NIScope 2.7: SW Trig and PXI5112

Dear experts,
I want to generate a simultaneous trigger on four PXI5112 to determine the timestamp counter offsets. My application looks quite similar to the Synchronisation example except that I want to trigger the master card by software. So I configured the master to trigger by software.
This piece used to run on earlier NIScope versions. Now I've changed to 2.7 and I'm encountering an error on the SW Trig VI "Function or method not supported". I discovered that this VI now has an additional input parameter (called "which trigger") where earlier versions didn't have.
So this VI doesn't seem to be downward compatible to earlier versions.
1) What happened to this VI ?
2) Waht does this parameter mean?
3) How can I resolve this error?
Thanks for your help
Oliver Friedrich

The original VI is called "niScope Send Software Trigger.vi." This VI still exists, and can be found under \instr.lib\niScope\niScopeObsolete.llb.
However, the simpler solution is to use the new VI (niScope Send Software Trigger Edge.vi). You need to wire a constant to the "which trigger" terminal. Right-click on that terminal and select Create>>Constant. Then choose the constant value as "ReferenceTrigger". Then this VI will work for the PXI-5112.
The newer VI supports several different types of triggers. While only the ReferenceTrigger can be used on the 5112, the default for that VI is StartTrigger. You are getting this error because you are not wiring a value to this terminal (so StartTrigger is used by default, which is not supported on the 5112).
Hope this helps,
Patrick

Similar Messages

Help about analog trig and external clock scan

Hi, there. I want to measure the engine cylinder pressure with an PXI6070-E card and BEI encoder. I have tried using Cont Acq&Graph ExtScanClk D-Trig.vi and Cont Acq&Graph ExtScanClk Soft A-Trig.vi , but they don't work. What I did was to connect a 50HZ pulse to PFI0 (analog triggering, I changed the code from digital triggering to analog triggering), and a 100K pulse to PFI7 (startscan), and an 50 HZ analog signal to ACH0. But the code always says: timeout. If I use internal clock, it works fine. Could you please give me some help? THANKS A LOT!

What I did was to connect a 50HZ pulse to PFI0 (analog triggering, I changed the code from digital triggering to analog triggering),
For encoder-based (synchronous) measurements, you want to connect the once-per-rev signal (encoder index) to the EXT TRIG input (I forget the PFI numbers), and the N-per-rev signal to the EXT. CLOCK input. Use the EXTERNAL DIGITAL + triggering option, and the EXTERNAL SCAN CLOCK option. Set the NUMBER OF SAMPLES TO ACQUIRE to match your encoder resolution and off you go.
The ANALOG trigger option scans the first ANALOG channel you specify, looking for a transition across the threshold you specify. It does NOT look at the DIGITAL signal in an analog way.
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

Time difference between one Ext Trig and multiple secondary triggers ?

An external device generates a 100 Hz square wave (primary). During
each 10 msec period, another device (secondary) generates multiple
pulses at random times. I want to determine the time, with respect to
each primary waveform's leading edge, when each and every of the
secondary pulses occurs. Not just the first secondary pulse.
Count Buffered Edges.vi example records times when multiple secondary
pulses occur, but there does not seems to be a way to set the counter
value to zero by the primary pulse (especially on STC cards).
The TIO example Two Edge Separation.vi only measures time between the
primary pulse and the first secondary pulse, not all secondary pulses.
The TIO Measure Position.vi fo
r encoder use mentions using the Z-index
on the gate pin to initialize the count value. Is there a way to
combine this with ability to record multiple buffreed time differences
I envision each 100 Hz leading edge resetting a counter (which is
counting a high frequency time base) to zero. Then each secondary
pulse latches that counter's value into memory.
For each count latched by the secondary pulses, it is not necessary to
know within which specific primary period it belonged to.
An alternative is to use two of the Count Buffered Edges.vi and record
the times of both primary and secondary pulses and take their time
difference in software.

Answered on another thread...
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HFORCEKWTID=75037:5&HOID=5065000000080000009EA20000&HExpertOnly=&UCATEGORY_0=_32_%24_12_&UCATEGORY_S=0
Ron

How can I create software start and stop trigger in LabView using 6023E series DAQ card? I don't want to use the external trigger.

I am using 6023E DAQ card to collect the signals, such as AE, Force, Torque from the machine. I want to collect only some part of signal for example between start triger and stop trigger. I'd like to know how I can creat those triggers in LabView from one of the channels that I am acquiring at the same time. I found one or two library file that is only for start trigger. I know that this is availabe in some of DIAdem functions. Please let me know if you have done some example for this requirement.

If you are wanting to create a software trigger based on an analog input voltage in LabVIEW, there are several options. One suggestion would be to compare the voltage values from one input channel to a number within a loop. If the input voltage crosses that threshold (is greater than the number), have a case statement that will acquire data from the other channels. This would simulate a software start trigger in LabVIEW.

Trouble configuring triggers with synchronized AWG and Digitizer

Hi,
I have been working for a few weeks in my project now, and I have a problem concerning the use of triggering options :
I am using a 5412 AWG and a 5142 Digitizer, in a PXI chassis. I have synchronized them using the Ni-TClk blocks provided in Labview. Now, let me explain what I am trying to do.
I need to make sure that the data I will record with the digitizer will be exactly aligned with the start of the sequence I am generating with the AWG. This acquisition is triggered either by the user (let's say a clic on a button) or by an external analog trigger.
I am trying to do that using 2 different kind of triggers : Arm reference trigger and reference trigger.
I am exporting a signal (Marker Event) from the 5412, on the RTSI0 line. This event happens each time the AWG starts to generate a sequence I have defined. I would like the digitizer to trigger off of this event, but only when a event occured first (the user trigger or the external analog trigger). My idea was to generate an Arm Reference Trigger with the "niScope send software trigger Edge", and to "plug" the reference (stop) Trigger on the RTSI0 line.
According to the SMC based digitizers acquisition engine state diagram, the digitizer should start in the idle mode when I initiate the acquisition (with Ni-TCLK Initiate), then it should wait for a start trigger (defined as IMMEDIATE) then it should wait for an ARM reference trigger (the one I want to send by software, or later by an external source). Finally it waits for the reference (stop) trigger which would be the marker event on the RTSI0 line.
According to what I see in my VI, the digitizer seems not to wait for the ARM reference trigger, I guess it directly sees the reference trigger on the RTSI0 line (which happens quite often) without waiting for me to allow it to look for it.
Do you see a mistake in my thinking here? Is it possible to do what I propose? I was thinking that the fact that I use the TClk synchronization might be a source of my problem with the triggers...
If it is not possible to do what I propose, I was also thinking to do what I need another way : Is it possible to somehow combine the 2 events I want to trigger off of? I mean, is it possible to create my own signal which would be high when the external trigger and the marker event are both High, and Low otherwise? And then, route this signal in one of the RTSI lines, which would be the source of a digital triggering...
I hope you will understand what I'm trying to do, and that you will be able to help me.
Thank you very much in advance,
Best regards
Antoine Benard

Hi Antoine,
I have been reading you post for a while and I have concluded
that it will help me a lot if I can have the code; if you were so kind to attach
it to the discussion forum, I will be more than glad to try on my test machine.
“I
need to make sure that the data I will record with the digitizer will be
exactly aligned with the start of the sequence I am generating with the AWG.” In this case, and I will
like to make sure I’m getting this correctly the 5412 is going to trigger the
5142 and either a user control or an external trigger is going to trigger the
5412. In this case the user control or the external trigger is going to start
or stop de generation on the fgen and the fgen will control the scope. So what we really need to do is figure a way of using multiple triggers with the 5412.
I
was also thinking to do what I need another way: Is it possible to somehow
combine the 2 events I want to trigger off of? You can handle this with
another card. Using card with change detection, you can the FGEN trigger from
multiple sources.
I will wait for you answer to make sure I got everything correctly
Jaime Hoffiz
National Instruments
Product Expert
Digital Multimeters and LCR Meters

NiScope xIncrement

I have stumbled upon a bug that is screwing up our FFTs. We are using a USB-5133 digitizer, but I doubt that matters. The problem can be easily demonstrated using the example "niScope EX Digital Filtering.vi", and is present in Labview 8.2 and 8.5 at least.
To demonstrate the bug, open the vi and probe the wires leading to "filtered waveform" and "Spectrum" on the block diagram. Set the min sample rate to 3M, select your device, and run the vi. I see xIncrements of 1.6E-7 and 1525.88 respectively with the probes. These values are correct.
Now turn off the filter. The second xIncrement on my system changes to 762.939. It should not change at all. Now the xIncrement in the FFT is only correct for certain magical values of the sample rate. The FFT itself is now also wrong, but I haven't bothered to figure out exactly how. I don't see a straightforward workaround, since even though I can calculate the correct xIncrement, that information is not passed into the Fetch Measurement vi in an obvious way where I could intercept it and correct the value.
Can someone help?

Hi Chris,
I’m in the team that supports the 5133 and I would be more than glad to troubleshoot this issue with you. I currently have a USB-5133 on my desk and running your same set up. Sampling rate of 3 MS/s and a record length of 4096 (default value for that control) I get a xIncrements equal to: 330ns (1/3.0303MS/s).
Something that I would like you to be aware is that setting a sampling rate of 3 MS/s will coerce to 3.0303 MS/s, because the sampling clock is a divide down of: the “100 MHz onboard oscillator”, 100MHz/X = 3.0303 where X can only be an integer value.
Now the xIncrements for the Spectrum: “The FFT amplitude spectrum is calculated using a split-radix real FFT, and the frequency corresponding to the maximum amplitude is returned. If the input waveform size is not a power of two, the waveform is zero padded to the next higher power of two. The frequency resolution is sampling rate / number of points”.
As you can see the frequency resolution comes from dividing down the sampling rate and the number of samples. The problem you are experiencing is that both of those numbers are actually been coerce to a different value, this value can be pulled from their respective property nodes. I will suggest looking in the Digitizers.chm for the help on that measurment.
Let me know if this helps.
P.D, attach is a VI has all the necessary property nodes.
Jaime Hoffiz
National Instruments
Product Expert
Digital Multimeters and LCR Meters
Attachments:
niScope EX Digital Filtering.vi ‏65 KB

Generic Object Servises- Workflow overview

Hi,
In Me53n transacrion, when I am selecting the Workflow-> workflow overview from Generic Object Services(this icon appears in the left where 'Display Purchase Req. XXXXX' appears ).
I get a message saying "There are no workflows that have already worked with this object", even though the workflow has trigged and work item has been created in SAP Business Work Place for the PR. Please let me know what is to be done so that it shows the workflow log for the object.
Regard,
Shweta

Hi,
This feature is working if the worflow has trigged from BUS2105-RELEASESTEPCREATED, but not working if the worflow is trigged from ZBUS2105-ZCHANGE(ZBUS2105 is subtype and zchange is custome event ).
I have created an entry for this Subtype ZBUS2105 and custom event ZCHANGE SWEC transaction so that the worflow will trigger when PR is saved after being held. I have also set the "Delegate" for ZBUS2105 in transaction SW01 to BUS2105 . This is working fine, but the problem is if the workflow trigger by this custom event then GOS->Workflow->Workflow Overview does not show this workflow item in the overview.
Please tell me what is to be done...

Start Process

HI,
How to start the BPM Process from Webdynpro.Please can anyone help the procedure or some helpful documents how can i start the process from webdynpro application.
Thanks
Swathi

Hi,
1. Import a wsdl file into your bpm. The wsdl file is the one you want to use to start the bpm.
2. in the property tab of the start event, choose "Event Triger" and select the SI which has been imported in the step 1.
3. build, deploy your bpm. Configure the "provided services" in nwa.
4. Get the url for the start event ws and import it into your webdynpro application. The nwds will generate java source code for this ws url.
5. Call the ws in the webdynpro app.
Take a look at this thread: Web Service can not start the process
Regards
Xiang
Edited by: Xiang Zhang on May 31, 2010 2:02 PM

Possible to start MXI-3/PXI system after PC booted?

Hi,
I'm new here, so I just asked this question in another thread through a reply. I didn't notice that it was already marked as solved, so I'm going to ask again in my own thread.
My problem may seem very related to the one of Kobi, but there are some differences which are holding my hopes up that the problem could be solved. The system setup summarized:
- PC (MXI-3)
->PXI1002 (Chassis1)
   ->PXI8335 (port1 - in)
   ->PXI8335 (port2 - out)
   ->PXI5122 (measurement)
     ->PXI1002 (Chassis2)
      ->PXI8335 (port1 - in)
      ->PXI5122 (measurement)
The aim is, as it is easily guessed, to be able to start the additional measurement devices at any time, even while the pc is already running.
The situation differs to Kobis' in one specific point: in my case the cards and all the equipment is at all times visible in MAX, even though I startet it after the pc booted. What does change is the pattern of the leds, and that the PXI cards don't pass the self test in MAX. The following screenshot shows the konfiguration of the system how it is observed after both ways of starting the complete system (pc first or PXI first).
(Even though I'm using an english labview version my MAX partialy remains german, I hope this is no problem.)
I tried to identify the PXI system and chassis, but couldn't get a different result. The NIscope VIs are orderly initialising and resetting all the sessions, but only if I switch on the PXI systems first.
So what do you think, could it be possible to achieve the goal of making it work, or should i stick to booting the pc after switching on the PXIs? I did some research and I know, that the installation guides do specify the order of switching the devices on, but I thought that this was only meant for installation/first run.
I would be really thankfull for any advice in this.
Regards
Max1744
Solved!
Go to Solution.

Hi Max,
there is no way around to first start the PXI. You always have to start the PXI System an d then the PC.
regards
Tobias

Missing Perl Bundle?

Trying to run a Perl script, and I get this response:
Can't locate Image/ExifTool.pm in @INC (@INC contains: /System/Library/Perl/5.8.6/darwin-thread-multi-2level /System/Library/Perl/5.8.6 /Library/Perl/5.8.6/darwin-thread-multi-2level /Library/Perl/5.8.6 /Library/Perl /Network/Library/Perl/5.8.6/darwin-thread-multi-2level /Network/Library/Perl/5.8.6 /Network/Library/Perl /System/Library/Perl/Extras/5.8.6/darwin-thread-multi-2level /System/Library/Perl/Extras/5.8.6 /Library/Perl/5.8.1 .) at /Users/gregscarich/Library/Scripts/Digital Camera Scripts/gpsPhoto.pl line 126.
BEGIN failed--compilation aborted at /Users/me/Library/Scripts/Digital Camera Scripts/gpsPhoto.pl line 126.
Line 26 is:
use Image::ExifTool;
ExifTool is definitely installed as my Ruby scripst use it just fine. Andto confirm:
exiftool -ver >> 6.93
Seeing this thread <http://discussions.apple.com/thread.jspa?messageID=2889730&#2889730> I tried sudo perl -MCPAN -e 'install Bundle::ExifTool' and among other things the response was:
Warning: Cannot install Bundle::ExifTool, don't know what it is.
Try the command
i /Bundle::ExifTool/
to find objects with matching identifiers.
I'm struggling to learn Ruby (I've got little programming background) and want to use the Perl script as part of what I'm doing. I did the above to test that the Perl script would work alone before proceeding. And it didn't.
Thanks for any help.
iMac Intel Duo Mac OS X (10.4.7)

Thank you. Progress. But now I get:
"greatcirclewaypoint" is not exported by the Math::Trig module
Can't continue after import errors at /Users/me/Library/Scripts/Digital Camera Scripts/gpsPhoto.pl line 374
BEGIN failed--compilation aborted at /Users/me/Library/Scripts/Digital Camera Scripts/gpsPhoto.pl line 374.
374: use Math::Trig qw(deg2rad rad2deg greatcircledistance greatcirclewaypoint sphericaltocartesian cartesiantospherical);
I'll try to think about what may be going on. I'll try with other data. The author on line 375ff admits to problems here:
# With this code I can get the symbols from any module.
# Hopefully the interfaces of other modules remain a bit
# more stable than Math::Trig and Math::Complex.
I marked problem as solved; and maybe I'll go a group more involved with this script.
I suppose I know have at least two copies and different versions it appears of ExifTools. Version installed now is Image-ExifTool-6.90. Obviously I'm seriously lacking in UNIX knowledge. I guess it's not easy to have everything use the same version.

TX2 has multiple ghost clicks at the bottom of the screen on startup

My tx2-1025dx has a lot of "ghost" input from the digitizer, all along the bottom of the screen whenever the computer starts up. It is as if someone was tapping all along the bottom of the screen right after I login to the computer. I contacted N-trig and they told me it was my hardware, but I think otherwise. Whenever I uninstall all the ntrig software, and drivers, then reinstall, everything seems to work correctly for a few bootups. Its never long though, before the problem comes back again.
Im running Windows 7, 64 bit

I just today realized that it must be the screens flex ribbon cable must be damaged and needs to be replaced. So if anyone else ever has this problem, try tilting the screen to the left or right and see if it stops. Mine does so it has to be a short in the cable. The cable seem to run around 30 bucks and is fairly cheap compared to what I was expecting I would have had to pay.

Ntsc video signal to image file with PXI-5114?

Is it possible to use a PXI-5114 digitizer to capture a NTSC video signal and reconstuct a single frame to be saved as an image file?

Hi Jason,
I think the example Kyle posted is for the NI 5112 digitizer, which has to use an IMAQ board to video trigger since it does not support video triggering. However, the 5114 is one of the boards that does support video triggering, including the NTSC format. More information can be found in the digitizers help manual (online here). If you are using LabVIEW, we have a basic video triggering example that you can take a look at and try out (the example is called "niScope EX Video Triggering.vi" and can be found from the LabVIEW Example Finder or by going to Start » Programs » National Instruments » NI-SCOPE » Examples from your Windows start menu). If you need to acquire the entire frame, that will probably require you to sample a very large amount of data, in which case you may or may not be able to stream it to disk. In the best case, you can acquire the entire frame in a single record without having to do any streaming to disk. Otherwise, you may need a digitizer that can stream high throughput to a hard drive RAID or something of the sort if you plan on acquiring a large amount of data. Worst case is that it is just too much data, too fast, and it cannot be streamed. Perhaps with more details of the signal and your expected sample rate, we may be able to provide some additional guidance on the possibilities of acquiring the entire frame. Hope this helps!
Daniel S.
National Instruments

How to implement start & stop triggers when # scans unknown on ni5112?

I want to initiate a data capture trigger on the leading edge of a pulse & then stop the trigger on the next leading edge of the same pulse, using NI 5112 Scope card & LabVIEW v5.1. How to accomplish?? Any help appreciated!

You can implement a start and stop trigger but not with an arbitrary number of points.
The 5112 has two triggers the Acquisition Arm and the Record Arm.
The Acquisition Arm trigger enables the Scope to start taking pretrigger data.
The Record arm trigger is often call the Stop trigger or Reference Trigger. Based upon the Reference Position the board will acquire X pretrigger samples and Y post trigger samples. The Reference trigger defines the transition from pre to post trigger. If you set all of your points to be pretrigger (i.e. 100% reference position) then the Reference trigger will stop acquistion on the trigger. One thing to note: the scope will not be ready to accept the record trigger until it has acquired all the pretrigger points. The scope
will only return one record size of data. Therefore the first samples will be lost.
For example I would like to start a acquisition with a trigger on PFI 1 and use edge triggering on channel 0 to stop the acquisition. I need at least 1000 points.
You will need to make the following changes in the code. Start from the niScope EX Configured Acquisition.vi and set up the triggering for Edge Trigger. Set your minimum record size to 1000 samples. On the diagram go to the Edge Trigger Case of the Triggering Selection Case Structure add a property node before the configure edge trigger similiar to the attached screen shot. Change the property to Acquisition Arm Source found in the synchronization menu. Change the property to write and create a string constant. The available sources for the Acq Arm are PFI 1,2 and RTSI 0-6. The syntax needs to match the following: "VAL_PFI_1". You will miss the edge trigger if you have not already acquired 1000 samples from the acquistion trigg
er and you will only get back 1000 samples.
Good luck and let me know if you have any questions.
Mike Taylor
Attachments:
acqarm.jpg ‏66 KB

Graphics returning null in one place, but not another.

If you want to compile and run my program.... you can get all the files here:
http://s94182144.onlinehome.us/randomstuff/files.zip
(The main classes you'll need to look at are DrawingCanvas, Trig and GraphEngine)
Here's a visual just in case:
http://s94182144.onlinehome.us/randomstuff/graph.jpg
When I click the "Graph It" button, I'm sending all those variables in the window to another class. Except the method I need to call is passed Graphics g... and thus, I needed to create a graphics variable. But it's returning null.
Here is my code in GraphEngine, which runs when a button is clicked. You'll notice for Graph It... I created a Graphics variable... this returns null. Except you'll also notice I do the same thing for "Clear"... but this works.
NOTE: I was getting mad so I named some methods not so nicely :p .... you may notice they are different in my files.
     public void actionPerformed(ActionEvent e)
          userDisplay=e.getActionCommand();
          if(userDisplay.equals("Draw"))
               String progChoice=grapher.graphType.getSelectedItem();
               System.out.println(progChoice);
               if(progChoice.equals("Lines"))
                    grapher.allButtons[0].enable();
                    draw();
               else if(progChoice.equals("Scatter Plot"))
                    lineOfBestFit();
          else if(userDisplay.equals("Graph It"))
               Trig.graphThisStuff();
               Graphics g = canvas.getGraphics();
               canvas.trig(g);
           else if(userDisplay.equals("Clear"))
                Graphics g = canvas.getGraphics();
               System.out.println(g);
                canvas.clear(g);
        else if(userDisplay.equals("Reset"))
            Trig.restartThis();
          else if(userDisplay.equals("Credits"))
            showInstructionsFrame();
        else if(userDisplay.equals("Help"))
            showHelpFrame();
        else if(userDisplay.equals("Create Sinusodial Graph"))
            showTrigFrame();

1. Do you expect forum members to download and unzip your code? Good luck...
2. Inside almost every "big" problem is a small one trying to get out. Write a minimal program
demonstrating your problem (say <50 lines) and post that. The shorter code and the easier it
is to copy, paste and run, the more forum members will actually give it a go.
That being said, you problem is that you are using Component's getGraphics at all. Don't use it.
It doesn't work very well -- they rendering you do is temporary, if you iconify and restore your
window your changes will disappear (sometimes even moving another window past yours will do this!).
What should you do instead? Put all your rendering code in paintComponent (or subroutines
it calls). Changes in state of your app should trigger a call to repaint (or you will call it directly).
Repainting will eventually cause your paintComponent to be called.

Calculating Distance given a 4 point 2D image

Hi All,
3d n00b so play nice :-)
I'm trying to use a Wii remote camera to calculate real world distance from an object in Java.
The Wiimote will supply me the x and y coordinates of the 4 point object, which is actually 4 lights on the floor in this configuration.
I know the exact measurements of the 4 objects and the distance between them in the real world.
I know the 2D co-ordinates as represented on a 1024x768 screen.
I know the Angle of the Wiimote.
The lights will only ever be on a flat horizontal plane.
Is there anyway to reverse transform the 2D image from the camera back into 3D, taking into account the fact that the image may be rotated, and thus calculate the distance in the real world?
I'm guessing its some clever trig and some wizzy transformations although its been 20 years since I was in school! :-)
If you need any more explenation I'd be happy to attach some drawings.
Thanks in advance.
Uzerfriendly

hi
did you ever find out anything regarding your query?
i was trying to solve maybe a similar problem
though i'm not sure
how can i calculate the distance of an object of a known size (say, a person) that appears in a picture
presupposing the picture was image is not magnified or is somehow "sstandardized" or somehow "like" human vision
does it make any sense?
be happy to hear
thanks
doron

NIScope 2.7: SW Trig and PXI5112

Similar Messages

Maybe you are looking for