PXI_Clk10 synchronization

Hello,
I need to synchronize all DAQ cards within my PXI chassis with the same timebase. I managed to do it by routing 20Mhz timebase of a E-series DAQ board through the PXI_Trig7 line of the PXI bus.
It works great, but now my problem is to do the same in the case of multi-chassis configurations. I would need to connect this clock from one DAQ board of the first chassis to the second one, but this would need specific cabling and I think this way is not the most convenient.
I tried to initially synchronize all the cards on my single PXI chassis system on the 10MHz chassis clock, also known as PXI_Clk10, but I discovered this signal was not available for E-series DAQ boards : I tried to route /6040E_1/PXI_Clk10 and it produces an error.
I only saw this signal was available for M-series board or the (very expensive) PXI 6653 boards.
I do not really understand why this signal is not usable with this generation of DAQ boards, as PXI_Clk10 seems to be part of the PXI standard and multi-chassis synchronization is naturally available through BNC chain connection.
As an alternative, I perform routing of PXI_Clk10 from a M-series board in each chassis to the PXI_Trig7 to be used as timebase reference. It works well but my problem is that some of our systems do not have M-series board available...
Is there a simple way to use PXI_Clk10 for any DAQ board installed in a PXI chassis ?
Message Edité par Inpriser le 08-17-2006 04:17 AM

Thanks to all for the responses. I did figure out the problem, and some limitations with the board. After reconfiguring my VI, I found out from NI that the board cannot simultaneously have synchronized output of a digital line with the trigger based upon the analog input and unlimited, continuous acquisition at the same time. I was able to get an output pulse on PFI 1 synchronized with the trigger created by the digitized input, but only for a finite number of requested acquisitions. This still works because the requested number may be very large, and at my acquisition rate of 2000 per second, I can set it to run for several hours before the acquisition total number is reached.
Thanks again,
Mike Hinckley

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How do I use the PXI_clk10 backplane clock? It's not there!

Hi, folks!
This might seem a trivial question, but I'm completely at a loss here. I have made an RT-project in LV8 which (among other things) samples data continuously from two cards located in a PXI-system. All 32 (16+16) differential channels are used and one task for each card is configured in MAX. Since signal phase is an issue, I need to synchronize both tasks accurately. The lv8 code examples have a couple of VIs that should have been directly applicable to my situation, and I have studied them (and lots of others) in detail.
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I have tried everything. My PXI-settings in MAX, routing signals via PFI-pins (didn't work at all), etc etc.
What is going on? Also: when routing a signal through a pfi-port, does this necessitate connecting the pfi-connectors physically or is the signal routed internally through the backplane? It doesn't help that I use BNC-2110 connector blocks. How can I be sure that the connectors on these blocks actually correspond to the terminals on the cards? I can't find a wiring diagram anywhere on the web.
Some facts: PXI-1031 chassis with PXI-8184 controller (dual boot) and two cards PXI-6229 / PXI-6259. These cards are located in slot 3-4.
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Attachments:
Multi-Device Synch-Analog Input-Cont Acquisition.vi ‏77 KB

All PXI chassis produce PXI_CLK10 on the backplane (from an on-board 10 MHz oscillator), and most of them can also receive a 10 MHz clock from Slot 2 and broadcast that on the backplane. Some models can receive 10 MHz from a BNC connector on the back. Similarly, both 10 MHz and 100 MHz clocks are always available on PXI Express chassis.
Unfortunately, the 6143 and 6133 have no provision to connect to PXI_CLK10. This is likely because the master clock on those boards is 20 MHz, and there may not have been board space or room in the cost budget for a PLL to lock it to 10 MHz. Many other PXI products can use PXI_CLK10, such as the 6120. There is a list of products which use CLK10 and other PXI features here:
http://digital.ni.com/public.nsf/allkb/F4AD3B87DC8CD62E862571E3007042E5
I suspect this list is a little outdated; perhaps someone reading this knows where a more updated version is.
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As indicated in another post, I need to use a common timebase to all cards within my PXI chassis to synchronize my acquisition/generation DAQmx tasks.
I performed that successfully by setting timebases of all boards from the 20MHz timebase of a E-series DAQ board.
I have another system setup where I do not have E-series DAQ boards but only M-series. In this case, I tried to synchronize all the cards with the 10MhzRefClock of a PXI 6254 board. It seemed to work correctly, until I looked at the analog output signal of one PXI 6713 board.
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When synchronizing with a 20MHz timebase, everything is fine, but 10MHz clearly shows this issue. I checked the 6713 documentation, and it seems possible to use a timebase different than 20MHz.
I attached a VI that illustrates the problem : I create a DAQmx task containing 2 AOs, where 10MHz timebase is taken from a M-series DAQ board. A hardware timed single point timing is configured and outputs are updated in a while loop. If you connect a scope to the first analog output, you will see the phenomenon.
Everyting is fine when you select a 20MHz clock as a timebase. 10MHz leads to this issue. I also tried to synchronize through PXI backplane clock (i.e. /6259_1/PXI_Clk10) but it leads to the same problem.
Please note that using the same 10MHz synchronization on DAQ cards (PXI 6040E, 6071E, 6254, 6259...) for AO works perfectly. I only encountered this problem with PXI 6713 board.
Message Edité par Inpriser le 08-18-2006 02:54 AM
Attachments:
Synchro 10 MHz PXI AO.vi ‏34 KB

Inpriser,
You wanted to use the PXI 10MHz clock to synchronize to 6713s using the PXI capabilities. I’m afraid that since the AO series doesn't have a PLL, you won't be able to use the PXI 10 clock.
I made a few search and found this:
“Neither the 6713 nor any of the AO series support PLL synchronization. However, the M-Series does, though in that case you are limited to a smaller number of analog outputs. Regardless, the best option is using an Arb or other card that can use the Star Trigger, or an m-series device with PLL synchronization capabilities.”
For more info’s about how to deal with PXI and PLL, please check this forum:
http://forums.ni.com/ni/board/message?board.id=170&message.id=11986&requireLogin=False
I’m sorry to disappoint you, hoping you’ll manage to deal with that,
Regards,
BRAUD Jean-Philippe
Field Sales Engineer - Nord et Centre France
LabVIEW Certified Developper

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Attachments:
4461-6250ai-6250Ctr.vi ‏1561 KB
Fig 7-8 from M SeriesUserManual.jpg ‏16 KB
CreateTask6250Ctr.vi ‏35 KB

Could I also use the PXI_Clk10 as a "ReferenceClock.Source" for the three tasks in order to synchronize them? I mean, instead of using the "SampleClock" of the AI task of the 6250 and the Ctr tasks of the same device. See the attachment to see what I mean.
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Attachments:
4461-6250ai-6250Ctr - PXI_Clk10.vi ‏1558 KB

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Thanks a lot for any help!
iPod Nano Windows XP iTunes 7

You can delete songs from your iTunes/computer hard drive after transferring them to the iPod, and for this you need to set your iPod to manage the iPod content manually.
However, storing music on your iPod and nowhere else is an extremely risky option because when (and not if) there comes a time to restore your iPod, which is a very common fix for iPod problems, then all the music would be erased. If you no longer have the music in iTunes (or any other back up), then all that music would be lost.
At the very least back up your music to either cd or dvd before deleting it, particularly any purchased music/videos, as this would have to be bought again if it were lost. See this about backing up media.
How to back up your media in iTunes.
What if the iPod were lost/stolen/needed repair? Again, the music would lost. I strongly recommend a back up, and if computer hard drive space is in short supply, you should seriously consider an external hard drive. They are not expensive, and the cost is well worth it when compared to the loss of all your precious music.

Lightroom synchronization trying to drop all my photos

Hello,
I recently installed OSX LR4, and was happily using it for a couple days on an upgraded LR3 catalog, but now when I go to synchronize any folder it will say (for example):
Import new photos (252)
Removing missing photos from catalog (252)
If I click "Show Missing Photos", it shows all the photos, and if I go to "Show In Finder" they are all there and there seems to be no recently modified files or anything suspicious looking. If I go ahead with the synchronization, I lose all the metadata, settings, etc from the photos. I also tried opening the old catalog in LR3 and the same issue exists.
Why is Lightroom doing this? Any ideas how to get around it? File permissions maybe?
Thanks in advance for any help you guys can provide.

It seems related to http://forums.adobe.com/thread/608096
I am not using any special characters and haven't renamed any directories. When I try to create a new catalog, and then import the directory structure from the original, it seems to load up most of the metadata just fine, but in the "Folders" section, some of the subdirectories are shown as being all in lowercase when they aren't that way on the filesystem (e.g. LR shows "nex-5n", the filesystem shows "NEX-5N".
I'm scared of losing all the work I've done on this catalog

LR 2.0 Synchronization hangs

Is anybody else seeing this, hopefully with a solution or workaround?
When I try to synchronize some folders with more than around 120 files, LR shows the progress up to 25% or so in its titlebar, and then - nothing. The percent complete vanishes from the titlebar, and LR never finishes the sync. I left it running Synchronize Folder on a folder with just over 800 images (by its count in the folder panel) for over 8 hours today while I was out of the office, and it never finished even the "Import new photos(counting)" portion. Synchronizing individual sub-folders of that folder with 90-120 files works fine, completing each one in under a minute, but one with 128 files hangs.
Any tips, fixes, or workarounds greatly appreciated!
Jack

> When I try to synchronize some folders with more than around 120 files, LR
> shows the progress up to 25% or so in its titlebar, and then - nothing.
> The percent complete vanishes from the titlebar, and LR never finishes the
> sync. I left it running Synchronize Folder on a folder with just over 800
> images (by its count in the folder panel) for over 8 hours today while I
> was out of the office, and it never finished even the "Import new
> photos(counting)" portion. Synchronizing individual sub-folders of that
> folder with 90-120 files works fine, completing each one in under a
> minute, but one with 128 files hangs.
I discovered similar non-linear performance problems when generating
previews. The time to generate each preview increased as the number of
previews increased. With a small number of previews, LR 2 could generate
one preview per second. As the number of previews increased, the time to
generate a single preview increased to ten seconds per preview, and at
40,000 images, LR 2 could not generate even one preview in several hours.
After a week of trying to get it to work, I finally had to remove LR 2. I'm
waiting for the release that fixes these performance problems.
Best,
Christopher

PXI_Clk10 synchronization

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