On 3/16/2016 4:47 PM, John Phillips wrote:
> You should use oil so that you do not get evaporative cooling.
Better still, but more potential to be messy. Another advantage is that
there's no need to waterproof the sensor. I was thinking along the lines
of sticking the wire through a small hole in
On 3/16/2016 3:19 PM, Joseph Gray wrote:
> I would like to shield
> the sensors from direct air currents due to AC and heating system.
Because that's not really making it colder or warmer? :-)
Sounds like you want a moving average, so you don't see the sudden
changes, even when they exist. Add so
On 7/27/2015 10:26 PM, Mike S wrote:
> On 7/27/2015 7:54 PM, Bill Gold wrote:
>> You will observe that the HP/Agilent/Keysight manual for the 3458A
>> does not give any "zero" stability specs, at least that I can find.
>
> On DC 100 mV range, the standard model
On 7/27/2015 7:54 PM, Bill Gold wrote:
> You will observe that the HP/Agilent/Keysight manual for the 3458A
> does not give any "zero" stability specs, at least that I can find.
On DC 100 mV range, the standard model is spec'd for 14+3 ppm of range @
2 years from calibration, not considering tempe
On 1/28/2015 9:00 AM, J. L. Trantham wrote:
In the days of 3D printers and CAD/CAM, it might be possible to have
a 'run' of these 'made to order', so to speak.
I'd think a couple of pieces of pink (non-conductive) closed cell
antistatic foam, one hollowed out a bit with a penknife, would work
On 10/8/2014 4:23 AM, acb...@gmx.de wrote:
the EPROMs are in sockets, no soldering needed.
but again, buying a precision instrument but reprogramming cal data that is
years old does not make any sense.
unless of course if you are just a collector and do not use its accuracy.
It makes perfect s
On 9/10/2014 7:00 PM, Tony wrote:
I've just noticed that TI and Linear's specs for 'Long Term Stability'
(typical) are different. TI state 20ppm/1000Hr while Linear state
8ppm/SQRT(kHr). That's a big difference - is this likely to be a real
difference or just specmanship?
I note that Linear (in
On 8/29/2014 2:16 PM, Tom Miller wrote:
Did you remove the two holes?
:)
You mean the two pin 1 markers on the silkscreen?
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After some more research, I think I've answered some of my own questions -
Tellurium copper is used for binding posts, not because it has any
special thermal or EMF mojo, but because it machines much better than
pure copper. And, I suppose, because it sounds like it's extra special.
The Seebe
On 8/25/2014 9:54 PM, Don@True-Cal wrote:
Why?
Let me count the ways.You can never count on any Seebeck voltage to
be immediately offset, there are far too many variables.
...
> A set of
5440A-7002 (banana plug) cables comes with this calibrator
(5440A-7003 spade lugs for 5720A)
For those le
On 8/25/2014 11:02 AM, Don@True-Cal wrote:
Silver or Gold plating on the terminal or wire will introduce the
undesirable dissimilar metal properties, both at the plating
junction and at the plating metal to DUT terminal.
Why?
Any Seebeck effect is immediately offset in the opposite direction,
On 2/26/2014 6:53 PM, J. L. Trantham wrote:
Oh!! THAT's what they mean by 'male' and 'female'. I get it! :^))
You jest, but it's not always clear. Take the common Cannon "D-sub"
connectors. A connector with male contacts will have have a female
shield, making gender ambiguous. That's
On 8/12/2013 2:23 PM, John Phillips wrote:
A calibration indicates that the unit under test is withing manufactures
specification. The equipment and procedure used has to be "good enough"
(bad words in a cal lab) to have a high probability (nothing is 100%) of
insuring the calibration documentati
On 8/12/2013 12:21 PM, Charles Steinmetz wrote:
No, you could not perform ANY traceable calibration with the 3458A
itself, much less with any instrument you had calibrated with the 3458A,
because *you* are not accredited
That's simply not true. Some organizations may require a lab to be
accred
These were used in the Fluke 332B (and others). Still used in the 732.
They seem to be unobtainium. Lots of hits on questionable Chinese sites.
It's easiest if I can find one for a reasonable price. Otherwise, I
suppose I'll have to re-do the board with an LM399.
--
Mike
_
On 1/28/2013 8:48 AM, Tony Holt wrote:
> Could the sense wires be welded to
> the ADC pins between the solder connection to the PCB and the package to
> avoid the thermal EMFs of a solder joint?
I don't think welding would make the difference, unless the wire is made
of the same material as the
On 9/14/2012 8:04 PM, Fred Schneider wrote:
> Is the heater from a LM399 regulated, so it stayes at 85 degrees or
> is it just drawing an vast amount of current like a lightbulb ? So if
> it gets hotter around the LM the heater temp stays the same ? ... > I
just building a refrence with it and If
Apropos: http://www.sciencedaily.com/releases/2012/07/120711101042.htm
With regard to the discussion, since in the SI, Amps are the base unit,
Volts are derived from Amps, and Ohms from Volts - remarkable that Amps
are the least realizable in practice? (I guess it's just the difference
between
On 7/11/2012 5:15 AM, Frank Stellmach wrote:
This is the worst realized electrical unit, i.e. the 'mise en pratique'
is difficult to an error level of about 1e-7 only.
On 7/11/2012 6:50 PM, Bob Smither wrote:
I may be off here, but I doubt that thermal (Johnson) noise would limit the
precision
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