Section 2: General operation Model 2651A High Power System SourceMeter® Instrument Reference Manual
2-68 2651A-901-01 Rev. A / March 2011
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. The following table describes
these interactions:
If... Then... Notes
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.
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.
Model 2651A example:
smua.source.func = smua.OUTPUT_DCVOLTS
smua.source.rangev = 1
smua.measure.rangev = 10
-- will print 1, to match source range
print(smua.measure.rangev)
smua.source.func = smua.OUTPUT_DCAMPS
-- will print 10, the user's range
print(smua.measure.rangev)
A source or
measurement range
for a function is
explicitly set
Autoranging for that
function is disabled.
Autoranging is controlled separately for each source and
measurement function: source voltage, source current,
measure voltage, and measure current. Autoranging is
enabled for all four by default.
The range is changed
with the output off
Hardware settings will
not be updated.
Querying will return the range setting that will be used once
the output is turned on.
The range is changed
with the output on
The new setting will
take effect
immediately.
N/A
Source autoranging is
enabled
The unit will not return
an error until the
output is turned on.
When the output is turned on, the display will show a series of
question marks: ???.???
Measure autoranging
is enabled
Range is changed
only when a
measurement is
taken.
Querying the range after the measurement is taken will return
the range that the unit chose.
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