Return-Path: Received: (qmail 24808 invoked from network); 6 May 2000 02:13:22 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by grants.core.plus.net.uk with SMTP; 6 May 2000 02:13:22 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12ntuq-000429-00 for rsgb_lf_group-outgoing@blacksheep.org; Sat, 06 May 2000 03:02:00 +0100 Received: from tomts2.bellnexxia.net ([209.226.175.140] helo=tomts2-srv.bellnexxia.net) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12ntum-0003zD-00 for rsgb_lf_group@blacksheep.org; Sat, 06 May 2000 03:01:56 +0100 Received: from server1 ([206.172.245.177]) by tomts2-srv.bellnexxia.net (InterMail vM.4.01.02.17 201-229-119) with SMTP id <20000506020101.DURH1435.tomts2-srv.bellnexxia.net@server1> for ; Fri, 5 May 2000 22:01:01 -0400 Message-ID: <000601bfb6fe$6ec18d30$0a00a8c0@server1.ThreeLakes.ca> From: "Larry Kayser" To: rsgb_lf_group@blacksheep.org Subject: LF: RF Thermo Couple Meter, calibration? Date: Fri, 5 May 2000 21:56:46 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 4.72.3110.5 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Greetings All: I uncovered two ancient RF Thermo Couple Meters this evening, I had put them away some years ago in anticipation that at some point I might want to measure RF amps. They are identical, made in 1940, Ref No. 10A/8479. Full scale 2.5 amperes, noted "for Radio Frequency Only". They are of what I would call "light construction" not the heavy duty construction that one associates with the better products made for WW II. How might I calibrate them? I have some excellent calibrated resistors but they are in general a little small to get a couple of amps into them without some residual damage. Is some 60 Hz a little to low "for Radio Frequency Only"? If anyone has a simple process I would appreciate hearing about it. Thanks in advance. Larry VA3LK