On Sun, 05 Dec 2010 16:47:22 -0800, Peter Bennett
wrote:

On Sun, 05 Dec 2010 20:16:21 +0100, Lucas wrote:

On Sun, 05 Dec 2010 12:25:07 -0600, John Fields
wrote:

On Sun, 05 Dec 2010 18:52:04 +0100, Lucas wrote:

hallo
I have a double oven OCXO (type MV89A , Marion (C-max)) -
10 MC , power supply = 12 V -current is 350 a 400 mA

Is it normal that the temperature of the outside housing, is SO hot
that it is hardly can holding in the hand
(measurement = + 60 ° Celsius) ?
the room temperature is +/- 23 °C

---
+/- 23C about what?

---
JF


JF,
23 °Celsius is the room temperature where the is OCXO is in test,
for the moment the OCXO is not build in a box ,
the normal temperature in the house is +/- 23 degrees Celsius, there
is the OCXO in test

Lucas

If you mean that the ambient temperature is about 23 C, say "about 23
C", or "~23 C", or "23 C +/- 5". Saying +/-23 C implies that the
temperature varies from -23 C to +23 C.

According to the datasheet, the MV89A stability specs hold for ambient
temperatures of 0 to 55 C. This implies to me that the internal oven
temperature is somewhat above 55 C - otherwise the thing could not
regulate the crystal temperature. Therefore, your 60 degree reading
is not unreasonable.


Yes, you probalty right...

but I wonder : if anyone has an D-OCXO MV89A ,
so he can confirm if is OK ,
because the other OCXO oven is less warmer in the same room
temperature