User`s guide

56 34410A/11A/L4411A User’s Guide
2Features and Functions
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 Agilent 34410A/11A/L4411A Programmer’s Reference Help for
a complete description and syntax for these commands.
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