Tom,
On 04/17/2013 07:21 AM, Tom Van Baak wrote:
Tom, you scare me some times, this is one of them... or the time actually.
Magnus,
I remember why I didn't measure the M12 oscillators directly -- it's a real
challenge to get at the signal on the back side of the PCB and to measure it
without loading the crystal. It's not like just connecting a wire to a 50R
Timepod input. Here are photos of the oscillator on three different versions of
the M12 board:
http://leapsecond.com/pages/m12/m12-osc.htm
Perhaps with some 'scope tracing you can find a buffered clock output on one of
the ASIC pins. That way the same probing technique could be used on all 3
boards.
OK, now you start to make sense ;-)
Only #2 should be a challenge, as #1 and #3 has buffered output. Still,
you want some buffering. A suitable CMOS gate should pull it off.
Otherwise a FET-probe to a PSU and then into the TimePod should do the
trick.
Cheers,
Magnus
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