[Amps] Simpson 260 question

[Karl-Arne Markström]

I would strongly advise against measuring non-current limited amplifier 
plate voltages in the kV region with the standard Simpson 260.

The internal and external flash-over distances are not sufficiently long for 
any safety margins, and hairline cracks, dust and dirt may create stray 
current leakage paths.

In the 60's, there was a fatal accident at my 'Alma Mater' ,Chalmers Univ. 
of Tech., when a research engineer tried to monitor the cavity voltage of a 
large Klystron using a Simpson multimeter, which flashed over to his body 
through the phenolic case.

When measuring plate voltages, a properly insulated voltage divider made of 
many series connected high-voltage resistor is the recommended method.

73/

Karl-Arne
SM0AOM




----- Original Message ----- 
From: "Val Erwin" <valerwin at att.net>
To: <amps at contesting.com>; <K1SG at aol.com>
Sent: Monday, August 03, 2009 9:29 PM
Subject: Re: [Amps] Simpson 260 question


Howdy Steve........

This should give you all the info you need:

http://www.simpson260.com/260-5/simpson_260-5.htm


Best regards,

Val Erwin, W5PUT

--- On Mon, 8/3/09, K1SG at aol.com <K1SG at aol.com> wrote:


From: K1SG at aol.com <K1SG at aol.com>
Subject: [Amps] Simpson 260 question
To: amps at contesting.com
Date: Monday, August 3, 2009, 7:16 PM


I have a Simpson 260, Series 5. What I don't have is the manual for it.
What I'd most like to know is what accuracy it's rated for on the 5000 volt
scales, both AC and DC. I believe the meter is rated for 2% of full scale
accuracy up to 1000 volts DC and 3% on AC, but I haven't been able to track
down a number for the HV scales.

Your help, as always, is appreciated!
Steve

Steve Gilbert
K1SG
K1SG at AOL.com
508-435-9133
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