Keithley 2461 Reference Manual

Section
8: TSP command reference Model 2461 Interactive SourceMeter® Instrument
Reference Manual
8-208 2461-901-01 A/November 2015
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
Set the instrument to source current.
Turn autorange off.
Set the source range to 1 A.
Also see
Ranges (on page 2-124)
smu.source.autorange (on page 8-175)
smu.source.readback
This attribute determines if the instrument records the measured source value or the configured source value
when making a measurement.
Type TSP-Link accessible Affected by Where saved Default value
Attribute (RW)
Yes
Restore configuration
Instrument reset
Power cycle
Source configuration list
Function change
Configuration script
Source configuration list
smu.ON
Usage
state = smu.source.readback
smu.source.readback = state
state
Disable readback: smu.OFF
Enable readback: smu.ON
Details
When source readback is off, the instrument records and displays the source value you set. When
you use the actual source value (source readback on), the instrument measures the actual source
value immediately before making the device under test measurement.
Using source readback results in more accurate measurements, but also a reduction in measurement
speed.
When source readback is on, the front-panel display shows the measured source value and the buffer
records the measured source value immediately before the device-under-test measurement. When
source readback is off, the front-panel display shows the configured source value and the buffer
records the configured source value immediately before the device-under-test measurement.

Keithley 2461 Specifications

General

Brand	Keithley
Model	2461
Category	Measuring Instruments
Language	English