[volt-nuts] Eppley Thermopile

[J. L. Trantham]

Well, according to my digital caliper, the 'shank' measures 0.498 inches or 
12.62 mm.

My caliper has not been calibrated.

The 'business end' of the unit has a 'slit' shaped opening, about 18.88 mm 
high and about 2.65 mm wide with a 'V' shaped area in the vertical 
direction.  That 2.65 mm opening looks to be adjustable with two screws that 
allow the sides to be moved in or out.  I have not been (and will not be) 
adjusting it.  There appears to be a glass covering over the thermopiles.

Perhaps, in a coming decade, I will find a use for it.

Joe


----- Original Message ----- 
From: "J. Forster" <jfor at quikus.com>
To: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
Sent: Wednesday, September 21, 2011 10:47 PM
Subject: Re: [volt-nuts] Eppley Thermopile


>> John is correct.  The mount is, indeed, a Spindler & Hoyer Gottingen,
> made in Germany.
>
> Note that the in is likely 13.7 mm OD...  not 1/2" as you might expect.
> Ealing made compatible stuff.
>
> I also think he is correct about what the 'thing' is.
>>
>> Measuring the voltage from the unit with the 7081 with aluminium tape 
>> over
>> the front, I get pretty close to 0.0 uV.  With the tape removed and the
>> lights on in the shop, I get about 2 uV.  With a small, three AAA battery
>> powered, LED flashlight illuminating it from close range, I get about 280
>> uV.
>
> Be careful. The disk and thermopiles are very delicate. Don't even be
> tempted to even blow on them.
>
>> I am not sure what I will ever use it for but it is 'on the shelf'.
>
> They are very useful in an optics lab, and are essentially transfer
> standards between optical power and voltage.
>
> -John
>
> ================
>>
>> Thanks,
>>
>> Joe
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