Re: Cal Lab Magazine - International Journal of Metrology
Incidentally, this functionality has been available on x86 PCs for decades, and was prominently displayed inside the back cover of the WordPerfect 5.1 manual (circa 1990). I haven't looked lately (no
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Jim Strohm
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#393
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Re: RF Current meters
How do you vary the size of the quantum hole? Ken g8beq
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Kenneth Greenough
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#391
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Re: Cal Lab Magazine - International Journal of Metrology
Yup, e.g. mS is part the specification of every FET, where it plays the same role as Hfe in BJTs. (Hfe is, of course, playing fast and loose with capitalisation!)
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Tom Gardner
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#389
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Re: Cal Lab Magazine - International Journal of Metrology
Thank you Steve, Something I never knew before, now I'll have to spend a few hours exploring. regards ken G8BEQ >
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Kenneth Greenough
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#388
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Re: Cal Lab Magazine - International Journal of Metrology
I just took a look at a few hobbyist magazines and some product schematics from several different decades, and your speculation looks pretty solid. Based on that random, statistically insignifcant
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Tom Lee
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#387
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Re: Cal Lab Magazine - International Journal of Metrology
Very likely a UK/US thing. pF (puff) has always been in common usage here from the very early days so mmF would not have been common; nano, however, took some time to gain traction, probably as late
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G8HUL
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#386
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Re: Cal Lab Magazine - International Journal of Metrology
Hi, Jeff, It is quite probably an example of differing usage in the US v the UK, with the US simply not willing to pay for a mu until recently. :)? And "mickey-mikes" certainly sounds American, given
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Tom Lee
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#385
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Re: Cal Lab Magazine - International Journal of Metrology
Now instead of micky-mikes,we would ask for a 270 puff cap. John
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John Kolb
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#384
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Re: Cal Lab Magazine - International Journal of Metrology
I have handbooks dating back to 1925 and they use ? as the abbreviation for 10-3, but some still prefer Jars for capacitance! I is possible that it is a US v UK thing, or just widespread incorrect
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G8HUL
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#383
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Re: Cal Lab Magazine - International Journal of Metrology
Of course not, which is why my example, the entirety of which is delimited with quote marks, does not contain an adjectival clause. You seem to have lost track of the topic of discussion, which was
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Tom Lee
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#382
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Re: Cal Lab Magazine - International Journal of Metrology
You'd not say "a 2 watts light bulb" though, would you? When used adjectivally, it seems there is no plural. But you'd probably say that light bulb consumes (dissipates?) "2 watts" when supplied with
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Orin Eman
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#381
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Re: RF Current meters
I have been wondering if it¡¯s possible to make an RF ammeter from nichrome wire and measure the IR radiation to measure the heat caused by the RF current. A DC substitution would allow the RF
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Dr. David Kirkby, Kirkby Microwave Ltd
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#380
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Re: Cal Lab Magazine - International Journal of Metrology
Not so much a mistake as merely a holdover from the days when mF was in fact the conventional abbreviation for microfarad, just as mmF (micro-microfarad) was used for what we now call the picofarad.
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Tom Lee
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#379
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Re: RF Current meters
The 0-3 Amp meter looks interesting, but I would prefer to find one for $5 at a ham radio swap meet. Or ask a local ham to refer you to an old-timer that used to build their own equipment and might
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John Kolb
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#378
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Re: Cal Lab Magazine - International Journal of Metrology
It is odd however how a document from the BIPM https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf states on page 76 of the PDF "the luminous efficacy Kcd of monochromatic radiation of
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Dr. David Kirkby, Kirkby Microwave Ltd
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#377
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Re: Cal Lab Magazine - International Journal of Metrology
I disagree, more strongly now than before, given the citation that you present in bold. The key word that you have missed is ¡°symbol¡±. One certainly should not add an ¡°s¡± to pluralize a
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Tom Lee
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#376
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Re: Cal Lab Magazine - International Journal of Metrology
On just about any PC keyboard you can type a ? by holding down <Alt>, typing 2 3 0 on the numeric keypad, and releasing <Alt>. In some applications NumLock must be on for this to work. I have a table
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Steve Hendrix
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#374
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Re: Cal Lab Magazine - International Journal of Metrology
I am not sure whether NF (newton farad) is of use to anyone as a unit, but mF (milli farad) is likely to cause confusion as it is often, mistakenly, used for micro farad. uF is a little more
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G8HUL
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#373
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Re: Cal Lab Magazine - International Journal of Metrology
(corrected text) One of the earliest schematics I crossed was the Howard W Sam's Photofact for a 1951 Westinghouse television. It used the lower case letter 'u' for? mu, thus a 10 microfarad
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Chuck Moore
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#372
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Re: Cal Lab Magazine - International Journal of Metrology
Ltd <drkirkby@...> wrote: "Might not see it as you intended...." In the 1990s, when I was at Motorola SPS here in Austin, we had a mixed-OS workplace. Some folks had PCs, some folks
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Jim Strohm
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#371
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