External time base changes with velocity

Hi everybody
I am using output channel A of a quadrature TTL encoder as external time base of the acquisition of three analog input signals. I acquire a total of 1024 scans, one scan for one pulse of the encoder. I use this system to acquire signal from an internal combustion engine. When the velocity of the engine is 1700 rpm, my system acquires the number of cycles of the signals that I expect. But when the velocity is 2000 rpm (or more) my system acquires more cycles altough the number of scans don´t change. It is like the board (or anything) doesn´t read all the pulses of the encoder). I use LabView 5.0 and the example: "Acquire N Scans ExtScanClk D-Trig.vi" for my acquisition. My board is PCI 6023-E.
Have anybody any idea w
hat should I do? I appreciate your help.

Wayuu,
according to what you say, it seems fairly clear that the board is not missing pulses and that those pulses are a clean signal.
What comes to my mind now is... Why do you say that you get more cycles? I mean, if you always get the number of samples you request, what's the problem? Maybe a delay between channels?
If that's the case, then it may have something to do with the interchannel delay parameter.
You can change the value of this parameter with the AI Config vi.
I would first check these links below that talk about it, and see if the behavior you are seeing is just an effect of your board having a unique ADC and hence a delay between samples of different channels.
http://digital.ni.com/public.nsf/websearch/9AE87416C8792FC286256
D190058C7D3?OpenDocument
http://zone.ni.com/devzone/devzone.nsf/webcategories/E8C00D6CC2BDD44386256882001425DA?opendocument&node=
Regards,

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Using external time base on PCI-MIO-16XE-50

What is frequency of the internal time base of PCI-MIO-16XE-50? How can I replace it with my external timebase ( a pulse signal from an atom clock)?
Also after replacing the internal timebase with external one, the scan rate and channel convert rate will be based on this external timebase automatically, right? For example, I define 1000 scan/s on AI0-AI8, it will be a scan rate based on the external timebase?

The AI Clock Config.vi can be used to set the scan clock rate. If a person wishes to change the boards internal time base to an external one, the method described in http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/5601c8268d625a3c86256cf50071199d?OpenDocument is the way to do this.
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Can I use AI clcock config.vi to set external time base

DAQ PCI-MIO-16XE-50 board
According to NI website, I can use "Alternate Clcok rate spec in AI clock config.vi" to set scan clock using external timebase. Does this method in fact change the DAQ cards Master Timebase?
According to NI, I can use RTSI to change the DAQ cards Master Timebase, then all on board clock will be based on the external timebase.
Do the two methods have the same result of changing the DAQ card Master Timebase?

Hi May Lee,
I have some answers for you.
(1) I've never used SISOURCE before, but if it was found on our website, it should work. Assuming SISOURCE accepts an external clock source, that is correct. Scan clock will be set as the external scan rate, and Traditional NI-DAQ will select the fastest channel clock possible except for a minimal 10 microsecond interchannel delay (to allow for settling time for the amplifier and any unaccounted factors). If the scan rate is too fast for Traditional NI-DAQ to apply the 10 microsecond delay and still sample every channel before the next scan clock, than the delay will not be added. Also, if you specify the channel clock rate, the delay is not added.
(2) I'm confused what you mean by setting the channel clock using the internal timebase. If you use the internal timebase of 20MHz as your channel clock rate, this sets the interchannel delay at 50ns. To acquire accurate data, the signal must settle within an accuracy range before the A/D conversion takes place. This is called the settling time. Consult the settling time specifications of your device to see if it can acquire that quickly. Most boards typically have microsecond values.
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I've included an example from a PowerPoint presentation below. Let me know if this doesn't resolve the issue,
Chad AE
Applications Engineer - National Instruments
Attachments:
External_Clocking_(AI).ppt ‏143 KB

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ddudge12,
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Attachments:
80MHz Source.gif ‏6 KB

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apikoros wrote:
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N.Korean hackers.
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http://pondini.org/TM/Time_Capsule.html
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Go to the TM and reselect the backup target disk as the TC.
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Belinda,
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This should have been posted in the late model forum. Sorry.

tsoup2u wrote:
Can I use disk utility to partition once plug in HD?
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http://discussions.apple.com/thread.jspa?messageID=9423426&#9423426

With Time Machine I have an external hard drive formatted with Mac

With Time Machine I have an external hard drive formatted with Mac. The record contained files windows. How to recover?
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I'm having a difficult time following, I understand English isn't your native language. You may have good luck with Google Translate.
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Sirs or madams,
Is my Powerbook G4 12” PPC 10.5.8 'bootable' with a Western Digital My Book Studio Desktop 3TB Hard Drive - FW 400/800, USB 2.0, Apple Time Machine Ready external hard drive? Western Digital says officially no, but that it MIGHT be. I primarily live in China and bought a datastorage.com.cn Clearlight s400+ external hard drive enclosure with a 320GB disk drive a few years ago in China. My computer 'boots' fine from it, but since I got it in China all the paperwork, etc. is in Chinese; my Chinese isn't quite sufficient enough yet to read it. But there are references to something called "SATA", whatever that is.
My level of computer 'under the hood' knowledge is extremely low. I've been told that SATA has some relationship as to whether or not an external hard drive will boot a computer via the Firewire connection, something relating to 'interface', which I assume is how separate electronic gadgets work, or don't work, with each other.
I frankly don't care much for computers, the internet, or their related gadgets such as all these fancy phones. I longingly reminisce about the days when there were no such things. I use a computer & the internet because I have to, and unfortunately unlike a car where one doesn't have to have 'under the hood' knowledge to operate it, just knowledge of the steering wheel, brake, gas, etc., one seemingly must know a ridiculously great amount of 'under the hood' knowledge, including jargon, to operate computers.
So, please try to respond accordingly; thank you.
If this particular external hard drive won't, for certain, be bootable with my computer, can you advise as to what readily available brand/model would be in the 3TB range for a similar price, roughly $150ish??
Thank you very much.

Mr. BGreg,
Thank you very much. "...under the covers...". I think you meant "under the hood", as in a car. I suppose "under the covers" would be man/woman interfacing, which I am familiar with!
Actually, I'm back in the US now for a few months. I looked at the OWC web site, but only cusorily so far. I'll contact them; they appear knowledgeable about Apple computers.
As to what you wrote about Western Digital's cases, I certainly wouldn't want a poor case. In China I had over time gotten 3 different external drive cases, 3 different Chinese brands, and separately bought Hitachi brand disk drives that 'simply' plugged into the cases. The drives are roughly 80GB 120GB and 320GB. The two larger ones are in cases that have Firewire plugs/jacks, which are bootable with my computer.
So my understanding, as you wrote, has been that my Powerbook will boot from an external hard drive, provided it connects via Firewire, and the disk drive itself is 'normally' formatted with however my computer's own disk drive is formatted, (HFS OS extended (journaled) or some such??). So I was left wondering why Western Digital would indicate that even though their such-and-so external hard drive case/drive was Firewire capable, that they would then say it would not be bootable with my Apple PPC computer......
Well, anyway, since you indicated Western Digital's case quality is suspect, then I'll try OWC and disregard Western Digital.
Naturally, OWC should be able to address this, but your thoughts are also welcome. You mentioned the OWC cases are good with Apples. Would the disk drives OWC supplied with the cases also be of relatively dependable quality?? From my so far only cursory look at their web site they appear to have various options, including case only options where I could insert my own or their own drives. These sorts of options seem preferable, also along with quality components.
My Powerbook has been in use since 2004. In China I put in a 1.25 memory 'chip' in the bottom and installed the 10.5.8 operating system, which I understand are the maximum workable with my Powerbook. When I inquired with Chinese friends if my 1.33 GHz processor could be taken out and a more powerful one put in, they said it wasn't feasible because in my particular computer my processor was, as I recall them saying, soldered/'permanently' connected with the 'motherboard', that it would just be easier to get a new computer.
I would be with them and they would nonchalantly open it completely up showing me all its tightly arranged 'innards' while at least giving it a good internal dust/dirt clean job for cheap lunch and a beer (& so much dirt/dust/lint there was!)...these are the same folks who build the things of course...fast moving hands with tiny screws flying everywhere, but everything 100% all back in place when finished.
My Chinese friends also said that nowadays Apples are not as well built as when my Powerbook was built, that nowadays an Apple's life expectancy was considerably lower, so I fear that when I get a new computer that, though it will be more up-to-date and powerful, etc., it most probably won't last near as long as my Powerbook has. They also said that in an older computer the fan was often the first component to go bad, and if a new one couldn't be easily found, as they said was my case, then you're just left with having to get an entirely new computer. Part of why I dislike electronic computer gadgets generally is that they are obsolete so quickly.
So, anyway, thanks very much for your information.

External time base changes with velocity

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