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An L-shaped probe and tuning fork type of connector can be connected to permit four-terminal resistance measurements of a suspect circuit contact between a card and board without disturb- ing the contact.
English (United States)
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Four-Terminal Resistance Probe Arrangement
An L-shaped probe and tuning fork type of connector can be connected to
permit four-terminal resistance measurements of a suspect circuit contact
between a card and board without disturb- ing the contact.
In the figure, circuit card 1 carrying components 2 and having spring contacts
3 is installed between conductive pins 4 extending through board 5. Resistance
measurement of the current path between a spring contact 3 and its mating pin 4
is made by means of a four point probe. One probe terminal comprises L-
shaped insulator block 6 carrying two conductors 7A, 7B on its surface that each
attach to a respective one of a pair of cur- rent-voltage terminals of a milliohmeter
(not shown). Connector 8 of the tuning fork type is a second probe and is
modified to form two separate halves 8A, 8B each contacting the lower exten-
sion of pin 4. The two connector halves are each connective to respective ones
of a second pair of current-voltage terminals on the meter. These probes permit
testing of an installed card/board contact without interference or requiring
removal of the card, and thus destroying a suspect contact. When plural cards 1
are mounted to board 5 in a planar parallel relationship, the L-shaped probe
provides access to the contacts 3 and clear- ance of the surface mounted