If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
The Simpson 270 series multi meters made a claim as shown in the attachment.
Noticed a little finger was added to the stop pins, to touch the inner surface of the glass metallically at the bottom on one side. This finger was in contact with the meter metal pointer.
Simpson had been making meters for decades before the the 270 was introduced in ~1961.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
Probably some way to avoid static electricity in the glass cover, that could attract the pointer and cause false readings. The same problem is known from compasses.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Yes the glass is what I thought. But sadly the glass is gone. Its a parts meter. I have about 10 more Simpson 260/270 meters. Logic prevents me from getting to them just now.
The issue came to life because the parts meter was used to find out the effects of a magnet needing recharging in a 270 .
When I get the other meters out, I'll try something to see if the face to back of the glass does bleed a charge.
Meters have been made for ages with that problem.
What so amazing was developed in the 1960's, to use it in their meters?
Registered Member #230
Joined: Tue Feb 21 2006, 08:01PM
Location: Gracefield lower Hutt
Posts: 284
They probably used PYREX glass which is ever so slightly conductive. Pyrex is used for high voltage insulators for this slight conductivity as it distributes the charge gradient evenly --so it has a higher standoff voltage than pure insulators of the same size
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Soon I hope to get at other 4 270s in the 260/270 lot. I've done stress cone work but not in glass There was another part that was in the (the parts meter) that would have gone unnoticed had the glass been there. It was a aluminum channel glued into the case that supported the glass at the bottom. Was the other purpose of this was to run a metal along that actually both touched glass faces ?
I looked into a patent long ago, for a product called Rust Evader System, that was a means of distributing a charge by a small high voltage generator, out on the painted surface of a car. This idea was to prevent water from broaching the paint, and causing rusting.
When I get my ten 200 meg resistors from Electronic Goldmine, I will start experimenting. I bought a Megger from the Orient for about $20 US and free delivery. range to 2000 megs at 2000 volts.
It does work very well. Ham radio operators discovered it, and that's how I learned.
TI has a sensor system chip that can probe fields in 3D. Small money. Later perhaps.
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
Two things converging, in a high voltage puzzle in electrostatics.
