Smu.source.range - Keithley 2450 Reference Manual

Model 2450 Interactive SourceMeter® Instrument Reference Manual

smu.source.range

This attribute selects the range for the source for the selected source function.
Type TSP-Link accessible
Attribute (RW) Yes
Usage
rangeValue = smu.source.range
smu.source.range = rangeValue
rangeValue
Details
This command manually selects the measurement range for the specified source.
If you select a specific source range, the range must be large enough to source the value. If not, an overrange
condition can occur.
If an overrange condition occurs, an event is displayed and the change to the setting is ignored.
The fixed current source ranges are 10 nA, 100 nA, 1 µA, 10 µA, 100 µA, 1 mA, 10 mA, 100 mA, and 1 A.
The fixed voltage source ranges are 20 mV, 200 mV, 2 V, 20 V, and 200 V.
When you read this value, the instrument returns the positive full-scale value that the instrument is presently
using.
This command is intended to eliminate the time required by the automatic range selection.
To select the range, you can specify the approximate source value that you will use. The instrument selects the
lowest range that can accommodate that level. For example, if you expect to source levels around 50 mV, send
0.05 (or 50e-3) to select the 200 mV range.
If automatic range selection is set to on, when you select a specific range, automatic is set to off. To
set the range to automatic selection, use the source autorange command.
Example
smu.source.func = smu.FUNC_DC_CURRENT
smu.source.autorange = smu.OFF
smu.source.range = 1
Also see
Ranges (on page 2-101)
smu.source.autorange
2450-901-01 Rev. B/September 2013
Affected by
Restore configuration
Instrument reset
Power cycle
Source configuration list
Function change
Set to the maximum expected voltage or current to be sourced; see Details for
values; the ranges are:
Current: −1 A to 1 A
•
Voltage: −200 V to 200 V
•
(on page 8-127)
Section 8: TSP command reference
Where saved Default value
Configuration script Current: 1e-08
Source configuration list Voltage: 20 mV
Set the instrument to source current.
Turn autorange off.
Set the source range to 1 A.
8-143