Joe, Does a meter such as I have, the A.W. Sperry Model Dm-2a, described on the packaging as having "electronic overload protection, meet your criteria? That is, does that term mean, to you, " approved for use on computer controlled-cars?" Features: UL Listed in US and Canadian Safety Standards limited one-year warranty ELECTRONIC OVERLOAD PROTECTION autorangin simple operation continuity buzzer rangehold button built-in test leads... Cost appx $30.00...Usual disclaimers apply Tom Hanlon Palm Springs, CA 84 Westfalia "Joe L." wrote: > Im no expert but one thing I DO know. If you are gonna mess around with > any vehicle with a computer on it you MUST have a voltmeter with what is > known as a "High Input Impeadence" (10 megs or higher). This is basically > how much of a load the meter itself puts on a circuit when you use it. > What you do when you use a voltmeter is sort of the same thing you do > when you plug the toaster into the wall socket; you add the meter to > whatever curcuit you are testing and this increases the load on that > circuit. Plug in one too many toasters and you blow the fuse. "Plug in" a > low impeadence voltmeter and you blow the computer! This is why you will see > words like "Approved for use on Computer Controlled cars" on SOME > voltmeters but not on others. > Nowadays it is pretty easy and inexpensive to find a suitable one > (usually digital) but you cant just get whatever is cheapest at the Radio > Shack.Sunpro puts out a deceint one ($40??) you can pick up at your local > FLAPS. > > ----- Original Message ----- > From: Jeff Gilbert <jeff_gilbert@PEOPLESOFT.COM> > To: <vanagon@GERRY.VANAGON.COM> > Sent: Thursday, August 19, 1999 12:26 PM > Subject: Which Voltmeter to use? > > > Hi, > > > > Im new to all this diagnosis stuff and was wondering if someone could shed > > some light on what would be a good voltmeter to aid in the diagnosis of a > > never ending, son of a bitch, fuel injection problem. Bently suggests > > using the VW meter...is this necessary, or will any good quality meter do? > > > > Thanks, > > > > Jeff |
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