
Module 6
Low Current Measurement
6-9
To Get Started:
z Use the next several pages as your guide
z Remove any cable attached to SMU4
z Measure SMU4 noise level using the setup shown
Class Exercise
Measurements Near Zero fA
You will be able to answer the following questions:
z What does a sweep into an open SMU port look like?
z What is the time per meas using PLC integration?
z Add a 1.5 m cable during a sweep...how long to settle?
z Move and bend the cable...how much current flows?
The following pages lead you step-by-step through the "ZERO CHECK" class exercise. This is the
logical place to start if you are debugging a "noisy" test environment.
You will create an algorithm to look at the low level measurement capability of a SMU. On the next
page you will see the expected curve when looking into an open at the rear panel.
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