34410A/11A/L4411A User’s Guide 57
Features and Functions 2
Auto Zero
Auto zero is selectable for dc voltage, dc current, 2–wire resistance, and 2-wire
temperature measurements only. Auto zero is always enabled for 4–wire resistance or
4–wire temperature measurements.
When auto zero is ON (default) the multimeter internally disconnects the input signal
immediately following each measurement, and takes a zero reading. It then subtracts the
zero reading from the preceding measurement. This method prevents small offset
voltages present on the multimeter’s input circuitry from affecting measurement
accuracy.
When auto zero is OFF, the multimeter takes one zero reading and subtracts it from all
subsequent measurements. A new zero reading is taken each time you change the
function, range or resolution (integration time).
When auto zero is set to ONCE, the multimeter takes one zero reading, then sets auto
zero to OFF. The zero reading taken is used for all subsequent measurements until the
next change to the function, range or integration time. If the selected integration time is
less than 1 PLC, the zero reading is taken at 1 PLC to ensure normal mode noise
rejection in the zero reading; then subsequent readings are taken at the set integration
time.
• Front Panel Operation: Select a supported function. Press as required.
...
> AUTO ZERO
Select OFF, ONCE, or ON, and then step through or exit the menu.
• Remote Interface Operation: The following command enables or disables auto
zero:
SENSe:
<function>
:ZERO:AUTO {OFF>ONCE>0>ON>1}
where <
function
> = VOLTage:DC, CURRent:DC, RESistance, or
TEMPerature.
Auto zero may be also set indirectly using the CONFigure or MEASure commands.
The following command queries the auto zero feature status:
SENSe:
<function>
:ZERO:AUTO?
This query command returns “0” (OFF) or “1” (ON).
Refer to the Keysight 34410A/11A/L4411A Programmer’s Reference Help for
a complete description and syntax for these commands.
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