very good.
what is your answer then, to the poster's question ?

----- Original Message -----
From: "David Beierl" <dbeierl@attglobal.net>
To: "Scott Daniel - Turbovans" <scottdaniel@turbovans.com>
Cc: <vanagon@GERRY.VANAGON.COM>
Sent: Wednesday, May 06, 2009 7:11 PM
Subject: Re: O2 sensor transition time

> At 09:39 PM 5/6/2009, Scott Daniel  - Turbovans wrote:
>>a new Bosch, and using a digital volt meter......
>>the voltage was going from about .2 to .8 volts very, very fast.
>>Like several swings in voltage change  or range, per second.
>>I had never bothered to check a new one much.....and boy, did this one
>>change voltages fast.
>
> Hi Scott -- unfortunately, with a digital meter of the usual type it's
> very tough to see what's really going on, only that something is.  This is
> because most digital meters use a technique called "dual-slope
> integration" to develop the reading.  They typically generate a new
> reading about 2-3 times a second, and use a significant fraction of that
> time to sample the input signal; so when the input is changing the results
> appear somewhat random.  The ideal way to measure is with a scope, but an
> LED bar-graph display driven by an LM3914 chip, like Ken's little gadget,
> is a very good alternative for this particular signal.
>
> Cheers,
>
>
>  --
> David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
> '89 Po' White Star "Scamp"