Count Events buffered with 6210

Hi all,
I just recently posted a question about timestamping:
http://forums.ni.com/ni/board/message?board.id=170&message.id=365874#M365874
After a lot of reading I realize that maybe I need to buy a new card as suggested here: http://forums.ni.com/ni/board/message?board.id=40&message.id=4734&query.id=11657#M4734
I was wondering what would be the fastest clock I can use for continoues event counting using the USB 6210 (or any other Bus Powered M Series devices).
Did anyone try to use this card for period measurements with 1 counter when the signal is random? I want to make sure this card can be used with an APD (which sometimes gives a high frequency burst of pulses) before I make a purchase.
Thanks,
Eyal

Hello Eyal,
The USB-6210 can count at up to 80 MHz, which is determined by the rate of the fastest internal base clock of the device. Information about National Instruments devices can easily be found through the product pages, the specifications tab gives general information about the device that can be useful in comparing between different devices, while the detailed specifications and the data sheet (links under the specifications tab) give more detailed information.
The USB-6210 product page details the Maximum Source Frequency at 80 MHz.
As for using only 1 counter on this device for period measurements, as long as the signal is low frequency this should be fine. But, if you are expecting the signal to vary in frequency, it may be a better idea to use 2 counters. For more information on period measurement with a counter check out Developer Zone Tutorial: Period Measurement with a Counter
Regards,
Dan King

Similar Messages

Synchronize hardware timed buffered counter acquisition with buffered analog input acquisition

LV7.1
DAQmx
PCI-6036E
SC-2345
Windows 2000
Greetings.
I am simply trying to synchronize AI readings with readings from one Counter.
I am trying to perform buffered analog input synchronized with buffered counter acquisition.
I'd like the AI acquistion to trigger the Counter acquistion.
I'm currently setting the Sample Clock Source for the CI Cnt Edges Task to "Dev1/ai/SampleClock" but when I try and set the source for the "DAQmx Trigger" I can't seem to select one that works. I assumed that the source should be the "Dev1/ai/StartTrigger" but that produces and error as does selecting any of the PFI's.
I'm new to DAQmx and didn't have any luck with the examples or what's been previously posted.
Thanks for your help.
Attachments:
Initialization.jpg ‏84 KB

Gentlemen-
All of your initial help was great. I had some noise on my counter lines so switched from an E-Series card to a PCI-6259 M-series card in order to use the counter digital filters.
Now I can't get a corellated buffered counter and buffered analog input acquistion to work. This same code worked fine on an E-series card but it doesn't on the M-series.
I verified that the source and gate of the counter are working properly using the test panel and a external function generator.
But when I run the attached code I get no data out of the "Counter 1D U32 NSamples", only an error saying that the timeout of the function was reached and no count data became available. Am I missing the specification of a another clock or something?
The counters also work fine using the M-series example code "Count Digital Events (M-Series DAQmx) but this is not a buffered acquisition.
Any help would be greatly appreciated.
Steve
Attachments:
Sample_Code.jpg ‏136 KB

How can I count events during a given time with 2 counters (6025 E)

Hi, How can I count events during a given time (1 sec for example) with 2 counters:
what is the best way?
how should i configurate both counter?
i have done the 1st counter in ev_counter with the gate being the output of the 2nd; and how can i say to the 2nd to trig the first after 1 sec counting? (trig at start and at end) what are the functoins calls in NIDAQ. i am using Visual C++

Greetings,
When you perform event counting a gate signal can be added such that if a low signal occurs on the gate, then the counter will pause. When a high signal is seen, the counter will continue counting edges. When you install the NI-DAQ driver you should have installed the examples for Visual C++. The counter examples are found in \Program Files\National Instruments\NI-DAQ\Examples\VisualC\Ctr. Take a look at STCeventCount.C. Be sure to only use STC examples with your hardware. The E-series boards contain the DAQ-STC chip.
Now, all you need is a gate signal with a width (high time) of 1 second. You could use an external frequency or pulse generator to do this. Or, you could just use the second counter found on your PCI-6025E board. In this
case you could configure the second counter to generate a single pulse. Take a look at the STCgenerateSinglePulse.C example. As long as the pulse is in a high state for one second you can use it to gate (or time) your counting of events.
Regards,
Justin Britten
Applications Engineer
National Instruments

Soucis d'utilisation des compteurs avec buffer - Count Single Buffered Events

Bonjour,
Voici mon soucis
Lorsque je scrute le conteur de ma carte ( 6033E ) j'arrive à lire les valeurs sans soucis
Par contre dès que j'utilise le buffer ( l'exemple Count Single Buffered Events-Adv (DAQ-STC) dans les exemples )
pas moyen d'afficher un comptage.
Avez vous une idée d'ou cela pourait provenir ?
Merci
Attachments:
Count Single Buffered Events-Adv (DAQ-STC).vi ‏193 KB

ok j'ai trouvé la solution,
pas facile quand on débute

How to count ONLY fields with a specific value

I modified the code below from the API reference to count combobox fields with a value of "MT" so I could total the number of a specific choice the form user input.
var count = 0;
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Here's the problem: I tried to use a similar script, modified only slightly from this form, in another total field to tally a different choice made with comboboxes and the script continues to tally the first choice. An example of one of the modified versions of the script is below.
var gcount = 0;
for (var i=0; i<this.numFields; i++)
var gname = this.getNthFieldName(i);
if ( this.getField(gname).type == "combobox" && this.getField(gname).value == "MT" ) gcount++;
this.getField("gPack").value = gcount.value;
I suspect I'm just missing something painfully obvious to seasoned scripters, but I can't seem to figure it out and I need this script to be able to count the number of 9 different options in the comboboxes.

OK, you can use a script like the following as the custom calculate script for the text fields that perform the counts:
// Custom calculate script for text field
(function () {
 // Declare and initialize variables
 var fn, s = "MT", count = 0;
 // Loop through the combo boxes
 for (var i = 1; i < 25; i++) {
 // Determine the current field name
 fn = "M" + util.printf("%02d", i));
 // See if the field value matches
 if (getField(fn).valueAsString === s) count++
 // Set this field value to the count
 event.value = count;
Change the value of the "s" variable to match the item that you want to count. The first and last lines prevent the unnecessary creatio of global variables, which is good. It also makes it easy to transfer to a more general document-level routine, which would be event better, something like:
// Custom calculate script for text field
function getCBCount(s) {
 var fn, count = 0;
 // Loop through the combo boxes
 for (var i = 1; i < 25; i++) {
 // Determine the current field name
 fn = "M" + util.printf("%02d", i));
 // See if the field value matches
 if (getField(fn).valueAsString === s) count++
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You would then call this function from the individual text boxes with the following custom calculate script:
getCBCount("MT");
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Hi,
I use an ActiveX component with Java and i've got a problem with events.
Java classes were generated with Bridge2Java (IBM).
In order to manage events I added a listener in my application :
javaMyActiveX = new MyActiveX();
javaMyActiveX.add_DMyActiveXEventsListener(new _DMyActiveXEventsAdapter());
I also added a constructor in the _DMyActiveXEventsAdapter class and I fill the body of methods.
The ActiveX generates two types of events :
- The ones are directly generated by methods.
- The others are generated by a thread.
With MS Products (VB, Visual C++, Visual J++), I catch all events.
With java (jdk 1.4), I catch only events generated by methods.
Can anyone help me.

I'm not 100% sure, but the last time I used that bridge, it only worked if you ran your Java app within a Microsoft VM.

Can I have multiple event structures with the same event cases?

Hello,
I'm doing an application that reproduces the front panel of the HP6675A power supply. To achieve this, I have done a state machine with different states
(initialize, measures, voltage, current, ocp, ov, store, recall, etc). In each state, should have an event structure that catches the events of the buttons, like for example: if the current state is the Voltage mode and the user press the current button the next state will be the Current mode. For this in each state of the state machine should be the same event structure with the same events.
My problem is that the Vi doesn't work properly when I have multiple event structures with the same event cases. There are some possibily to do this, and how? Or is impossible to have multiple events? I have been reading some posts, but I don't find solutions.
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Thank you very much.
Solved!
Go to Solution.

natasftw wrote:
Or as others mentioned, make two parallel loops. In one loop, have your state machine. In the other, have just the Event Handler. Pass the events from the handler to the state machine by way of queues.
A proper state machine will not need the second loop. The "Wait For Event" or "Idle" state (whatever you want to call it) is all you really need in order to catch the user button presses. The setup is almost there. Maybe add a shift register to keep track of which state to go to in the case of a timeout on the Event Structure.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines

Synchronizing two counter frequency inputs with multiple analog inputs

Hello all,
I'm fairly new to LabVIEW and I'm trying to collect data from multiple sources with synchronized timing on the acquisition but I'm having trouble figuring it out. My problem is that I've got two counter frequency inputs, one optical tachometer reading one pulse per revolution, and a max machinery flow meter with a k factor of 12000. I can't seem to figure out how to sync the timing with my multiple analog inputs. I've been attempting to get the tachometer to sync with the analog inputs first by following the example linked here. (https://decibel.ni.com/content/docs/DOC-10785) So far each time I run it I either get a timeout error on the DAQmx read or a "Multiple sample clock pulses were detected" error (see attached image). It seems if I slow the sampling rate way down to say 10 hz and ensure that the tachometer signal is over 800-1000 RPM (13-17 Hz) before starting the VI then the program will run without errors until the RPM drops below that threshold then the "Multiple sample clock pulses" error occurs. The code is attached below.
Does anyone know of a more effective way of syncing counter frequency inputs with analog inputs? I'd like to have a VI that can show 0 RPM (and eventually 0 flow as well, but I think I need to figure out the timing of one counter before I add another as it seems I can't have two counters in the same task). Any help on this would be greatly appreciated.
LabVIEW version 13.0
cDAQ-9178 Chassis with NI 9401 for the two counter inputs and NI 9205 for the analog inputs.
Thanks!
Richard
Solved!
Go to Solution.
Attachments:
SimpleDAQ.vi ‏44 KB
LV_Error.JPG ‏31 KB

Maybe third times the charm?
So I've finally got a good handle on why the VI is having problems at low RPM though I'm somewhat embarassed how long it took me to do that
Because I have the counter time synced to my Analog input task if it doesn't see at least two pulses between the two clock pulses set by the analog input task I get the -201314 "Multiple sample clock pulses" error. This seems fine at first as it just sets a minimum RPM that I can measure and it's well below the area I'm interested in so no problems there. I tried a simple error handler that would clear the error when it happend assuming the loop would keep iterating until the RPM went above that minimum at which point I would get a signal again. This is not the case, the read function just continues to spit out the -201314 error even after the RPM is back in the readable range. So then I tried adding two case structures so that when the error occured it would stop the task, clear the error, and then start the task again on the next loop iteration (Code Attached). This also doesn't work as the error shows up again on the stop task and then AGAIN on the start task on the next loop iteration. It seems this error is not actually being cleared and once it happens it stays with the task regardless of what the error cluster is carrying.
Anyone have any ideas? The only solution I can think of is to just clear all tasks and recreate them each loop iteration until the RPM is readable again but that strikes me as a horribly clunky solution.
Richard
Attachments:
SimpleDAQ_1_Start Stop.vi ‏48 KB

Help with Event Handlers with Scope

I have a question of how I must implement the event handlers with scope, I have problems in the execution of processes BPEL (they are generating exceptions in the dehydration)
I have two models for event handlers and I need to know which is the best way to implement event handlers.
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Thanks!
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2) Event Handler with PartnerLink invocation INSIDE scope
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<onMessage partnerLink="PartnerLink1"/>
<onAlarm/>
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<sequence name="Sequence_1">
<invoke name="Invoke_1" partnerLink="PartnerLink1"/>
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</scope>

Thanks -- indeed a crucial call might be missing. I was doing
this until 3 yesterday morning.
Would this be the correct sample code to use? :
http://livedocs.macromedia.com/flash/mx2004/main_7_2/wwhelp/wwhimpl/common/html/wwhelp.htm ?context=Flash_MX_2004&file=00000846.html
It seems to work (although someone cautions in the page
comments that it doesn't).
Part of my trouble in working with AS 2.0 is that I feel I
shouldn't have to do such complicated things (Delegate classes,
etc) in order to get simple things done (loading XML files). This
is not a complaint per se -- rather I feel that I must be missing
something, that it is my inexperience that is causing me to bend
through so many hoops: programming "should" be elegant and simple.
So, any links helpful. Thanks.

Business Event Imparts with Skills (GAP UPDATE)

Dear Experts,
If the Business Event Imparts with Skill; does skill gets automatically updated once course attended by an employee?
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Best Regards,
Aslam
--- Dear Experts it's important for us to implement this in few days; please pass me the steps to achieve this... thanks a lot.
Message was edited by:
Aslam Riaz

Dear Professionals,
I did the following;
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Event creation with status management

Hello esteemed gurus ... it's your friendly workflow noob again
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Hi Neil,
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Thanks,
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Need to monitor event ID with Event Level :Critical , Also how to generate (powershell or otherwise) an event with Event Level :Critical

Need to monitor event ID with Event Level :Critical , Also how to generate (powershell or otherwise) an event with Event Level :Critical

Hi
First, we Need to clarify what do you want.
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Cheers,
Stefan
Blog: http://blog.scomfaq.ch

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Iphoto events showing with key photo of a palm tree in gray?

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Integration of event module with paypal o credit card gateway

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Issue is resolved, both ways with PI without PI can be implemented.
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Count Events buffered with 6210

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