On Tue, 7 Dec 2010 16:26:35 +0100, "petrus bitbyter"
wrote:


"petrus bitbyter" schreef in bericht
ll.nl...

"Lucas" schreef in bericht
...
On Sun, 05 Dec 2010 19:16:59 -0600, John Fields
wrote:

On Sun, 05 Dec 2010 16:19:08 -0800, Rich Grise
wrote:

Lucas wrote:

I do not mean that the temperaturature fluctuate from -23C to +23C
degrees, NO , no ...... the temperture is 'about' 23 ° Celsiuis

Just FYI (for your information), if you mean it's 23C with a bit of
variation, the convention amongst American English speakers would
be "23 C, +/-" where the '+/-' is understood to mean "by not enough to
make that much difference."

The OCXO is in test, in these room tempearture ,
but the housing of the OCXO (type MV89A) in the room temp ( 23 C)
is about 60 C -- and ' very hot ' to hold in the hand....

Maybe it's supposed to be that way, and you're not supposed to hold it
in
your hand while it's in operation. It is an "oven" after all. What does
the
owner/operator manual say?

Another popular American colloquialism is, "When all else fails, read
the
instructions." ;-D

Cheers!
Rich
---
Isn't it, actually, "RTFM" ?

---
JF


Ok, yes I know 'RTFM'.....but I do not find anything about the
temperature of OCXO itself ....

or do you can give me a link with more specifications about the MV89 ?
I've already 'goole ' around,
I've an other 'double Oven XO' and this like to me, more realistic
for temperature of the outside housing ...I think about 40 C..

Lucas

So flipper pointed to the spec sheet already.

The spec. reads:
Current consumption at steady state @ 25C 80mA (12V version)

Did you measure the current after the warming up time? If that's 350mA or
more, you can be sure something's wrong. According to the spec the current
should be 300mA even during warming up.

Did you by chanche power a 5V type by a 12V supply?

petrus bitbyter



Sorry but I consulted a wrong datasheet. The right one reads:
Current consumption at steady state @ 25C 350mA
As the warmup time is 15min. the device may be ok with that 350mA current
after the 15min. When the current stays above that 350mA however there's
something wrong. (Which, of course, is obvious.)

petrus bitbyter



Yes indeed is's the MV89A ,
but'ordering nr is not conform the data sheet':
on the label :

OCXOMV89A XO00281M-CT-MV89
from Morion Inc - Saint petersburg

The power supply = 12V and stable from a professional power supply,
'power on' current is about 0.8 a 1 Amp , and decrease to 270 -
300 mA
stable about 330 mA at the room temperature in free air.
(the OCXO is not yet build in a housing (my intention s to use the
device as timebase for a HP 5326B counter) ,
The HP 5326 has the possibility to connect an external timebase
via BNC plug .

When I put something cold on the housing of OCXO (in free air) the
current increase to more then 500 mA, and the freq look stable (a
few 0.1 Hz for 10 Mhz source)

finaly the OCXO seems not so bad ...

I 'll try to get more information from Morion Inc.
maybe , it's normal ... ,
but I've an other 10 Mc , also 'double oven' and the temperature of
the housing is less (maybay ..30 a 40C)

Lucas