Test fixture
You can use a test fixture to house a device or test circuit. The test fixture can be a metal or
nonconductive enclosure and is typically equipped with a lid and an interlock switch. When properly
used, the output of the 2601B-PULSE turns 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).
Construction material: A metal test fixture must be connected to a known protective earth (safety
ground) as described in the above warning. A nonconductive test fixture must be constructed of
materials that are suitable for flammability, voltage, and temperature conditions that may exist in the
test circuit. The construction requirements for a nonconductive enclosure are also described in the
warning above.
Test circuit isolation: With the lid closed, the test fixture must completely surround the test circuit. A
metal test fixture must be electrically isolated from the test circuit. Input and output connectors
mounted on a metal test fixture must be isolated from the test fixture. Internally, Teflon
TM
standoffs
are typically used to insulate the internal printed circuit board or guard plate for the test circuit from a
metal test fixture.
Interlock switch: The test fixture must have a normally-open interlock switch. The interlock switch
must be installed so that when the lid of the test fixture is opened, the switch opens, and when the lid
is closed, the switch closes.
The 2601B-P-INT Interlock and Cable Connector Box provides an interlock option. When properly
used with a test fixture, when the lid of the test fixture is opened, the FORCE HI and FORCE LO
terminals are shorted and the output of the 2601B-PULSE turns off.
See Using the interlock (on page 2-37) for information on setting up the interlock.
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