Do you think that the oven is working correctly? Is the DC current high
on power-up then dropping to a steady lower value after warm-up time?
My concern is that the resistors may have unsoldered themselves because
the oven ran away into an over-temp condition.
On 3/12/2013 9:55 AM, Garren Davis wrote:
Bob,
Took your advice and ordered another OCXO. While waiting for it I decided to
cut open the
OCXO with a bad heater that came with the thunderbolt. I found the 1 ohm
resistor from the
12 volt pin to the heater circuit popped off its solder pads and was laying
between the
insulation and the metal enclosure. While unsoldering the circuit board to fix
this the
1 ohm resistor in the oscillator circuit popped off its solder pads. For others
that have
OCXO's that don't work this is an easy fix. They are large surface mount
resistors and easy
to solder. Anyways I put the circuit board back in the metal enclosure but did
not seal
it. I put the OCXO back in my double oven and started a run. The enclosed
picture is a 72
hour display. Even though the DAC was still increasing it looked like the PPS
had stabilized
so I did an auto calibrate. You can see this at marker 1. That was almost two
days ago.
Questions:
1. Is it normal to take this long for the PPS to stabilize?
2. Is it normal for the DAC to keep increasing after two days?
3. In general what numbers would be considered good for the PPS and OSC?
Thanks.
Garren
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