Engineering Design NIDisk Podręcznik Użytkownika Pobierz pdf (Strona 22)

DartDisk User Guide

desktop workstation in the lab and in a notebook computer in the field. Contact Engineering

Design for the currently recommended adapter.

Examining DartDisk Output in Signal

By default, DartDisk stores acquired sound files in the directory containing the DartDisk

executable. If in doubt about the location of DartDisk output files, select Search | For Files

and Folders on the Windows Start menu.

10. Technical Notes

Technical Specifications for DartDisk with Dart analog I/O card

Following are technical specifications of the DartDisk program operating with the 50 kHz

Dart PCMCIA analog I/O card. Three sample rate options are available – the standard

maximum sample rate of 50 kHz, and optional maximum sample rates of 44.1 kHz and 48

kHz. The upper frequency limit in "Signal bandwidth" applies to a 50 kHz card, and should

be scaled accordingly for 44.1 kHz and 48 kHz cards.

Input characteristics

Maximum channels 2

Signal bandwidth 20 Hz - 23 kHz, ± 1.5 dB

Low frequency response -4 dB at 8 Hz

-8 dB at 4 Hz

-20 dB at 1 Hz

Programmable gain 0 – 22.5 dB in 1.5 dB steps

Full-scale input level 1.4 Volts typical, 1.5 Volts max

Absolute gain accuracy

± 1.0 dB

Impedance 20 K ohms

DC offset (typical) 3 mV

Noise (re max signal level) -81 dB

THD < -90 dB

Output characteristics

Maximum channels 2

Signal bandwidth 5 Hz - 22 kHz, ± 1.5 dB

Full-scale output level 1.4 Volts typical, 1.55 Volts max

Absolute gain accuracy

± 1.0 dB

Impedance n/s

DC offset (typical) 3 mV

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