[time-nuts] TimeLab and the N cornered hat...?

[Nick Sayer via time-nuts]

I’m running the latest beta, and I’ve found the spot in Edit > Trace details 
where you tell it the two sources that contribute to a particular dataset. I’d 
expect that having done that and loaded two traces A-B and B-C that I’d be able 
to elect to show the N cornered hat and see something different in the ADEV 
window, but it’s not doing anything. What am I missing?
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Re: [time-nuts] TimeLab and the N cornered hat...?

[John Miles]

If you're only loading two files, that's definitely not going to work since a 
3-cornered hat requires 3 plots.  In your example, there must be a third plot 
representing A-C, so that each of the three sources will contribute to two 
different plots.  

Apart from that, check for mismatched file parameters.  The way it's currently 
set up, all of the following conditions have to be met before Trace->Show 
separated variances (Ctrl-h) will work:

- A deviation measurement must be selected (ADEV, MDEV, TDEV, HDEV)
- Overlay mode must be enabled with Display->Overlay (o)
- At least three plots must be loaded
- All participating plots need to have visibility turned on (Display->Toggle 
visibility (v))
- All participating plots must have valid Source A and Source B labels
- The source labels must be spelled consistently between all of the 
participating plots
- All participating plots need to have trace history set to 1 (Edit->Trace 
properties (e)->Trace History)
- All participating plots need to have been acquired with the same xDEV bin 
density
- All participating plots need to have exactly the same sample interval (tau 
zero)

The last condition is especially easy to miss if your plots came from a counter 
with "Use incoming data to configure measurement" checked.  It may have 
measured the sampling interval a bit differently in one or more of the plots. 

If you've already checked these points and it still isn't rendering the hat 
traces, zip up the .tim files and send them to john (at) miles.io, and I'll 
have a look.

-- john, KE5FX
Miles Design LLC


> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Nick Sayer
> via time-nuts
> Sent: Sunday, September 27, 2015 8:25 AM
> To: Discussion of precise time and frequency measurement
> Subject: [time-nuts] TimeLab and the N cornered hat...?
> 
> I’m running the latest beta, and I’ve found the spot in Edit > Trace details 
> where
> you tell it the two sources that contribute to a particular dataset. I’d 
> expect that
> having done that and loaded two traces A-B and B-C that I’d be able to elect 
> to
> show the N cornered hat and see something different in the ADEV window, but
> it’s not doing anything. What am I missing?
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-
> nuts
> and follow the instructions there.

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Re: [time-nuts] TimeLab and the N cornered hat...?

[Nick Sayer via time-nuts]

> On Sep 27, 2015, at 5:06 PM, John Miles  wrote:
> 
> If you're only loading two files, that's definitely not going to work since a 
> 3-cornered hat requires 3 plots.  In your example, there must be a third plot 
> representing A-C, so that each of the three sources will contribute to two 
> different plots.  

Ok, well, that’s definitely what I missed. I faked it loading one of the files 
twice and labeling as you said - ab, ac and bc and it worked. Now to actually 
collect the correct data. Thanks!
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