[Diy_efi] WB02 not passing tests completely

rob files rncfiles at hotmail.com
Fri May 24 15:48:41 GMT 2002


No dice.  All components check out ok.  Maybe it's a suspect opamp?

With the longer time constant, will my Vout contain more error, or will be 
slower to react?  I guess I could lower R18 to 20k or so...that should about 
double it's speed, right?

Thanks for the help,
Rob


From: rr <RRauscher at nni.com>
>Reply-To: Diy_efi at diy-efi.org
>To: Diy_efi at diy-efi.org
>Subject: Re: [Diy_efi] WB02 not passing tests completely
>Date: Thu, 23 May 2002 17:02:55 -0400
>
>This tests the integral function. This function is what brings
>the feedback loop to zero error (slowly). Your DIY-WB will
>function even with a longer time constant.
>
>Also check R33, C7 and R17. They may have some effect
>on what you are seeing.
>
>If all looks OK, try it out. No damage will be caused with
>the longer time constant.
>
>BobR.
>
>
>rob files wrote:
>
> > Hi BobR,
> >
> > What is the significance of these time specs?  Which components 
>influence?
> > >From the test procedures and from inspection of the circuit, it appears 
>to
> > be controlled by C10, R18 and R34.  I have verified the resistors, and 
>C10
> > is the big ass capacitor, so that one is hard to get wrong.  Maybe I 
>have
> > short on one of my traces...
> >
> > Still I would like to understand a little better what these tests 
>validate
> > and what the slow ramp times would mean to the operation of the WB 
>sesor.
> >
> > Thanks for the help,
> > Rob
> >
> > >From: rr <RRauscher at nni.com>
> > >Reply-To: Diy_efi at diy-efi.org
> > >To: Diy_efi at diy-efi.org
> > >Subject: Re: [Diy_efi] WB02 not passing tests completely
> > >Date: Thu, 23 May 2002 16:27:25 -0400
> > >
> > >That doesn't sound right. If it is truely twice as long I'd look for
> > >a resistor(s)/capacitors(s) that are mis-placed. Remember
> > >that these time factors are +- 10% due to the available components.
> > >
> > >BobR.
> > >
> > >
> > >
> > >rob files wrote:
> > >
> > > > Hi all,
> > > >
> > > > For steps #34 and #42 there are time constants given.  For both 
>tests,
> > >my
> > > > board takes roughly twice as long as specified.  Is this a problem, 
>and
> > >if
> > > > so, where should I look?
> > > >
> > > > It passes all other tests with flying colors.
> > > >
> > > > Thanks,
> > > > Rob
> > > >
>
>
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