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Re: Testing oxygen sensor

To: alex@matrix.com.pl (Aleksander Mierzwa)
Subject: Re: Testing oxygen sensor
From: Orin Eman <orin@WOLFENET.com>
Date: Thu, 4 Dec 1997 11:55:20 -0800 (PST)
Cc: quattro@coimbra.ans.net
In-Reply-To: <0716D052C1CFD0119D280060979FBE9A141B9C@a1.matrix.com.pl> from "Aleksander Mierzwa" at Dec 4, 97 05:12:18 pm
Sender: owner-quattro@coimbra.ans.net


> I've heard that one shouldn't attempt to measure the voltage of the
> oxygen sensor, since even the small resistance of the voltmeter can
> seriously change the sensor's output. Is that true?

You are OK with Digital Voltmeters which usually have an input
impedance of around 10Mohm.

I use National Semiconductor LM3914 chips with a 1Mohm resistor
in series with the input to make O2 sensor LED bargraph displays.
These have no effect on the O2 voltage.

Orin.

References:
- Testing oxygen sensor
  - From: Aleksander Mierzwa <alex@matrix.com.pl>

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