topic Re: LabView code for Allan Variance? in LabVIEW

LabView code for Allan Variance?

RFB-LMCO — Tue, 11 Jan 2005 13:46:55 GMT

Is there a LabVIEW tool for Allan Variance?

Re: LabView code for Allan Variance?

shahina — Thu, 13 Jan 2005 23:09:05 GMT

Hello,

There is no single VI that computes Allan Variance, but you can definitely code it yourself using Analysis VIs (under All Functions -> Analyze -> Mathematics -> Probability and Statistics and others).

Thanks and have a great day!
Shakhina Pulatova
Applications Engineer
National Instruments

Re: LabView code for Allan Variance?

HansjoergScherer — Tue, 08 Feb 2005 14:40:43 GMT

You will find a library called Allan_Statistics.llb
under (NI path):
NI Home > NI Developer Zone > Development Library > Measurement and Automation Software > LabVIEW > Development System > Fundamentals > Graphs and Charts
or (URL):
http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=EF32F4D54B4A211CE0340003BA230ECF&p_node=DZ52028&p_source=external

Have fun - any feedback to the author about the usefulness of this tool is appreciated!

Re: LabView code for Allan Variance?

suethechemist — Tue, 17 Jul 2007 10:07:30 GMT

Anyone care to send me images (screen capture) of the Allan variance code found at the url given above? I'm using LabVIEW 6i (6.0.2?) and can't open it... I'll contact the author if this is going to take too much effort - it's been a few years since he posted though.

Re: LabView code for Allan Variance?

GerdW — Tue, 17 Jul 2007 11:29:11 GMT

Hi suetheche...,

here it comes in LV6.0. I just converted the actual calculation vi and change the comments from German to English.

Re: LabView code for Allan Variance?

suethechemist — Mon, 30 Jul 2007 11:14:28 GMT

I never did get round to saying thank you GerdW - so thankyou!

Haven't had a chance to try it out yet either, but it was much appreciated.

I'm suethecheMIST by the way, but I quite like suetheche, has a ring to it!

Re: LabView code for Allan Variance?

Subliminal — Mon, 17 Mar 2008 19:36:43 GMT

I reworked this code and tested it against Stable 32.

Re: LabView code for Allan Variance?

Subliminal — Mon, 17 Mar 2008 19:43:13 GMT

Here's some pictures of the VI's.

Re: LabView code for Allan Variance?

Subliminal — Mon, 17 Mar 2008 20:47:56 GMT

Re: LabView code for Allan Variance?

GerdW — Tue, 18 Mar 2008 09:05:12 GMT

Hi Subliminal,

you should really clean up your code before uploading

I just changed 2 of those vis (allan-variance-dynamic.vi and calc_allan-variance.vi), the rest is up to you! (removing sequences, especially the stacked ones!; removing unneeded for loops, unneeded operations like deleting twice the first element, replacing constant math operations by constants - even when LV8+ is optimizing them anyway)

Re: LabView code for Allan Variance?

HansjoergScherer — Tue, 18 Mar 2008 10:54:22 GMT

Hy folks,

here is an update (LV 7.1) of the Allan-Statistics.llb.
The top level VI is "Allan_Plots.VI" - it calculates, displays and safes the Allan variance/deviation plots of time-domain data series.
The algorithm is according to Th. Witt, IEEE Trans. Instr. Meas. 50, 445 (2001).
[Definition of Allan variance: Allan variance is one half of the mean-square of the differences of successive averages of the input array Elements of the input array are time-averaged data.]

Hope it is useful for you!

H. Scherer

Re: LabView code for Allan Variance?

GerdW — Tue, 18 Mar 2008 11:08:06 GMT

Hallo Hansjoerg,

can you save a llb with block diagrams enabled?

Re: LabView code for Allan Variance?

HansjoergScherer — Wed, 19 Mar 2008 15:21:47 GMT

Sorry, here is the "Allan-Statistics_V2_LV711.llb" again, now with diagrams enabled.
The top level VI is "Allan_Plots.VI" - it calculates, displays and safes the Allan variance/deviation plots of time-domain data series.
The algorithm is according to Th. Witt, IEEE Trans. Instr. Meas. 50, 445 (2001).
Definition of Allan variance: Allan variance is one half of the mean-square of the differences of successive averages of the input array Elements of the input array are time-averaged data.

Hansjörg

Re: LabView code for Allan Variance?

HansjoergScherer — Wed, 19 Mar 2008 15:22:25 GMT

Re: LabView code for Allan Variance?

HansjoergScherer — Wed, 19 Mar 2008 15:50:54 GMT

Sorry, after having uploaded a LV llb as attachment to this forum, I have some remarks and hope that some moderator might read this:

First, I find it awkward to use a forum for exchange of code, as it seems to be usuable now. Earlier, there used to be a web library for all sorts of LV code (not only the instruments driver library, as you find it now at the right hand side of the Developer Zone web page). At the beginning of this thread the (former) path to that Development Library was given:
NI Home > NI Developer Zone > Development Library > Measurement and Automation Software > LabVIEW > Development System > Fundamentals > Graphs and Charts
or (URL):
Am I right that this Development Library really are no more accessible via links??
(Direct access is still possible if you know the path, for example for the Allan Viariance llb via "http://sine.ni.com/devzone/cda/epd/p/id/502")

Second, regarding the "ease of use" of this forum, I found that when you want to post message and use the preview option, unfortunately any attachment is lost...
Maybe somebody can care about that.

Regards,
Hansjörg

Re: LabView code for Allan Variance?

GerdW — Wed, 19 Mar 2008 16:28:13 GMT

Hi Hansjörg,

there now is a "Code Sharing" part of the developer zone - maybe you can upload your llb there too...

Re: LabView code for Allan Variance?

HansjoergScherer — Wed, 19 Mar 2008 16:46:10 GMT

Hi GerdW,

thanks for answring - it seems that at NI Developer Zone > I have only the choice to upload under the categories
"Example", "Tutorial", or "Textbook..."
None of these seems to fit in my case, so where to upload my llb to?

Hansjörg

Re: LabView code for Allan Variance?

ky3orr — Mon, 13 Sep 2010 10:27:18 GMT

Hi folks,

is there any possibility to create Allan llb to run under LV8.6.1?

I am working with atomic clocks stability measurements and would like to check how it is done with computations.

for any help thanks a lot.

greg

Re: LabView code for Allan Variance?

GerdW — Mon, 13 Sep 2010 10:48:57 GMT

Hi greg,

did you try that llb? The name suggests it's created with LV7.1 - so you could easily mass-compile it for your LV8.6

Re: LabView code for Allan Variance?

ky3orr — Mon, 13 Sep 2010 18:15:04 GMT

Hello GerdW,

i haven't tried yet.

I managed to run that llb, but i don't know yet how to include it in my project.

Do i need to extract somehow vi's from that llb or link it to my project?

thanks for help

greg