F-8 Measurement Considerations Models 2500 and 2502 User’s Manual
Figure F-3
Eliminating ground loops
Light
Some components, such as semiconductor junctions and MOS capacitors on semiconduc-
tor wafers, are excellent light detectors. Consequently, these components must be tested in
a light-free environment. While many test fixtures provide adequate light protection, oth-
ers may allow sufficient light penetration to affect the test results. Areas to check for light
leaks include doors and door hinges, tubing entry points, and connectors or connector
panels.
Instrument 1 Instrument 2 Instrument 3
Power Line Ground
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