Continuous square wave signal with time high pulses between 1 and 2 ms

Hi,
I need to generate a wave signal with time high pulses between 1 and 2 ms. I am trying to use the pwm on a digital output (Inhibit) but nothing happens.
I am using a PCI7330 and UMI 7764.
My labview version is 8.2.
Does someone have an example how to generate it?
Best regards

Similar Messages

Is it possible to detect low frequency signals with a high sampling rate?

Hello everyone,
I'm having an issue detecting low frequency signals with a high sampling rate. Shouldn't I be able to detect the frequencies as long as the sampling rate is at least 2 times the highest frequency I will measure? The frequency range I am measuring is 5-25 Hz, and I use Extract Single Tone.vi to measure the frequency. The sampling setting I am using is 2 samples at 10 kHz. Is there a method I can use to make this work?
Attached is the vi.
Attachments:
frequencytest.vi ‏21 KB

You are sampling at 10Ks/S, but only taking two samples. What do you expect to see? If your signals are binary (On or Off) you would only see either an on or an off, or if the rise/fall time was fast and you were Extremely lucky, one of each. If you want to see a waveform you have to sample for at least the period of a waveform. So you should take samples for at least 0.2 seconds to capture an entire waveform at 5Hz, ideally longer. Think of looking at a tide change at a dock. If you want to see the entire tide change you will probably have to measure repeatedly over 24 hours, not just run out on the dock, measure the height twice and leave. That wouldn't tell you anything other than at that precise moment the tide height was X, but not that it was at high tide, low tide, in between, etc.
I type too slowly, I see that a more technical answer has been given, so mine will be the philosophical one!
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion

I have a new Macbook Air and for the last few days the fan had run continuously, this is the first time it has ever run, and now it won't stop, the fan starts up as soon as I turn it on. The computer is not hot.Any ideas on how I can fix this please ?

I have a new Macbook Air, 6 months old, and for the last few days the fan had run continuously, this is the first time it has ever run, and now it won't stop, the fan starts up as soon as I turn it on and the computer seems to running more slowy.The computer is not hot but I am worried it may burn out,.Any ideas on how I can fix this please ?

Hello dwb,
Here is the screen shot, just the top half, there are another 10 pages, but I guess this should enough for you to have an idea of waht is going on, bit small I am afraid. No, I don't have any apps setup to run when I open my computer, the kernel, varies between 290 and 305 per cent ish.
Would that PRAM thing help ? I think it may be the computer itself, well something inside, as this the first time that the fan has ever started running since I have this computer, even when I have 3 or 4 apps running.
Thank you again for your advice,
Regard,
Beauty of Bath

I try to backup my Macbook with Time machine, it goes fine and at the end it says that it could not be completed because "/Volumes/Data-2/ MacBook.sparsebundle is already in use".. What is that?!

I try to backup my Macbook with Time machine, it goes fine and at the end it says that it could not be completed because "/Volumes/Data-2/ MacBook.sparsebundle is already in use".. What is that?!

See #C12 in Time Machine - Troubleshooting

Every time I toggle between silent and regular sound the sound effects disappear on mail how do I fix it?

Every time I toggle between silent and regular sound the sound effects disappear on mail how do I fix it?

With headphones?
With speaker?
Try:
- Reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Reset all settings
Go to Settings > General > Reset and tap Reset All Settings.
All your preferences and settings are reset. Information (such as contacts and calendars) and media (such as songs and videos) aren’t affected.
- Restore from backup. See:
iOS: How to back up
- Restore to factory settings/new iOS device.
If still problem, make an appointment at the Genius Bar of an Apple store since it appears you have a hardware problem.
Apple Retail Store - Genius Bar

Write signal with time stamp

hii...
I've a student project to read and write data from a continous signal with labVIEW.. I'm going to read the system for 24/7, The reading program already finished.
The problem is in the writing procces.. I have no idea how to write data to file with low level vi.. I'm new in LabVIEW and I already try some modification to my program but it still don't work as i want.
I want the writing procces only occur when i press the button and it only run for a few second with constant time stamp.. It just to check if there are any data missing or not.. The system are a fast (It's what make problem bigger).
I'm getting crazy at all.. If some one could help me i will be very grateful... I'm using LabVIEW 8.5 and PCI 6259...
Kind Regards,
Dani
-Keep Learning-
Attachments:
Read Circle Encoder.gif ‏22 KB

Hi Dani,
here's the two-loop version...
When you use the local you wouldn't need the queue at all... But using locals may lead to race conditions (not in your simple vi, but general) - locals don't provide "atomic" data access.
In Labview the wire is equivalent to variables in text programming languages!
The vi uses the producer-consumer-scheme (Erzeuger-Verbraucher-Struktur ?): one loop is producing values, the other is consuming them. It's a common scheme in LV programming, you will find examples and a lot of threads here in the forum.
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome
Attachments:
circle.vi ‏48 KB

Errors with Time Machine (not completing backup, and needing to erase the ".inProgress" package)

I have in a previous discussion been talking about errors with my Time Machine backup. The errors were with a problem with Indexing a file, it fails and stops the whole backup. Each time it attemps another backup, it fills my ".inProgress" package with a (nearly) whole backup, filling my Time Machine hard drive, and thus errasing my previous good backups. The error occurs after about 95% completion.
In my last post of a similar disscussion, the problem was indexing the Preference Pane files and this caused the whole backup to fail. This was my last post there: (below in some additional info of my situation)
I did exclude the MobileMe.prefPane. And I got:
12/16/11 9:24:50.468 PM com.apple.backupd: Starting standard backup
12/16/11 9:24:50.556 PM com.apple.backupd: Backing up to: /Volumes/3 TB GoFlex Drive/Backups.backupdb
12/16/11 9:25:14.418 PM com.apple.backupd: Waiting for index to be ready (101)
12/16/11 9:27:02.366 PM com.apple.backupd: Deep event scan at path:/ reason:must scan subdirs|
12/16/11 9:27:02.366 PM com.apple.backupd: Finished scan
12/16/11 9:33:37.119 PM com.apple.backupd: Deep event scan at path:/Volumes/Mac OS Lion GM reason:must scan subdirs|
12/16/11 9:33:37.119 PM com.apple.backupd: Finished scan
12/16/11 9:36:15.650 PM com.apple.backupd: 758.92 GB required (including padding), 830.32 GB available
12/16/11 10:25:14.873 PM com.apple.backupd: Copied 22.8 GB of 630.5 GB, 782749 of 2357620 items
12/16/11 11:25:15.335 PM com.apple.backupd: Copied 86.6 GB of 630.5 GB, 1167675 of 2357620 items
12/17/11 12:25:16.227 AM com.apple.backupd: Copied 152.2 GB of 630.5 GB, 1393795 of 2357620 items
Dec 17 01:25:16 Thomas-P-Kellys-iMac com.apple.backupd[99858]: Copied 305.2 GB of 630.5 GB, 1413946 of 2357620 items
Dec 17 02:25:16 Thomas-P-Kellys-iMac com.apple.backupd[99858]: Copied 457.1 GB of 630.5 GB, 1419190 of 2357620 items
Dec 17 03:19:07 Thomas-P-Kellys-iMac com.apple.backupd[99858]: Copied 1736865 files (568.3 GB) from volume Macintosh HD.
Dec 17 03:25:16 Thomas-P-Kellys-iMac com.apple.backupd[99858]: Copied 572.1 GB of 630.5 GB, 1848939 of 2357620 items
Dec 17 03:40:33 Thomas-P-Kellys-iMac com.apple.backupd[99858]: Indexing a file failed. Returned 200 for: /Volumes/Mac OS Lion GM/System/Library/PreferencePanes/Mouse.prefPane, /Volumes/3 TB GoFlex Drive/Backups.backupdb/Tom iMac/2011-12-14-171406.inProgress/7DB524DD-EFB9-42A6-8A21-0A2A312EDA6D/Mac OS Lion GM/System/Library/PreferencePanes/Mouse.prefPane
Dec 17 03:40:33 Thomas-P-Kellys-iMac com.apple.backupd[99858]: Aborting backup because indexing a file failed.
Dec 17 03:40:33 Thomas-P-Kellys-iMac com.apple.backupd[99858]: Stopping backup.
Dec 17 03:40:33 Thomas-P-Kellys-iMac com.apple.backupd[99858]: Copied 2164998 files (581.1 GB) from volume Mac OS Lion GM.
Dec 17 03:40:33 Thomas-P-Kellys-iMac com.apple.backupd[99858]: Copy stage failed with error:11
Dec 17 03:40:50 Thomas-P-Kellys-iMac com.apple.backupd[99858]: Backup failed with error: 11
This time it was the Mouse.prefPane that caused the error. I'd like to exclude the entire PreferencePanes directory.
This was my error message this time:
I just realized this was on my small Developers partition. Perhaps there is an error with the build, OR an error with the initial restore. I'd like to perhaps exclude the entire /Volumes/Mac OS Lion GM. I expect that Time Machine is working fine with my main partition and the error happens when it's almost done with the Mac OS Lion GM partition.
The problem now is that I only have 265 GB of 3 TB available on my Time Machine HDD. If attempt another backup, it'll surely erase about 410 GB of my past saved backups. I've already lost 6 months, and I only have two months left of backups. I need to erase the ".inProgress" package again. That'll take time, and it's impossible to do from this main partition, even at root access. This ".inProgress" has a total of two (nearly) full backups; it didn't cleanup the first full backup attempt while starting the second,perhaps it would have had it finished. But I fear even if I exclude the whole "Mac OS Lion GM" partition, It'll create a third full backup before cleanup and erase ~400 GB of previous good backups. Then, I'll have a total of 4 (nearly) full backups! 3 TB is just enough without any past backups.
Maybe I'll just copy my documentations of my 'errasing the ".inProgress" package' last time (from the Mac OS Lion GM partition) and do a full restore of just that partition. Thus erasing the errors all together. If it doesn't fix the errors then this could be a bug in the build that doesn't allow Time Machine to work. I've always included this partition in Time Machine before, even with other Lion builds, so I suspect that it was an error in the initial restore. (I may be answering my own questions, and that the inital restore (of the small partition) is the problem, and I just need to re-restore the small partition)
Again, I'm going to have to erase the ".inProgress" file to regain 1.53 TB of space before proceeding.
Also, I gave myself permission to read the ".Backup.345781513.887697.log", the log that was created last night when I first started Time Machine this last time. It was interesting, but didn't show the error I could see from the console.
Right now, mds and mdworker appear to be going crazy even after I just now turned off Time Machine. I think I'll let it go for the rest of the night. Then I'll work on erasing the ".inProgress" package from the other partition boot up.
That was my entire last post. To add some information, I have two OS X partitons, both Mac OS X Lion. One is my large main partition, the other is one I don't mind testing with. I recently replaced my internal hard drive in my iMac and restored from Time Machine both partitions. This appeared to go smoothly. But I have yet to create a single successful Time Machine backup since. At first it was doing a Full Backup, which I didn't like, but now it just aborts around 95% completion. Each, time, it tries it fills the Time Machine hard drive with duplicate (nearly) full backups errasing my older good backups. I would like to erase the ".inProgress" file to save space.
My main question in this new discussion is does anyone know of a good way of erasing the ".inProgress" file? This is so I can preseerve my previous backups. ACLs and other permissions seem to make it impossible to erase from this startup partition, the one I'm running Time Machine from. Even at root level, if I give myself permission to change permissions or delete a file, it'll say Operation not Permitted instead of Permission Denied. I have been able to delete this ".inProgress" package before when booting from the other partition, but with great difficulty. I have had much help from another Member in this Support Community when it comes to solving my Time Machine problems. I think I have found the problem (indexing files in my small OS X partition), as stated in my copy& pasted post above, but I really need to delete this inProgress package first to save space before continuing!

Pondini wrote:
Gator TPK wrote:
Now I'll have to fix the small partition? How's the best way to do this? There could be thousands of files that won't index fine.
See if there's anything you haven't done, that applies, in the pink box of #C3 in Time Machine - Troubleshooting
Otherwise, since most (or all?) of the indexing errors are in OSX, you might want to just reinstall it. Something may have gone wrong sometime, that damaged those files.
I reviewed #C3 in Time Machine - Troubleshooting and I have already done most of those things. I have just learned something new though:
When I included my Main OS X partition again, I got an indexing error for the first time for that partition. I might be interesting to note that the _spotlight process was running, and it's running again (the magnifying glass has a dot and it generically says "Indexing Tom's iMac"). mdworker, mds and backupd processes really are working hard, one moment they used over 500% of my CPU. It's nice to know for once quad core is good for something other than video encoding. (Now if they could just get the Finder to do more than 100.1%, only 1 thread is doing 100%, I'd like to see file size calculations 8 times quicker!)
I never got an indexing error once in the past 2 weeks for that large Mac OS X v10.7.2 main volume, and it had appeared to finish that partition backup before running into problems with my smaller test partition. Also, I had just updated the smaller test partition with a later build of Mac OS X. But It appears that the beta builds are clearly not the problem. I thought I could just restore again (from the December 4th backup) the small partition and both would be fine.
I'll finish reviewing all the suggestions on Time Machine - Troubleshooting and go from there. Hopefully, the _spotlight indexing simutaniously was the only problem. It's strange that the indexing hasn't happened since the original restore last week untill I finally got a good clean complete partial Time Machine backup. Why would the first Time Machine backup trigger indexing again?
For now, I'm going to exclude the Main Partition again, and let another good backup run. And try your suggestions. (And wait till mds, mdworker, etc. to finish!)
I have the logs of the first two sucsessful backups and the last two failed backups from the last 3 hours, if that would help.?

Issues with Time Machine File Restore Permissions and Interface

Hi All,I bought a Time Capsule in January 2010, and i've had backups since then.
Time Machine's interface has pretty much always been laggy as ****, but I've always put that down to using it over wifi, perhaps that was a wrong assumption.
Anyway, I went to open a folder in a virtual machine which resides in my mac's documents folder, and it wasn't there. Sure enough this folder wasn't in my documents folder, so I thought i'd restore it from time machine. Time machine shows every segment as a pink fully coloured one (signalling theres a backup there) for a few secs, before most of them turn into a pale pink. Looking into the issue further, it seems as though I don't have permission to access the documents folder on a lot of backups, by looking at the users/brett/ folders on them (which i do have access to), right clicking on the restricted folder shows that everyone has no access, and it's fetching the other user. Trying to add myself to it doesn't work.
I have gone through two MBPs with the same backup set, and a number of hard drives (the latest being a SSD I put in yesterday, and the migration assistant restore from time machine worked without skipping a beat - never had a problem doing full restores or migrations, just using the interface)
Obviously the easiest thing to do would be to start afresh, but I'd rather not as I'd lose 2 years worth of backups, and who's to say this wouldn't just happen again in the future? Could this be why the interface is so slow too?
Thanks guys

studentguy wrote:
Time Machine's interface has pretty much always been laggy as ****, but I've always put that down to using it over wifi, perhaps that was a wrong assumption.
Yes, there is a lot going on to "populate" the display -- it can be sluggish even to a FireWire 800 drive.
Looking into the issue further, it seems as though I don't have permission to access the documents folder on a lot of backups, by looking at the users/brett/ folders on them (which i do have access to), right clicking on the restricted folder shows that everyone has no access, and it's fetching the other user. Trying to add myself to it doesn't work.
I don't do Windoze, so am not familiar with the structure of the VM files, or how the permissions on them work. Many folks exclude them from Time Machine, and back them up separately.
I have gone through two MBPs with the same backup set, and a number of hard drives (the latest being a SSD I put in yesterday, and the migration assistant restore from time machine worked without skipping a beat
Yes, because it simply copies whatever permissions are there. It doesn't need to (and shouldn't) check whether the logged-on user has permission to anything.
Could this be why the interface is so slow too?
It could be a contributor.
Can you set the permissions on the VM files on your Mac so everyone has read rights? That should at least allow you to restore their backups.

Mac Book Pro 17" 2006 version won't pick wireless signal with Airport update 7.5.2 and later.

My 2006 old 17" Mac Book pro is won't connect to Airport Extreme older version with update 7.5.2 and also with 7.6.2. In fact if I implement that update airport extreme will transmit over channel 100 which my Mac pro is unable to pick. Any advise ?
Thanks.

Thanks "a brody" ! Now I know I am talking to someone who knows the problem; I have checked with the site you advised me and I can tell you that my 17"MacBokk Pro (I am sorry for the mistake on first message) is one of them; in fact I have purchased that Airport Extreme 802.11n Enabler. However I forgot to tell you that my Airport Extreme base is transmitting at 5Ghz with the n protocol and my MacBook Pro has been working very well utill I tryed to update the Airport base to that 7.5.2 version: at that point my MacBook has never been able to pick the signal any more unless going backward to 7.4.2. In doing some experiments, I have found that with version 7.4.2, my Mac was picking the 5Ghz signal at channel # 44, instead, with the update 7.5.2 and later, the base started to transmit to channel # 100 and it looks like my MacBook is unable to go over the 44 channel ! (one more thing: my Mac has Leopard 10.5.8 OS). I have tryed to change the channel in the Airport base back to # 44, but my model (my Airport Extreme base is not the last model) do not allow to change the channel selection to "manual": there is only one selection "automatic". This is why I tryed to see if my Airport Extreme card (Wireless card firmware version 1.4.16.2) was not fit to received and transmit data on channels over 44.
If you have any idea that will be greatly appreciated; any how thank you very much for your time and help.

Time zone problem between mac and windows

i'm running os x snow leopard on one partition and windows 7 on another on a 2008 mbp. whenever i log into windows and then get back onto mac, my time is completely off. i can temporarily fix it by removing the local time file, which resets it, but every time i log into windows and back i get the same problem. i've tried turning off the automatic time zone, tried turning off auto everything and just setting the time myself and it always goes back to being messed up after a trip to the windows partition.
anybody got a fix?

For windows users can you create a connection key in Windows machine and send the same.

Trouble with WPA in WDS between AE and WRT54G

Hi folks, I've have WDS with my AEBS as a remote base station and a Linksys WRT54G as the main base station. I've be running smoothly with 128 bit WEP encryption for about 6 months, so last weekend I tried upgrading the network to WPA personal .
As soon as I go to WPA the AEBS stops talking to the WRT54G. My G4 powerbook can get an get an IP address directly from the WRT54G (when it's in range) so I'm confident the WPA password is correct. Other than changing the wireless security settings I left the AEBS configuration the same as was working for WEP.
I'm running Airport Admin 4.2 and I've tried both firmware 5.6 and 5.5.1 -- same problem in each case. No connection between AEBS and WRT54G.
I had hoped the AEBS would send and error messages to the system console, but so far I have found no useful diagnostic to debug this problem.
Anyone out there get WPA encryption working for a wireless distribution system between AEBS and WRT54G ?
Thanks,
David

Thanks for the reply Henry.
Hmm... I'm running WRT54G firmware version: v4.20.6, May. 26, 2005.
The SSID's are the same (WEP still works) and personal WPA in the WRT54G is set up using a pre-shared key and TKIP algorithm.
And yet still with DHCP turned on I see that my AEBS is generating "local" IP addresses 256.xxx.xxx.xxx rather than getting an address from the range served by the WRT54G. Since this same configuration work using 128 bit WEP I'm assuming the issue is that the AEBS and WRT54G aren't talking properly.
Do you have a pointer to the previous discussion that suggested WPA on an Linksys AEBS WDS is possible? ... maybe I can contact the author directly.
Thanks again,
David

Two harmonic signals with time difference to one modulated signal

Hi LabView experts,
I'm not realy good in using lab view, but I need the visualisation for my diploma thesis.
I know how to creat a sin wave and I know how to creat a modluated signal out of to different sin waves.
but I want to creat a modulated signal where the HF signal is starting later.
So first you have the low frequency sin wave and maybe after one sec. the high frequency signal will be modluated on top.
It would be great if someone could tell me how to do that.
unfortunately I'm using labview 7.1 so I will not be able to open newer files..
thank you very much!!

It's a bit long to explain what you did wrong..
First thing.. STAY AWAY FROM STACKED SEQUENCES!!! Sorry for shouting! But I keep praying that NI will remove those horrible things!
Stacked Sequences are annoying because they make you loose sight of the dataflow that goes on inside the code. Forcing sequential actions is not a good thing in Labview.
Have a look at the attached code. It will do what you wanted. It can still be improved, such as changing the For Loop to a While Loop and have the graph update as run run the VI, instead of a fixed number of iterations.
Let me know how it goes..
RayR
Message Edited by JoeLabView on 06-13-2008 08:43 AM
Attachments:
modulation.vi ‏30 KB
waveform.PNG ‏22 KB

I pod tuch 5th gen has a good wifi signal but times out on app store and many other apps

I received a new ipod tuch 5th gen for christmas, started using it a few days ago and noticed dspite the fact it has a good wifi connection, it keeps timing out especially with the app store but many apps as well.If I try to install an app, I have to try sometimes 10 times or more just to get the download going.I'd appreciate any suggestion can't
Popular Tags: Below is a list of frequently used tags in this community.

I have taken it back to the Apple store genius bar, but they say they don't see anything wrong. Well unless you use it all day and experience the problems when they happen, you wont see anything wrong. But there are lots wrong with it. But this would be the same store as I purchased the phone. And they backed up my old Iphone 4, but were not able to get anything to load back onto my new phone. So, I lost pretty much everything. But over time, some of my contacts have started showing up, although i am still missing over 800 of them.

Display contents of a loop with time gaps in between

Hi,
I have a peculiar problem.
Consider a "for" loop
for ( i in 1..10)
In the above loop i want to display each value of "i" after a certain time span ( say, 1 sec).
In java, i could have used a "delay" function,but i do not know as how to achieve the same in javafx.
Please help me.
Thanks in advance.

Something like that probably:
def seq:Integer[] = [1..10];
var bound:Integer = 0;
def anim:PauseTransition = PauseTransition {
duration: 1s
repeatCount: sizeof seq
action: function():Void {
    var m:String = "";
    for (i in [0..bound]) {
      m = "{m} {seq}";
msg = m.trim();
bound++;
anim.play();

Problem with Time Machine/Finder not finding and (keeping) remote drive

I have a Mac Pro and hooked 2 Western Digital My Book 750GB drives via Firewire onto it to use as my time machine backup for the two MBP's in the house.
The problem I run into may be more network related than Time Machine related. I have the file sharing turned on in Mac OS 10.5.2. I am able to select Mac Pro in Finder on each MBP and then under that select my Time Machine drive. Then within Time Machine I can select the My Book as my Time Machine drive. At this point I have no problem using Time Machine.
Where the problem occurs is if I use Finder to browse other drives such as an Internal Drive I have in my MBP or my Mac Mini's drive it no longer can find the Time Machine drive. It just is like it loses sight of it somehow. All I need to do is once again go to Finder/Mac Pro and then select the specific Time Machine drive and then Time Machine is fine again.
How can I get around this? It seems i have to make some type of permanent logon or so to this drive.

1. try plugging in directly (think you did this already)
2. try a different cable - switch to the one you know works.
3. try a different port on the case.
4. does the faulty one power up at all? can you hear the drive spinning?
5. try switching to the good power adapter if you are not seeing action under #4.
there may also be a reset button on the board or case.
if these are not working, then the bridgeboard has died in the case. there is a board that the drive plugs into that gives you the firewire, usb connections, etc. the drive likely hasn't failed, you just need a new bridgeboard or case, as I doubt maxtor will sell you just that part. the drive can be pulled & put into another case.
check out macsales.com if you need a new case.

Continuous square wave signal with time high pulses between 1 and 2 ms

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