[time-nuts] Lady Heather's plotting functions
holrum at hotmail.com
Fri Sep 16 17:01:12 EDT 2016
Not just GPSDO's... now works with just about any GPS receiver, timing or otherwise (and with GPSD). Code is now pushing 60,000 lines.
From: Scott Stobbe <scott.j.stobbe at gmail.com>
Sent: Friday, September 16, 2016 6:27 PM
To: holrum at hotmail.com; petervince1952 at gmail.com; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lady Heather's plotting functions
The joys of a small display, why couldn't I see that. Many thanks Mark & Peter.
Soon to be the emac's of gpsdo's (in the good, can do anything sense) well done.
On Wed, Sep 14, 2016 at 12:27 AM, Mark Sims <holrum at hotmail.com<mailto:holrum at hotmail.com>> wrote:
You can set the view interval to any value with the "V" keyboard command (default is one second per pixel, 1 minute per horizontal division).
Above the plot area is a section that give the view interval in total time (60 minutes in those plots) and time per division (5 minutes per division). Lady Heather logs all the data in a circular buffer and when it fills, the oldest data is replaced by newer data). The default plot queue size is 3 days... the /q command line option for can change that (n.b. and error in the help screen says the default is 30 days).
Lady Heather decimates the queue data to fit the plot interval by skipping values. The F D keyboard sequence lets you apply an averaging filter to the displayed plot data. The value is the number of queue values to average.
You can scroll around the plot queue data from the keyboard (arrow keys, page up/down, home, end, etc) or with the mouse (left button hold at the center of the plot area, move the mouse to the left or right of center to scroll left or right, the farther the mouse is from the center of the plot, the faster it scrolls).
Normally Lady Heather scrolls the plot to the left automatically, but if you are reviewing plot data, the scrolling is suspended (press DEL to resume normal scrolling plot displays).
You can set/remove up to 10 markers with the = and - keys. To go to a marker, press it's number. You can jump to the next anomaly (like time stamp skips - show with a red tick at the top of the plot) with the % key.
Normally Lady Heather auto-scales and centers the plots (indicated by a '~' in the REF (center line value) and scale (units/div) values above the plots. You can set fixed reference and/or scale factors (indicated by an '=' in the REF and scale factor values via the G keyboard menus. There are also options for changing things like what statistics (AVG/RMS/MAX/MIN/SPAN, etc) to show, plot colors, etc) These can be changed globally for all plots or individually for each plot.
You can also have Lady Heather do an FFT of a given plot.
You can do a screen dump of just the plot area (W G command) or write an ascii log file of the shown plot area values (W P). The next version of Lady Heather also supports writing logs in XML, KML, or GPG file formats. You can also do automatic screen or log dumps on a periodic basis from the T keyboard menu or the command line.
> Pardon my lack of knowledge regarding Lady Heather, what is the x-axis
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