WB testing problems

[Stephen Andersen]

My Multimeter is a Fluke 79.  I have also tested
it with my cheapo Goldstar digital meter.  No change.
I did the check with the 100k resistor to the +4V side 
of R38 and I get 7.8 volts, but still 6.75-6.8 at pin 
5 of U3 even with a 100k inline.

Any ideas from anyone, or should I just continue with 
the rest of the tests?  Anything obvious that it could be?

Thanks,
Steve

> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of bcroe at juno.com
> Sent: Saturday, April 13, 2002 1:11 AM
> To: diy_efi at diy-efi.org
> Cc: Stephen Andersen
> Subject: WB testing problems
> 
> 
> Steve, 
> 
> Possibly the problem is your voltmeter.  If it is not a high 
> impedance (usually digital) type, it may load down the 
> circuit.  Try connecting your meter to J12, and through a 
> 100,000 ohm resistor to the + 4V end of R38.  If you see 
> the same 6.75 volts, it's just the meter.
> 
> 98K is plenty close enough for R38.
> 
> Bruce Roe
> 
> On Fri, 12 Apr 2002 21:31:55 -0400 Stephen Andersen 
> <SAndersen at advan-tek.com> writes:
> > Okay, I am testing out my assembled WB board using the 
> > www.diy-wb.com instructions.  I worked up thru step 14, 
> > but I ran into a wall at step 12.  Measuring from pin 
> > 5 on U3 to J12, with 14 volt input, I get 6.75V.  
> > According to the instructions, I am supposed to get 
> > 7.9-8.0 volts.  It says to check R38, C12, and ISO1.
> > Since I dunno how to check C12 or ISO1, I replaced
> > them with extras.  I also checked R38 and got 98k Ohms.
> > It is supposed to be 100k.
> 
> > Steve
> > andersen at advan-tek.com
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