Operation
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3.13.7 Keeping connectors clean
As is the case with any high-resistance device, the integrity
of connectors can be compromised if they are not handled
properly. If connector insulation becomes contaminated, the
insulation resistance will be substantially reduced, affecting
high-impedance measurement paths. Oils and salts from the
skin can contaminate connector insulators, reducing their re-
sistance. Also, contaminants present in the air can be depos-
ited on the insulator surface. To avoid these problems, never
touch the connector insulating material. In addition, the
scanner card should be used only in clean, dry environments
to avoid contamination.
If the connector insulators should become contaminated, ei-
ther by inadvertent touching, or from air-borne deposits, they
can be cleaned with a cotton swab dipped in clean methanol.
After thoroughly cleaning, they should be allowed to dry for
several hours in a low-humidity environment before use, or
they can be dried more quickly using dry nitrogen.
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