GMECM Digest V2 #644

[Don Burns]

>Is there a way to test to find out if a analogy (needle) type meter has
>enough impedance to work with say an O2 sensor?.
>
>Doeas any one know of a specific model (and cheap) one?
>TIA

Bruce,

"Cheap" is the operative work here. Yes, there are high input impedance
analog meters on the market today, but they are not cheap. If you don't
want to build something such as suggested by Bob Hughs, what you should be
looking for is an old Heathkit or similar VTVM. VTVMs built back in the
50s, 60s and 70s are all high input Z and will work fine. There is nothing
like watching a good olde analog meter. You can see stuff that digital
meters just can't display. There are a lot of old still working VTVMs
floating around.

Another suggestion: Do you have access to a scope with a DC input? This
could give you a cool analog like display of whats going on at the O2
sensor and the scope's input will no doubt be high Z.

Don


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