On 10/02/2014 09:21 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
On 2 Oct 2014 07:10, Magnus Danielson mag...@rubidium.dyndns.org wrote:
David,
The character of starting high/low and then stabilize some 5-30 min later
is typical of oven oscillators. Underdamped ovens have been seen
Tim,
The shape does not look exactly what I would expect from a less than
critical damped oven, it looks a little to peaky, but maybe it is the
resolution of the graph that fools my eye.
Agree that you end up in critical damped oven with fast warmup requirement.
Cheers,
Magnus
On
On 4 October 2014 07:57, Magnus Danielson mag...@rubidium.dyndns.org wrote:
This answers my original curiosity now - did I have an OCXO or TCXO.
With that curve it is definitely an OCXO, and my guess is that it is an
SC-cut, which matches starting +40 ppm high (if I recall things correctly).
, 2014 3:38 AM
Subject: Re: [time-nuts] Measurement of frequency of HP 8720D option 1D5
oscillator after switch on
On 4 October 2014 08:01, Magnus Danielson mag...@rubidium.dyndns.org wrote:
Tim,
The shape does not look exactly what I would expect from a less than
critical damped oven, it looks
On 4 October 2014 13:24, Tom Van Baak t...@leapsecond.com wrote:
Dave,
Hi Tom
Thanks for the raw data. Attached is my plot. Your data looks ok to me.
Great
If you're interested here are some random comments about your
8720D-1D5-oscillator-frequency.csv file:
Sure
- Thanks for including
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Dr. David
Kirkby (Kirkby Microwave Ltd)
...
If I recall correctly, when I did look some time ago at getting
another TI counter, the Agilent 53230A seemed to have some
specifications *worst* than the
On 4 October 2014 23:03, John Miles j...@miles.io wrote:
I just stuck an offer on a SRS 620, which is sold as seen. I'll take a
chance it works if my offer is accepted.
The 5370B is still the only high-performance counter that I own, personally.
SR620s are fine as far as they go,
Is it me,
Out of curiosity, what's the difference between the two first traces?
One looks more jump than the other.
Cheers,
Magnus
On 10/05/2014 12:03 AM, John Miles wrote:
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Dr. David
Kirkby (Kirkby Microwave
Dave,
On 10/05/2014 12:13 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
On 4 October 2014 23:03, John Miles j...@miles.io wrote:
I just stuck an offer on a SRS 620, which is sold as seen. I'll take a
chance it works if my offer is accepted.
The 5370B is still the only high-performance
Hi
Both the 5370 and the 620 are getting a bit old. They both run (relatively)
hot. Each has their own reliability issues. The 5370 was the more common of the
two. Finding parts for it will be easier long term than a 620. Keeping either
one fully up to spec long term is likely to be a bit
Out of curiosity, what's the difference between the two first traces?
One looks more jump than the other.
These are all factory new OCXOs (in this case, they're TimePod spare parts
undergoing incoming test before I put them on the shelf). The 1303-series
parts both exhibited a small jump at
Hi
I’m not sure *what* goes wrong with the SR-620’s. I do know that I have a
couple of them that have problems. Maybe I’m just very good at killing test
gear …. One day I’ll sit down and dig through the pile.
Bob
On Oct 4, 2014, at 8:39 PM, John Miles j...@miles.io wrote:
Out of
David,
The character of starting high/low and then stabilize some 5-30 min
later is typical of oven oscillators. Underdamped ovens have been seen
before, I have even seen one on the brink of oscillation.
TCXO will not have the same wide range, as it compensate for the
temperature.
Cheers,
On 2 Oct 2014 07:10, Magnus Danielson mag...@rubidium.dyndns.org wrote:
David,
The character of starting high/low and then stabilize some 5-30 min later
is typical of oven oscillators. Underdamped ovens have been seen before, I
have even seen one on the brink of oscillation.
Thank you. Do you
The overshoot behavior from 150 to 220 seconds is exactly what you expect
for slightly less than critical damping which is where many closed loops
end up when rapid lock or warmup is a criteria. Most rapid warmup is almost
always the design point of an OCXO oven.
Tim N3QE
On Thu, Oct 2, 2014 at
As to oscillation: most older octal style crystal ovens have no
proportional control at all, they are simply a bimetallic
click-on-click-off thermostatic switch that is on or off, and after initial
warmup they cycle up and down every few minutes.
A tiny fraction of the better octal crystal ovens
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