Time averaging problem - signal express

Can somebody help me with this problem? I am trying to perform time averaging from signal in Signal Express but the input and the output signals are the same. Attached is the printscreen of the process. Can somebody tell me what I am doing wrong?
Attachments:
signal.JPG ‏51 KB

You should post to the SignalExpress board.

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LabVIEW Signal Express, averages

Hello,
I'm brand new to LabVIEW. I have a temperature signal from a thermocouple up in LabVIEW express, and I'm trying to get an average of this signal because it's very noisy. Can anyone provide me with very detailed help (as I'm brand new, and have no idea how to do anything in LabVIEW).
If it's of any help, I have LabVIEW 8.5 and LabVIEW Signal Express 2.5.1. Thank you!

Hello ddrop,
To add to Intelligent's post, here is another example to show you how to create a running average of an array. I am not sure how you have your measurements recorded (if you are creating an array), but this example should give you some added guidance.
You mentioned you were using Signal Express and there are a set of Signal Express examples that may also be helpful. You can find the examples by going to Help>>Open Example... This should take you here: C:\Program Files\National Instruments\SignalExpress\Examples. From there, you can go to Loops>>Frequency Sweep with Averaged Measurement.seproj. While this example does not do exactly what you are doing, it will at least give you an idea of how to do averaging in Signal Express. Another way to incorporate the averaging in Signal Express would be to do a Run LabVIEW VI step. I hope this helps!
Kim W.
Applications Engineer
National Instruments

Export to Excel problem in Signal Express 2012

Equipment used: PXIE-8102 CELERON T3100 1.9GHZ Controller Windows 7, PXIE-1071 4 Slot Chassis, PXIE-4140 4-Channel SMU 1.7.5 version.
I am using Signal Express 2012 and the SMU to plot the I/V characteristics of FET and other active devices. I am able to obtain the anticipated curve traced results but I am not able to Export the data to Excel directly from the Data View using the Microsoft Excel option. The error message is: Data could not be sent to Microsoft Excel. Please ensure you have a properly licensed version of Microsoft Excel. See attachment.
We have checked our version of Microsoft Office, it is Professional Plus and has the correct volume license so it does not revert to a home or student version.
I have been able to use the Export to Excel function directly from the Dataview when I was using one of the waveform tutorials supplied with Signal Express so I suspect it is a function of the SMU.
In conversations with an NI support engineer he felt it may be a problem with "an active x call is just not seeing the license for some reason", his suggestion is to drag the data into Excel rather than use the Data view tab. Because the SMU is being used in a production environment it is not really appropriate to have the operator work at this level so I would rather figure a way to have the data exported using the Data View tab.
Anyway please can you let me know if there are any known work around for this issue.
Thank you

Calvin1957,
I am not seeing any attachments in the first post or this latest post. The images should be added using the attachments section when creating the post. You should also be able to insert an image using the insert image button in the toolbar. Let me know if you have any questions. Thanks!
Robert B
Applications Engineer
National Instruments

Averaging pmt signal and strange signal shift problem with recording

Hello
I'm a researcher at UCL and am quite new to Labview. I have a PMT and i've successfully created a program to read/show and write the data. From the signal I need the average pk to pk value and the average mean value. Is there any way I tell labview to average the signal out then display it and then write it to the file?
Also, I came across a weird problem. I have split the output signal of the PMT to an oscilloscope and the daq card. When I press record in labview I see a shift in the signal seen on the oscilloscope and labview records that shift. Why is this happening? I'm guessing the circuits of the daq and pmt are not completely isolated so how could I solve this problem?
Any help is really appreciated because I'm quite clueless about what to do next
Thank You
thh

Hello THH,
You could use the probability and statistics pallet found in the functions menu under mathematics, this will contain a mean value function which you could feed your data into. As for writing the data to a file I have attached a simple VI I'm am about to post as a community example that can help you understand how to format text files.
As for the problems you are having with the signal shifting, this could be due to a few reasons. The first is an impedance mis-match between the scope and DAQ card, you can check our website for the specifications of your card. The Second reason could be a ground loop issue, you could solve this using an opto-isolator circuit.
Hope this helps
Kind Regards
Regards
Andrew George @ NI UK
Attachments:
Text File Manipulation.zip ‏23 KB

Hi, i have purchased iPhone 5 about 15 days ago, its working well but only one problem that it has is that some time its losting signal and appear as no serves. would you please help me in this reqard. thanks

Hi, i have purchased iPhone 5 about 15 days ago, its working well but only one problem that it has is that some time its losting signal and appear as no serves. would you please help me in this reqard. thanks

Well, it could be that your carrier doesn't have a signal when it looses its signal. You could try resetting network settings which might help - Settings/General/Reset/Reset Network Settings. You'll need to set up any wi-fi networks you connect too again. If you're still having issues, contact your carrier.
Good luck!

Joint time frequency analysis in Signal Express?

Is it possible to do joint time frequency analysis in Signal Express? I didn't see it in the Analysis section, so I'm assuming it's a separate tool that has to be added, if even possible in Signal Express. Help?
Solved!
Go to Solution.

SignalExpress does not natively support joint time frequency analysis. However, check out the Sound and Vibration toolkit which expands upon SignalExpress. It may do what you want.
This account is no longer active. Contact ShadesOfGray for current posts and information.

Why can I only import one TDMS signal at a time in Signal Express?

I have dozens of data files which were originally recorded as LabVIEW waveform files. I converted them all to TDMS in LabVIEW in hopes that I could import them to Signal Express (with the S&V Suite) for further processing. Each data file contains more than 20 channels.
When I try to import them to SE, I am unable to import the entire group. Instead, I am limited to one channel at a time. This would take days to import all channels, and is not what I want at all. Is there some way to import an entire group of channels at once?
JR

I was using the "Logged Signals from LabVIEW TDMS file" import; perhaps I had installed it on SE 2.5 before upgrading to 3.0. Regardless, I downloaded the ZIP file, and ran the msi with the "Repair" function. This did not change the functionality. I then used your suggestion, and redigitized one of the files with the Express VI set for TDMS. Same deal, although instead of the channel names I had been able to specify using the TDMS subVIs, now it lists them all as "Voltage_x", where x is a channel number beginning with 0.
I've attached two images as examples of what I'm experiencing. The first (temp1.JPG) shows where I've tried to select the entire group. You can see that "Convert File" is not enabled, and the sample information has not been read. The second image (temp2.JPG) shows where I've selected a channel. I am only able to select one channel, not a range. The "Convert File" button is now enabled, and sample information is correctly displayed.
Attachments:
temp1.JPG ‏57 KB
temp2.JPG ‏57 KB

Will Time Capsule or Airport Express resolve my WiFi problem?

Hi
I have a regular 2.4 GHz WiFi router which i am using currently. The problem is there are too many WiFi users around me and it seems my WiFi keeps turning off due to interference. I have tried chaning channels but all in vain. Initially I thought it was a router issue but now I have turned off WiFi completely and using internet on ethernet cable and it has been working fine without any disconnection. So definitely it is the WiFi interference problem. I really want to use WiFi as i want the mobility. Do you think using a time capsule or Airport Express resolve this problem?

It is troublesome. Use ethernet instead of wireless.
Reset the whole network to factory and start again.
Yosemite can see nothing that it does not setup itself it seems.
Factory reset universal
Power off the TC.. ie pull the power cord or power off at the wall.. wait 10sec.. hold in the reset button.. be gentle.. power on again still holding in reset.. and keep holding it in for another 10sec. You may need some help as it is hard to both hold in reset and apply power. It will show success by rapidly blinking the front led. Release the reset.. and wait a couple of min for the TC to reset and come back with factory settings. If the front LED doesn’t blink rapidly you missed it and simply try again. The reset is fairly fragile in these.. press it so you feel it just click and no more.. I have seen people bend the lever or even break it. I use a toothpick as tool.
N.B. None of your files on the hard disk of the TC are deleted.. this simply clears out the router settings of the TC.

TDS2024B Signal Express 2.5 problem

Hello.
I have a problem with SignalExpress 2.5, I have installed SignalExpress 2.5 to use it with my Tektronix TDS2024B, but it does not detect the scope in all...
I have install the package tktds1k2k_setup.exe too... but no way... in "add step" i can not see the Tektronix Label as in my old SignalExpress Tektronix edition (installed in other PC)
How can i add the scope to be able to acquire signals?
Thank you!

Mangatrade,
Check the following link for information about how to use your third party instrument with Signal Express.
http://digital.ni.com/public.nsf/allkb/BC2CE741752EE09086256FFE00779D67
Dario Camargo
NI Brazil
#1186109

Report generation toolkit and signal express user step : problem of closing reference in "Stop" event

Hi all,
I'm trying to make a package of Vis to easily make Excel reports with Signal Express. I'm working on LabVIEW 8.2.1.
I'm using the report generation toolkit, so I build a .llb from my project which contains all the hierarchy of my steps, but also the hierarchy of dynamic VIs called.
I have made some steps, like "Open Workbook", "Write Data", etc.
My steps run well, excepts one step : "Close Workbook".
If my "Close Workbook" step is firing on "Run" Signal Express event, I have no error, so my reference is properly closed.
But if my "Close Workbook" step is firing on "Stop" Signal Express event, I have an error "1", from "Generate Report Objectrepository.vi".
I feel that I'm trying to use a reference which has been killed in the "Stop" step...
I would like to know what exactly do Signal Express on "Stop" event and why my close function does'nt run well.
Thanks,
Callahan

Hi Callahan,
SignalExpress (SE for short) does the following on the Stop event:
1. Takes the list of parameters that SE found on your VI's connector pane, and sets the values that the user set from the "Run LabVIEW VI" configuration page, if any.
2. Then tells the VI that SE is running the Stop event by setting the Enum found on your VI's front panel. This in turn should produce some boolean values telling your VI to execute the Stop case.
3. The VI is then run, with those values and states.
4. SE checks to see if any errors where returned.
5. Since this is the Stop event, SE releases the reference to the VI which it possesses.
Questions for you would be, is the reference to your Workbook linked to a control on your connector pane, or held in a uninitialized Shift Register. If it's held in a Shift Register, SE would not be aware of it, and would not be able to affect that reference.
Hope that helps. Feel free to post your LLB if it doesn't.
Phil

Problems activating signal express 2.0 in labview

Hello,
I have purchased a copy of LabVIEW Base Edition 8.2.1 and Signal Express 2.0. I receive the following error when I create a LabVIEW VI containing a Signal Express VI (in this case a Signal Express Create Signal VI):
NI_MAPro.lvib:
This library is invalidly licensed for this computer. Please contact your National Instruments sales representative to request an upgrade to access the functionality of this library.
NI_Gmath.lvib:
This library is invalidly licensed for this computer. Please contact your National Instruments sales representative to request an upgrade to access the functionality of this library.
NI_AALPro.lvib:
This library is invalidly licensed for this computer. Please contact your National Instruments sales representative to request an upgrade to access the functionality of this library.
I have activated both the LabVIEW application and the Signal Express application and they both work fine indepedently.

Some SignalExpress 2.0 Express VIs require functionality that is only available in LabVIEW Full or Pro. Therefore, if you have LabVIEW Base and drop the Create Signal Express VI, your VI will be broken. (If you convert the Create Signal Express VI to a subVI, you could find the VIs in question).

How do i stop the automatic load of signal express every time i plug in an USB device?

This is the most invasive thing I have experienced with NI products. The only choice you get is to select a trial offer or pay for a license you can't X out.

what happens if you right-click on the NI Device Monitor in the notification area and click "clear all device associations"?
SCXI- 1000 Chassis w/ 1346 adapter
PCI 6281 DAQ card
SCXI- 1520 Bridge Board w/ 1314 Terminal Block (x2)
SCXI- 1180 Feedthrough Panel w/ 1302 Block
Signal Express 2014.
Win7 Enterprise

Can I use Signal Express for multiple customers for only the one time $699?

How do I go about distributing Signal Expresss applications to multiple customers?

Hi Nutter,
Unlike LabVIEW, Signal Express doesn’t have any file distribution capabilities. If your application uses only basic features, you could install the free LE version of Signal Express on as many computers as necessary. If you need the full capabilities of Signal Express, however, you would need to purchase a license for each customer.
An alternative to paying for Signal Express for each customer deployment would be to generate LabVIEW code from the Signal Express project and create an executable. This process is described in the Knowledge Base articles Generate LabVIEW VIs from Signal Express and Deploying VIs generated in Signal Express. Note that this method requires that you have LabVIEW installed on your development computer with Application Builder capabilities.
Regards,
Message Edited by Luke G on 05-02-2007 12:23 PM
Luke
Applications Engineer
National Instruments

Signal Express Large TDMS File Recording Error

Hello,
I have the following application and I am looking for some tips on the best way to approach the problem with Signal Express:
I am attempting to using Signal Express 2009 (Sound and Vibration Assistant) to collect random vibration data on three channels over an extended period of time -- about 20 hours total. My sample rate is 2kHz. Sampling at that rate over that period of time invovles the creation of a very large TDMS file, which is intended for various types of analysis in signal express later or some other application later on. One of the analysis functions to be done is a PSD (Power Spectral Density) plot to determine the vibration levels distributed over a band of frequencies during the log.
My original solution was to collect a single large TDMS file. I did this with Signal Express recording options configured to save and restart "in current log" after 1 hour worth of data is collected. I configured it this way because if there is a crash/sudden loss of power during data collection, I wanted to ensure that only up to an hours worth of data would be lost. I tested this option and the integrity of the file after a crash by killing the SignalExpress process in the middle of recording the large TDMS file (after a few save log file conditions had been met). Unfortunately, when I restart signal express and try to load the log file data in playback mode an error indicating "TDMS Data Corrupt" (or similiar) is displayed. My TDMS file is large, so it obviously contains some data; however, Signal Express does not index its time and I can not view the data within the file. The .tdms_index file is also present but the meta data.txt file is not generated. Is there any way to insure that I will have at least partially valid data that can be processed from a single TDMS file in the event of a crash during mid-logging? I don't have too much experience dealing with random vibration data, so are there any tips for generating vibration level PSD curves for large files over such a long time length?
My solution to this problem thusfar has been to log the data to seperate .TDMS files, about an hour in length each. This should result in about 20 files in my final application. Since I want to take a PSD, which ends up being a statistical average over the whole time period. I plan on generating a curve for each of these files and averaging all 20 of them together to get the overall vibration PSD curve for the 20 hour time period.

JMat,
Based on the description of your application, I would recommend writing the data to a "new log" every hour (or more often). Based on some of my testing, if you use "current log" and S&V Assistant crashes, the entire TDMS file will be corrupted. This seems consistent with what you're seeing.
It would be good if you could clarify why you're hoping to use "current log" instead of "new log". I'll assume an answer so I can provide a few more details in this response. I assume it's because you want to be able to perform the PSD over the entire logged file (all 20 hours). And the easiest way to do that is if all 20 hours are recorded in a continuous file. If this is the case, then we can still help you accomplish the desired outcome, but also ensure that you don't lose data if the system crashes at some point during the monitoring.
If you use "new log" for your logging configuration, you'll end up having 20 TDMS files when the run is complete. If the system crashes, any files that are already done writing will not be corrupted (I tested this). All you need to do is concatenate the files to make a single one. If this would work for you, we can talk about various solutions we can provide to accomplish this task. Let me know.
Now there is one thing I want to bring to your attention about logging multiple files from SignalExpress, whether you use "current log' or "new log". The Windows OS is not deterministic. Meaning that it cannot guarantee how long it takes for an operation to complete. For your particular application, this basically means that between log files there will be some short gap in time that the data is not being saved to disk. Based on my testing, it looks like this time could be between 1-3 seconds. This time depends heavily on how many other applications Windows has running at the same time.
So when you concatenate the signals, you can choose to concatenate them "absolutely", meaning there will be a 1-3 second gap between the different waveforms recorded. Or you can concatenate them to assume there is no time gap between logs, resulting in a pseudo-continuous waveform (it looks continuous to you and the analysis routine).
If neither of these options are suitable, let me know.
Thanks, Jared

LEGO Mindstorms 2.0 crashes at startup when LabView Signal Express is installed first

When NI Circuit Design Suite Education Edition is installed first in a computer and the LEGO Mindstorms software second, the LEGO Mindstorms software doesn't work, it reports the following:
Error: A required file is broken
Possible Solutions: Reinstall the LEGO Mindstorms NXT Driver (tried but doesn't work)
Error code: 1003
Ordinal not found
The ordinal 18 could not be located in the dynamic link library NIVISV32.dll
Error loading "fantom.dll"
The operating system can not run %1
On other computers the LEGO software starts running, it displays part of the initial screen and then a small window opens saying that the Mindstorms software has has an error and that it will close. The previous report doesn't show.
If LabView Signal Express is uninstalled and then the LEGO software reinstalled, the LEGO software works.
I've dowloaded and installed new and old versions of the NIVISV32.dll and this doesn't correct the problem. I went as far as version 4.20 of the dll because it is dated in 2007 and the dll file installed by the LEGO software when it works is also dated 2007, but if I install the dll without uninstalling LabView Signal Express, the LEGO software continues not working.
Please advice how to correct this problem without having to uninstall LabView Signal Express first. If the LEGO software is installed first, is LabView Signal Express going to use and not to replace the old 2007 version of the dll installed by the LEGO software? Is there any LEGO software update that corrects this problem?
I repeat: I know a solution is to uninstall LabView Signal Express, install LEGO Mindstorms and then reinstall LabView Signal Express but I have 60 computers already cloned and deployed with this problem, so I don't want to go to this long process to fix the problem. The computers are using Windows 7 and problems happen on both the 32 and 64 bits versions of Windows 7.
Any ideas???
Solved!
Go to Solution.

I couldn't reproduce the error either, but in our x86 computers this problem appeared after several months; we used LEGO Mindstorms last time in Summer 2011 without any problems and just three weeks ago when we were checking the computer for our Summer 2012 classes if when we noticed the problem. I’m still going to try to reproduce the error in an x64 computer where the problem appeared immediately.
Anyway, I’m attaching a word file with images of captured screens where you can see the error reports generated by LEGO Mindstorms and a series of steps uninstalling and reinstalling these program plus LabVIEW, until LEGO Mindstorms finally works after having uninstalled all traces of LabVIEW.
Images can be expanded and zoomed in to a better view of the details and if I can reproduce the problem in an x64 computer I’ll let you know.
Please see if you can find out something based on the images I’m sending.
Thank you.
Attachments:
LEGO PROBLEM.doc ‏3129 KB

Time averaging problem - signal express

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