Fetch (Multi Waveform » 2D DBL) (G Dataflow)

Handle that identifies the NI-SCOPE instrument session as previously allocated by Initialize With Options .

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error	error in contains an error
If no error occurred before the node runs, the node begins execution normally. If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.	If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

The channel(s) from which to acquire data.

Channel String Syntax

This input parameter has the following syntax options:

• A single channel, such as 0
• A list of channels, such as 0,1 or 3,2,1,0
• A range of channels, such as 0-7 or 0:7
• A combination of channels from multiple instruments, such as PXI1Slot3/0,PXI1Slot3/2-3,PXI1Slot4/2-3

Note

The order of channels in a list is important. The data for each channel is returned in the order the channels occur in the list.

The maximum number of samples to fetch for each waveform.

This function reads the actual record length and attempts to acquire all available samples. If the function fails to complete within the timeout period, the function returns an error. If the acquisition finishes with fewer points than requested, some devices return partial data if the acquisition finished, was aborted, or a timeout of 0 was used.

Default: -1

The time, in seconds, to wait for the data to be acquired.

Default: 5

Reference to the NI-SCOPE instrument session to pass to the next node in the program.

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error	error in contains an error
If no error occurred before the node runs, the node begins execution normally. If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.	If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

A two-dimensional array of waveforms.

The 2D array includes waveforms from multiple channels, records, and acquisition types. For example, if the acquisition type is normal, there is one waveform per channel per record. For example, if the acquisition type is normal, there is one waveform per channel per record. If you call Fetch during a normal acquisition with the channel string "0,1" and the record number set to -1, the order of the output is:

record 0, channel 0

record 0, channel 1

record 1, channel 0

record 1, channel 1

The order of the channels is the order specified by the channels parameter.

The timing and scaling information about the waveform.

actualSamples

The actual number of samples in the acquired waveform.

Note

The number returned in actualSamples may be less than numSamples if the number you request is not available.

absoluteInitialX

The timestamp, in seconds, of the first fetched sample. This timestamp is comparable between records and acquisitions; devices that do not support this parameter use 0 for this output.

relativeInitialX

The time, in seconds, from the trigger to the first sample in the acquired waveform.

xIncrement

The time, in seconds, between two samples in the acquired waveform.

offset

The offset factor of the given channel. Use for scaling binary data with the following formula: voltage = binary data x gain factor + offset

gain

The gain factor of the given channel. Use for scaling binary data with the following formula: voltage = binary data × gain factor + offset.

reserved1

A reserved value. Do not use.

reserved2

A reserved value. Do not use.