Plot n spectra

Hello -
I have 3 individual power spectra, saved to three separate waveform graphs. This cannot change, but I'd like to make a summary view that shows all three displayed on the same graph. Problem is the "merge signals" function that I usually do to perform this...isn't working.
Error is that the spectra are clusters and I'm trying to plot to dynamic data type. I've also tried the convert to dynamic data, but it won't accept a cluster as an input. (Plenty of other options though.) Also...tried converting using the cluster to array on each of the individual spectra but I get an error there also that the clusters mismatch.
Any ideas here....i've not ran into this issue before with simple plots but this is my first time with using spectra - maybe special consideration has to be taken into account?
LV7.1, LV8.5

Take the three waveforms, build array of waveforms and then wire the array to the waveform graph.
Paul Falkenstein
Coleman Technologies Inc.
CLA, CPI, AIA-Vision
Labview 4.0- 2013, RT, Vision, FPGA

Similar Messages

Waterfall plot acquired in real time doesn't match when it is read offline.

Dear fellow LabVIEW experts,
I'm in need of help regarding the waterfall plot in LabVIEW. I acquired vibration signals of a CNC router during idling. The accelerometer was attached to the tool spindle in proximity to the rotating tool. Using a LabVIEW program (LV 2010), I saved my data (using write to spreasheet function) and I also had a waterfall plot showing the vibration spectrum built up as I was collecting the data. I used the Print Screen function on the keyboard to copy the waterfall plot (collected during real time data acquisition) and pasted it in a Word document. Then, I had another LabVIEW program that was able to read back all the data that I've saved including a waterfall plot that was used to reproduce the vibration spectrum that I've collected. After I read back my data (offline), I compared the vibration spectra between the real time and offline. The vibration spectrum that is collected during real time is supposed to match with the vibration spectrum that is reproduced when reading back the same data.
My problem is this, when I changed the location of the accelerometer or the vibration sensor to a new location (a bit far up and away from the rotating tool), the real time and offline vibration spectra didn't match in that the offline one showed some additional frequencies or peaks that weren''t there when I was collecting it in real time. Does anyone know why this happens?...Is it something to do with the buffer?
I've tried my best to explain and I hope someone out there is able to explain this situation.
Really appreciate any helps.
Thanks.

TiTou is right some screen shots would be helpful,
But these are good references too: http://zone.ni.com/devzone/cda/epd/p/id/5607 http://zone.ni.com/devzone/cda/epd/p/id/1425 http://zone.ni.com/devzone/cda/epd/p/id/5523
Sam S
Applications Engineer
National Instruments

RPM / Frequency Color Plot best strategy

Hello,
I'm trying to do some Order Spectra Analysis and I'm receiving an Out of Memory error once I'm trying to plot an RPM-Frequency colormap. I'm not sure I'm doing the right thing that is why I need some help from you. The data I'm trying to analyze it is offline data sampled at 51.2kS - a few minutes. I'm reading from the TDMS file chunks of 10 seconds (max 512kS) and for each chunk I'm using the OAT Analog Tacho processing for speed calculation and OAT Spectral MAP (Waterfall) to process the data. I'm using the Waterfall and not the Colormap because I'm buffering the spectrum using SVX Buffer Waterfall Graph (Waterfall Data).vi. Once I'm process all the chunks I'm converting all Waterfall Data to Colormap data using SXV Convert Waterfall to Colormap.vi. When I'm using the OAT spectral map, I select the window length depending of the X scale of the color plot, Width of the Colormap and Sampling Rate to make sure I will not have more that 1 frequency line / pixel. Unfortunately I can not do the same thing on the Y axis because I don't know the RPM limits of the signal so I can not adjust speed segment step to an RPM that is efficient for the resolution of the graph and maybe that cause the Out of Memory error when I'm trying to do RPM / Frequency analysis. What is strange is that sometimes the output of the spectra analysis is very strange, the value of the dz (RPM step) is negative. For example if I set 125 RPM then the dz it comes -125. What could cause this issue and how can I improve my code ?
Thanks in advance,
Alex

Hi Alex,
There are some general ideas for improving the efficiency of your code listed in the article How Can I Optimize the Memory Use in My LabVIEW VI?. A full description is laid out in VI Memory Usage.
After trying those steps, if you still need more memory, try increasing the amount of memory that LabVIEW can access in your system as described in the article How Much Memory can LabVIEW 32-bit or 64-bit Use? or you could consider creating virtual memory as described in How Can Virtual Memory Help with Memory Issues in LabVIEW?
Another option is to isolate the source of the issue. You can use the VI Profiler to diagnose your VIs (if you have subVIs) and see which one is consuming too much memory. This is described in the article How Do I Use the VI Profile Window?
- Regards,
Beutlich

Labview code to trigger and scan spectra from HR4000 spectrometer?

has anyone used labview code to trigger and scan spectra from HR4000 spectrometer? When I use one of the device drivers (Spectral Acquisition.vi), i miss lots of trigger when I run it for more than 100 iterations?
I was wandering if anyone is working with it or had in the past and if you could share your insight.
Thanks

Inconsistent times are one thing, overall slowing down is another, although they may have common source. I guess it is the XY plot in your case. Do you have it AutoScaled? If so, try turning autoscaling of both axes off.
Secondly, I don't quite understand the reason for the inner loop with number of iterations = constant 1. What happens if you remove the loop? I understand you want to change the number of iterations in future, but let's test the simplest things first. Removal will require indexing the Wavelength array explicitly with an apropriate block. By the way, it is customary that you EITHER define the number of iterations of a FOR loop by connecting the N input OR by indexing of an input array - NEVER both at the same time. Maybe, changing the multiple XY plot into a single XY plot won't be necessary, maybe it will, try for yourself.
Thirdly, I suggest you try enclosing the XY plot block alone in a case structure (say, in its TRUE window) and set the true condition to occur at some fraction of the total iterations, not every cycle. You do this using the index "i" of the main iteration loop, calculate modulo something (e.g. 10) and test if it is true or false. This way you update the XY plot every 10th iteration only and by choosing different modulo divider you can test, if the plot's display is or isn't the beast slowing things down.
Finally, I suspect it is not necessary to use a Local Variable of the seconds 2 indicator. How about simply wiring the output of your To-double block to the input of the subtraction block? That should let you remove seconds 2 local variable with no harm done.
Daniel

LabView for Response Spectra Generation

I am searching for someone who has used LabView to develop response spectra
(also known as shock spectra) plots from DAQ using NI board. I have a fortran
executable response spectra program, but do not know how to execute it within
the LabView environment. Any assistance would be greatly appreciated. I'm
desperate!

Well,in fact I do have a Sound and Vibration Add-on in my labview. My plugin version is May 2003 Edition and I can´t seem to find any SRS VI, the attached file is a picture of my SVT Palette. Could you try to point me which SVT palette this SRS VI is supposed to be located in?
Attachments:
svtpalette.JPG ‏16 KB

How can I represent more than one plot in an only one chart?

Hello everyone,
i got a code where I don't understand how to represent more than two plots, with different scales each, in the same waveform chart.
As brief review:
* 2 adquisition data wired to Bundle
* wire from Bundle to waveform chart.
* options of th chart: stack plots.
I've tried to expand the Bundle but the problem is that I'm wiring a 3 element cluster to a 2element cluster chart. I don't understand how to upgrade the chart...
(there's the two plots in each chart)
(there's the code, where I've already tried expanding any bundle and wiring other signals, then wiring the bundle's output to the chart)
I think if I could add more scales, it will be possible to plot three plots on the same chart.
Thank you for your time
Marcelo A J

Since you are dealing with waveforms already, I think you actually want to have an array of waveforms to go into your chart. You also need to map the plots to the scale that you want to use. You can do that in the plot tab of the properties window.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines

How to get lab view to display my plot in DB

hi guys
i desigED n an operational amplifier to determine the gain product band width using a 741 chip and the gain of the circuit is 1000, meaning that the gain bandwidth PRODUCT will occur at a frequency of 100hz. but i have a problem, when i start the frequency sweep from the function generator from 10 hz to 100Khz which IS the final frequency value i have set for the program. when the lab view program stops and i export the data to excel sheet i will be getting the DB axis value in a SMALL VALUES AND IN DIFFERENT UNITES WHEN I PLOT THE GRAPH USING EXCEL, while the frequency is in log10.
pls can any one tell me how to solve this problem to start getting the right cut off frquency on the graph. find aattched my vi and the excel data from the vi that is in a different unit not in DB
Attachments:
GAIN BAND WIDTH PRODUCT.vi ‏116 KB
FREQUENCY VALUE .xls ‏26 KB

Ahhh.....
emeho wrote:
thanks Jeff Bohrer for your reply, what i mean is the y-axs of the plot is in DB aleady, but when i export the data to excel i will be seeing the gain in 0.8, 0.7,0.4 which is not normal, which will not give me the -3db point of the gainband width product of the circuit
What you want to do is plot the Log(10) of the frequency on a linear axis!!!!!!! The export - exports the values not the axis scale. exporting a log(10) of the Y axis will export the log of the axis- (of couse, you could change the graph axis scale in Excel too...... but)
Jeff

How to Plot number and string in one row (data logger counter via MODBUS) ?

hi all i made data log quantity using Digital Counter via modbus (RS-485) to monitoring quantity and reject that has and Name Operator, Machine and Part Number.
i have problem about plot the number & string in one row, as shown on the picture below :
how to move that string on one row ? i attach my vi.
Thanks~
Solved!
Go to Solution.
Attachments:
MODBUS LIB Counter.vi ‏39 KB

Hi rhiesnand,
right now you add 2 new rows to your array.
The solution is to concatenate both row parts to one bigger 1D array before adding that array as new row to your 2D array!
Like this:
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

How to Plot number and string in one row (data logger counter) ?

hi all i made data log quantity using Digital Counter via modbus to monitoring quantity and reject that has and Name Operator, Machine and Part Number.
i have problem about plot the number & string in one row, as shown on the picture below :
how to move that string on one row ? i attach my vi.
Thanks~
Attachments:
MODBUS LIB Counter.vi ‏39 KB

Duplicate and answered - http://forums.ni.com/t5/LabVIEW/How-to-Plot-number-and-string-in-one-row-data-logger-counter-via/m-p...

How to let the user define the colors for each plots in the graph (I use LabVIEW 7)?

How to let the user define the colors for each plots in the graph (I
use LabVIEW 7)?

Hi,
Take a look at this example, it uses property nodes to select tha
active plot and then changes the color of that plot.
If you want to make the number of plots dynamic you could use a for
loop and an array of color boxes.
I hope this helps.
Regards,
Juan Carlos
N.I.
Attachments:
Changing_plot_color.vi ‏38 KB

After upgrading to windows 8, spectre 14 usb3 slow

are there any usb3 fast drivers for spectre 14 after upgrading to windows 8, the drivers of windows 7 there are not compatible with windows 8

Hello rumbacha. I understand you're trying to locate some drivers for your SPECTRE for Windows 8.
There are quite a few versions of the SPECTRE so I will need your product number to identify exactly which model you have. This document can show you where the product number is located.
Once I have this I will attempt to locate the drivers for you.
Have an excellent day!
Please click the white star under my name to give me Kudos as a way to say "Thanks!"
Click the "Accept as Solution" button if I resolve your issue.

Spectre ultrabook speaker

HP Sectre Ultrabook / Windows 8.1/ Can not seperate controls for ultrabook speakers from headphone jack. When I plug in headphones to the 3.5mm jack on the side there is an acknowledgment that headphones are plugged in and sound does come through, but the level controls remain with the pc speakers. When I look at ultrabook speaker proprieties it lists them as being attached to the 3.5mm jack. See picture below. Here is an image of playback screen with headphones plugged in as well. This is a problem for me because the laptop audio settings are already really loud out of the headphone jack. I had the ultrabook set at 65% volume and plugged the headphones in and started playing some music. I thought I had blown my headphone speakers and would have blood coming out of my ears it was so shreekingly loud. I am already hard of hearing but I can only have the volume at 30% on this ultrabook before it starts getting too loud out of the headphones. I thought that maybe it had something to do with the Beatsaudio settings but they are tied together it seems.

Hi Hatemicrosoft,
Thank you for visiting the HP Support Forums and Welcome. I have read your thread on your HP ENVY Spectre Ultrabook and sound issues. Here is a link to download software for Windows 8.1.
Hope this helps.
Thanks.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

Crackling sound while playing music in HP SPECTRE 15-4010nr Ultrabook

Hi all,
I have recently bought [4th Jan. 2013 ] HP SPECTRE 15-4010nr Touchsmart ultrabook with beats audio.
I am very unhappy with sudden/random crackling bursts of noise while playing music.
The problem is not restricted to hp inbuilt speakers as it also reaches on headphones, so it's something internal to laptop.
Its really disappointing to have such a bugging issue from this high end laptop.
Please let me know if there is a solution to this problem.
Thanks in advance!!
This question was solved.
View Solution.

Yeah even for me it seems unhooking power adapter does the trick !
Even my Laptop is just 4 weeks, how could manufacturers let so common bug seep through their high end laptops.
Are these not tested for audio video quality ?
Anyways I need an alternate fix as I do not want to lose my laptop for a month, in exchange or return process.
P.S.: Sound drivers re-installation is of no use.
HP Guys, thanx for ur concern, but if u can give a fix for AC adapter noise interfernece it will be great. !!

HELP! HP Envy Spectre XT Ultrabook with NO sound!

I currently have no sound on my HP Spectre XT Ultrabook PC!!! Upon buying the laptop it had Beats audio on the laptop. That stopped working recently, but I still had the normal reduced audio, until that stopped completely soon after. I have tried multiple things to fix this problem, all without success; I tried troubleshooting the problem, I tried updating the audio driver (it said I already had the most current version), I tried uninstalling and reinstalling the driver, I tried updating the BIOS on my computer and NONE of these have worked; I still have no sound! Please help to fix this problem!

Since today is HP expert support day, if there is an expert out there, PLEASE help fix this problem!!!!!!!!

No Beats Audio on spectre X2 ultrabook

My freshly installed HP spectre X2 is supposed to have great sounds powerded by beats audio. Actually I cannot see any trace of beats adio and the sound is quite poor.
Any idea where to find drivers and software?
Thanks
Frank
This question was solved.
View Solution.

Thanks for the information! Instead of using Support Assistant, can you download and install the driver directly from this link: IDT Audio Driver
If there is an error, please type it out so I can continue to assist you!
Mario
I worked on behalf of HP.

Plot n spectra

Similar Messages

Maybe you are looking for