2470 High Voltage SourceMeter Instrument Reference Manual
Section 14: TSP command reference
2470-901-01 Rev. A /
May
2019
14-113
smu.measure.autozero.enable
This attribute enables or disables automatic updates to the internal reference measurements (autozero) of the
instrument.
Type
TSP-Link accessible
Affected by
Where saved
Default value
Attribute (RW)
Yes
Restore configuration
Instrument reset
Power cycle
Measure configuration list
Function change
Configuration script
Measure configuration list
smu.ON
Usage
state
= smu.measure.autozero.enable
smu.measure.autozero.enable =
state
state
The status of autozero; set to one of the following values:
Disable autozero:
smu.OFF
Enable autozero:
smu.ON
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
2470 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
Set autozero off for voltage measurements.
Also see
(on page 14-114)
