Re: [time-nuts] Lady Heather Question
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 ___ 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. ___ 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.
[time-nuts] Lady Heather Question
When you are viewing a time interval that is longer than one second per screen pixel, the program must sub-sample the data. Every second the screen is redrawn with a new set of samples. Also the plots are rescaled according to the data being plotted (if auto-scaling is turned on). With very noisy data, like the raw oscillator plot, you see the effects of what amounts to a new data set every second. Turning on display filtering (F D command) helps smooth out the changes (but can hide very short disturbances). ___ 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.
Re: [time-nuts] Lady Heather Question
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 ___ 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.
Re: [time-nuts] Lady Heather Question
I suspected that the graph issues might be involved with some display resolution issues. So then if a spike appears and disappears at some point in time, does that mean that in the original data there was a combination of spike and no-spike data and the sub-sampling first picks one and then the other? But does that mean that the standard deviation values are calculated from the sub-sampled values rather than the original data? Thanks, Ed Mark Sims wrote: When you are viewing a time interval that is longer than one second per screen pixel, the program must sub-sample the data. Every second the screen is redrawn with a new set of samples. Also the plots are rescaled according to the data being plotted (if auto-scaling is turned on). With very noisy data, like the raw oscillator plot, you see the effects of what amounts to a new data set every second. Turning on display filtering (F D command) helps smooth out the changes (but can hide very short disturbances). ___ 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. ___ 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.
[time-nuts] Sold
The device I listed yesterday has been sold. Thanks to the half-dozen or so folks who responded very quickly. I was gratified by the offers I received. Bill ___ 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.
Re: [time-nuts] Lady Heather Question
Assuming the vertical scale doesn't change, there should be no change to a particular trace as it scrolls across the screen, even if there is more than one sample per pixel. That's where a peak detect plotting algorithm helps out. Imagine an ink pen plot of some signals then stand back about 10 feet -instead of the individual points you would just see bands almost like bar graphs. So when plotting to a screen with a finite resolution, for each horizontal pixel location, there are two pixels plotted in the vertical axis with the pixels in between filled in. -Bob On May 2, 2011, at 11:38 AM, Ed Palmer ed_pal...@sasktel.net wrote: I suspected that the graph issues might be involved with some display resolution issues. So then if a spike appears and disappears at some point in time, does that mean that in the original data there was a combination of spike and no-spike data and the sub-sampling first picks one and then the other? But does that mean that the standard deviation values are calculated from the sub-sampled values rather than the original data? Thanks, Ed Mark Sims wrote: When you are viewing a time interval that is longer than one second per screen pixel, the program must sub-sample the data. Every second the screen is redrawn with a new set of samples. Also the plots are rescaled according to the data being plotted (if auto-scaling is turned on). With very noisy data, like the raw oscillator plot, you see the effects of what amounts to a new data set every second. Turning on display filtering (F D command) helps smooth out the changes (but can hide very short disturbances). ___ 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. ___ 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. ___ 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.
[time-nuts] Lady Heather Question
If your plot area is 1200 pixels wide and you are displaying 1 hour of data (3600 seconds) then the data from every third second is shown on the screen. The plot area is updated every second. If your spike event is one second wide it would appear on the screen once every three seconds. The plot statistics are calculated over the points actually shown on the screen. If the filter is turned on, the filtered values are used. Note that the filter works by calculating the average of the next N consecutive points in the queue. Generally there is very little difference in the statistic values calculated over the displayed points versus all the points covered by the displayed time interval... but it makes the program run quite a bit faster when long time intervals are shown. ___ 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.
[time-nuts] Wanted: Vincotech/Tyco A1035-D GPS Module
All, I am looking for one (maybe two) of a Vincotech (formerly Tyco) A1035-D GPS module. These used to be sold by Mouser, but no longer since Vincotech has gotten out of the GPS business. If you have any (in like-new condition) that are excess to your needs, please contact me off-list with the particulars. Thanks for the bandwidth! .73, Brent, KD0GLS, Minneapolis ___ 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.
Re: [time-nuts] Lady Heather Question
Thanks Mark! Now I understand. I see that you can reduce the jitter in the graph by changing the screen resolution using the $ command (e.g. changing from medium to large) so that you have more pixels on the screen. You can now reduce the filtering to help preserve short duration spikes and still have a stable graph and sdv values. Ed Mark Sims wrote: If your plot area is 1200 pixels wide and you are displaying 1 hour of data (3600 seconds) then the data from every third second is shown on the screen. The plot area is updated every second. If your spike event is one second wide it would appear on the screen once every three seconds. The plot statistics are calculated over the points actually shown on the screen. If the filter is turned on, the filtered values are used. Note that the filter works by calculating the average of the next N consecutive points in the queue. Generally there is very little difference in the statistic values calculated over the displayed points versus all the points covered by the displayed time interval... but it makes the program run quite a bit faster when long time intervals are shown. ___ 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. ___ 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.
[time-nuts] Jupiter 31
Has anyone done any experimenting with the Jupiter 31 gps receiver ? I see them on Ebay and was wondering. Thank You Kiss-Electronics Ms Ashley Hall 183 N 5th Avenue Cornelius, Oregon 97113 W7DUZ www.kiss-electronics.com ___ 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.
[time-nuts] Lady Heather Question
You can also stop a lot of the jumping around of plots by disabling the auto-scaling of that plot (or all of them). You can also disable the auto-centering. The default is to rescale and re-center the plots each time the screen is updated. A short spike can cause the screen to rescale as it is sampled onto/off the screen. ___ 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.
