Return-Path: Received: from out003.verizon.net ([206.46.170.103] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3078909 for flyrotary@lancaironline.net; Sun, 14 Mar 2004 23:12:31 -0500 Received: from netzero.net ([4.12.145.173]) by out003.verizon.net (InterMail vM.5.01.06.06 201-253-122-130-106-20030910) with ESMTP id <20040315041230.EWNR2031.out003.verizon.net@netzero.net> for ; Sun, 14 Mar 2004 22:12:30 -0600 Message-ID: <40552D2C.4030905@netzero.net> Date: Sun, 14 Mar 2004 23:12:28 -0500 From: Finn Lassen User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax; PROMO) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: EMU in the wild References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------090903010102070705010301" X-Authentication-Info: Submitted using SMTP AUTH at out003.verizon.net from [4.12.145.173] at Sun, 14 Mar 2004 22:12:30 -0600 This is a multi-part message in MIME format. --------------090903010102070705010301 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Actually soldering the wires together may also introduce error voltages. The trick is to have identical errors in each wire so they balance out. That's why they use dual-pole switches when monitoring multiple EGT/CHT's with one meter. As soon as you have two different metals in contact you have a termocouple point with it's resulting voltage. I guess if you twist the (identical metal) wires together to create the electical connection between them and just use the solder as a method of securing the connection, there won't be an error voltage. Finn Russell Duffy wrote: > There exist terminal blocks for thermocouples that are fabricated with > the metals used in the thermocouple. > > Bill Schertz > KIS Cruiser # 4045 > > Great, NOW you tell me :-) I may look into this, but for now, they'll > just hang around in a loop when not in use. > > Thanks, > Rusty > --------------090903010102070705010301 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Actually soldering the wires together may also introduce error voltages.
The trick is to have identical errors in each wire so they balance out.

That's why they use dual-pole switches when monitoring multiple EGT/CHT's with one meter.
As soon as you have two different metals in contact you have a termocouple point with it's resulting voltage.
I guess if you twist the (identical metal) wires together to create the electical connection between them and just use the solder as a method of securing the connection, there won't be an error voltage.

Finn

Russell Duffy wrote:

Message
There exist terminal blocks for thermocouples that are fabricated with the metals used in the thermocouple.

Bill Schertz
KIS Cruiser # 4045

Great, NOW you tell me :-) I may look into this, but for now, they'll just hang around in a loop when not in use.

Thanks,

Rusty

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