RIGOL DM3068 - Manual (Page 85)

Chapter 2 Front Panel Operations RIGOL
User’s Guide for DM3068 2-43
Auto Zero
Auto zero (Auto Zero) applies to DCV, DCI, 2WR and 4WR measurements.
Press
 AZ to enter the following interface.
 ON: the multimeter internally disconnects the input signal and measured
circuit after each measurement, and takes a zero reading. It then subtracts
the zero reading from the preceding reading (displaying the difference
between the measurement value and zero value during the measurement), in
order to reduce the impact of offset voltage from input circuit on
measurement result.
 Once: the multimeter takes a zero reading and then disables the auto zero.
The multimeter will subtract this zero reading from the following
measurement value.
 OFF: disable the auto zero function. Whatever, the multimeter automatically
takes a zero reading once the function, range or integration time is changed.
The multimeter will subtract this zero reading from the following
measurement value.