Model 4200A-SCS Parameter Analyzer Reference Manual
Section 2: Connections and configuration
4200A-901-01 Rev. C / February 2017
2-19
Testing with less than ±20 V with SMUs
For testing discrete devices, you need a test fixture equipped with 3-lug triaxial connectors. This
allows the 4200A-SCS to be connected to the discrete device.
The next figure shows a basic test fixture to test a two-terminal device. 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)
•
Guarding will reduce leakage and parasite capacitance that degrades measurement quality
The Keithley Instruments
Low Level Measurements Handbook
provides an in-depth discussion on
guarding and other techniques that are useful for building quality test fixtures. See the
Learning
Center
on your 4200A-SCS for a copy.
Figure 24: Typical test fixture
The 4200A-SCS functions on all current ranges and up to ±20 V without the interlock being asserted.
