S540 Power Semiconductor Test System Administrative Guide
Section 3: Equipment startup
S540-924-01 Rev. D / January 2019
3-11
LO patch panel
The S540 must have a single, direct connection between instrument lows and protective earth (safety
ground). The S500-LOPATCH-3KV panel provides this common LO connection and protective earth
(safety ground) reference.
Figure 45: S500-LOPATCH-3KV
The LO patch panel provides:
A common reference point for all the instrument low-side connections
In 4-wire systems, a common connection for the sense low terminals of the source-measure units
(SMUs)
Connections from low to sense low using a 100 kΩ resistor to enable autosensing
Prober safety
Hazardous voltages may be present on the probe card adapter, even after you disengage the
interlock. Cables can retain charges after the interlock is disengaged, exposing you to live
voltages that, if contacted, may cause personal injury or death.
Never attempt to touch or change a probe card when tests are running. You must be
absolutely certain that all tests have stopped before making contact with anything in the
vicinity of the probe card adapter. Also, never run tests without a probe card installed.
