correct !
In a message dated 9/17/2017 1:51:30 P.M. Eastern Daylight Time,
cjaysh...@gmail.com writes:
Yes.
An instrument with a calibration certificate is not necessarily accurate
but it's inaccuracies are known and can be compensated for (but only to the
accuracy of the calibration refe
good point
In a message dated 9/17/2017 2:01:01 P.M. Eastern Daylight Time,
jim...@earthlink.net writes:
On 9/17/17 9:42 AM, KA2WEU--- via time-nuts wrote:
> Simply call it " Make it to meet specification", N1UL
>
>
> In a message dated 9/17/2017 12:39:32 P.M. Eastern Daylight Tim
On 9/17/17 9:42 AM, KA2WEU--- via time-nuts wrote:
Simply call it " Make it to meet specification", N1UL
In a message dated 9/17/2017 12:39:32 P.M. Eastern Daylight Time,
mag...@rubidium.dyndns.org writes:
Hi,
The word "calibration" is overloaded with multiple meanings, and
incompatible
Yes.
An instrument with a calibration certificate is not necessarily accurate
but it's inaccuracies are known and can be compensated for (but only to the
accuracy of the calibration reference of course.)
On 17 Sep 2017 17:39, "Magnus Danielson" wrote:
> Hi,
>
> The word "calibration" is overl
Simply call it " Make it to meet specification", N1UL
In a message dated 9/17/2017 12:39:32 P.M. Eastern Daylight Time,
mag...@rubidium.dyndns.org writes:
Hi,
The word "calibration" is overloaded with multiple meanings, and
incompatible too.
"calibration" is often used to describe adjus
Hi,
The word "calibration" is overloaded with multiple meanings, and
incompatible too.
"calibration" is often used to describe adjustments to make a device
operate correctly, such as passing the performance checks.
"calibration" in legal traceability is about measure the performance
agains
As to the point most modern instruments have self calibration, Most of the
time 'calibration' is simply the performance check adjustments are not
performed unless necessary
The difference being the instruments used in performance test are traceable to
a national standards body.
So whats ref
And if the performance is not validated, then they fix it.. I hope.
I do a lot of phase noise measurements , spectrum analysis and power
measurements and S/N ratio measurements so I need correct tool .
In a message dated 9/17/2017 11:23:31 A.M. Eastern Daylight Time,
scmcgr...@gma
Modern test and radio equipment have self calibration capabilities, older
analog do not. Calibration is not always need for just simple test, but
for specification conformation it is useful. A bit of luck also helps.
In a message dated 9/17/2017 8:08:00 A.M. Eastern Daylight Time,
On 15 Sep 2017 10:45, "Scott McGrath" wrote:
>
> Precisely my point, But when purchasing i expect to pay for a
calibration at a minimum.
I have on occasions requested sellers to send an item to the manufacturer
(Agilent or Keysight) for calibration *before* shipping it to me, offering
to pay th
I do enjoy the 'chase' of repairing things other people have discarded as
beyond economic repair, my CMU200 came with a rather amusing fault as well
as a good example of poor industrial design choice, it's now a very useful
piece of equipment.
I often scrounge faulty electronic equipment just for
I almost always buy equipment that isn't working. It's fixing it that makes
it interesting. What would I do with all the testgear if I didn't use it to
fix the next bit ?
On Fri, Sep 15, 2017 at 9:34 AM, Michael Prescott MSc <
mike_presc...@hotmail.com> wrote:
> I second Clint’s statement, most
I second Clint’s statement, most of the test equipment I’ve brought have worked
on switch on. I did buy a R&S CRTU with no LCD display and paid £400 for
something which didn’t work I had a lot of deep thoughts. It turns out CRTU
was only nine years old and two months out of calibration, the iss
Precisely my point, But when purchasing i expect to pay for a calibration at
a minimum.
Helps to make friends with the local cal lab though as frequently far better
pricing can be negotiated if you can get your instruments done on a
non-critical basis as most of the business of a lab is t
Experience has shown me that you can reasonably purchase good, working test
equipment that's well within calibration tolerances if you are buying the
more 'common' equipment, 6.5 digit meters, frequency counters, even a
Stanford SR620...
I've been very lucky with those, two spectrum analysers and
Its an unrealistic expectation that equipment from the well known auction site
will work and be 'in-cal'
Its realistic to anticipate several the purchase cost to get well priced
instruments back 'in-cal'. But hey if i spend 2 k on a sweeper 3 k to fix and
cal it and BlahTest is charging 10k fo
To all:
I would highly recommend not to buy used test equipment on e-bay , mine
(R&S) or HP or similar.
These pieces are mostly out of calibration , defective , just too expensive
to repair. I have 3 XSRM systems, which I co designed in 1970, they came
from e-bay and needed $ 5000 + to be
On 9/12/2017 5:58 AM, GandalfG8--- via time-nuts wrote:
A friend of mine has bought a just out of calibration R & S XSRM Rubidium
standard from one of the so called "recyclers" on Ebay.
Nigel / David,
Sorry to hear of your "bargain". However I doubt very much that the
lamp was made by R&S
As the Rb has run for 3 days the light is brightening. Its gained .4 volts
and is at 7.7vdc.
So thats a very good sign I was concerned it might ramp down as it does when
first turned on.
I think several things could be done on the next one that starts to fail.
Check the oscillator components. Why w
Maybe get a1980s strobe light and some fiber and pipe it in.
If you read through the thread though indeed the heat gun at 300 degrees did
recover the rb lamp nicely and I am burning it in for several weeks to see
if it stays lit or decays.
On Wed, Feb 16, 2011 at 2:27 PM, Oz-in-DFW wrote:
> And
And cold fluorescent tubes. I can often get my attic fluorescents to
start with a bright flashlight applied close to an end.
On 1/22/2011 5:05 PM, Bob Camp wrote:
> Hi
>
> Neon bulbs do the same thing. The ignition voltage is light sensitive. If you
> see a place they are being used as a voltag
Ordered a small heat gun today. Has 2 temperatures and I am sure the low is
going to be more then enough. I plan to mount the RB lamp upside down so the
heat from the gun goes upward. The operating temperature normally is about
177 degrees F. So will add in a K thermocouple to monitor temp and then
Hello to the group.
Well I did bring the RB oven online and indeed the color went from the blue
to the purple/pinkish color when the oven stabilized at 170-177 degress.
Thats what I see it moving around at.
John I agree it doesn't seem to matter what the frequency is. Though my
oscillators is still
>
> On 01/22/2011 11:31 PM, paul swed wrote:
> > Well pretty interesting late afternoon.
> > The oscillator works but C-11 definitely is troubled. Additionally a key
> > element is an effective ground. Bridge the low side of the ampule to a
> > better ground and the oscillator seems to reliably st
Hello to the group.
Indeed I did try the light several times and it does seem to ignite the RB.
But not always.
So thats an area to look at. I seemed to remember neon bulbs could be
triggered. I suppose thats was why I did it for the heck of it.
However Magnus has confirmed that my little silver b
On 01/22/2011 11:31 PM, paul swed wrote:
Well pretty interesting late afternoon.
The oscillator works but C-11 definitely is troubled. Additionally a key
element is an effective ground. Bridge the low side of the ampule to a
better ground and the oscillator seems to reliably start. Ignition occur
Hi
Neon bulbs do the same thing. The ignition voltage is light sensitive. If you
see a place they are being used as a voltage reference, they get painted black.
Bob
On Jan 22, 2011, at 6:02 PM, WB6BNQ wrote:
> Paul,
>
> The LED thing is interesting. Are you sure you were not just seeing a
Paul,
The LED thing is interesting. Are you sure you were not just seeing a
reflection
of some sort ?
BillWB6BNQ
paul swed wrote:
> Other thing, measuring ignition time. On the first run just for the heck of
> it I flashed a led light into the ampule and it ignited instantly. So
> perhaps
Well pretty interesting late afternoon.
The oscillator works but C-11 definitely is troubled. Additionally a key
element is an effective ground. Bridge the low side of the ampule to a
better ground and the oscillator seems to reliably start. Ignition occurs
when the oscillator is in the 80-85 MC ra
On 01/22/2011 07:03 PM, paul swed wrote:
Interesting
Took the oscillator board apart last night and found C11 has a cold solder
joint.
That explains it.
Its the variable cap that tunes the heater. Have not re-soldered it
yet as I am having trouble getting enough heat in the area even with a
s
Interesting
Took the oscillator board apart last night and found C11 has a cold solder
joint. Its the variable cap that tunes the heater. Have not re-soldered it
yet as I am having trouble getting enough heat in the area even with a
soldering gun to tack the cap back on to the housing.
Fortunately
On 01/22/2011 04:19 AM, paul swed wrote:
Actually there is a paper by Arthur Molenkamp (Spelling wrong) thats quite
detailed and he seems to have done the same thing I am. You do not need the
heater to start the RB lamp.
I have found 2 things this evening on the FRS-c.
The oscillator is intermit
Actually there is a paper by Arthur Molenkamp (Spelling wrong) thats quite
detailed and he seems to have done the same thing I am. You do not need the
heater to start the RB lamp.
I have found 2 things this evening on the FRS-c.
The oscillator is intermittent and I might guess its the variable tun
I bought one just yesterday on eBay for $58 USD shipped from China to
replace one I broke. I did some surgery to change the behavior of the lock
lamp (I wanted it to light when locked, not when unlocked). A week later I
went to document what I did for the list members and walked across the
carpet,
Exactly my thinking they are very cheap. Well heck they are very old. I
guess thats why.
So I am really unconcerned about whats next. Its a great learning exercise
my interest and I am taking pixs as I go along. There had been pixs on the
web but the links seem broken for the FRS C.
I realized as
Hi
I would not do anything that's not reversible. You may well come across a FRS-C
that's got a good lamp and dead electronics.
Of course given what telco Rb's cost these days
Bob
On Jan 20, 2011, at 10:47 PM, paul swed wrote:
> Well I think bad news.
> I have a frs c apart. Unfortunate
Well I think bad news.
I have a frs c apart. Unfortunately the rb lamp doesn't even light at all. I
have been getting RF at about 80.5 Mhz though at the moment I am not. I do
not see any residue on the bulb.
On one of the websites I did see that the lamp should run outside of the
oven. Granted not
Magnus Danielson wrote:
On 12/01/11 18:41, paul swed wrote:
Did you use a large heat gun or the smaller ones for heat shrink.
I might guess the smaller one
I have a smaller one so that was what I used and it was more than
sufficient. I will get a large one too, but with some propper effect
c
On 12/01/11 18:41, paul swed wrote:
Did you use a large heat gun or the smaller ones for heat shrink.
I might guess the smaller one
I have a smaller one so that was what I used and it was more than
sufficient. I will get a large one too, but with some propper effect
control.
Cheers,
Magnus
Did you use a large heat gun or the smaller ones for heat shrink.
I might guess the smaller one
Thanks
On Tue, Jan 11, 2011 at 2:29 PM, Magnus Danielson <
mag...@rubidium.dyndns.org> wrote:
> Paul,
>
>
> On 11/01/11 19:57, paul swed wrote:
>
>> Crazier question could it be baked in an oven or mus
On 11/01/11 06:43, Chris Erickson wrote:
Would someone mind posting the manual for this? I have a dead one in the
closet that needs my attention and I'm not quite sure where to start. The
power supply works, but no other signs of life.
I was just given this by a fellow time-nut:
http://rubidiu
Paul,
On 11/01/11 19:57, paul swed wrote:
Crazier question could it be baked in an oven or must you be able to
carefully visually watch it?
I guess you could do that if you only can oriented it there. However, I
just wanted to play a bit safe and not overheat it... and then I did
warm it up
Crazier question could it be baked in an oven or must you be able to
carefully visually watch it?
On Tue, Jan 11, 2011 at 1:53 PM, paul swed wrote:
> Magnus
> Crazy question. Though the small rb references are difficult to disassemble
> they can be. I believe I have seen what you describe. Might
Magnus
Crazy question. Though the small rb references are difficult to disassemble
they can be. I believe I have seen what you describe. Might this technique
be used on those also. I have a flaky end of life old telco reference that I
would open up to try it on. Though no heat gun.
Does the RB real
Chris,
On 11/01/11 06:43, Chris Erickson wrote:
Would someone mind posting the manual for this? I have a dead one in the
closet that needs my attention and I'm not quite sure where to start. The
power supply works, but no other signs of life.
When I get around to scan it I will put it on my we
Would someone mind posting the manual for this? I have a dead one in the
closet that needs my attention and I'm not quite sure where to start. The
power supply works, but no other signs of life.
Thanks,
Chris Erickson
___
time-nuts mailing list --
On 09/01/11 18:44, cdel...@juno.com wrote:
This link shows the light from a rubidium spectral lamp.
Its appearance is quite similar to the rubidium lamps used in various
rubidium standards.
There can be a slight bluish cast also, especially at low temperatures as
the lamp warms up.
I'm not fam
On 09/01/11 12:12, Magnus Danielson wrote:
On 09/01/11 11:20, Bruce Griffiths wrote:
Magnus Danielson wrote:
On 09/01/11 05:17, paul swed wrote:
Lamp is orange purple
Thanks, this is what I recall but never bothered to check myself.
Where is that box of gas-lamps to help identify alkali met
On 09/01/11 11:20, Bruce Griffiths wrote:
Magnus Danielson wrote:
On 09/01/11 05:17, paul swed wrote:
Lamp is orange purple
Thanks, this is what I recall but never bothered to check myself.
Where is that box of gas-lamps to help identify alkali metals?
Cheers,
Magnus
Use your spectrometer
Magnus Danielson wrote:
On 09/01/11 05:17, paul swed wrote:
Lamp is orange purple
Thanks, this is what I recall but never bothered to check myself.
Where is that box of gas-lamps to help identify alkali metals?
Cheers,
Magnus
Use your spectrometer.
Spectrum should be similar to that attach
On 09/01/11 05:17, paul swed wrote:
Lamp is orange purple
Thanks, this is what I recall but never bothered to check myself.
Where is that box of gas-lamps to help identify alkali metals?
Cheers,
Magnus
___
time-nuts mailing list -- time-nuts@febo.c
On 09/01/11 03:56, Magnus Danielson wrote:
Hi!
My R&S XSRM Rubidium is having problems. It behaves as there is no light
from the lamp, and I can't see any light from it, but I let it warm up
again. The manual doesn't give clear indication on how one should
observe light, but it seems like there
Lamp is orange purple
On Sat, Jan 8, 2011 at 9:56 PM, Magnus Danielson wrote:
> Hi!
>
> My R&S XSRM Rubidium is having problems. It behaves as there is no light
> from the lamp, and I can't see any light from it, but I let it warm up
> again. The manual doesn't give clear indication on how one s
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