With respect, this is just arguing semantics.
It does not matter where the (considerably high) voltages come from or go
to, they still exist and need adequate precautions to prevent damage.
Stand on a stepladder, then rub your hair with a balloon, touch the ceiling
then "hang" the balloon on the ceiling. Touching the ceiling should have
discharged and high voltage potential, but the balloon still "sticks".
Did you ever try to complete a lengthy project whilst keeping part of your
anatomy constantly in touch with the frame, or try to open an anti-static
bag with one hand 'fixed' to a stationary point?
I prefer to spend a few dollars on good insurance, rather than wonder
whether I may just have lifted my arm at the same time as I shuffled in my
nylon underwear. :-)
AFAIC the instructions in manuals to touch bare metal, are a there to inform
those who insist on not taking adequate precautions, at least make an
attempt to discharge themselves.
73,
Alan. G4GNX
-----Original Message-----
From: rkr...@johngalt.biz
Sent: Friday, December 22, 2017 7:08 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Upgrading a K3?
On 12/22/2017 12:16 PM, G4GNX wrote:
Firstly, you absolutely MUST use an anti-static mat, suitably connected to
ground and an anti-static wrist strap. Whilst you might "get away with it"
without those items, you may cause unseen damage and you won't know until
it breaks down. I know the manuals state that you can "touch a metal
object", but that's very hit and miss.
I'm going to respectfully disagree. The problem is not the static or
the ground, the problem is when you have a differential voltage between
items.
If you always maintain a forearm on the frame of your device and handle
things carefully while maintaining contact with the frame, you will all
be at the same electrical potential. Be sure to be in contact with the
frame when opening anti-static bags, too. Hold boards by the edges,
don't finger the gold contacts, and don't touch components if you don't
have to.
This technique has worked for me for years. I don't do sensitive work
often, but I never seem to have all the 'anti-static' stuff when I need it.
The only danger is if you get carried away and lift that arm.
73
Ray
KK4WPB
Molon labe
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