would that have shown up in a firmware version id change?
try *IDN? and see if there is any correlation Matthew.
Le 30/08/2010 03:23, paul swed a écrit :
I seem to remember a rollover about then that obsoleted older gps units.
On Sun, Aug 29, 2010 at 5:40 PM, Matthew Kaufman<matt...@matthew.at> wrote:
I believe I've found a difference between the faulty units and the working
units... The faulty ones come up as 1/1/1997 when you do :SYSTEM:PRESET, the
good ones come up as 1/1/1998. Does this difference ring any bells for
anyone?
Matthew Kaufman
On 6/24/2010 8:41 AM, Matthew Kaufman wrote:
I now have *two* Z3801A units which misbehave in the following way (which
this thread reminded me of):
The GPS status says it acquires quite a few (5-6) satellites with high
signal strength... then after a minute or two, for no apparent reason, it
loses *all* of them simultaneously but immediately goes back into
"acquiring" for the ones it was seeing, and a few seconds later, they're all
back. During this time, survey (if in progress) is halted and then restarts
and runs for a bit before halting again when it loses everything briefly
again. Then, within days, the unit ends up out of lock... if I go check it,
I see it doing the same thing, and when the satellites are being received it
is in "fine frequency adjust" mode, but so far off the 1pps phase that it
really has no hope of re-locking before the next time it drops and then
reacquires all the satellites.
This is independent of antenna, location, and 48v power source... one unit
apparently has been this way since I got it, the other worked fine for
months and then developed this problem.
Without knowing more, I'm thinking it might simply be a bad GPS receiver
board, thus the idea of trying to find a replacement, perhaps one that is
better at staying acquired, has crossed my mind.
Matthew Kaufman
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