Keithley SourceMeter 2600 Series Reference Manual page 181

Series 2600 System SourceMeters Reference Manual Range, Digits, Speed, Rel, and Filters 6-5
With source auto ranging enabled, the output level controls the range. Querying
the range after the level is set will return the range the unit chose as appropriate
for that source level.
The SourceMeter allows you to send ICL command values that may be out of
range when auto range is off. An example is sending 1A on the 100mA range. The
unit does not error check until the output is turned on. In this situation, the display
will show a series of question marks:???.???.
With measure auto ranging enabled, the range will be changed only when a
measurement is taken. Querying the range after a measurement will return the
range selected for that measurement.
Range programming
Range commands
Table 6-2 summarizes the commands necessary to control measure and source
ranges. See Section 12 for more details on these commands.
Return to Section 6 topics 2600S-901-01 Rev. A / May 2006