Model 2450 Interactive SourceMeter® Instrument Reference Manual
Section 2: General operation
2450-901-01 Rev. B/September 2013
2-103
Using TSP commands:
To set the current source range, send the following commands, with
rangeValue
set to the source
range:
smu.source.func = smu.FUNC_DC_CURRENT
smu.source.range =
rangeValue
To set the voltage source range, send the following commands, with
rangeValue
set to the source
range:
smu.source.func = smu.FUNC_DC_VOLTAGE
smu.source.range =
rangeValue
Selecting the automatic source range
When the automatic range is selected, the source-measurement cycle is repeated to determine the
correct range. This means that any source delay is applied each time the instrument has to set the
automatic range. For example, if you program a one-second source delay, the instrument could take
two or more seconds to complete a reading if it must change ranges.
The instrument changes ranges as follows:
1. If the reading reaches 105% of the present range, the instrument goes up three ranges or to the
highest range possible.
2. The instrument takes another reading.
3. The instrument uses this reading to determine whether it needs to continue going up in range or if
it picks the range based on the reading. If the reading is 10%, 1%, or 0.1% of the present range, it
will go down by 1, 2, or 3 ranges, respectively.
Using the front panel:
1. Press the
HOME
key.
2. Under SOURCE, select the button next to Range. The Select Range dialog box is displayed.
3. Select
AUTO
. You are returned to the Home screen.
Using SCPI commands:
To set the current source range, send the command:
SOURce:CURRent:RANGe:AUTO ON
To set the voltage source range, send the command:
SOURce:VOLTage:RANGe:AUTO ON
Using TSP commands:
To set the source range when current is sourced, send the following commands:
smu.source.func = smu.FUNC_DC_CURRENT
smu.source.autorange = smu.ON
To set the source range when voltage is sourced, send the following commands, with
rangeValue
set to the source range:
smu.source.func = smu.FUNC_DC_VOLTAGE
smu.source.autorange = smu.ON
