curvestream ¶

The curvestream commands module.

These commands are used in the following models: DPO5K, DPO5KB, DPO70KC, DPO70KD, DPO70KDX, DPO70KSX, DPO7K, DPO7KC, DSA70KC, DSA70KD, MSO5K, MSO5KB, MSO70KC, MSO70KDX

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Commands and Queries

- CURVEStream {<Block>|<asc curve>}
- CURVEStream?

Curvestream ¶

Bases: SCPICmdWrite, SCPICmdRead

The CURVEStream command.

Description

This query continuously transfers waveform data from the instrument as it is acquired. This command puts the instrument into a talk-only mode, allowing the controller to receive waveform records as fast as (and as soon as) they are acquired. Use the DATA:SOURCE command to specify the waveform sources. The command does the same thing as the CURVE command. Control of the instrument through the user interface or other external client is not possible while in streaming mode. The GPIB controller must take the instrument out of this continuous talking 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 curve mode: send a device clear over the bus or send another query to the instrument (a MEPE Query Interrupted error will occur, but the instrument will be placed back into its normal talk/listen mode). Turning the waveform screen display mode off (:DISPLAY:WAVEFORM OFF) will increase waveform throughput during streaming mode. While in streaming mode, two extreme conditions can occur. If the waveform records are being acquired slowly (high resolution), configure the controller for long time-out thresholds, 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.

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.
Using the .write(value) method will send the CURVEStream value command.

SCPI Syntax

- CURVEStream {<Block>|<asc curve>}
- CURVEStream?