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Re: O2 sensor testing

I have a question regarding the fellow q-listers post regarding testing the O2
sensor properly:

  Where or how exactly do you meter the output of the O2 sensor while the car
is running and/or not running? 

I have a 3 wire sensor which has a 2 pin connector and also a single lead
attachment.  I have tried metering between all contacts w/probes and have also
used a 2 pin test harness (the one I have for measuring current at the EHA)
and have come up with nothing coherent. 

Am I measuring DC or AC voltage and between which pins?

Thank you,
Briand Parenteau
'87 4kcs