7½ Digit Graphical Sampling Multimeter Reference Manual Section 8:
DMM7510-901-01 Rev. B / May 2015 8-135
dmm.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
Instrument reset
Power cycle
Measure configuration list
Measure configuration list
dmm.ON
Usage
state = dmm.measure.autozero.enable
dmm.measure.autozero.enable = state
Disable autozero: dmm.OFF
Enable autozero: dmm.ON
Functions
dmm.FUNC_DIGITIZE_CURRENT
dmm.FUNC_DIGITIZE_VOLTAGE
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 DMM7510 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, 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.
For AC voltage and AC current measurements where the detector bandwidth is set to 3 Hz or 30 Hz,
autozero is set on and cannot be changed.
Example
dmm.measure.func = dmm.FUNC_DC_VOLTAGE
dmm.measure.autozero.enable = dmm.OFF
Set autozero off for voltage measurements.
Also see
Automatic reference measurements (on page 2-149)
dmm.measure.autozero.once() (on page 8-136)
dmm.measure.nplc (on page 8-172)
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