Smu.measure.autozero.enable - Keithley 2461 Reference Manual

Section 8: TSP command reference

smu.measure.autozero.enable

This attribute enables or disables automatic updates to the internal reference measurements (autozero) of the
instrument.
Type TSP-Link accessible
Attribute (RW) Yes
Usage
state = smu.measure.autozero.enable
smu.measure.autozero.enable = state
state
Details
To ensure the accuracy of readings, the instrument must periodically get new measurements of its
internal ground and voltage reference. The time interval between updates to these reference
measurements is determined by the integration aperture that is being used for measurements. The
Model 2461 uses separate reference and zero measurements for each aperture.
By default, the instrument automatically checks these reference measurements whenever a signal
measurement is made.
The time to make the reference measurements is in addition to the normal measurement time. If
timing is critical, such as in sweeps, you can disable autozero to avoid this time penalty.
When autozero is set to off, the instrument may gradually drift out of specification. To minimize the
drift, you can send the once command to make a reference and zero measurement immediately
before a test sequence.
Example
smu.measure.func = smu.FUNC_DC_VOLTAGE
smu.measure.autozero.enable = smu.OFF
Also see
smu.measure.autozero.once()
smu.measure.nplc
8-134
Model 2461 Interactive SourceMeter® Instrument Reference Manual
Affected by
Restore configuration
Instrument reset
Power cycle
Measure configuration list
Function change
The status of autozero; set to one of the following values:
Disable autozero: smu.OFF
•
Enable autozero: smu.ON
•
(on page 8-135)
(on page 8-164)
Where saved
Configuration script
Measure configuration list
Set autozero off for voltage measurements.
Default value
smu.ON
2461-901-01 A/November 2015