Moin,
I'm sending this anwer to time-nuts as well (with permission of Taka)
as this might be generally interesting.
On Sat, 9 Mar 2019 04:23:27 + (UTC)
Taka Kamiya wrote:
> I am experiencing what you are talking about "live".
> I have an experimental setup where PRS-10 is being steered by
Hi
Ok, if you are concerned about 1 us and not to concerned about 100 ns, then
there’s not
a lot to set up. A standard that is good to 10 ns / s will do just fine. That’s
10 ppb and a
“typical” OCXO in a counter will do just fine. Leave it on for a few days and
set it to frequency.
There
This seems like as good of a message to reply to as any. Thanks to
everyone who has replied so far - lots of good information, which is
right in the category of what I was looking for.
Let me clarify what I'm hoping to measure. I apologize if some of
the terminology below is wrong, I'm still
We have operated about 40 PRS10s over the past 20 years or so. These are
all run continuously in benign environments and monitored via GPS
time-transfer . Some have died after just over a year; others have operated
for more than 12 years. A new one generally takes a few months to burn in,
before
> A PRS10 with a long shelf life will need more than 10 months (not days !) to
> get its final drift. Its dépends of the homogeneity of the gas mixture
> (Rb85,87 and krypton) in the cell and a long non running time affects the
> mixture.
What's going on there?
Why/how does the mixture change?
: [time-nuts] PRS-10 Warm-up Time, Calibrating/Adjusting, and
long-term poweron
To: "Discussion of precise time and frequency measurement"
Date: Friday, March 8, 2019, 4:45 PM
On Fri, 8 Mar 2019 06:31:48
-0600
Dana Whitlow
wrote:
> The point here
is that there are appare
今日は
On Fri, 8 Mar 2019 14:09:20 + (UTC)
Taka Kamiya via time-nuts wrote:
> Why? Because nature of GPSDO and Rb, time constant is set to 2 to 3 hours.
> (still experimenting) It takes few cycles of this to lock and stabilize. In
> short, you'll be safe if you wait 24 to 48 hours. Rb
On Fri, 8 Mar 2019 06:31:48 -0600
Dana Whitlow wrote:
> The point here is that there are apparently a number of warm up drift
> mechanisms operating, some of which take days to sensibly settle down.
Longer. I know of one measurement, where the Rb had a kind of stable
drift until it suddenly
Hi
> On Mar 8, 2019, at 7:47 AM, Attila Kinali wrote:
>
> On Fri, 8 Mar 2019 01:18:45 -0700
> "Forrest Christian (List Account)" wrote:
>
>> 1) Assuming the PRS-10 has been off for a long time, how long should I
>> plan on leaving this on for the 10Mhz to stabilize? I see the
>> longest
I am experimenting with exactly the same thing. PRS-10 with Thunderbolt.
PRS-10 takes about a day to stabilize. When physics lock happens, it has
limited stability - which is mentioned in manual. Before I calibrated, I
waited for 2 days. These movements are visible if you feed GPSDO into
Keep in mind that the 7 min "warmup time" of the PRS-10 is jut the time for
the
unit to get the physics package close enough to final temperature for the
dithering
loop to lock to the atomic transition. But based on measurements of current
drawn
by the oven(s), it takes more like an hour for the
On Fri, 8 Mar 2019 01:18:45 -0700
"Forrest Christian (List Account)" wrote:
> 1) Assuming the PRS-10 has been off for a long time, how long should I
> plan on leaving this on for the 10Mhz to stabilize? I see the
> longest warmup time on the spec-sheet is 7 minutes - although this
> seems a
> 1) Assuming the PRS-10 has been off for a long time, how long should I plan
> on leaving this on for the 10Mhz to stabilize? I see the longest warmup
> time on the spec-sheet is 7 minutes - although this seems a lot shorter than
> I'd likely use in real life, I'm also not sure if there's
13 matches
Mail list logo
