[Boatanchors] tube tester readings

[Tom Norris]

At the T.o.s in our PMEL that measured high resistences and conductanct, were calibrated in Siemens, though sometimes the instrument itself simply said (conductance).  The Fluke 5700 series of instrument calibrators has a cal setting for s, but not for mho, IIRC.  Been 5 years, though.  

Tom Norris Nu4g


On Feb 24, 2010, at 10:38 AM, Clarke, Tom AIR4.0P NATOPS wrote:

> Wiki says mho is still commonly used in electronics.  Siemens is recognized as an SI internationally, however, as they state, "it may be confused with the manufacturer Siemens AG".  It is the formal definition.
> 
> Wiki is not necessarily authoritative. (!)
> 
> Some of my friends prefer mho and some of my friends prefer Siemens....I support my friends! 
> 
> Tom/W4OKW
> 
> 
> Tom Clarke
> Wyle, Inc  Aeronautics
> P3 Product Lead, PEO(A)
> USN/USMC National Airworthiness Office
> Naval Air Systems Command, AIR-4.0P
> (301) 995-3793/DSN 995-3793
> Fax: (301) 757-6599
> Cell (301) 904-2053
> frederic.clarke at navy.mil
> 
> In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. -Galileo Galilei, physicist and astronomer (1564-1642)
> 
> -----Original Message-----
> From: Price Smith [mailto:w0rihps at sbcglobal.net] 
> Sent: Tuesday, February 23, 2010 7:28 PM
> To: jfor at quik.com; Dick KF4NS
> Cc: boatanchors at mailman.qth.net
> Subject: Re: [Boatanchors] tube tester readings
> 
> 
> The term Mhos ( 1/Ohms ) has not been in use in several decades. The Mho was 
> changed to
> The Siemens.
> 
> Regards and 73....Price WØRI
> 
> 
> 
>> 
>> Transcoinductance is:
>> 
>> Change in Plate Current / Change in Grid Voltage
>> 
>> The units of measure are reciprocal Ohms (1/Ohms) also called Mhos
>> 
>> 
>> 
>>> Ok, this may seem like a duh to some, but on my B&K Dyna-jet tube
>>> tester, the meter is scaled numerically from 1-120 but I have no idea
>>> what the reference quantity means. The REPLACE-REJECT-GOOD markings
>>> are not too much for my small brain. I know this is a mutual
>>> conductance tester and I know what that means but have no idea how
>>> this scale translates to that.
>>> 
>>> Another unknown is regarding dual section tubes. The chart shows a
>>> test 1 and test 2 but no reference in the manual as to which section
>>> of the tube is which.
>>> 
>>> Please enlighten me.
>>> 
>>> Thanks and 73, Dick KF4NS
>>> St Petersburg, FL 33714 USA
>>> Keep The Glow!
>> 
>> 
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