Light - Keithley 2500 User Manual

F-8 Measurement Considerations
Figure F-3
Eliminating ground loops
Instrument 1

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.
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Instrument 2 Instrument 3
Power Line Ground
Models 2500 and 2502 User's Manual