Engineering Design NIDisk Podręcznik Użytkownika Pobierz pdf (Strona 23)

DartDisk User Guide

Noise (re max signal level) n/s

THD -80 dB

Input/output characteristics

No. sample rates 8

Available sample rates

7350, 8820, 11025, 14700, 17640, 22050, 29400, 44100 Hz [44.1 kHz]

8000, 9600, 12000, 16000, 19200, 24000, 32000, 48000 Hz [48 kHz]

8333, 10000, 12500, 16667, 20000, 25000, 33333, 50000 Hz [50 kHz]

Absolute (damaging) signal level

± 2.5 Volts

Maximum signal length Limited by physical disk size

Digitizing resolution 16-bit = 96 dB

Converter type Delta-sigma 64X

Anti-alias filter Built-in tracking

n/a = not applicable, n/s = not specified

Maximum Input and Output Levels

Full-scale input level is the input voltage which drives the card to its maximum digital value

(e.g., 0x7FFF hexadecimal for a positive voltage to a 16-bit card). Conversely, the full-scale

output level is the output voltage produced when the card processes its maximum digital

value. "Technical Specifications" specifies full-scale levels for the Dart.

During acquisition, input voltages beyond the full-scale input level will be truncated or

"clipped" by the card. For example, the figure shows a 1.6 Volt peak signal, as digitized by

a Dart card with a full-scale input level of 1.4 Volts. All digitized voltages are truncated at

1.4 Volts.

During playback, signals beyond the full-scale output level drive the card into a more

disastrous form of overload, in which voltages are reflected about the voltage limits. The

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Engineering Design NIDisk Podręcznik Użytkownika Strona 23