Keithley SourceMeter 2600 Series Reference Manual page 180

6-4 Range, Digits, Speed, Rel, and Filters
Low range limits
The low range limits set the lowest range the Series 2600 will use when auto
ranging is enabled. This feature is useful for minimizing auto range settling times
when numerous range changes are involved.
Low range limits can be individually set for Source V, Source I, Measure V, and
Measure I as follows:
1.
2.
3.
4.
5.
Range considerations
The source range and measure range settings can interact depending on the
source function. Additionally, the output state (on/off) can affect how the range is
set.
If the source function is the same as the measurement function (for example,
sourcing voltage and measuring voltage), the measurement range is locked to be
the same as the source range. However, the setting for the voltage measure
range is retained and used when the source function is changed to current, and
the present voltage measurement range will be used.
2601/2602 Example:
smua.source.func = smua.OUTPUT_DCVOLTS
smua.source.rangev = 1
smua.measure.rangev = 6
print(smua.measure.rangev)
smua.source.func = smua.OUTPUT_DCAMPS
print(smua.measure.rangev)
Explicitly setting either a source or measurement range for a function will disable
auto ranging for that function. Autoranging is controlled separately for each
source and measurement function: source voltage, source current, measure volt-
age and measure current. Auto ranging is enabled for all four by default.
Changing the range while the output is off will not update the hardware settings,
but querying will return the range setting that will be used once the output is
turned on. Setting a range while the output is on will take effect immediately.
2600S-901-01 Rev. A / May 2006
Press the CONFIG key, then press either SRC for source or MEAS for
measure.
Choose voltage or current source, or measure as appropriate, and then
press ENTER or the Rotary Knob.
Choose LOWRANGE, then press ENTER or the Rotary Knob.
Set the low range to the desired setting, and then press ENTER or the
Rotary Knob.
Use EXIT to back out of the menu structure.
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Series 2600 System SourceMeters Reference Manual
-- will print 1, to match source range
-- will print 6, the user's range
Section 6 topics