Re: [Elecraft] Anti-static Pads

2016-09-20 Thread Richard Fjeld
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

Re: [Elecraft] Anti-static Pads

2016-09-20 Thread Fred Jensen
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

Re: [Elecraft] Anti-static Pads

2016-09-20 Thread Fred Moore
aud. 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-static Pad

Re: [Elecraft] Anti-static Pads

2016-09-20 Thread Terry Schieler
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,

Re: [Elecraft] Anti-static Pads

2016-09-19 Thread Alan Bloom
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.

Re: [Elecraft] Anti-static Pads

2016-09-19 Thread Richard Fjeld
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:

Re: [Elecraft] Anti-static Pads

2016-09-19 Thread Ron D'Eau Claire
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. I don't think it i

Re: [Elecraft] Anti-static Pads

2016-09-19 Thread Fred Jensen
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

Re: [Elecraft] Anti-static Pads

2016-09-19 Thread Jim Rhodes
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

Re: [Elecraft] Anti-static Pads

2016-09-19 Thread Richard Fjeld
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

Re: [Elecraft] Anti-static Pads

2016-09-19 Thread Ron D'Eau Claire
. 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] Anti

Re: [Elecraft] Anti-static Pads

2016-09-19 Thread Don Wilhelm
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

Re: [Elecraft] Anti-static Pads

2016-09-19 Thread Don Wilhelm
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

Re: [Elecraft] Anti-static Pads

2016-09-19 Thread Fred Jensen
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

Re: [Elecraft] Anti-static Pads

2016-09-19 Thread Ron D'Eau Claire
September 19, 2016 12:10 PM To: elecraft@mailman.qth.net Subject: [Elecraft] Anti-static Pads Ron – Your post (below) came at the right moment. I am about to begin building another K2 and wondered whether my anti-static pad, now more than five years and ten Elecraft kits old, needs some sort o

[Elecraft] Anti-static Pads

2016-09-19 Thread Dauer, Edward
Ron – Your post (below) came at the right moment. I am about to begin building another K2 and wondered whether my anti-static pad, now more than five years and ten Elecraft kits old, needs some sort of cleaning to maintain its properties; and, if so, what to clean it with – or maybe to