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Model 6517B Electrometer Reference Manual Section 3: Connections

6517B-901-01 Rev. C / August 2015 3-15

Handling and cleaning test fixtures

Dust, body oil, solder flux, and other contaminants on connector and terminal insulators can

significantly decrease the leakage resistance resulting in excessive leakage currents. Also,

contaminants on DUT and test circuit components can create a leakage path. These leakage currents

may be large enough to corrupt low-level measurements.

Handling tips:

 Do not touch the bodies of DUT or test circuit components. If you cannot handle them only by

their leads, use clean cotton gloves to install them in the test fixture.

 Do not touch any connector or terminal insulator.

 If installing a test circuit that is on a pc-board, handle the board only by the edges; do not touch

any board traces or components.

Cleaning tips:

 Use dry nitrogen gas to clean dust off of connector and terminal insulators, DUT, and other test

circuit components.

 If you have just built the test fixture, remove any solder flux using methanol along with clean

foam-tipped swabs or a clean soft brush.

 To clean contaminated areas, use methanol and clean foam-tipped swabs. After cleaning a large

area, you may want to flush the area with methanol. Blow dry the test fixture with dry nitrogen

gas.

 After cleaning, the test fixture (and any other cleaned devices or test circuits) should be allowed

to dry in a 50°C low-humidity environment for several hours.

Keithley 6517B Reference Manual

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