Manufacturers of high reliability circuit boards for certain switching and power-supply equipment must test boards at very high voltages. Traditionally these tests were done manually -- an operator would contact certain points on each board with long insulated hand-held probes. Many boards require testing multiple pairs of points. Some pairs require holding the probes steady during a 30-second test. Tired operators often missed faults and ruined boards by scratching them. GCA solved this problem by developing a complete computer-controlled testing system. At the heart of the system is an adaptor that accepts fixtures that easy to build and inexpensive. Each fixture adapts one circuit design to the tester connections. The fixture contains a set of spring-loaded test probes that make contact with the specific test points of one board. The computer controls how voltage is applied to sets of test probes and records the results of each test. The computer can concurrently test multiple point-pairs to save testing time. GCA's test system has replaced a manual, error-prone and dangerous testing operation with one that is safe, foolproof, auditable and many times faster.	High Voltage Circuit Isolation Testing