Return-Path: <13brv3@bellsouth.net> Received: from imf23aec.mail.bellsouth.net ([205.152.59.71] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 381470 for flyrotary@lancaironline.net; Fri, 27 Aug 2004 16:30:01 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.71; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf23aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040827202857.BQTC1796.imf23aec.mail.bellsouth.net@rd> for ; Fri, 27 Aug 2004 16:28:57 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: EM-2 Liquid temp 2 and 3 connection Date: Fri, 27 Aug 2004 15:29:13 -0500 Message-ID: <00ca01c48c74$845e15f0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00CB_01C48C4A.9B880DF0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_00CB_01C48C4A.9B880DF0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable This looks like it is a simple voltage divider in which case the = resistor values shouldn't matter much so long as the 2 resistors are within a few = of ohms of each other. Or is there something I'm overlooking? The reason I ask is that 200ohms is not a standard resistor value (so I don't have any in my = parts box), so it doesn't seem likely that Tracy would chose that value for a simple voltage divider, unless there is another reason. S. Todd Bartrim=20 =20 Tracy said 200, and I didn't question it. I believe I used two 100 ohm resistors instead, and they were typical Radio Scrap items. I believe = Tracy said he got the resistors online somewhere, and used 1% tolerance. =20 Looking at the circuit, I wouldn't use anything significantly different = from 200 ohms, because one of those resistors is in parallel with the = resistance of the sensor. I would suspect this would just become a calibration = issue though. My temps have seemed correct with the new software, though I'm hoping I can make the oil temp prove to be too high so my oil temp = issues will go away :-) Rusty =20 ------=_NextPart_000_00CB_01C48C4A.9B880DF0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
This looks like it = is a simple=20 voltage divider in which case the resistor values shouldn't matter much = so long=20 as the 2 resistors are within a few of ohms of each = other.

        Or is there something I'm overlooking? The reason I ask is that = 200ohms=20 is not a standard resistor value (so I don't have any in my parts box), = so it=20 doesn't seem likely that Tracy would chose that value for a simple = voltage=20 divider, unless there is another reason.

S. Todd=20 Bartrim 
 

Tracy said 200, and I didn't question = it.  I=20 believe I used two 100 ohm resistors instead, and they were typical = Radio=20 Scrap items.  I believe Tracy said he got the resistors online = somewhere,=20 and used 1% tolerance.   

Looking at the circuit, I wouldn't use = anything=20 significantly different from 200 ohms, because one of those resistors is = in=20 parallel with the resistance of the sensor.  I would suspect=20 this would just become a calibration issue though.  My = temps have=20 seemed correct with the new software, though I'm hoping I can make the = oil temp=20 prove to be too high so my oil temp issues will go away=20 :-)

Rusty=20   

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