Section 8: TSP command reference Model 2461 Interactive SourceMeter® Instrument Reference Manual8-134 2461-901-01 A/November 2015smu.measure.autozero.enableThis attribute enables or disables automatic updates to the internal reference measurements (autozero) of theinstrument.Type TSP-Link accessible Affected by Where saved Default valueAttribute (RW) Yes Restore configurationInstrument resetPower cycleMeasure configuration listFunction changeConfiguration scriptMeasure configuration listsmu.ONUsagestate = smu.measure.autozero.enablesmu.measure.autozero.enable = statestate The status of autozero; set to one of the following values:• Disable autozero: smu.OFF• Enable autozero: smu.ONDetailsTo ensure the accuracy of readings, the instrument must periodically get new measurements of itsinternal ground and voltage reference. The time interval between updates to these referencemeasurements is determined by the integration aperture that is being used for measurements. TheModel 2461 uses separate reference and zero measurements for each aperture.By default, the instrument automatically checks these reference measurements whenever a signalmeasurement is made.The time to make the reference measurements is in addition to the normal measurement time. Iftiming 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 thedrift, you can send the once command to make a reference and zero measurement immediatelybefore a test sequence.Examplesmu.measure.func = smu.FUNC_DC_VOLTAGEsmu.measure.autozero.enable = smu.OFFSet autozero off for voltage measurements.Also seesmu.measure.autozero.once() (on page 8-135)smu.measure.nplc (on page 8-164)
