Hi,
As I'm inclined pop my head up and throw my opinion in here...
Since the internal clock (ring oscillator) is essentially free running
in the TDC7200 it really has a 55ps +/- xxx ps resolution. That is to
say, it may be 55ns, or 55.001ns, or 54.999ns resolution. It's possible
those extra digits may actually give meaningful data, so I'm inclined to
suggest leaving the digits in there.
In any case, this discussion regarding the TICC/TDC7200 resolution and
calibration process is probably helpful to many. I've picked up a few
details in the last day or so.
Dan
On 1/10/2019 12:00 PM, time-nuts-requ...@lists.febo.com wrote:
Date: Thu, 10 Jan 2019 07:54:20 -0500
From: "John Ackermann. N8UR"<j...@febo.com>
To: Discussion of precise time and frequency measurement
<time-nuts@lists.febo.com>
Subject: Re: [time-nuts] Misuse of word "decimate" (was Re: Short term
10MHz source)
Message-ID:<29bb671d-83d4-4375-8f4c-0bad25ecb...@febo.com>
Content-Type: text/plain; charset=UTF-8
And just to clarify the subject matter -- the TICC data output contains 12
decimal places, i.e., 1 ps precision.? The actual resolution is about 55 ps, so
the last digit is pure noise, and the penultimate digit should really be either
5 or 0.?
To eliminate the distraction of the noise, It's under consideration to zero the
last decimal place, and*maybe* to round to 50 ps.? I think the last digit is a
no-brainer, but am more hesitant about the rounding.
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