Browse Prior Art Database

Portable, Small Contact Area Surface Resistance Probe Assembly

IP.com Disclosure Number: IPCOM000111326D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Jordhamo, GM: AUTHOR [+3]

Abstract

Disclosed is a portable, small contact area surface resistance probe used to measure static dissipative materials (10E5 - 10E12 ohms).

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Portable, Small Contact Area Surface Resistance Probe Assembly

      Disclosed is a portable, small contact area surface resistance
probe used to measure static dissipative materials (10E5 - 10E12
ohms).

      The probe consists of conductive rubber contacts in a
concentric ring configuration which are attached to a spring-loaded
plunger.  The plunger is contained within a housing.  Separate leads
are attached to the outer ring and inner solid circular contacts and
terminate at connectors on the opposite end of the probe (Figure).
The spring-loaded elastomer contacts provide a contact force which is
variable, depending on the type of spring used.  A typical contact
force for most measurements is about 12 PSI.  In the event the
conductive rubber contacts become damaged or soiled.  They can easily
be replaced by removing the entire plunger assembly (includes
conductive rubber contacts, plunger, and spring-guide rails) and
replacing it with a new one.  The size of the conductive rubber
contacts can be reduced provided the same surface area ratio between
the outer concentric ring and center circular contact is
approximately maintained.  The probe can be used on large or small
parts provided there is a flat surface area large enough so that the
entire conductive rubber electrode assembly is in contact with the
surface.  To operate the probe, a force (usually hand-held) is
applied along the long axis of the probe such that the conductive
rubber contact plunger as...