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.

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