[time-nuts] ADEV query Timelab and TICC
GandalfG8 at aol.com
GandalfG8 at aol.com
Sun Mar 19 16:08:31 UTC 2017
Yesterday I used one of John's excellent TICC modules for the first time
and initially set up a quick test using the 10MHz output from a Thunderbolt
as the frequency reference to measure the 1PPS from an Oscilloquartz Star4
GPSDO, with the TICC output feeding a USB3 port on a Windows 10 PC running
the 64 bit version of Timelab 1.29.
I'll attach a copy of the test plots I'm referring to but just in case
this doesn't get through I've also uploaded it to....
https://www.mediafire.com/?9bue90yp1e8ueu6
Using the basic settings as described in the TICC manual the first run was
for 1 hour and seemed fine so I decided to extend the run time to 6 hours.
The first 6 hour test started to follow the 1 hour plot as expected and I
watched this on and off and can confirm it did so up to somewhere between
the 100s and 1000s points on the x-axis, but some time after that the
complete plot shifted upwards and then continued to completion to produce the
magenta trace.
I wasn't watching when it shifted so don't know if it was a jump or a
gradual shift but did see it continue until completion. When I repeated the 6
hour test, again without changing anything, and hoping to observe the effect
as it happened, it produced the green trace which was what I'd been
expecting to start with. Since then I've made other test runs and again all seems
to be as expected.
I'm probably missing something obvious but don't understand what's
happened here so any suggestions would be welcome.
Throughout the tests I have been simultaneously streaming data from the
Star4 to Lady Heather via a "proper" serial port on the same PC so did wonder
if there might be some form of data conflict but it doesn't seem to have
shown up as any obvious form of corruption and hasn't repeated itself.
Nigel, GM8PZR
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