Can I use a substitute for the Sample Clock?

I have three different analog inputs coming from one device (PCI-6221). Two inputs are running at the same sample rate while the third needs a faster sample rate and a trigger. I have these seperated as two seperate tasks but my problem is they both use the sample clock. Can I use a substitute for the sample clock on the third channel?
I am running LabVIEW 8.2 on Windows XP.
Thanks in advance for your help.
Ron Deavers, CLD

Hi programmindragon,
I understand you are trying to
configure your PCI-6221 to sample on multiple channels, while having
different rates and triggers for the channels. Unfortunately, you can
only configure one analog input task to run at once and all the channels in
the task must share the same configurations, including the sample clock
and trigger. This is due to the fact that all the channels are
multiplexed to a single amplifier and ADC on the device. Thus, you will
not be able to configure the two inputs at one rate and use a different
clock rate and trigger for the third input. Is it possible to sample at the
maximum rate on all channels and decimate the data that you don't need on the certain
channels, as well as share the same type of triggering? Hopefully you will be able to run your application with the same configuration across multiple channels, otherwise you may need multiple DAQ devices. Please let me know if you have any further questions related to this issue.
Regards,
Daniel S.
National Instruments

Similar Messages

HT1657 Help my daughter accidently downloaded the french version of Beverley Hills Chihuahua3 and whule i was trying to stop it we ended up withsomeother strange movie downloading. I have paused them. Can i cancel and substitute for the English. She is ha

Help my daughter accidently downloaded the french version of Beverley Hills Chihuahua3 and whule i was trying to stop it we ended up with some other strange movie downloading. I have paused them. Can i cancel and substitute for the English. She is having a meltdown.

Do you have a backup that you can restore from? Your old hard drive seems to be the problem.

Buffered event counting. Why can't I explicitly sequence generating the Sample Clock Pulse and reading the counters?

At irregular occasions I need to grab counts from several counters, and buffering the counts must be done simultaneously for all counters. I'm modeling my approach after zone.ni.com/devzone/cda/tut/p/id/5404 which someone kindly pointed out in an earlier thread. However, that example only uses one counter, and you can't test the synchronization with only one counter, so I am using two counters configured the same way, and they're wired to a single benchtop signal generator (for example at 300 kHz).
What I want to do, I can test in a loop with a somewhat random wait in it. I want to drive a hardware digital output line high for a few ms and then low again. The hardware line is physically connected to terminals for my timing vi's Sample Clock Source and so will cause them to buffer their counts for later reading. After I pulse this line, when I know new good buffered counts await me, I want to read both my counters. If their bufferings are simultaneous, then each counter will have counted the same number of additional counts since the last loop iteration, which I can check by subtracting the last value sitting in a shift register and then subtracting the two "additional counts" values and displaying this difference as "Diff". It should always be 0, or occasionally +1 followed immediately by -1, or else the reverse, because buffering and a count could happen practically at the same moment.
When I do this using a flat sequence to control the relative timing of these steps, so the read happens after the pulse, the counters often time out and everything dies. The lengths of time before, during, and after the pulse, and the timeout value for the read vi, and the size of the buffer and various other things, don't seem to change this, even if I make things so long I could do the counting myself holding a clipboard as my buffer. I've attached AfterPulse.vi to illustrate this. If I get 3 or 10 or so iterations before it dies, I observe Diff = 0; at least that much is good.
When I use two flat sequences running in parallel inside my test loop, one to control the pulse timing, and the other to read the counters and do things with their results, it seems to work. In fact, Diff is always 0 or very occasionally the +/- 1 sequence. But in this case there is nothing controlling the relative timing such that the counters only get read after the pulse fires, though the results seem to show that this is true. I think the reads should be indeterminate with respect to the pulses, which would be unreliable. I don't know why it's working and can't expect it to work in other environments, can I? Moreover, if I set some of the pulse timing numbers to 1 or 2 or 5 ms, timeouts start happening again, too. So I think I have a workaround that I don't understand, shouldn't work, and shouldn't be trusted. See SeparateSequence.vi for this one.
I also tried other versions of the well-defined, single sequence vi, moving the counter reads to different sequence frames so that they occur with the Sample Clock Source's rising edge, or while it is high, or with the falling edge, and they also often time out. I'll post these if anyone likes but can't post now due to the attachment limit.
Here's an odd, unexpected observation: I have to sequence the reads of the counters to occur before I use the results I read, or else many of the cycles of this combine a new count from one counter with the one-back count from the other counter, and Diff takes on values like the number of counts in a loop. I though the dataflow principle would dictate that current values would get used, but apparently not so. Sequencing the calculations to happen after the reads fixes this. Any idea why?
So, why am I not succeeding in taking proper control of the sequence of these events?
Thanks!!!
Attachments:
AfterPulse.vi ‏51 KB
InSeparateSequence.vi ‏49 KB

Kevin, thanks for all the work.
>Have you run with the little execution highlighting lightbulb on? -Yes. In versions of this where there is no enforced timing between the counter and the digital line, and there's a delay inserted before the digital line, it works. There are nearly simultaneous starts on two tracks. Execution proceeds directly along the task wire to the counter. Meanwhile, the execution along the task wire to the digital high gets delayed. Then, when the digital high fires, the counter completes its task, and execution proceeds downstream from the counter. Note, I do have to set the timeout on the counter longer, because the vi runs so slowly when it's painting its progress along the wires. If there is any timing relationship enforced between the counter and the digital transition, it doesn't work. It appears to me that to read a counter, you have to ask it for a result, then drive the line high, and then receive the result, and execution inside the counter has to be ongoing during the rising line edge.
>from what I remember, there isn't much to it. There really aren't many candidate places for trouble. A pulse is generated with DIO, then a single sample is read from each counter. -Yup, you got it. This should be trivial.
>A timeout means either that the pulse isn't generated or that the counter tasks don't receive it. - Or it could mean that the counter task must be in the middle of executing when the rising edge of the pulse arrives. Certainly the highlighted execution indicates that. Making a broken vi run by cutting the error wires that sequence the counter read relative to the pulse also seems to support that.
>Have you verified that the digital pulse happens using a scope? -Verified in some versions by running another loop watching a digital input, and lighting an indicator, or recording how many times the line goes high, etc. Also, in your vi, with highlighting, if I delete the error wire from the last digital output to the first counter to allow parallel execution, I see the counter execution start before the rising edge, and complete when the line high vi executes. Also, if I use separate loops to drive the line high and to read the counter, it works (see TwoLoops.vi or see the screenshot of the block diagram attached below so you don't need a LV box). I could go sign out a scope, but think it's obvious the line is pulsing given that all these things work.
>Wait! I think that's it! If I recall correctly, you're generating the digital pulse on port0/line0... On a 6259, the lines of port 0 are only for correlated DIO and do not map to PFI. -But I'm not using internal connections, I actually physically wired P0L1 (pin 66) to PFI0 (pin 73). It was port0/line1, by the way. And when running some of these vi's, I also physically jumper this connection to port0/line2 as an analog input to watch it. And, again, the pulse does cause the counter to operate, so it clearly connects - it just doesn't operate the way I think it is described operating.
For what it's worth, there's another mystery. Some of the docs seem to say that the pulse has to be applied to the counter gate terminal, rather than to the line associated with the sample clock source on the timing vi. I have tried combinations of counter gate and or sample clock source and concluded it seems like the sample clock source is the terminal that matters, and it's what I'm using lately, but for example the document I cited, "Buffered Event Counting", from last September, says "It uses both the source and gate of a counter for its operation. The active edges on the gate of a counter is used to latch the current count register value in a hardware register which is then transferred via Direct Memory Access...". I may go a round of trying those combinations with the latest vi's we've discussed.
Attachments:
NestedSequences.png ‏26 KB

I can't use my fingerprint for the App Store?

I tried re setting it again but couldn't.
I also read that i have to change the "Restrictions" to 15 minutes for the password, but i don't have that option available.
What can I do?

It isn't clear from your question whether you weren't able to enable Touch ID for the store or if it is not recognizing your fingerprint when you use it. The following link has a section related to Touch ID for the store that may help: http://support.apple.com/kb/HT5883

Can i use partition by for the following

hi, i wanted to find out if i can use partition by or rank to the get the needed results below. If yes can anyone help me out with it.
if there is an other way to get the results also please let me know.
i'm using Oracle version 10.2.0.4.0
create table script:
CREATE TABLE DMM.QUES
CASENAME        VARCHAR2(100 BYTE),
CASENUMBER      VARCHAR2(20 BYTE),
COVERAGE        VARCHAR2(10 BYTE),
DIVISIONNUMBER VARCHAR2(6 BYTE),
CLASSNUMBER     number,
TIER            VARCHAR2(2 BYTE),
MONTHLYRATE     NUMBER
)Insert statement scripts:
insert into QUES (CASENAME,CASENUMBER, COVERAGE, DIVISIONNUMBER, CLASSNUMBER, TIER,MONTHLYRATE)
values ('ABC','123J','health', '456J','987',null,.25)
insert into QUES (CASENAME,CASENUMBER, COVERAGE, DIVISIONNUMBER, CLASSNUMBER, TIER,MONTHLYRATE)
values ('ABC','123J','health', '456J','123',null,.25)
insert into QUES (CASENAME,CASENUMBER, COVERAGE, DIVISIONNUMBER, CLASSNUMBER, TIER,MONTHLYRATE)
values ('ABC','123J','health', '456J','453',null,.25)
insert into QUES (CASENAME,CASENUMBER, COVERAGE, DIVISIONNUMBER, CLASSNUMBER, TIER,MONTHLYRATE)
values ('ABC','123J','dental', '456J','453','ee',.29)
insert into QUES (CASENAME,CASENUMBER, COVERAGE, DIVISIONNUMBER, CLASSNUMBER, TIER,MONTHLYRATE)
values ('ABC','123J','dental', '456J','453','es',.23)
insert into QUES (CASENAME,CASENUMBER, COVERAGE, DIVISIONNUMBER, CLASSNUMBER, TIER,MONTHLYRATE)
values ('ABC','123J','dental', '456J','453','ec',.44)
insert into QUES (CASENAME,CASENUMBER, COVERAGE, DIVISIONNUMBER, CLASSNUMBER, TIER,MONTHLYRATE)
values ('ABC','123J','dental', '456J','453','fa',.33)
insert into QUES (CASENAME,CASENUMBER, COVERAGE, DIVISIONNUMBER, CLASSNUMBER, TIER,MONTHLYRATE)
values ('ABC','123J','dental', '456J','123','ee',.45)
insert into QUES (CASENAME,CASENUMBER, COVERAGE, DIVISIONNUMBER, CLASSNUMBER, TIER,MONTHLYRATE)
values ('ABC','123J','dental', '456J','123','es',.45)
insert into QUES (CASENAME,CASENUMBER, COVERAGE, DIVISIONNUMBER, CLASSNUMBER, TIER,MONTHLYRATE)
values ('ABC','123J','dental', '456J','123','ec',.46)
insert into QUES (CASENAME,CASENUMBER, COVERAGE, DIVISIONNUMBER, CLASSNUMBER, TIER,MONTHLYRATE)
values ('ABC','123J','dental', '456J','123','fa',.49)select * from ques:
ABC     123J     health     456J     987          0.25
ABC     123J     health     456J     453          0.25
ABC     123J     health     456J     123          0.25
ABC     123J     dental     456J     453     ee     0.29
ABC     123J     dental     456J     453     es     0.23
ABC     123J     dental     456J     453     ec     0.44
ABC     123J     dental     456J     453     fa     0.33
ABC     123J     dental     456J     123     ee     0.45
ABC     123J     dental     456J     123     es     0.45
ABC     123J     dental     456J     123     ec     0.46
ABC     123J     dental     456J     123     fa     0.49i would like to get the following output
ABC     123J     health     456J     123          0.25
ABC     123J     dental     456J     123     ee     0.45
ABC     123J     dental     456J     123     es     0.45
ABC     123J     dental     456J     123     ec     0.46
ABC     123J     dental     456J     123     fa     0.49i would like the code to take the minimum of classnumber for each divisonnumber/coverage combination and give me all the records for that classnumber.
Thanks in advance.

Hi,
That's an example of a Top-N Query , and yes, analytic functions are a good way to do it:
WITH     got_r_num     AS
     SELECT     ques.*
     ,     RANK () OVER ( PARTITION BY coverage
                           ,          divisionnumber
                      ORDER BY          classnumber
                    ) AS r_num
     FROM    ques
SELECT casename, casenumber, coverage, divisionnumber, classnumber, tier, monthlyrate
FROM     got_r_num
WHERE     r_num     = 1
;Thanks for posting the CREATE TABLE and INSERT statements, that's very helpful!
"PARTITION BY" is a clause often used with analytic functions. "PARTTIION" also means at least two other things in Oracle, so people will understand you better if you say "analytic functions", rather than "partition by".
For more about the RANK function, see this thread:
Re: A "double grouping" SQL query

I want to install windows7 on my 27in iMAC. I have an OEM version of Win7 which is win pro 7, 64 bit english. I will use boot camp to partion the hard drive for a win7 install. Can I use this version for the installation ??

My iMAC is a 2011 3.4 GHz intel i7 based with a 27in display. A year ago, I bought a Microsoft win pro 7 64-bit english OEM OS to install over a newly assembled AMD PC. I never installed it. Now, I want to put it on my iMAC using either Apple Bootcamp or Parallels. The win 7 OEM package has a lot of verbage about using an OEM preinstallation kit (OPK) and that it must be preinstalled on the hard drive. Is it OK to install this win7 version following the Bootcamp instructions.?
K6JPJ

Please post in the Boot Camp (not Bootcamp) forum I'm sure someone there can answer your quesiton if no one here is able to.

Can I use different colours for the different user accounts in my iCal?

I have my own iCal and one for my boss. I need our appointments to show up in different colours so that I can tell at a glance which are mine and which are his. Currently our appointments show up on the same calendar, on top of each other, and both are coloured red.
Can I change the colour of one of us?

Thanks. If there are other people invited to the appointment it comes up with this
So I don't want to 'move' it or cancel the original appointment. is there another way I can, for example, have my boss's appointments all come up green and mine all come up blue......

Variable selection issue can we use variable exit for the below problem

Hi experts,
i have query in which i have an infoobject which is a characterstic i have even set the sort property for that infoobject but when the variable screen comes up and when we go into the selection screen all the help values are not sorted in the way i have set them. for example
ihave project managers like below
A
B
C
D
E
F
G
H
instead of displaying in order above its displyaing in
H
A
G
C
B
D
F
How to set it right.
thanks and regards
Message was edited by:
Neel Kamal

Hi
actually i have done the same thing its getting displayed in the bex analyzer but not in the protal.
thanks and regards
Message was edited by:
Neel Kamal

I can't use my AppleID for the update of my apps.

I'm stuck with a friend's ID. I can't even update apps that I've purchased with mine.

If you need to sign into your device with your Apple ID go to
iOS 5.1.1: Settings > Store > Select your friends Apple ID and Sign Out, then sign in with yours.
iOS 6: Settings > iTunes and App Stores > Apple ID > Sign Out
To eliminate this issue, you should delete any apps off your phone that were not purchased with your Apple ID. Although it's possible to have apps from two different Apple ID's on one device, it's complicated and can get confusing.

HT204053 Dear Support Team, every time i tried to logon Icloud its gives me wrong user name or password and at the end it show me error " This Apple ID is valid but is not an ICloud Account" then how can i use one account for same Apple ID and ICloud???

Dear Support Team,
Every time i tried to logon Icloud its gives me wrong user name or password and at the end it show me error " This Apple ID is valid but is not an ICloud Account" then how can i use one account for same Apple ID and ICloud?
Thanks

It is not possible to create a new iCloud account using a Windows machine. You must create the account using a Mac (10.7.5 or more) or an IOS device (iPhone etc). Once that is done you can sign into and use the account on your Windows machine.

I have two iphone one is iphone 5 and othere is iphone 4 . can i use same id for both ? And do i have to purchase the application again for iphone 4 which i have buyed for iphone 5.??

i have two iphone one is iphone 5 and othere is iphone 4 . can i use same id for both ? And do i have to purchase the application again for iphone 4 which i have buyed for iphone 5.??

You can use the same Apple ID for both phones, you would then be able to use the purchased Apps/Content on both phones without having to pay again.

Can you use one PC for 2 different Ipods, with out erasing the others music from Itunes?

Can you use one PC for different Ipod touch's , with out erasing the other persons Itunes music?

Yes. See:
How to use multiple iPods, iPads, or iPhones with one computer

I cracked my screen. I want to use other monitor which I had one. I bought Apple Mini-DP to VGA adapter. It worked. It means I can see ADDITIONAL screen. However I want to use this monitor for the main screen. How can I do?? Please help.

I cracked my screen. I want to use other monitor which I had one. I bought an Apple Mini-DP to VGA adapter. It worked. It means I can see ADDITIONAL screen. However I want to use this monitor for the main screen. How can I do?? Please help.

You have the display set in Extended Desktop mode. The Menu Bar and Dock will be on the MacBook display and your background screen on the monitor. In System Preferences>Display on the MacBook screen there should be an Arrangement tab when you have the MacBook hooked up to the monitor and both screens working. When you click the Arrangement tab do you see two monitors side by side? One of them will have a Menu Bar at the top. Just click on the Menu Bar and drag it to the second monitor. That will make the second monitor your main screen. You can now use your MacBook in Clamshell Mode with a wired or Bluetooth keyboard and mouse. http://support.apple.com/kb/HT3131 When you disconnect from the monitor your Menu Bar will automatically change back to the MacBook.

When I use my IPhone 4S to view the Shaw Go Movie Central App when I am at home I only use WiFi which is automatic, I start watching a show and sometimes I will get a message like "you can not use your cellular for video playback" or something close to th

When I use my IPhone 4S to view the Shaw Go Movie Central App when I am at home I only use WiFi which is automatic, I start watching a show and sometimes I will get a message like "you can not use your cellular for video playback" or something close to that. Then I received an email from Telus saying I had used my 3G instead of Wi-Fi using 75% of my data. How can this happen when I'm on Wi-Fi at home? If it switched to 3G for some reason I should have been disconnected and not just transferred to 3G network using up my data. What is the fix for this??

It doesn't have to be that complicated, Verizon iPhones come unlocked, just tell VZ you're going on Holiday/Traveling and suspend the service, no need to pay for service if you're not going to be using it. Pick up local SIM cards in the countries of your choosing, pop them in, re-activate iMessage and you're set!
I recommend getting a SIM card from the Three network in England, they have great EU roaming rates and free like-home roaming in Italy.
Set your phone's region to match the country you're in, it'll save from some headaches when calling local/international numbers.
To answer your questions,
1. If you choose not to have a local SIM card, it is good to keep your phone in Airplane mode to save battery.
2. Make sure the two iPhones have different names to reduce sync/restore issues.
3. If husband has an iPhone also, you can chat with iMessage/Facetime, just give him heads up about the new number you'll have. Otherwise, use Whatsapp if he's got an Android. You can activate Whatsapp with your American number or the international number if you choose to get a SIM in Europe.
Also, Get the MagicJack app and/or Google Hangouts, both of those apps provide you with free calling to the USA and Canada using any internet connection. Google Voice is another good way to SMS across the seas.
Let me know if you need any more tips for iPhoning across the pond.

In a future version of ibook author would be very useful to provide for the creation of shared content online. Teachers can collaborate on the creation of a text. Very useful for teachers to collaborate in the network. sharing sharing sharing

in a future version of ibook author would be very useful to provide for the creation of shared content online.
Teachers can collaborate on the creation of a text. Very useful for teachers to collaborate in the network. sharing sharing sharing

As always, feel free to use the 'Provide iBooks Author Feedback' menu item for features you'd like added in the future, etc.
http://www.apple.com/feedback/ibooks-author.html

Can I use a substitute for the Sample Clock?

Similar Messages

Maybe you are looking for