Tektronix 371B User Manual page 66

Operating Basics
Many semiconductor devices do not have standard lead configurations or may be
too large to fit into a test adapter. Patch cords with alligator clips can be used to
connect a DUT directly to the test fixture unit, as described in the following
paragraph.
If the physical shape or operating voltage of the DUT prevents use of a test
adapter, you can easily remove the adapter panel by loosening two thumb screws
and lifting the adapter panel out of the test fixture unit as shown in Figure 2–15.
Now you can connect the device directly to the patch panel as shown in Figure
2–15.
The 371B main unit/test fixture is provided with a safety interlock system that
disables the collector supply voltage whenever the test fixture cover is in the
raised position. Whenever the collector supply voltage is disabled you can safely
connect and disconnect devices at the patch panel.
When the cover is closed, the collector supply voltage is enabled. The enabled
state is indicated by a red WARNING indicator. When lit, the WARNING
indicator indicates that the collector supply is enabled and that a dangerous
voltage may appear at the patch panel terminals on the test fixture unit.
Do not disable the safety interlock and then attempt to operate the
371B. You may accidentally contact high voltage and serious personal injury or
death may result.
The collector supply is also disabled whenever the test fixture unit cable is
disconnected from its connector at the front panel of the main unit.
371B User Manual