Murray,
Having somewhat started this topic, I'd like to say thank you for this
interesting post. Indeed, I believe that it is probably possible to
gain some form of freq standard from the mains, although it would have
to be over a long term period and it does not appear that there is any
Hello all,
I'm playing around with an NTP server using a Blackfin processor and
uClinux, and a Oncore M12M-Timing. The board is our H8606,
http://www.hvsistemas.com/en/prod/H8606.html , with the standard crystal
oscillator replaced with a FOX924B TCXO,
http://www.foxonline.com/pdfs/fox924.pdf
Gentlemen,
up to now I have been thinking that I am pretty well informed about
current counter technology but some experiences of the last days make me
doubt. The following applies to frequency measurements of a 10 MHz
signal.
I have received some data measured with an Agilent 53131 counter from
Ulrich,
up to now I have been thinking that I am pretty well informed about
current counter technology but some experiences of the last days make me
doubt. The following applies to frequency measurements of a 10 MHz
signal.
I have received some data measured with an Agilent 53131 counter
On this latter point, let's say that a clock driven by the mains is
correct to within 10 seconds/day (about 1e-4), but in the longer term
accuracy is improved. To reach even 1ppm level, you need to accumulate
time for 100 days. What chance is there of accumulating for 100 days
without a power
Big question: If the single shot resolution is only 3-4 times better
that that of the 53131 and much inferior to the 20 ps of my SR620, how
does the 53132 manage to be THAT GOOD A PERFORMER? Magic? Black art?
Hi Ulrich,
My understanding is that 1) the 53132A has a single-shot
resolution of
Tom Van Baak wrote:
Hi Ulrich,
My understanding is that 1) the 53132A has a single-shot
resolution of about 150 ps, but also 2) it can do something like
200,000 phase measurement per second for CW RF inputs.
In frequency mode, the frequency computed and displayed
each second is the result
Hi Bruce:
The Ref Output on the front panel of the SR620 is derived (1/10,000) from the
EXT IN on the rear panel. So when you apply a 10 MHz signal to EXT IN you get
a 1 kHz REF OUT. Appendix B in the PSR10 Rubidium source manual describes how
to use this along with the arming function to
Hello all,
Would any of you happen to know where I can find a mating connector for the
Efratom FRS-C rubidium standard? I see one eBay ad via a Google search
listing it as a Cannon P/N DAM11WIS, but searches on the ITT/Cannon
website don't turn up any hits.Is this a valid part number?
Thank
Hi Bob:
I think you have almost the correct part.
The Stanford Research PRS10 uses the same connector, see:
http://www.prc68.com/I/PRS10.shtml
The ITT Cannon web page shows many stocking distys for it and the coax insert:
http://www.ittcannon.com/support/stockcheck_result.asp
Have Fun,
Brooke
The part number is 11W1S (one instead of letter i). Mouser has several
connectors with 11W1 contact arrangement, and surely that some are
adequate for the FRS-C. Try exploring this link:
High voltage power lines subject to lightning strikes have reclosing
breakers that allow the fault arc to extinguish before reclosing.
Last I knew (1968) the reclosing delay was 30 cycles or 1/2 second.
Since the breaker recloses into a system of thousands of generators,
there is no phase change,
- Forwarded Message
From: Brooke Clarke [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, 9 October, 2008 10:43:07 AM
Subject: Re: [time-nuts] What is the best counter for a Time Nuts?
Hi Bruce:
The Ref Output on the front
Brooke Clarke wrote:
Hi Bruce:
The Ref Output on the front panel of the SR620 is derived (1/10,000) from the
EXT IN on the rear panel. So when you apply a 10 MHz signal to EXT IN you
get
a 1 kHz REF OUT. Appendix B in the PSR10 Rubidium source manual describes
how
to use this along
Bruce Griffiths wrote:
Brooke Clarke wrote:
Hi Bruce:
The Ref Output on the front panel of the SR620 is derived (1/10,000) from
the
EXT IN on the rear panel. So when you apply a 10 MHz signal to EXT IN you
get
a 1 kHz REF OUT. Appendix B in the PSR10 Rubidium source manual
My SR620 fails to complete its Self Calibration Routine by showing Cal
Error 07. It won't proceed beyond that point, although at times it will
jump to Cal 13-16 programs. Cal Error 07 is listed as flagging hardware
problems in the Start TAC (Time to Amplitude Converters) which are the
cirsuits
My SR620 fails in its Self Calibration routine at Cal Error 07. The Users
Manual describes this error as a problem with the Start TAC (Time to
Amplitude Converters) and indicate that this flags a Hardware problem in the
circuits which perform the analog interpolation between the 90 MHz clock
Jim Robbins wrote:
My SR620 fails in its Self Calibration routine at Cal Error 07. The Users
Manual describes this error as a problem with the Start TAC (Time to
Amplitude Converters) and indicate that this flags a Hardware problem in the
circuits which perform the analog interpolation
Hi:
Recently the Datum 4065 has developed a major fault.
Cesium fault numbers 3 5.
Cs fault 3 is Zeman Pedestal 160 mv
Cs fault 5 is C-Field Current 20.0 ma
Status 3 menu sows the C-Field current at 20.2 ma.
Status 4 menu shows the C-Field Adjust at +1785 and it should be between -50
and +50.
Bruce Griffiths wrote:
Jim Robbins wrote:
My SR620 fails in its Self Calibration routine at Cal Error 07. The Users
Manual describes this error as a problem with the Start TAC (Time to
Amplitude Converters) and indicate that this flags a Hardware problem in the
circuits which perform
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