Measure a frequency out of the trigger counter sample vi

Hello,
I want to measure the frequency of the simulated signal. I already succeeded in counting the pulse when rising. I probably need to integrate a wait until moduleso it will count the rising signal per time unit. I tried this but it didnt work out. Can you help me so that the VI will display the frequency with the wait until module.
Kind regards,
Michiel Huijgen (the Hague university, Holland)
Attachments:
Trigger Counter vb.vi ‏241 KB

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How do I simultaneously measure two frequencies using the two counters on a CompactDAQ chassis?

I am using two encoders as speed wheels to compare two different speeds simultaneously. I have the encoders connected to the two counter inputs of my CompactDAQ chassis using NI 9423 cards in order to measure the frequencies produced be each and then I convert that data into speed. How do I efficiently measure these frequencies simultaneously? I say efficiently because the only way I can get it to work right now is to create a task for the first encoder, gather my frequency data, clear the task for that encoder and then move onto the next. This is a slow process and therefore the measurements are not exactly simultaneous. If I try to measure them simultaneously I get resource errors.

Hey Kevin,
Thank you for the information. The cDAQ-9172 has two counters on the chassis itself. There are no counters on the actual module. What this means is when you access Counter 0 using a module in slot5 (for example), you are actually accessing Counter 0 on the backplane of the chassis. This is why you are getting the resource is reserved error. If you have the other input frequency connected to the second counter of the chassis, you just need to access it using Counter 1 instead of Counter 0.
In your code, for the Counter 2 input, you have "cDAQ1Mod6/ctr0". If you just change that to "cDAQ1Mod6/ctr1", this will get rid of your "resource is reserved error. Also, to get both your tasks to be a little more closely synchronized, you should probably use a sequence structure to be sure that they start together. In the code below, I have used two seperate counters on two different modules and synchronized them. If you are using the same module you would just need to change the counter inputs to represent the two different counters on the same module.
Hope that helps.
Regards,
Message Edited by Raajit L on 04-02-2007 11:00 AM
Raajit L
National Instruments
Attachments:
Counter Parallel Tasks.jpg ‏66 KB

Using AI Sample Clock to Trigger Counter Samples

My basic question is: Is the ai\SampleClock signal only active while an analog input task is running?
The details are:
I have an X-series PCIe-6321 multifunction DAQ card. It is controlling a SCXI chassis and has a SCXI-1180 and SCXI-1302 so I can control analog inputs of the chassis as well as access the 4 counter on the card. My application requires that I use all 4 counters to measure a frequency input signal and synchronize the samples to the analog input signals. I have created 5 tasks, 1 for the AI and 1 for each counter.
I am using LabVIEW 8.6.1 with the latest NI-DAQ drivers on and 64-bit Vista OS
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2. Can I use the ai\SampleClock as in input sample clock for each of the frequency tasks? If I do this will the sampling start be syncronized? I.e. if I start each of the frequency tasks first, will they wait until the AI task is started before they start sampling?
3. If that doesn't work, do I need to route the sample clock from the AI task to a PFI line (PFI1) and then use that as input to the frequency task sample clock?
I usually do option 3 when synchronizing two cards in PXI chassis and only use the software task start in stead of of synchronizing on a digital start, since the sample clock will control the samples anyway. I need to know if the same behaviour works with the scenario above.
Thanks,
Bob
Prolucid Technolgies Inc.
Solved!
Go to Solution.

Hi Bob,
I can confirm that the ai/SampleClock will only be active while the AI task is running. As far as the other questions go:
1. You'd have to provide more information about what you looking to do exactly, but there is no problem with routing the sample clock of the Analog Input task to be used with the Counters. I would read through the section of the X Series User Manual that discusses sample-clocked frequency measurements (starting on page 7-16) for some more information about what is actually going on during this configuration to make sure it suits your requirements.
The frequency of the signal to be measured should be at least twice as fast as the sample clock of your AI task.
2. You can indeed route the signal to all four tasks at the same time (you can refer to the Device Routes page in MAX to double-check routing restrictions). The sampling will be synchronized provided the four counters are started before the AI task, but the counters will be armed at different times unless you configure an Arm Start Trigger (see page 7-45 of the X Series User Manual). I would consider using the ai/StartTrigger if you wish to do this.
The effect of not arming the counters at the same time would be a different number of periods to average on each counter for the very first sample (assuming averaging is enabled). This might not be a big concern but I just wanted to point it out.
3. The routes are available internal to the board so external routing isn't necessary, you can just specify to use the AI Sample clock for the clock of each counter and the routes will be made for you. If you prefer to export the signal on a PFI line and route it back in on a different PFI line this option is also available to you but shouldn't be necessary.
I hope this helps you get started. I'd make sure to take a look at chapter 7 of the X Series User Manual if you get a chance since it describes how all of the counter configurations work in more detail. If you have any related questions don't hesitate to post back.
Best Regards,
John
Message Edited by John P on 12-01-2009 07:52 PM
John Passiak

Measure scan frequency using 2 e-series boards and an external clock.

I am setting up a data acquisition system in which the user has the ability to select between multiple sources for the scan frequency. The user can choose either hardware based and select the scan frequency or an external source, in this case, an encoder. When the user selects the external case, I would like to measure the scan frequency. I have a PXI chassis with 3 6071E DAQ boards. I have the encoder pulse train wired into the master board and would like to use one of the slave boards to count the pulses and measure the frequency. I based the code I developed on example code that shipped with LabView. However, when I drive the master board with a known frequency using its internal clock,
I measure 0 frequency on using the slave boards counter.
Attachments:
DAQ_3_Boards_-_State_Machine_-_Scaled_Array.llb ‏1525 KB

It sounds like you have your program setup to measure the frequency of the clock only when you are using an external source. The counter won't get an input if you are not using an external source, right? So, when you drive the master board with an internal clock, the counter will have nothing to count.

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How do you measure frequency using the onboard counter on PCMCIA 6024-E

I am using LABView 6.1 and NI-DAQ 7.2 with a SCXI-1000 chassis and a PCMCIA 6024-E on a laptop. I need to measure a frequency of about 3KHz and would like to do that using an 1180 direct through connector.
Firstly, should I see this 1180 in MAX like any other module?
And secondly, how do I use this 6024-E card to measure frequency? Which pins are supposed to be used on it to measure, and will I see the counter run in the test window in MAX according to the frequency measured?
I know NI also have a frequency module for the SCXI chassis. So lastly, will it be better to use that, rather than measure directly off the 6024-E?
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Hello,
I think I can help out with some of your questions. First, the 1180 module won�t show up in MAX since it is really just a feedthrough cable which allows you access to your unused signals from the DAQ card.
You definitely can measure frequency using your 6024E. An example installs with NI-DAQ 7.2 which shows how to accomplish this. To access this example go to the LabVIEW start up screen and hit the Find Example button. When the Example Finder opens up browse to the following location: Hardware Input and Output -> DAQ -> Counters -> DAQ-STC -> Measure Frequency (DAQ-STC).vi
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Using the 6525 counter to measure frequency: is there a neater way?

I'm currently using the high speed counter on the a USB 6525 module to measure the frequency of a spinning object via a hall effect sensor.
I was wondering if there was a simpler/ more effective way of coding it than this?
Currently all I do is take the current counter reading, wait a second, take another reading and subtract one from the other. The result is the frequency, in hertz.
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Thanks
Solved!
Go to Solution.
Attachments:
6525 frequency count LV8.vi ‏25 KB
6525 frequency count LV2013.vi ‏15 KB

Thanks for commenting. I'm not sure if I'm doing it right though or whether the NI USB 6525 can't handle this type of measurement?
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Attachments:
6525 frequency count LV9.vi ‏36 KB

How do I use the buffered counting mode at a fixed frequency?

Hi-
   I'm using a PCI-6259 M-series board with the Nidaq MX
drivers in Labview 7. I am trying to use one counter to do
buffered edge counting (eg. count how many pulses appear on one input
in 400 successive time bins of 10 uS each following a digital start
pulse). That is, my inputs are:
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     Count Pulse (from a photomultiplier tube in the experiment)
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Pulse (or, equally good, # of pulses from 0 to 20 uS....I can
subtract later)
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   The Count Digital Events-Buffered-Finite-Ext Clk.vi sample
appears to do half of this. I can set this up CTR0 with the Count
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a Start Trigger, right?). However, I need to generate a Sample
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resource is reserved if I do both at the same time. But, I can't
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are different. Is there some reason I can't use both counters at
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I think I can use the FREQOUT pin on the card to generate a Sample
Clock Source at 100 kHz, since I think this is independent of CTR0
& CTR1. However, I can't trigger the FREQOUT to always start
when I get a Start Pulse (as I can if I trigger a Digital Pulse Train
to start on a digital trigger...or can I?)...so my bins will move
randomly by up to 10 uS.
   This is an unrelated topic, but is there a discussion of
the relationship between the terminology in the manuals describing the
cards (SOURCE, GATE, OUTPUT terminals) and the terminology in NidaqMX
(Source Clock/SrcClk.Source, CI.CountEdges.Term, CO.Pulse.Term)?
Eg. is CTR0.GATE always the same thing as SrcClk.Source, or does it
depend on the mode of operation? If the M-series hardware manual
says to connect something to the SOURCE input, how do I assign an
alternate PFI pin to that SOURCE input in Labview? Does it depend
on the counter type, or is it always the same?

Dave,
Hi, you brought up several questions / issues -- let me see if I can help with some of them:
   I can set this up CTR0 with the Count pulse (and possibly add the start pulse as an Arm Start....I can't use a Start Trigger, right?).
Yes, you could set up this way. Also, as far as I know you're also correct that you need to configure for an "Arm Start" trigger using the DAQmx Trigger property node. The "Arm Start" trigger is used for counter input (measurement) apps while the regular "Start Trigger" can be used for counter output (pulse generation) tasks. I don't think I've experimented with recent versions of DAQmx though so it may have changed in 7.4 or 7.5
...I tried to set up CTR1 along the lines of Gen Dig Pulse Train-Finite-Dig Start.vi for generating a finite pulse train starting on a digital trigger, and connecting the output from CTR1 to the Sample Clock Source on CTR0. However, I get an error -50103 saying the specified resource is reserved if I do both at the same time
I highlighted the problem -- the FINITE pulse train. DAQmx uses CTR0 as a "helper" when you generate a finite pulse train on CTR1. It would generate a single pulse whose width corresponds to the exact amount of time needed for CTR1 to generate its specified # of pulses.
For your specific app, I think you could generate a triggered continuous pulse train with CTR1 -- this wouldn't need to use CTR0 as a helper.  The Start Pulse would arm CTR0 at the same instant that CTR1 is started.   If you set up CTR0 to acquire on the trailing edge of CTR1's pulses, then you'll get the time bins you want.
A final slight mod would be to setup CTR0 for measuring buffered periods (set units == "Ticks") instead of counting edges. In that mode, you wouldn't have to do the subtraction at the end.
   This is an unrelated topic, but is there a discussion of the relationship between the terminology in the manuals describing the cards (SOURCE, GATE, OUTPUT terminals) and the terminology in NidaqMX (Source Clock/SrcClk.Source, CI.CountEdges.Term, CO.Pulse.Term)? Eg. is CTR0.GATE always the same thing as SrcClk.Source, or does it depend on the mode of operation?
There's an NI app note and some discussion forum hits if you search the site for "daqmx terminology."
If the M-series hardware manual says to connect something to the SOURCE input, how do I assign an alternate PFI pin to that SOURCE input in Labview? Does it depend on the counter type, or is it always the same?
Usually, that choice would be available under the DAQmx Channel property node.   There'll be some place to define where the input signal is coming from, generally with "Term" or "Terminal" as part of its name.   Sorry I can't be more specific as I'm not at my LV computer now.
Happy counting!
-Kevin P.

What's the maximum counter frequency for the cRIO?

Hi Everyone,
First of all, thanks for your input here!
I'm new to the cRIO, but have been working with LabVIEW for awhile. I need to accurately measure the time between several digital inputs. One input starts the counter, another captures and stores the current counter value, and a third stops the timer and also captures and stores the counter value. It's basically a stopwatch. The problem is that the counter needs to run at a frequency of 100Mhz or greater. It also needs to be at least 28 bits wide so that it won't overflow between start and stop inputs. Is this possible with any of the cRIO systems currently available? If so, how? I'm assuming it will need to be implemented within the FPGA, but does the FPGA run that fast?
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Solved!
Go to Solution.

Hi Yohan,
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I hope this helps!
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Measure a frequency out of the trigger counter sample vi

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