curvestream ¶

The curvestream commands module.

These commands are used in the following models: DPO7AX, LPD6, MSO4, MSO4B, MSO5, MSO5B, MSO5LP, MSO6, MSO6B

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Commands and Queries

- CURVEStream?

Curvestream ¶

Bases: SCPICmdRead

The CURVEStream command.

Description

This query-only command continuously transfers waveform data from the instrument as it is acquired. This command puts the instrument into a streaming data mode, allowing the controller to receive waveform records as fast as they are acquired. Use the DATa:SOUrce command to specify the waveform sources. The command supports all the same data formatting options as the CURVe? command. Control of the instrument through the user interface or other external clients is not allowed while in streaming data mode. The GPIB controller must take the instrument out of this streaming data mode to terminate the query and allow other input sources to resume communication with the instrument. The following options are available to transition out of streaming data mode: Send a device clear over the bus Send another command or query to the instrument Turning the waveform screen display mode off (:DISplay:WAVEform OFF) may increase waveform throughput during streaming mode. Using a data encoding of SRIbinary (DATa:ENCdg SRIbinary) may also increase the waveform throughput since that is the raw native data format of the oscilloscope. While in streaming data mode, two extreme conditions can occur. If the waveform records are being acquired slowly (high resolution), configure the controller for a long time-out threshold, as the data is not sent out until each complete record is acquired. If the waveform records are being acquired rapidly (low resolution), and the controller is not reading the data off the bus fast enough, the trigger rate is slowed to allow each waveform to be sent sequentially Note:. Curve data is transferred from the instrument asynchronously and,depending upon the length of the curve record, such transfers can require severalseconds to complete. During this time, the instrument will not respond to usercontrols. You can interrupt these asynchronous data transfers by sending adevice clear message to the instrument or by interrupting the query with anothercommand or query. Verify that curve data is completely transferred.

Usage

Using the .query() method will send the CURVEStream? query.
Using the .verify(value) method will send the CURVEStream? query and raise an AssertionError if the returned value does not match value.

SCPI Syntax

- CURVEStream?