X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 10 Dec 2008 18:17:38 -0500 Message-ID: X-Original-Return-Path: Received: from vms044pub.verizon.net ([206.46.252.44] verified) by logan.com (CommuniGate Pro SMTP 5.2.10) with ESMTP id 3352119 for lml@lancaironline.net; Wed, 10 Dec 2008 02:00:50 -0500 Received-SPF: pass receiver=logan.com; client-ip=206.46.252.44; envelope-from=tom.gourley@verizon.net Received: from jacky0da39824a ([71.111.153.142]) by vms044.mailsrvcs.net (Sun Java System Messaging Server 6.2-6.01 (built Apr 3 2006)) with ESMTPA id <0KBN00LB4FFL7416@vms044.mailsrvcs.net> for lml@lancaironline.net; Wed, 10 Dec 2008 00:59:49 -0600 (CST) X-Original-Date: Tue, 09 Dec 2008 22:59:39 -0800 From: "Tom Gourley" Subject: Re: [LML] ammeter X-Original-To: "Lancair Mailing List" Reply-to: "Tom Gourley" X-Original-Message-id: <004901c95a94$df526b30$640610ac@jacky0da39824a> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3350 X-Mailer: Microsoft Outlook Express 6.00.2900.3138 Content-type: multipart/alternative; boundary="----=_NextPart_000_0046_01C95A51.D0648830" X-Priority: 3 X-MSMail-priority: Normal References: This is a multi-part message in MIME format. ------=_NextPart_000_0046_01C95A51.D0648830 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dan, Do you want to measure current into/out of the battery, or the current = output of the alternator? In the case of measuring alternator output = you'd want an ammeter that can measure the rated output of your = alternator. I'm guessing that's at least 60A, probably more. I'm not = that familiar with IVP electrical loads, but I've seen a Legacy = alternator put out over 50A with everything on the panel turned on, = landing lights, and the gear in transit. By the way, if you have two = alternators you really should have a shunt, or Hall effect sensor = (whichever your ammeter uses), on each alternator output and either two = meters or a way to switch the meter between the two alternators. In the case of measuring current into/out of the battery you'd want an = ammeter that can measure the maximum electrical load of your plane (but = not the starter current), which the battery would have to supply if the = alternator is off line. =20 Tom Gourley ------=_NextPart_000_0046_01C95A51.D0648830 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Dan,
 
Do you want to measure current into/out = of the=20 battery, or the current output of the alternator?  In the case of = measuring=20 alternator output you'd want an ammeter that can measure the rated = output of=20 your alternator.  I'm guessing that's at least 60A, probably = more. =20 I'm not that familiar with IVP electrical loads, but I've seen a Legacy=20 alternator put out over 50A with everything on the panel turned on, = landing=20 lights, and the gear in transit.  By the way, if you have two=20 alternators you really should have a shunt, or Hall effect sensor = (whichever=20 your ammeter uses), on each alternator output and either two meters = or a=20 way to switch the meter between the two alternators.
 
In the case of measuring current = into/out of=20 the battery you'd want an ammeter that can measure the = maximum electrical=20 load of your plane (but not the starter current), which the battery = would have=20 to supply if the alternator is off line. 
 
Tom Gourley
 
 
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