[time-nuts] Lady Heather Question
Ed Palmer
ed_palmer at sasktel.net
Mon May 2 16:27:05 UTC 2011
Warren,
Thanks for the info. I thought I'd been through all the menus, but I
missed the display filter. Very useful. Right now, some of the other
things you showed are lost due to temperature fluctuations in my
workshop. I have to get my Tbolt set up with the temperature control
system similar to yours.
Ed
WarrenS wrote:
> Sounds like you're missing much of what can be done with Lady Heather.
> (Which is understandable because the Doc is poor)
>
> The first thing you can do is set the display filter with FD100.
> See the attached LH screen dump for a few other useful time-nut things that can be done with LadyHeather.
>
> ws
>
> ******************
> Robert Watzlavick rocket at watzlavick.com
>
> I think the graph is not using peak detect for the plotting. I leave
> mine set at a 12-hour window and all the points are moving around every
> second. When plotting more data than will fit in the available
> resolution, it is best to "bin" the points that correspond to each plot
> bin/pixel. Then you can plot a bar (min/max) or a single point (mean)
> for that bin.
>
> -Bob
>
> On 05/02/2011 01:14 AM, Ed Palmer wrote:
>
>> I've been running Lady Heather for some months now. I've always been
>> puzzled by one characteristic of the graphs. If I use a view setting
>> of anything other than 1 sec. per division, the oscillator graph in
>> particular, 'runs wild'. Spikes appear and disappear. From second to
>> second the sdv value can swing up and down by 10 or 20 ppt or more.
>> The ADEV values reported by Lady Heather are stable at 1.x e-8 @ 1
>> sec. and 1.x e-12 @ 10K sec. through this. My ability to measure ADEV
>> at low Tau values is not great, but I'm getting numbers in the e-12
>> range for Tau = 1-10 seconds which suggests that the Osc isn't all
>> that bad.
>>
>> Lady Heather Version 3.0; Jan. 15 - 2011.
>> Autoscaling of the graphs is disabled.
>> Time Constant, Damping, & Gain are at default
>> Satellite constellation is stable. Right now it happens to be 5
>> satellites.
>>
>> What's going on?
>>
>> Thanks,
>> Ed
>>
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