John,
Thanks for the good news! I foresee a late evening with plenty of time
with the trimmers. Is the lock-range mentioned in the HP-manual?
Happy new year to everyone!
--
Björn
On Sat, December 30, 2006 0:51, John Miles said:
There is probably nothing wrong with it. Two things to
I don't believe it's mentioned anywhere in the 5345A manual, but I'd guess
it's in the 10811A manual. Of course, the counter may not take advantage of
the entire available EFC control-voltage range.
-- john, KE5FX
John,
Thanks for the good news! I foresee a late evening with plenty of time
Just like with wine, making good crystals involves a lot of knowledge
and a little bit of magic...
Happy new year!
Didier KO4BB
Bill Hawkins wrote:
Brooke,
I foresee a discussion similar to those of wine connoisseurs.
What is the maison and vintage of the crystal? Was it
found on the
I just picked up a 5345A from eBay. This unit has a 10811 oscillator instead of
the 10544 depicted in the manuals I have. The serial number has been removed.
Does anyone know if there is an EFC adjustment for this counter or is the
course control the only way of setting frequency?
Colin
The 5345A does not have a EFC adjustment, so your only option is the
frequency adjust pot on top side of the 10811 oscillator.
Greg
- Original Message -
From: Colin Bradley [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Friday, December 29, 2006 11:01 AM
Subject: [time-nuts] HP 5345A
I
John Miles wrote:
There's no manual fine-tuning adjustment on the 10811A, which is something
I've always found strange. The trimmer that is present is arguably far
too
coarse. I've owned 10811As that would stay put within a couple parts in
1E-10 per year, but setting them to that degree of
Colin Bradley wrote:
I just picked up a 5345A from eBay. This unit has a 10811 oscillator
instead of the 10544 depicted in the manuals I have. The serial number has
been removed. Does anyone know if there is an EFC adjustment for this
counter or is the course control the only way of setting
and frequency measurement
time-nuts@febo.com
Cc: time-nuts@febo.com
Sent: Friday, December 29, 2006 8:04 PM
Subject: Re: [time-nuts] HP 5345A
Colin Bradley wrote:
I just picked up a 5345A from eBay. This unit has a 10811 oscillator
instead of the 10544 depicted in the manuals I have
Cc: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 5345A
John Miles wrote:
There's no manual fine-tuning adjustment on the 10811A, which
is something
I've always found strange. The trimmer that is present is arguably far
too
coarse. I've owned
Boxes such as the 105A/B (and others) use the EFC as a fine manual frequency
adjustment.
For boxes without EFC manual adjustment, it's possible to set the 10811 to
3E-10 or better if you're careful and willing to go through a few iterations
over a few days. At time of performance check (of boxes
John Miles wrote:
No; per year. The 10811(D?) in a late-model 8662A I owned a few years ago
was a serious outlier. If I remember correctly, it was about 3E-10 off
after being left on for a year. I'll never find the notes I kept on it
now,
but it was definitely better than 1E-9.
It
It probably wandered around much more than that during the year and
you just happened to measure it when it was close to the starting
point. Kind of like the broken clock that keeps perfect time every 12
hours. In any event, I can safely say, having looked at thousands of
10811's, that I
with.
-- john, KE5FX
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Hal Murray
Sent: Friday, December 29, 2006 1:29 PM
To: [EMAIL PROTECTED]; Discussion of precise time and frequency
measurement
Subject: Re: [time-nuts] HP 5345A
It probably wandered
Hal Murray wrote:
I thought aging was generally uni-directional and reasonably predictable
if
you had enough data.
Does it wander in both directions?
This is probably on the list of the 10 greatest myths about
crystal oscillators. Many decades ago, there were systematic
aging effects such
In message [EMAIL PROTECTED], Rick
Karlquist writes:
Hal Murray wrote:
I thought aging was generally uni-directional and reasonably predictable
if
you had enough data.
Does it wander in both directions?
Yes, see for instance:
http://phk.freebsd.dk/misc/drift.png
--
Poul-Henning
What's the Y-axis on that graph? Parts in 1E-9?
-- john, KE5FX
Yes, see for instance:
http://phk.freebsd.dk/misc/drift.png
___
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
In looking at the manual for the 5334A/B, the oscillator support board has a
trimmer (R5) that could be used for EFC control of the 10811A. Too bad that HP
did not use EFC (or an internal FINE control) to set frequency on this great
unit in more of there instruments
Colin
In message [EMAIL PROTECTED], John Miles writes:
What's the Y-axis on that graph? Parts in 1E-9?
Yes. n for nano.
It's an ISOTEMP OCXO 131
Yes, see for instance:
http://phk.freebsd.dk/misc/drift.png
___
time-nuts mailing list
From: Rick Karlquist [EMAIL PROTECTED]
Subject: Re: [time-nuts] HP 5345A
Date: Fri, 29 Dec 2006 14:39:09 -0800 (PST)
Message-ID: [EMAIL PROTECTED]
Hal Murray wrote:
I thought aging was generally uni-directional and reasonably predictable
if
you had enough data.
Does it wander in both
Hi Rick:
Is there a way to know about the type of aging up front. For example
what crystal makers have only micro cracks as the aging mechanism? For
what starting date? My guess is that there are plenty of crystals that
have aging that's mainly due to contamination or other causes that the
They probably assumed that most hardcore users would lock the counter or
generator to a house standard anyway. (You might point out that only
hardcore users would have paid $15,000+ for a 5345A, but the practically-new
one that I just bought was owned by the New Jersey State Police!)
It's
On Fri, December 29, 2006 19:01, Colin Bradley said:
I just picked up a 5345A from eBay. This unit has a 10811 oscillator
instead of the 10544 depicted in the manuals I have. The serial number has
been removed. Does anyone know if there is an EFC adjustment for this
counter or is the course
measurement
Subject: Re: [time-nuts] HP 5345A
On Fri, December 29, 2006 19:01, Colin Bradley said:
I just picked up a 5345A from eBay. This unit has a 10811 oscillator
instead of the 10544 depicted in the manuals I have. The serial
number has
been removed. Does anyone know if there is an EFC
: Re: [time-nuts] HP 5345A
Hi Rick:
Is there a way to know about the type of aging up front. For example
what crystal makers have only micro cracks as the aging mechanism? For
what starting date? My guess is that there are plenty of crystals that
have aging that's mainly due to contamination
I got a HP 5345A off eBay, and it is in mint condition. I took the top off
and no dust on the inside or anything, I could hardly believe it.
However, when I went to hookup a signal to the input... Nothing! All the
internal self-tests passed, but those bypass the front inputs. I looked
through the
I thought about that (getting a parts unit), but to be honest I'm no repair
expert and would probably end up doing more damage than good. Another list
member contacted me with some info about what he thought could be wrong, and
I ended up selling it to him since he was interested in it and thinks
through the manual for some hint of a fuse or something, but could not
find
anything. I also pulled the front display off to check the PCB that the
BNC
inputs go into and everything looked okay on them too.
Does anyone know if there is a hidden fuse somewhere that I should check?
Also is there
27 matches
Mail list logo
