Just as an aside, you /can /get rid of the 'dithering digit' problem if
you use a counter which employs a reciprocal counting technique.
I use a Thandar Thirlby TF830 locked to a 10MHz reference derived from a
Tbolt, but I'm sure there must be others.
David Bobbett, G4IRQ
On 24/11/2011 18:01, Robin Kimberley wrote:
Any frequency counter will have an given accuracy +/- the LSD (least
significant digit), so alternating between 10.0000000 and 9.9999999 looks
perfectly normal to me.
Rob Kimberley
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Frederick Bray
Sent: 24 November 2011 17:56
To: time-nuts@febo.com
Subject: [time-nuts] Differences / Jitter Between Frequency Standard Sources
I have what would probably be considered to be a "newbie" question, so
please excuse my likely ignorance.
I have a HP 5385A frequency counter, which I am using with an external
standard. If I try to compare one 10 MHz standard against another, using
one as the external standard and the other as the device being measured, the
readout fluctuates between 10.0000000 and 9.9999999. This happens when I am
comparing a Z3801A and the Trimble look-a-like using the same GPS antenna
and identical cables (including length) between the GPS antenna splitter and
the two units. I have also used identical
cables between the 10 MHz outputs and the counters. Hence, cable
variations shouldn't be the issue.
The same thing happens comparing the Timesource 2700 against either of the
GPS standards.
Is this attributable to the different standards or the frequency counter? I
haven't yet set up a dual trace scope to compare the various sources
directly, but that will be my next step.
Thanks for any comments, etc.
Fred Bray
W6WAW
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