Read Operation

The Read operation initiates an acquisition and retrieves the measured value(s) from a previously started acquisition for the listed channels. Read initiates a new measurement on all channels. You can obtain data from multiple channels or different types of data from a single channel based on a single trigger condition.

The returned value is either the actual reading, in units the Waveform Type defines, or a value that indicates that an over-range condition occurred. When an over-range condition occurs, the reading parameter contains an IEEE-defined not a number (NaN) value. To test a value for the over-range condition, enable the Set Status if Over-Range control. If a timeout occurs before the Read operation completes, the Set Status on Timeout control determines the step status .

The Edit IVI Scope Step dialog box for the Read operation contains the following tabs:

• Channels —Specifies which channels to read, the type of data to retrieve, and where to store the data.
• Operation Settings —Specifies where the dialog box saves and reloads the operation settings.