6 - Getting Started
Selecting a Range
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SMU4000 Series Instruction Manual
In order to bypass this functionality, simply set the minimum range to the smallest range
available.
To set the minimum range, press the
Auto (Min.Range xxx)
Button. Set the minimum required
range and press
Back
to return to the Range Menu.
Stability Considerations
Auto ranging can, in some specific cases (where there may be a significantly highly reactive load)
lead to potential instability or oscillations. If this occurs, selecting the appropriate manual ranges
can alleviate the issue. When using the most sensitive current ranges i.e.200nA and 2µA ranges
potentially instability could occur, in this case try a higher current range.
Limit considerations
NOTE
The source and limit level settings cannot exceed 105% of the selected associated range. The
limit setting is restricted to a minimum of 10% of the manually selected range.
If a lower manual range is selected that causes the existing source or limit level setting to exceed
the selected range maximum, the associated level is set to 105% of the new range. Likewise, if a
higher manual range is selected that causes the existing limit level setting to exceed the selected
range maximum, the limit level is set to 10% of the new range.
NOTE
In SC and MR modes (see ‘
’ for more details) where the current source is
utilized, the 3A range can only be accessed via manual range selection, the auto current range
will stop at the 1A range.
Noise pickup, leakage and instability issues may arise when testing within certain manual
ranges, see ‘Application notes’ for tips to overcome these issues.