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 2600B digital I/O port provides an output enable line or an interlock line (dependent on the model
number). When properly used with a test fixture, the output of the 2600B turns off when the lid of the
test fixture is opened. The 2601B, 2602B, and 2604B have output enable (OE) line. The 2611B,
2612B, 2614B, 2634B, 2635B, and 2636B have an interlock.
The digital I/O port of the 2601B, 2602B, or 2604B is not suitable for control of safety circuits
and should not be used to control a safety interlock. The interlock pin on the digital I/O port
for the 2611B, 2612B, 2614B, 2634B, 2635B, or 2636B can be used to control a
safety interlock.
For information on the digital I/O port, see Model Series 2600B Reference Manual, “Digital I/O.”
To Next Page
Loading...
Need help?
General
