[time-nuts] How do I know my GPS stabilized oscillatoris working?
SAIDJACK at aol.com
SAIDJACK at aol.com
Sat Aug 12 21:03:34 EDT 2006
Hi Ulrich,
I've been using your plotter tool for a while now, and Congrats! It's quite
good, I was very impressed. It's a wonderfull tool.
Here are some suggestions that came out of every-day real life experience,
and may help to make it even better:
* It would be good to have the tool normalize the vertical axix for every
column when showing more than one column superimposed. It does this if you
only view a single column, but if you show two or more with different scales
(say frequency accuracy and temperature versus time) the tool doesen't create
multiple scales to fit the two data columns inside the same window.
* There are so many options to choose from that sometimes it is a bit
hard to find what one is looking for. For example, if I want to change the
vertical scale from scientific notation to scalar notation to see more than two
digits of resolution, I have to go quite deep into the Axis menu. It would be
great if the axis could be clicked, and the scale changed similar to how Excel
does it.
* Once zoomed-in, it would be nice to have a zoom-out feature. I figured
out how to do it with the right mouse button and selecting from right to left
on the window, but maybe there is a way to just click somewhere to zoom out
again to see all data?
* On the Allan deviation table shown next to the plot, I think the tool
goes up only to show up to 4098 (?) s worth of data, even if data worth 100000
seconds has been captured and is shown on the plot. A couple more entries
in the table would be nice: maybe at time intervalls where a major vertical
decimal is broken (say for example 15500s if at that point the measure is
exactly 1.0E-014, then 102300s if it reaches 1.0E-015 at that point etc)
* My HP 5334B counter, when set to A-B time mode will sometimes generate
negative time measurements (for example -6ns, -13ns etc), but then for some
reason measure across one second so it jumps to +999999993ns etc. Don't know
why the 5334B firmware does this. The effect is that the Plotter tool gets
jammed by the large difference in the two scales. I cannot filter the larger
values out with the "delete outlier" button. Could this be added so the tool can
recognize this issue and handle it correctly?
* While drift can be removed, could you also add a feature that shows the
least-mean-square fit (average line or something similar) through a
drifting, noisy plot?
* Could you please add a help button to explain the many features
(buttons) of the tool?
* Is there a way to select colors for columns? One of the traces I have is
always white on the plot, and it's very hard to see on the screen, as well
as almost impossible to printout onto paper.
* An "oscilloscope" type marker tool would be great, where you drag a
vertical line right and left with the mouse across the plot, and you have a
readout of the vertical value of the selected column data at that exact point.
* It seems that the Allan Deviation etc. is always calculated over the
entire data set (is that true?), even if you zoom into a small portion of the
dataset. It would be great to only do the stability math on the data that's
actually visible on the screen (or even better: choose from the two options:
math over full dataset, or selected subset).
Hope not to have rambled too much; again this is a great tool!
Thanks for sharing it,
bye,
Said
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