon and night. That's about one GB per hour. Is that normal?? Then, it froze and wouldn't respond, or back up at all. Just nothing. I held the power button down and restarted it.
At this point, I am concerned that perhaps the hard drive is failing (hence the speed and fan issues) and that maybe I should be taking it in to a repair shop (we don't live anywhere near an Apple store)
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carroteye wrote:
Hello, thank you for looking at my question.
First off, I am NOT very tech-savvy, but I'm willing to research and learn, I'm just afraid to make a mistake and blow up my computer.
Good! Better to inquire than leap!
I have had my Macbook for 2 years. I have not backed up my hard drive during that time. Bad, I know.
Yup.
That's about one GB per hour. Is that normal?? Then, it froze and wouldn't respond, or back up at all. Just nothing. I held the power button down and restarted it.
No, not normal at all.
At this point, I am concerned that perhaps the hard drive is failing (hence the speed and fan issues) and that maybe I should be taking it in to a repair shop (we don't live anywhere near an Apple store)
Do you think this may be the case? Is there any way to back up my hard drive faster - before it dies? I have two years worth of photos and papers, etc on there, music and such and it would be a tremendous loss if it all crashed.
As slow as that backup was, anything else will be nearly as bad.
There are four common causes of this:
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The drive is failing.
Corrupted directores, etc., in the file system
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|
It's a toss-up; try to diagnose what's wrong, or try to get a backup.
The fastest way to back up, with the least "thrashing" of your hard drive, would be to start up from your Leopard Install disc and use the Restore tab to make a copy of your internal HD on the external.
That will copy any file system problems "as is," but if your internal HD is beginning to fail, at least you'll have a full copy of the data (corrupted or not) on the external HD.
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Here's what I'd recommend:
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3. Use the Restore tab to copy your internal HD (almost certainly named +Macintosh HD)+ to the external HD, per #7 in the link above. Note that will copy the name of the internal HD to the external.
4. When that's done, quit Disk Utility, then select +Startup Disk+ from the Utilities menu in the menubar (per the yellow box above). Select the external HD and start up from it.
|
The copy may take a very long time. There will be a progress bar, but they're notoriously inaccurate under the best of circumstances. If it completes, and you can start up from the external, post back and we'll see if we can find the problem, and either fix it or confirm that you need to take it to Apple.

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I have a theater with a Runco projector but non HDMI. alas, my receiver is non HDMI. Changing electronics and projector is a non-starter.
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Analog in digital in and digital out slow ?

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