User`s guide

Chapter 2 Front Panel Operations RIGOL
M300 User’s Guide
2-25
Auto Zero
Auto Zero (AZ) is applicable to DCV, DCI, 2WR, 4WR, TEMP (RTD and RTD 4W) and
SENSOR (except FREQ sensor) measurement functions.
When the current function is DCV, DCI, 2WR, 4WR or SENSOR (except FREQ sensor),
enter the fourth step of the channel configuration guide, use the up/down direction
keys to select AZ and the left/right direction keys to select “ON” or “OFF”.
 ON
When auto zero is enabled, the DMM internally disconnects the input signal
following each measurement and takes a zero reading. It then subtracts the zero
reading from the preceding reading (namely, during the measurement, the value
displayed is the difference between the measurement value and zero reading).
This prevents offset voltages on the instrument’s input circuitry from affecting
measurement accuracy.
 OFF
After pressing “OFF”, the auto zero function is disabled. The DMM will still take a
zero reading automatically each time the function, range, or integration time is
changed and the instrument subtracts this zero reading from the succeeding
measurement value.
Tip:
Auto zero and offset compensation are mutually exclusive. After enabling auto zero,
offset compensation (if currently enabled) will be disabled automatically and vice
versa.