Thanks John and Magnus.
The reason I asked was that when I check the noise floor of my one and
only 5370, the result is noticably superior using the external clock.
Since the signal is coming from a single source fed through a MC ZFSC-2
splitter and unequal lengths of co-ax, variability in the signal source
should have no effect. When I measure the 5370 with an external clock I
see 2.24E-11 at t0=1s with a straight -1 slope; with the internal clock
I see 4.43e-11 with periodic noise at about 11, 22, .... seconds. This
suggests to me that the internal oscillator is not so hot.
Having only one 5065 I want to use it to both clock the 5370 and serve
as the reference; hence the question. It seems to me by applying the
DUT to the start channel one avoids the issue of hitting the same range
of start values, assuming some phase change relative to the DUT.
Bob Darby
On 10/11/2013 5:36 PM, Magnus Danielson wrote:
It can be a benefit or a cause of problem. In one end, it could lower
your noise. The DG535 actually has that as a recommendation, that the
signal source and the DG535 operate on the same clock.
Another aspect is that you keep banging the same little range of values,
and that may for that time-base to stop delay be systematically off in
an unfavourable fashion. The noise of a counter is not always linear
with that delay, so an asynchronous clock would sweep over the range.
Then again, if the delay is just right you can utilize the minimum.
Cheers,
Magnus
On 10/09/2013 11:42 PM, John Miles wrote:
Not sure if there's anything to worry about, but I don't think there are any
good reasons to do it. The OCXO in the 5370 is an order of magnitude more
stable from one second to the next than the counter's resolution would allow
you to measure at t0=1s.
-- john, KE5FX
Miles Design LLC
-----Original Message-----
From: [email protected] [mailto:time-nuts-
[email protected]] On Behalf Of Robert Darby
Sent: Wednesday, October 09, 2013 12:30 PM
To: [email protected]
Subject: [time-nuts] Question concerning ADEV measurements
Is there a methodological difficulty using the reference clock to also
clock a TIC?
Specifically, I have a 5370B with the DUT on the start input and a 5065A
on both the stop input and the external clock input.
Thanks,
Bob Darby
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