[SENSe:]RESistance:ZERO:AUTO
Syntax
[SENSe:]RESistance:ZERO:AUTO <mode> [, (@<ch_list>)]
[SENSe:]RESistance:ZERO:AUTO? [(@<ch_list>)]
Description
This command disables or enables the autozero mode on the specified channels. If you omit the optional <ch_list> parameter, this command applies to the internal DMM, independent of any channels or a scan list.
When autozero is enabled (default), the instrument internally disconnects the input signal following each measurement, and takes a zero reading. It then subtracts the zero reading from the preceding reading. This prevents offset voltages present on the instrument's input circuitry from affecting measurement accuracy.
When autozero is disabled, the instrument takes one zero reading and subtracts it from all subsequent measurements. It takes a new zero reading each time you change the function, range, or integration time.
Used With:
34921A through 34925A Multiplexer Modules
Parameters
|
Name |
Type |
Range of Values |
Default Value |
|
<mode> |
Discrete |
{OFF|ONCE|0|ON|1} |
Autozero ON |
|
<ch_list> |
Numeric |
One or more channels in the form (@sccc). |
If <ch_list> is omitted, this command applies to the internal DMM. |
Remarks
Applies to 2-wire ohms measurements only. Autozero is automatically enabled when you select 4-wire ohms measurements.
The OFF and ONCE parameters have a similar effect. Autozero OFF does not issue a new zero measurement. Autozero ONCE issues an immediate zero measurement.
If you omit the optional <ch_list> parameter, the configuration applies to the internal DMM, independent of any channels or a scan list (any existing scan list is not redefined). An error is generated if the internal DMM is not installed or is disabled.
The autozero mode is set indirectly when you set the resolution and integration time. Autozero is automatically turned off when you select an integration time less than 1 PLC.
The CONFigure and MEASure? commands automatically enable autozero.
The autozero setting is stored in volatile memory and will be enabled (autozero ON) when power is turned off or after a Factory Reset (*RST command).
Return Format
The query command returns "0" (OFF or ONCE) or "1" (ON) for each channel specified. Multiple responses are separated by commas.
Examples
The following command disables autozero on channels 3 and 13 in slot 1. With autozero disabled, a new zero measurement is not issued until the next time the instrument goes to the "wait-for-trigger" state.
RES:ZERO:AUTO OFF,(@1003,1013)
The following query returns the autozero settings on channels 3 and 13 in slot 1.
RES:ZERO:AUTO? (@1003,1013)
Typical Response: 0,0