I think I figured out the problem. When I rebuilt the lamp assembly, the R901 air heater resistor was listed as a 750ohm 2W on the
schematic so that's what I installed. I just measured the old resistor, which had a broken lead, and it is 534ohms. I sort of
repaired the broken lead and
The case temperature derived from the ADC reading does not match actual
measured values. The PRS10 data sheet says it is roughly the temperature
midway between the baseplate and lamp temps.
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I placed a large fan in front of the heat sink and it only cooled it down to 69C according to the case temp sensor. There's no way
the case is actually anywhere close to that temp, it's maybe 40C with that fan running. I'll replace the LM45C and see what happens.
Scott
On 11/16/18
My PRS-10 (a telecom version) runs with a heatsink temp of around 55C of
a bit less. But some areas of the case actually run a few deg hotter than
that.
Dana
On Fri, Nov 16, 2018 at 3:49 PM Mark Sims wrote:
> My case temp runs around 70C with the SRS heatsink installed. If you
> don't have
@lists.febo.com
Cc: Scott Mace
Subject: [time-nuts] PRS10 case temperature
I have been experimenting with a PRS10 and using Lady Heather to collect data.
This unit had several failed components in the lamp assembly, which I replaced
and the unit locks well now. One thing I noticed is that on cold
My case temp runs around 70C with the SRS heatsink installed. If you don't
have a heatsink (a rather bad idea) it might run 80C. The latest SRS heatsinks
don't seem to be as good as the earlier units which had a lot more metal to
them... my heatsink is the later model.
I have been experimenting with a PRS10 and using Lady Heather to collect data. This unit had several failed components in the lamp
assembly, which I replaced and the unit locks well now. One thing I noticed is that on cold startup, the unit seems to think it's
already at 40-50C, when in
