Exposure time with externally triggered MC1362 and PCIe-1433

Hi,
I am capturing images using a Mikrotron EoSens CL MC1362 camera and NI PCIe-1433 frame grabber. I have a question about exposure time - which I'm not sure if it is related to the frame grabber, the camera, or the combination, but hopefully someone here can help.
I'm running an external signal to the SMB connector on the frame grabber, and have the camera set to operate in "Pulse width mode", which allows the frame grabber to take control.
My question is:
How do I determine the exposure time from the parameters of the external signal? It's a square wave, and the duty cycle seems to control the exposure time.
I would guess that the exposure time, E= (D/f), where f is the signal frequency and D is the duty cycle? e.g. for f=1kHz and D=80%, the exposure time would be E=0.8ms. Is that correct?
The camera manual can be found here:
http://g4.com.tw/web/file/product/usermanual/995-EoSens%203CL-MC1361-Manual.pdf
and I have included a screenshot of the revelant portions which seem to describe how pulse width works. In particular it says "Exposure time is defined by the width of the external signal". Is that equivalent to my E=D/f idea?
Thanks in advance for any help.

Great, thank you!
"The exposure stays on while the pulse is high." - I basically just wanted to double check this, because it doesn't really say that explicitly in the manual and I find their wording confusing and didn't understand what the three traces in the diagram are.
Thanks again,
Stu

Similar Messages

HT3775 i am trying to watch a movie on Quick time with the extension .FLV and it will not play. I updated my flash.

i am trying to watch a movie on Quick time with the extension .FLV and it will not play. I updated my flash. any suggestions?

Some other programs you can try.
Video Player - Divx
Video Player – Flip4Mac
Video Player - VLC

Hr2000 firmware upgrade troubles with external triggering mode

Hello,
Has anyone had any problems with the latest Ocean Optics HR2000+ firmware upgrade while using external triggering mode?
I'm using the NI-provided drivers for HR2000+ which used to work without a problem before the driver update. My program synchronizes 3 spectrometers so that they continuously acquire spectra at 1 second integration time while being triggered by a pulse generator running at 20 Hz. It used to be that the specs would trigger again only once the previous integration completed, but now the spectrometers try to trigger with each trigger and don't complete the 1 second integration. My code has not changed at all between firmware upgrades, and I expected it to work exactly the same after the upgrade. I've reinstalled all programs, inf, and sys files related to the driver as well.
Do I have to wait for a new NI-Driver update that adjust to the new firmware update? Attached is the driver package I'm using.
Any clues as to what I can do about this?
Thanks,
Mike
Attachments:
Ocean Optics 2000 4000.zip ‏582 KB

Attached is a sample VI for what we're attempting to do. This used to work before the Ocean Optics firmware update.
Attachments:
specs_with_trig_post_firmware_upgrade.vi ‏57 KB

Why do I get lots of noise in my photos on the D30 at long exposure times with 100 ISO speed? Help!

So I'm using a Canon D30 (3.1 megapixel). My ISO speed is set to 100, but when take phots at very slow shutter speeds I get a lot of noise. And I mean a lot. Can anybody help?

Long exposure time is the 2nd main way to get noise in an image. Not a lot you can do other than post processing. How long an exposure? Perhaps a compromise like ISO 200 and a shutter that is half as long (twice as fast) would be slightly better if you played around with it. Or perhaps that would be even worse.
Scott
Canon 6D, Canon T3i, EF 70-200mm L f/2.8 IS mk2; EF 24-105 f/4 L; EF-S 17-55mm f/2.8 IS; EF 85mm f/1.8; Sigma 35mm f/1.4 "Art"; EF 1.4x extender mk. 3; 3x Phottix Mitros+ speedlites
Why do so many people say "fer-tographer"? Do they take "fertographs"?

Trouble with external hard drive and disk repair

So I save my music and photos to an external hard drive. The drive is partitioned to also be the back up for my Time Machine. I live in an old house with the electricity for my MacBook Pro and the external hard drive coming from a wall plug which drapes scrape over when opening and closing, occasionally moving the plugs to the point of cutting off the electricity. Sometimes when that happens, the MacBook Pro won't read the external hard drive and I have to restart the computer for it to read the HD.
Well, this seems to have happened again, only this time it wasn't reading the HD when restarted. I Opened the Disk Utility and did a verify disk, and was told that I couldn't save anything to the drive, but to access the files that were on there. So I attempted to do a disk repair. What happens at that point is instead of getting the solid blue line indicating the repair is happening, I get the barber pole blue line indicating it's trying to access the HD to begin repair. This goes on for hours at a time without the repair taking place.
Can anyone out there give me a "for Dummies" overview of how to get the Disk Utility to repair things?
Thanks.

What I was trying to tell you is that all the music and photos that are on the same drive as your Time Machine backup must also be backed up elsewhere. Unlike all the stuff on your primary (internal) hard drive, those photos and music are not backed up at all unless you have copies of them on a different drive. If your Time Machine hard drive should fail before you do that, they'll all be lost. So copy all the music and photos to your second external hard drive as soon as you are able to do so.
I generally consider the nuisance of backing up extra hard drives to other extra hard drives burdensome and annoying enough so that I always upgrade my primary (internal) hard drive whenever I begin to run short of space on the one I'm using. Now that it's possible to get 750GB and 1TB internal drives for MBPs, I'll get one of those as soon as my present 250GB drive fills up to about 80% of its capacity. I don't want to lug around an external drive in order to have all my stuff with me when I'm away from my home or office — I want it all on my internal drive, and I want to be able to back all of it up at once to an external drive of the same or a larger size. At least until I outgrow a 1TB drive, and I think that will be a while.

Need Help with External Hard drives and too much music

I am not terribly tech-savvy, and I need your help. I have a G5 PPC dual processor with an internal 250GB drive. I have two seagate firewire/USB2 external hard drives. One is 250GB and one is 350GB. I want to know how to use them to get my Mac to run faster and better.
My original hard drive is 7GB shy of being full. Almost half of this is my itunes library which is over 100GB. The older (250GB) hard drive has about 150GB of photos/videos.
My Mac is running slow as molasses and when I power up the external hard drives it slows down to what I recall my original Mac Plus ran like.
I use the G5 primarily to work with photos, illustrations and creating the occasional DVD with video and photos. the apps I use most often are Photoshop, Illustrator and Painter. I always listen to music while work.
I hope all of this information is helpful! Here is my question:
What is the best way for me to set up and use these external hard drives to return my G5 to its original blazing (to me) fast speed?
PPC G5 Mac OS X (10.4.9)

I think you should look at adding two 500GB internal drives. I'd say Maxtor MaxLine Pro for cost, but they also run much warmer (43ºC even when nearly doing zilch) so I'd go with WD RE2 500GB for $40 ea. more.
dump whatever you don't need, trash anything that is hogging space and is just temp file or useless cache. Web browsers can leave behind a ton of small files eating up tens of MBs.
Use SuperDuper to backup/clone your drive.
Disk Warrior 4 to repair (after it gets to 15% free, or just forget for now).
A 250GB drive formats to 240GB and you have ~3% free it looks like.
For every data drive plan to have two backup drives.
Keep your boot drive to 40% used.
And your data drive to 60%.
Backups can go a little higher.
Drives are cheap and inexpensive, especially for the space and performance. And they have improved SATA over the years it has been out.
By doing a backup followed by erasing your drive, and then restoring it, using SuperDuper, which optimizes the organization, skips copying temp files that aren't needed, it also defragments your files. I would do backup daily to different sets that you "rotate." And before any OS update. And do the erase and restore probably every 2 months.
Make sure you keep one drive partition somewhere that is just your disk utility emergency boot drive that is not a copy of working system, used for doing repairs like running Disk Warrior and Disk Utility.
You may need to repair; backup; even erase and restore your external drives. Rather than spend on vendor made case, just pick up a good FireWire case either with drive, or bare (and add your own). I think it'd add 500GB FW drive though.
Why?
To begin backup of your current drive. To leave your other FW drives "as is" for now.
Then install a new internal 500GB drive as well so you now have a good current backup, and you have moved your data off 250GB to 500GB. If anything happens, you have one off line FW backup.
Then begin to clean up, organize, and get your FW drives working. It sure sounds like they have had some directory or file problems.
You can find a lot of Firewire and SATA drive choices over at OWC:
http://www.macsales.com/firewire/

Exposure problem with Lightroom 4 CS5 and Raw 6.7

Hi all
I have recently upgraded from Lightroom 3.6 to the new Lightroom 4 and am genrally pretty happy with it, I tend to use it along with photoshop CS5 extended and also imagenomic Portraiture, but I have found an annoying little problem in doing this and something that I never suffered with when using Lightroom 3.6 and it is this...
when I take an image from Lightroom 4 and click Edit image in Photoshop CS5 and then use Imageonmic to soften skin etc all seems to work well I then carry out any touching up within Photoshop and once finished save it back to lightroom for any final tweaks etc which is fine and all works smoothly, except once I have saved it back to Lightroom the exposure has been pushed up about 3-4 stops at least , meaning I then have to pull it down again and this can sometimes result in extra editing I could do with out. now I know its not the end of the world and is probably just a bug that I'm hoping will be sorted within Lightroom 4 but I just wondered if anyone else has had a similar problem, is it a bug or am I doing something wrong? (although I'm doing the same with Lighroom 4 as i used to do with LIghtroom 3.6 and that worked fine)
Oh one more thing I should mention to get lightroom 4 and CS5 to work properly together I had to go into the Adobe Labs site and download the Camera RAW 6.7 software for CS5 so it could also be a bug here i guess.

There have been several posts over on the Lightroom forum, and other non-Adobe forums also, about this issue: it seems that there's a bug in ACR 6.7RC which causes the image to be over-expose, compared with the setting applied using PV2012 in LR. I guess this is the kind of thing a Release Candidate is supposed to flag up! I was all set to upgrade my own ACR to ensure that PS would recognise my LR4 edits (I normally avoid RC versions and wait for the final), but all the reports of this problem have stopped me from doing so.
In the meantime, best option so far as I'm aware is to process the image in LR (you get the option when you choose to edit in PS), meaning that it does all the rendering before passing it over to PS (otherwise, ACR handles the conversion of the raw file into TIFF). This does however mean that smart-objects and so on are temporarily out of the equation.
I'm sure this will all be resolved pretty soon.
Edit: in fact, one of the posts I mentioned is about ten posts down in this very forum: http://forums.adobe.com/thread/974963?tstart=0
M

Using Apple TV with external hard-drive and Time Capsule

I am trying to figure out the best way to stream movies stored on an external hard-drive.
At the moment, I have my hard-drive connected to my time capsule via USB, and am streaming them through iTunes and Apple TV. However, for this to work, I have to have my laptop on.
Is there a way to have the movies stored on my local network, or on my time capsule, so that I can just watch them without my MacBook having to be on?
I've spent a bit of time researching this on Google, but haven't been able to come up with a good solution, so I'd be grateful if anyone has any cool suggestions.
Thank you.

There isn't a solution, the Apple TV will only read your iTunes library if iTunes is running and will only play content through iTunes.

Does Time Machine only work with external HDD's and Networks?

I have a Mac Mini that I just replaced the optical drive with a hard drive. This second HDD is formated into two partitions, with one of them being for my Time Machine backups, the other a media scratch drive.
When I try to choose this volume in setting up Time Machine, I get an error message that says, +"Are you sure you want to back up to the same disk your original data is on?"+ The message goes on to explain that +"the volume you have chosen for storing backups is on the same disk as the volume containing your data... you should back up to a volume on a different disk."+
The volume that I have selected IS on a different disk than my start-up system drive and the data to be backed up IS NOT on the same disk as the disk storing the backups. System Profiler defines my startup HDD as "BSD Name: disk0" and my second HDD as "disk1," with the two partitions "disk1s2" and "disk1s3." Mount Point for the start-up HDD is "/" and the two partitions on the second HDD are "/Volumes/Scratch Disk" and /Volumes/Time Machine." These two volumes show up as options when I "Choose Backup Disk" in Time Machine, but not the Mini's startup HDD.
Does Time Machine allow the use of second internal HDD? I have an external HDD, but it has a clone of my start-up drive on it. Thanks for any help.

Chris, excluding the other volume could certainly be the issue since the two options that I'm given for a backup volume are both on the same hard disk. The start-up system HDD is not listed. Maybe the message is referring to this, rather than to the start-up disk.
Not until after I selected "use this volume anyway," did I get to the "Option" screen to exclude items from the backup. When I selected "+" I was surprised to find the other volume, Scratch Disk, listed along with the start-up HDD as being included in the backup routine. So I selected Scratch Disk as one of the items to exclude.
As V.K. mentions, the cautionary message is rather vague as to what exactly it is referring to. Thanks.

Time Machine, external hard drive and more

Guys, I am very excited about the release of Leopard and in preparation, want to obtain separate external hards drive for use with Time Machine. I've got a Mac Pro 3Ghz with 3 Terabytes of hard disk space, 4Gig Ram. What would I need in terms of size for an external hard drive (I'm not sure if I will need all the extraneous stuff, maybe just want to back up most of the system files, etc and perhaps some other directories).
Questions:
1. What commercial external USB hard drive should I look at? (I'm not a build-your-own kind of guy.)
2. Should I obtain separate external hard drives for my 24" iMac as well as my C2D MacBook?
3. Should I have the external hard drive in place prior to the Leopard upgrade so Leopard finds it right off the bat?
4. Should I upgrade my RAM on the Mac Pro to 6 or 8 Gig? Is that necessary or needed?
5. When I receive Leopard (I bought the family pack because I have so many Macs) will it install over my current Tiger system leaving everything in place or do I have to start from scratch (I can't believe Apple would do that to us!).
Thanks. You guys are always the best Tech support!
John

Hi Adam Jackson, nice site you have and thank you for taking the time/effort to provide the information. It is very informative and valuable!
1. I notice that other people have good luck with LaCie products so I bought the 1Terabyte external. I see it on Google for $322 and not real concerned about the cost.
2. The 24" iMac is the C2D version as is the MacBook. I actually sold my earlier models on eBay to buy the C2D models because I wanted 802.11n. Both machines are pimped out to max, including the MacBook w/3Gig of RAM. Now my Mac Pro came with Airport Extreme built-in and I have it turned on so my other machines can share the connection via WiFi. That is very cool.
I was wondering if I would have to buy separate externals for Time Machine (TM) backups on those machines but you answer is great! I'll partition up the external hard drive. A new question about doing that is: do I move the external hard drive to each machine each time I want to backup? If so, I assume TM will allow me to backup manually and I could plug in the external HD on the iMac, and then move it to the MacBook and return the external to the Mac Pro as home base, backing up to the appropriate partition. Does that sound right? Or can I do it all via WiFi (THAT would be way cool!).
Another question. You recommend installing Leopard to a clean drive. I hesitate there because I have so many programs already installed under Tiger from Final Cut Pro, Aperature, and many that are either too hard to find or no longer available or it would be painful finding the reg or serial numbers. Is it possible to back up all of those programs and their associated preferences/library/passwords/reg codes/ and just add them back after I have Leopard installed?
My thought here is to make sure all of my apps are up-to-date then, back up all of the applications to the appropriate external hard drive partition, make a bootable Carbon Clone Copy as you suggest for safety purposes, wipe out the Mac Pro/iMac and MacBook hard drives and install Leopard on each machine. Once all machines have Leopard then copy back the working applications. I just don't know how to do that successfully, i.e., which user folders to backup.
And thanks again,
John

Time Machine, External Hard drive, and the Windows Partition

Is it possible for me to back up my mac with Time machine, and also back up my windows partition on the same HD? I just got the External HD today, so I'm very new at this. Thanks for your help.

Time machine does not work with windows drives.
however the way I have backed up my bootcamp partition is to use diskutility to make a dmg of the windows partition. I then only make regular backups of my user account on the windows partition.
You could partition the new external drive and make 1 partition hfs+ and the other fat32. Then when booted into windows it will see the fat32 partition on the external drive. Then you can carry out backups from within windows to that partition.
Timemachine will backup your mac partition with no problems.

Mac book pro doesn't wake up every other time with external monitor

It is related to 'Put display to sleep' as I managed to find out. When you have 'put display to sleep' turned on, every other time screen doest turn back on, nor external nor internal, sometimes internal lits up and there is just blue screen, not desktop. You can't do anything except turning notebook off. No mouse, no keyboard, nothing, there is no mouse pointer either. I didn't experiment without external monitor, though, maybe it hangs up too.
This thing did cost me $2800. Can it atleast work as it supposed too?
I set it to 'never sleep', 'never sleep display', but frankly, it *****. When I need to go out, I just turn monitor off.
Is apple doing anything to resolve that issue? Do they read these forums?

Tried resetting SMC?
    Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own".
Best.

Troubles with external hard-drive and iPad

Hi,
First post and all that. Thanks for taking the time to help me out.
I've recently bought my iPad, and while most things work especially well, one issue is really bugging me. The majority of my media is stored on an Iomega 1TB external hard drive, connected via USB to my computer. I'm running Windows XP and iTunes 9.2. When I hook up the iPad to the computer, iTunes loads, starts to sync the iPad with the music from the external HDD and suddenly I get a message saying "the device is not recognised" by the computer. The HDD has dropped off the radar. I've tried different things to get them to talk to each other, but to no avail.
Could someone help me please, to get my precious music off the external HDD? It's bugging me!
Cheers!

Thanks, I'll try connecting the HDD to the front USB ports and the iPad to the back. I did some more digging after posting here (my search-fu is weak!) and found a similar suggestion.
The HDD is indeed independently powered, so I wasn't sure of the power issue, but I'll check it out.
As to more info, the iPod Touch I have doesn't cause the same problems. And I can't transfer the media to the iTunes location, since that's on my first hard drive and I don't have enough space (hence the external one! :oD)
Cheers all!

Help with external hard drive and firewire?

2 questions: 1) Does anyone know if there is a hub made for the firewire 800 to allow more than 1 device to be hooked up at 1 time? ex... capture deck and external hard drive.
2) I was cleaning up my external hard drive. I ejected it and now it won't come back on line when it is plugged in. Any Advice?

Most external FW enclosures have 2xFW800 ports that allow daisy-chaining multiple drives.
There are FW800 hubs available, but I don't recommend them if you intend to use with a camcorder or deck. Ditto regarding daisy-chaining a camcorder or deck with a FW drive ... the camcorder/deck usually locks up the FW bus if you have daisy-chained it with a FW drive.

Start up with external Drive connected and switched on

When starting up with my external USB2 drive connected, it takes ages, I usually resort to switching it off and then back on when my Mac has started. Has anyone got any tips on how to speed up the start up process?
Cheers

Sounds like it may well be the photos (or more likely any video in iphoto) rather than the drive that is causing the issues.
Have you installed all the updates for imovie including the ilife compatibility update.

Exposure time with externally triggered MC1362 and PCIe-1433

Similar Messages

Maybe you are looking for