Table Of Contents

Configure Auto Zero (G Dataflow)

Last Modified: April 2, 2018

Configures the DMM to compensate for offset voltages on the input circuitry.

When Auto Zero is enabled, the DMM internally disconnects the input and takes a zero reading before each measurement. It then subtracts the zero reading from the measurement.

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session in

Instrument identifier from previous NI-DMM nodes.

Default: None

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auto zero

Setting for Auto Zero.

The following table describes the valid values for this parameter.

Value Setting Description
-1 Auto NI-DMM chooses the Auto Zero setting based on the configured function and resolution.
0 Off Disables Auto Zero.
1 On Enables Auto Zero for each measurement.
2 Once Enables Auto Zero before the next measurement. The Auto Zero value is stored and used in subsequent measurements until the device is reconfigured.

Default: -1 (Auto)

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error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

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session out

Instrument identifier for subsequent NI-DMM nodes.

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application

Hardware Support:

The PCI/PXI-4070, PXI-4071, PXI-4072, PXIe-4080, PXIe-4081, and PXIe-4082 have the following Auto Zero behavior:

  • For 6.5 digit or greater resolution DC measurements, NI-DMM enables Auto Zero for each measurement.
  • For all other DC measurement configurations, NI-DMM enables Auto Zero for one measurement and uses that Auto Zero value for subsequent measurements.
  • For AC measurements or waveform acquisitions, NI-DMM disables Auto Zero.

The PCIe/PXI/PXIe/USB-4065 always uses Auto Zero for each measurement. For these DMMs, Auto Zero is an integral part of the signal measurement phase and adds no extra time to the overall measurement. These DMMs only support the Auto setting for the auto zero parameter.


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