G=1/R as I remember it.
Yes, I wanted to reply to Alan's method, but I have been away. I wanted
to re-read it to see if he allowed time to determine if a cap was leaky
first. It was a clever idea. I have two Simpson's so I should be able
to duplicate the test, if I can round up exposed meta
Simplest way I know: Conductivity = 1 / Resistance. All you need is a
slide rule. :-) But seriously,
Alan's method ... charge a capacitor to a known voltage, discharge it
through the mat to a lower voltage measuring how long it takes, and use
the RC time constant to calculate the resistance
or fraud. Every dog has his day.
>
> Check your receptacles.
>
> Terry, WØFM
>
>
>
> -Original Message-
> From: Don Wilhelm [mailto:donw...@embarqmail.com]
> Sent: Monday, September 19, 2016 3:59 PM
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] Anti-stati
Monday, September 19, 2016 3:59 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Anti-static Pads
Hi all,
While I can state that Ron's comment about the K2 is typically true, the static
tolerance of thru-hole ICs and transistors is lower than it was back in 1998 or
even 2006 (OK,
On 09/19/2016 08:32 PM, Richard Fjeld wrote:
I stand corrected. I didn't realize the resistance was that great.
I need to think of a simple way to determine conductivity rather than
measuring the resistance.
Here are the results of some anti-static mat testing that I did a few
years ago. If
I stand corrected. I didn't realize the resistance was that great.
I need to think of a simple way to determine conductivity rather than
measuring the resistance.
Thanks for the answers.
Dick, n0ce
__
Elecraft mailing list
Home: ht
..@mailman.qth.net] On Behalf Of
Richard Fjeld
Sent: Monday, September 19, 2016 7:34 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Anti-static Pads
At this point; A Question about how to properly test an anti-static mat?
I bought one last winter that appears to be totally non-conductive
10^9+ ohms [1,000 megohms or more] is pretty much "non-conductive" for
anything we ordinary hams have to measure it. My Heath MM-1 just
doesn't register at that. :-)
Whether or not your mat is any good for ESD protection, and whether or
not you can believe the specs if it has them, depends a
Well, the resistance of a good one is probably higher than what a normal
VOM could measure. A merger might measure it, but having never had access
to one I couldn't be sure.
On Sep 19, 2016 8:35 PM, "Richard Fjeld" wrote:
At this point; A Question about how to properly test an anti-static mat?
At this point; A Question about how to properly test an anti-static mat?
I bought one last winter that appears to be totally non-conductive. I
don't think it is my error.
If others have mats like this, and are trusting them, I can see the
possibility for failures.
Dick, n0ce
P.S. I like readin
tube. Now the tables are turned and we have to worry more about the
equipment.
73, Ron AC7AC
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don
Wilhelm
Sent: Monday, September 19, 2016 1:59 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft]
Hi all,
While I can state that Ron's comment about the K2 is typically true, the
static tolerance of thru-hole ICs and transistors is lower than it was
back in 1998 or even 2006 (OK, I picked those years as a guess). Many
DIP mounted devices are really SMD devices with DIP leads and can be as
Hi all,
A point I failed to make in my comments below is that the goal of
anti-static measures is to keep everything at the same potential (and
not necessarily to 'ground things').
For instance, all my tools touch my anti-static mat before I use them,
and when I remove a device which is shippe
I built K2 S/N 4398 the same as Ron, on a desktop with a Formica top in
a room with a carpet. I kept all semiconductor parts in their
anti-static bags and/or conductive foam, and touched ground before
picking them up. My soldering station is static-safe. I tried not to
shuffle my feet on the
Hello Ed:
I don't have any experience with mat cleaners. Perhaps some of the other list
members do.
If your old mat did not come with a resistance value specified, I suggest
replacing it. The Elecraft engineer testing a variety of mats found that the
resistance of a mat without a spec was alw
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