Initialize External Calibration

Creates a new session for external calibration to a specified DMM.

Refer to the calibration procedure for your device before running this node.

This node resets the DMM and prepares the EEPROM for new calibration coefficients.

This node creates a new session the first time you call it for a DMM. If you run this node a second time on the same DMM, an error is returned. Use Close External Calibration to close a session obtained using this node.

Inputs/Outputs

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resource name

Resource name of the device to initialize.

The resource name is assigned in NI MAX.

Examples

The following examples are valid syntax for this parameter:

  • NI-DAQmx name
  • DAQ::NI-DAQmx name[::INSTR]
  • IVI logical name
Caution All IVI names for the resource name, such as logical names or virtual names, are case-sensitive. If you use logical names, driver session names, or virtual names in your program, you must make sure that the name you use matches the name in the IVI Configuration Store file exactly, without any variations in the case of the characters in the name.
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calibration password

Password required to enable external calibration functionality.

The factory default password is "NI".

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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

Default value: 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

Measuring With an Open Calibration Session

After opening a calibration session, the DMM cannot take valid measurements using this session until the DMM has been properly adjusted. Once the adjustment phase is complete, you can use this session to verify the new calibration constants. After verification, you have the option of saving the new calibration constants or reverting to the previous calibration constants by specifying the Action parameter in Close External Cal.

If you encounter a fatal error such as a power failure or system crash while performing an external calibration, you can run Restore Last External Cal Constants to return the device to a usable state.