Section 2: Connections and configuration
Model 4200A-SCS Source-Measure Unit (SMU) User's Manual
2-20
4200A-SMU-900-01 Rev. A December 2020
Test fixture and device under test (DUT) connections
The recommended Keithley Instruments test fixture to use with the 4200A-SCS is the Model 8101-PIV
Test Fixture.
Test fixtures for the 4200A-SCS can be:
•
Low-voltage fixtures (less than ±20 V).
•
High-voltage fixtures (greater than ±20 V), which require extra precautions to ensure there are no
dangerous shock hazards.
To avoid high voltage exposure that could result in personal injury or death, whenever the
interlock of the 4200A-SCS is asserted, the FORCE and GUARD terminals of the SMUs and
preamplifier should be considered to be at high voltage, even if they are programmed to a
nonhazardous voltage current.
Testing with less than ±20 V with SMUs
For testing discrete devices, you need a test fixture equipped with three-lug triaxial connectors. This
allows the 4200A-SCS to be connected to the discrete device.
The following figure shows a basic test fixture to test a two-terminal device.
Figure 25: Typical test fixture
For best performance when testing with less than ±20 V, follow these standard industry practices:
•
Use a metal test fixture
•
Connect the metal fixture to COMMON
•
Mount the DUT on high-
resistivity terminals (for example, Teflon™)
•
Use guarding to reduce leakage and parasitic capacitance that degrades measurement quality
