2: General operation Series 2600B System SourceMeter® Instrument
2-72 2600BS-901-01 Rev. B / May 2013
Figure 37: Connections for noise shield, safety shield, and guarding
Test fixture
A test fixture can be used to house a device or test circuit. The test fixture can be a metal or
nonconductive enclosure, and is typically equipped with a lid. When properly used, the output of the
Series 2600B will turn off when the lid of the test fixture is opened. The test circuit is mounted inside
the test fixture. When hazardous voltages (>30 V RMS, 42 V peak) will be present, the test fixture
must meet the following safety requirements:
To provide protection from shock hazards, an enclosure should be provided that surrounds
all live parts.
Nonconductive enclosures must be constructed of materials that are suitably rated for
flammability and the voltage and temperature requirements of the test circuit. Connect the
enclosure of all metal test fixtures to protective earth (safety ground) (see your specific test
fixture for information). Nonconductive test fixtures must be rated to double the maximum
capability of the test equipment in the system.
For metallic enclosures, the test fixture chassis must be properly connected to protective
earth (safety ground). A grounding wire (#16 AWG or larger) must be attached securely to
the test fixture at a screw terminal designed for safety grounding. The other end of the
ground wire must be attached to a known protective earth (safety ground).
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