This thread is for the topic of hp and atomic clocks.
Time-nuts is not about wristwatches or radium dials, or Rolex or tritium or
Waltham, ...
Please take your off-topic tangents elsewhere (there are many wristwatch forums
on the internet).
/tvb
Moderator, http://leapsecond.com/time-nuts.htm
Steve Allen wrote:
> I remember my mom's wind-up travel clock glowing brightly. 50 years
> later there is nothing. I brought it into the lab just to check that
> it is still radioactive (wouldn't want to have lost that radium
> somewhere). It's the zinc sulfide crystals, the radiation damages
>
On Mon, Jan 07, 2019 at 02:21:07PM -0500, Bob Bownes wrote:
> Interesting. I was wondering this as well now that time-nuts has gotten me
> into collecting vintage (pre WWII) chronographs. Some are radium, some not,
> most are in need of a good repaint either way.
You might try
Interesting. I was wondering this as well now that time-nuts has gotten me
into collecting vintage (pre WWII) chronographs. Some are radium, some not,
most are in need of a good repaint either way.
But I do know that tritium gun sights are also a thing. Are those all
mil-surplus or using some
On Fri, Jan 4, 2019 at 6:59 PM Steve Allen wrote:
> On Fri 2019-01-04T17:05:21-0500 paul swed hath writ:
> > Ed agree with your coment that a 30 or greater year old led may be
> dimming.
>
> Not nearly as much as an entirely different clock illumination:
> radium watch dial paint
I remember my
his.
Jim
From: time-nuts on behalf of Steve Allen
Sent: Friday, January 4, 2019 6:57:51 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Atomic Clocks: It is important that they keep good
time, Part 1
On Fri 2019-01-04T17:05:21-0500 paul swed
On 5/1/19 6:45 am, paul swed wrote:
> Yes indeed I also would like one of the analog clocks. But be careful what
> you ask for
> I have a friend in Switzerland that does have a 5065 with the analog clock.
> It tends to drive you a bit crazy with the tick of the step so he says. I
> may believe
Lady Heather does have an audible "tick" clock mode. It ticks on the second
and beeps on the minute. The ticks and beeps are fairly well synchronized to
true time.
You can also set the clock name displayed on the analog clock display... Mine
is usually set to Patek-Philippe.
On Fri 2019-01-04T17:05:21-0500 paul swed hath writ:
> Ed agree with your coment that a 30 or greater year old led may be dimming.
Not nearly as much as an entirely different clock illumination:
radium watch dial paint
I remember my mom's wind-up travel clock glowing brightly. 50 years
later
Yes Paul, LEDs wear out over time. By the late 70s and into the 80s, I
think they were improved and perfected to the point where wearout is
very slow and barely noticeable visually, and efficiency is much higher
compared to the oldies. Even opto-couplers are sometimes specified for
LED
Bob
Yes indeed click, click, click.
Ed agree with your coment that a 30 or greater year old led may be dimming.
I expect better from HP. Not really.
With respect to the clock it did run off the 24 volt battery and the
display shut down on power failure. There is a button on the front labeled
Add a tiny speaker so you can simulate the loud 'tick' of the analog clock.
;)
On Fri, Jan 4, 2019 at 4:29 PM ed breya wrote:
> Paul, what do you mean by the display "looking pretty ratty?" As I
> recall, the original buck regulator had regulated output voltage around
> 5V for the LEDs. and the
Paul, what do you mean by the display "looking pretty ratty?" As I
recall, the original buck regulator had regulated output voltage around
5V for the LEDs. and the PMOS clock IC needed something around 12V.
Whatever the LEDs run from, it should be regulated and well filtered. If
the LEDs are
Yes indeed I also would like one of the analog clocks. But be careful what
you ask for
I have a friend in Switzerland that does have a 5065 with the analog clock.
It tends to drive you a bit crazy with the tick of the step so he says. I
may believe that as I used impulse clocks for world time
On Fri, Jan 4, 2019 at 4:15 AM Rice, Hugh (IPH Writing Systems) <
hugh.r...@hp.com> wrote:
> The clock display on a HP Cesium Standard is a bit of a gimmick. The
> legend I was told: An Admiral was touring a nuclear submarine, and was
> being shown the "Atomic Clocks" in the navigation
That's an interesting story and history about the clocks. I happen to
have the original type digital one, used in a 5065A. I don't have an
actual 5065A, but many years ago acquired a carcass of one - it was
missing the Rb physics and a few other things, but was a nice box for
re-use.
I
> I once showed the CEO our brand new $100K cisco AGS+ router. It
> was kitted out to the hilt with ethernet interfaces, but the front
> side he saw had only the orange bridge siloutte and a single green
> power LED. He looked at it and then said "For that kind of money,
> couldn't they at least
In message , "Rice, Hugh (IPH Writing Systems)" writes:
>The clock display on a HP Cesium Standard is a bit of a gimmick.
>The legend I was told: An Admiral was touring a nuclear submarine,
>and was being shown the "Atomic Clocks" in the navigation section,
>and said: "If the Navy is
The clock display on a HP Cesium Standard is a bit of a gimmick. The legend I
was told: An Admiral was touring a nuclear submarine, and was being shown the
"Atomic Clocks" in the navigation section, and said: "If the Navy is going to
pay 40 grand for an atomic clock, I damn well better be
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