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Model 4200A-SCS Source-Measure Unit (SMU) User's Manual
Section 3: Setting up SMUs in Clarius
4200A-SMU-900-01 Rev. A December 2020
3-27
Stop (step)
The current or voltage that is forced for the last step value.
Stop (sweep)
The voltage or current source level at which the sweep stops. For a log sweep, the stop value cannot
be 0 or the opposite polarity of the start value.
Voltage (Report Voltage)
When this box is selected, the instrument measures voltage. Voltage is recorded in the Analyze sheet
and shown in the graph.
Voltage Range
The measure range determines the full-scale measurement span that is applied to the signal. It
affects both the accuracy of the measurements and the maximum signal that can be measured.
The measurement range options are:
•
Auto:
The instrument automatically optimizes the measurement range as the test progresses.
This option provides the best resolution when the measurements span several decades. However,
range-change time delays limit the measurement speed.
•
Best Fixed:
The instrument automatically selects a single measurement range based on the
current or voltage compliance value.
•
Specific ranges:
You can select a fixed measurement range from a list.
SMU Test Settings
The settings that are available for SMU tests are described in the following topics.
Speed
The SMU automatically takes into account both settling time and noise issues. It provides
measurement speeds that allow you to select a compromise between speed and noise. You can
select:
•
Fast:
Optimizes the SMU for speed at the expense of noise performance. It is a good choice for
measurements where noise and settling time are not concerns.
•
Normal:
The default and most commonly used setting. It provides a good combination of speed
and low noise and is the best setting for most cases.
•
Quiet:
Optimizes the SMU for low-noise measurements at the expense of speed. If speed is not a
critical consideration, it is a good choice when you need the lowest noise and most accurate
measurements.
•
Custom:
Allows you to fine-tune the timing parameters. With Custom, you can configure the A/D
aperture time and individual delay and filtering factors to produce a composite setting that is
faster than the Fast setting, quieter than the Quiet setting, or anything in between.