Follow-up: as several time-nuts noted, there was a lot of corrosion on
parts of the lamp module. Oddly, there was no corrosion on the rest of the
PRS10, or on the TS2500 which it came out of. The resistor lead was
severely oxidized and partly melted. It's possible that the inductance of
the wire-w
ns in a small
enclosure is the most probably reason to that failure. Also, in picture it
can be seen clearly many spots with electrochemical corrosion.
- Original Message -
From: "Arthur Dent"
To:
Sent: Tuesday, May 10, 2016 1:06 AM
Subject: [time-nuts] PRS10 rubid
On Mon, 9 May 2016 15:47:06 -0700
Stewart Cobb wrote:
> A half-melted bit of wire fell
> away before I could take the picture. Without that heater working, the
> lamp is apparently too cold to start.
This looks more like it corroded away than melted.
Though, it's a bit hard to judge with that
..."apparently got hot enough to create a localized thermal runaway in
its lead wire."
I don't think that explanation is correct. There are no signs of
discoloration
caused by overheating anywhere else in the photo and yet the lead wire
has apparently melted as you say. That would probably require
Hi,
I had the same problem a few years ago. What kind of advice are your
searching for to that "usual" failure?
Regards,
VS
- Original Message -
From: "Stewart Cobb"
To:
Sent: Monday, May 09, 2016 11:47 PM
Subject: [time-nuts] PRS10 rubidium lamp module fai
R901, on the far right, is shown on the schematic as "air heater". It
apparently got hot enough to create a localized thermal runaway in its lead
wire. There was ample evidence of arcing. A half-melted bit of wire fell
away before I could take the picture. Without that heater working, the
lamp is
