Range - Tektronix KEITHLEY SourceMeter 2606B Reference Manual

Model 2606B System SourceMeter® Instrument Reference Manual

Range

The selected measurement range affects the accuracy of the measurements and the maximum signal
that can be measured. If the range is changed, the virtual front-panel display may contain dashes
instead of a reading (for example, --.---- mA). This indicates that no measurement was made using
the range that is presently selected. To update the displayed reading, trigger a measurement (if in
local control, press the TRIG key).
Refer to the specifications for available ranges.
Maximum source values and readings
The full-scale output for each voltage and current source range is 101 percent of the selected range,
but the full-scale measurement is 102 percent of the range. For example, ±1.01 A is the full-scale
source value for the 1 A range, and ±102 mA is the full-scale reading for the 100 mA measurement
range. Input levels that exceed the maximum levels cause the overflow message to be displayed. The
instrument autoranges at 100 percent of the range.
Measure autodelay
The measure delay is a specific delay that is applied before each measurement is made. This delay is
disabled by default (measurements are made immediately). You can change the default delay by
setting the smuX.measure.delay
autodelay setting (set smuX.measure.delay = smuX.DELAY_AUTO). If the measure delay is set to
the autodelay setting, a range-dependent delay is applied each time the instrument makes a current
measurement. This delay also happens for the measurement that is made after changing current
ranges during an autoranged measurement.
You can increase or decrease the autodelay by changing the delay factor (for example, to reduce the
delay across all ranges by half, set smuX.measure.delayfactor = 0.5). For additional information,
refer to smuX.measure.delayfactor
Ranging limitations
If the source and measure functions are different (such as source V and measure I, or source I and
measure V), you can set source and measure ranges separately. If both source and measure
functions are the same, the measure range is locked to the source range.
With the 20 V range selected for the voltage source, the highest current measurement range is 1 A.
With the 3 A range selected for the current source, the highest voltage measurement range is 6 V.
Refer to Operating boundaries
2606B-901-01 Rev. C November 2021
(on page 15-216) attribute either to a specific value or to an
(on page 15-217).
(on page 8-3) for power derating information.
Section 5: Sourcing and measuring
5-29