6 - Getting Started
Selecting a Range
23
SMU4000 Series Instruction Manual
Selecting a Range
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Ranges
Before considering a range selection it is important to understand the concept of manual setup
modes that are used in the SMU; see ‘
for more details. Configuration settings,
including the selected ranges, are linked to the selected mode of operation.
NOTE
Range selection is ‘
specific.
Ranges can be set for current and voltage, the available ranges are determined by the selected
mode of operation.
A range can be set to
Auto
, or a manual value.
Most applications will require Auto Range, however if high accuracy or speed is required it may
be necessary to select a manual range.
The automatic range selection determines and selects the most suitable ranges based upon the
measured readings and source settings.
Timing considerations
Faster Response Speeds
Selecting a manual range can assist with faster response speed. Auto ranging changes the range
whilst the output is running, this can lead to increased rise/measurement/settling times whilst
the instrument selects the appropriate range; selecting a manual range overcomes this potential
timing penalty.
NOTE
The fastest response speeds can only be achieved when a manual range is selected.
Reduced settling times
Settling times can be reduced when in auto range by selecting a minimum range value. This
defines the minimum range that the instrument can select during auto-ranging. Setting this to
the lowest range that is required for the given test/application may help to reduce the settling
time, as the lower ranges have generally longer settling times.