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.
___
time-nuts mailing list -- time-nuts@lists.febo.com
To
Fellow time-nuts,
For those of you that follow the news, you might have heard about the
redefinition of the kilogram. In fact, it's a wider redefinition which
also includes the second among other things.
The Draft Resolution A "On the revision of the International System of
units (SI)" is found
Hi
Ovenized MEMS oscillators have been around for quite a while. They go back at
at least a decade and likely quite a bit further.
Bob
> On Nov 16, 2018, at 12:03 PM, Chris Caudle wrote:
>
> I did not see any mention of this on the list. Could be interesting in
> some contexts:
>
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
Have you seen the new THS3491 ? LMH6702 on steroids.
This one begs to be designed into new distribution amplifiers:
Everything from DC / 1pps to a few 100 MHz into 50 Ohms, without any
changes.
(the usual gain = 2, 50R/50R out design)
rise / fall 1.3 ns for 10V step
slew rate 8V / ns
Scott:
Here are the analog output values I am seeing:
ad0 0.005 Spare
ad1 2.316 +24 Volt Heater Supply
ad2 2.327 +24 Volt Electronics Supply
ad3 0.491 Lamp Drain Voltage
ad4 0.343 Lamp Gate Voltage
ad5 2.402 Crystal Heater Control
ad6 2.358 Cell Heater Control
ad7 1.557 Lamp Heater Control
ad8
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
I downloaded and installed a new copy from the Leapsecond site.
Found the COM port for the Serial to USB Adapter (COM 5) and
voila ... it works.
I bought two Trimble T-Bolts from an auction site for short money
($80 ea) and wanted to check them out.
The last time I got some T-Bolts was a while
The small HP knobs are 0.050" (50 thou). Get good quality ones or they will
damage the screws.
I once found sone marked 1.27mm. The company found a random key that fitted a
part they bought in, measured it in metric and ordered 50 custom keys in that
size!
Robert G8RPI.
> On 16 November 2018
I did not see any mention of this on the list. Could be interesting in
some contexts:
https://www.sitime.com/company/news/press-release/sitime-launches-emerald-platform-game-changing-mems-timing-solution-5g
An oven controlled MEMS oscillator. I saw a sample recently, the idea
seems to be to
Lady heather, of course...
On Fri, Nov 16, 2018 at 10:23 AM Richard Solomon wrote:
> I downloaded a copy of TBOLTMON and installed it. When
> I try to open it I get a Com Port Error Message no matter
> which port I try (#1 through #16).
> The computer has a Windows XP O/S.
>
> I also tried it
I checked the TBoltmon files at http://leapsecond.com/pages/tbolt/ and they're
fine.
Grab a new copy if you suspect something wrong on your end.
The usual reason that you get a com port error is that the port doesn't exist,
or that it's beyond com16.
Does this old computer have native com ports
Dave:
If I were you, I would buy a set of inch (as opposed to Metric) hex
wrenches, that at least go down to 0.050 inch as the smallest.
You can get a very nice set for about 10 Pounds.
--- Graham
==
On Fri, Nov 16, 2018 at 8:21 AM Dr. David Kirkby <
drkir...@kirkbymicrowave.co.uk> wrote:
> I
I have a few HP 5370B time-interval counters of various states of cosmetic
and electrical condition. I wish to swap some knobs between the
instruments, as some are in better condition than others. Can anyone tell
me what size of hex key these are? I wish to order a hex key, but
obviously, want one
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