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DartDisk User Guide

4. Acquisition

Performing Acquisition

To perform an acquisition, select I/O | Acquire on the DartDisk menu. DartDisk displays the

Acquisition parameter screen, which allows the user to configure the acquisition. DartDisk

then displays the Acquisition summary screen, which summarizes acquisition parameters and

allows the user to initiate the acquisition.

Acquisition Parameter Screen

The Acquisition parameter screen allows the user to specify acquisition duration, sample rate,

input gain, number of channels, the name or prefix, file type, and channel format of the

datafile to receive the acquired data, optional overwrite of pre-existing datafiles and optional

alarm sounds. These are described here.

Duration is specified in seconds, and is limited only by the available space on the destination

disk drive. Note: DartDisk does not check for sufficient disk space for your requested

duration. Acquisition length in seconds is related to disk space in MB as follows. For

example, at 50 kHz sample rate, 30 minutes of sound will require 170 MB of disk space.

Disk space in MB = (Acquisition length in secs) * (sample rate in Hz) * (no. channels)

/ 525,000

Sample rate is selected from the drop list of available sample rates in Hz. See "Sample rate

selection" below for a list of available sample rates.

Gain specifies the gain applied to the input signal before digitizing, and is specified in dB. It

is selected from the drop list of available gains, which range from 0 to 22.5 dB in 1.5 dB

increments.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 28 29

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Engineering Design NIDisk Podręcznik Użytkownika Strona 10