Return-Path: Received: (qmail 12698 invoked from network); 6 May 2000 18:05:41 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by grants.core.plus.net.uk with SMTP; 6 May 2000 18:05:41 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12o8qi-0002Hx-00 for rsgb_lf_group-outgoing@blacksheep.org; Sat, 06 May 2000 18:58:44 +0100 Content-Transfer-Encoding: 8bit Received: from smtper.inrete.it ([212.110.32.184] helo=mailer.inrete.it) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12o8qg-0002Hs-00 for rsgb_lf_group@blacksheep.org; Sat, 06 May 2000 18:58:43 +0100 X-Priority: 3 X-MSMail-Priority: Normal Received: from cel266 ([151.25.130.18]) by mailer.inrete.it (8.8.8/8.8.8) with SMTP id TAA28456 for ; Sat, 6 May 2000 19:58:22 +0200 Date: Sat, 6 May 2000 19:58:22 +0200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <4.1.20000506185622.0108a610@mailer.inrete.it> X-Sender: spin@mailer.inrete.it X-Mailer: QUALCOMM Windows Eudora Pro Versione 4.1 Data: Sat, 06 May 2000 18:58:52 +0100 To: rsgb_lf_group@blacksheep.org From: "M. Bruno" Subject: Re: LF: Re: RF Thermo Couple Meter, calibration? In-reply-to: <003701bfb77d$b2927180$261c893e@h9h2t8> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: >I always believed that you could calibrate true bolometric RF ammeters using >DC? I've checked a couple of thermocouple RF ammeters and it seems to work. >Martin Evans You can, if you calibrate in DC reversing the current flow and averaging the readings. Many thermocouple ammeters exibit asymmetries, probably due to other thermocouple effects in the joints, that are nulled in AC. 73, Marco IK1ODO