units of measurement, explained

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units of measurement, explained

Steve Jackson-5
uuF was used to spec cap values in tube equipment.
The introduction of semiconductors forced a conversion
to use the 'pico' prefix.

Same with hertz.  Tube gear measured frequency in
cycles per second.  The transistor changed all of
that.

Today, the use of surface mount parts has caused the
need for 'nano.'




               
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RE: units of measurement, explained

Brian Wruble
How in the world did a change to solid state affect a naming convention?  1
Hz = 1 cps, regardless of the circuit devices.  1 uuf ("micro micro farad")
= 1 pf, regardless of the devices used in the circuit.  I am baffled by this
notion. Can you provide more evidence?  73 de Brian W3BW

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Steve Jackson
Sent: Friday, December 17, 2004 07:22
To: [hidden email]
Subject: [Elecraft] units of measurement, explained

uuF was used to spec cap values in tube equipment.
The introduction of semiconductors forced a conversion
to use the 'pico' prefix.

Same with hertz.  Tube gear measured frequency in
cycles per second.  The transistor changed all of
that.

Today, the use of surface mount parts has caused the
need for 'nano.'




               
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RE: units of measurement, explained

Mike S-8
At 08:08 AM 12/17/2004, Brian Wruble wrote...
>How in the world did a change to solid state affect a naming convention?  1
>Hz = 1 cps, regardless of the circuit devices.  1 uuf ("micro micro farad")
>= 1 pf, regardless of the devices used in the circuit.  I am baffled by this
>notion. Can you provide more evidence?  73 de Brian W3BW

Post hoc, ergo propter hoc. It's an error in logic, same as concluding that your alarm clock causes the sun to rise. That is of course incorrect, since it actually causes the horizon to set.

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Re: units of measurement, explained

Peter Burbank
In reply to this post by Steve Jackson-5
At 07:22 AM 12/17/2004, Steve Jackson wrote:

>Today, the use of surface mount parts has caused the
>need for 'nano.'

Not to mention the need for an increase in cursing at the workbench. :-)
Pete NV4V


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