Single Point Acquisitions

NI Digital Multimeters Help (NI-DMM 18.1)

Edition Date: March 2018

Part Number: 370384V-01

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A single point acquisition allows you to acquire a single measurement within a configuration. To configure a single point acquisition, use niDMM Config Measurement, which configures the DMM for a single point acquisition by default. The niDMM Config Measurement function allows you to configure the function, range, and resolution. Refer to Configuring the Hardware for more information.

Initiate a single point acquisition by calling either niDMM Initiate or niDMM Read. The DMM enters the Wait-for-Trigger state after niDMM Initiate is called. After taking the measurement, the DMM can generate a Measurement Complete signal. The DMM then returns to the Idle state. The figure below demonstrates the sequence of a single point acquisition.

Note  niDMM Read combines niDMM Initiate and niDMM Fetch into one call. Refer to Acquiring Data for more information.

During a single point acquisition, you can configure the DMM to wait for a trigger before taking a measurement. You can also specify a delay between when the DMM receives the trigger and when it acquires the measurement. Use niDMM Configure Trigger to set the Trigger Source and Trigger Delay.

By default, the Trigger Delay is Auto Delay (-1), which means the DMM waits an appropriate settling time before taking the measurement. The following table contains additional information about the Trigger Delay setting for the DMMs:

Device Description
NI 4060If Trigger Delay is set to 0, the DMM does not settle before taking the measurement.
NI 4065
NI 4070/4071/4072
NI 4080/4081/4082
The DMM uses the value specified in Trigger Delay as additional settling time as demonstrated in the Acq One Sample-Ext Trig example.
Note  If you do not configure a trigger source, Immediate is used as the default setting. To determine which values are supported by each device, refer to the LabVIEW Trigger Routing section.

Related Topics

LabWindows/CVI Trigger Routing

LabVIEW Trigger Routing

Scanning Switch Modules


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