Benchmark DAC1 HDR Bedienerhandbuch PDF herunterladen (Seite 43)

DAC2 Series Instruction Manual Rev C Page 43

A

udio Precision DAC2 - FFT 1 kHz, 0 dBr = 0 dBFS = 23 dBu

DAC2 - FFT 1 kHz.at27

ColorSweep Trace Line Style Thick Data Axis Comment Cursor1 Cursor2

1 1 Green Solid 4 Fft.Ch.1 Ampl Left *-115.268 dBr *-128.290 dBr

1 2 Red Solid 4 Fft.Ch.2 Ampl Right -115.954 dBr A -130.429 dBr A

-160

+0

-140

-120

-100

-80

-60

-40

-20

d

B

r

A

-160

+0

-140

-120

-100

-80

-60

-40

-20

-115.268

-128.29

d

B

r

A

0 3.2k200 400 600 800 1k 1.2k 1.4k 1.6k 1.8k 2k 2.2k 2.4k 2.6k 2.8k 3k

2.00391k 2.99961k

Hz

dx=.995695 kHz d

y

=-13.022 dB

Graph Plot 4 - FFT 1 kHz

The 1 kHz FFT analysis demonstrates the low harmonic distortion of the DAC2. Second harmonic

distortion (2 kHz) measures about -115 dB, while 3rd harmonic distortion measures -128 to -130

dB.

The rise at 0 Hz is normal in an FFT analysis and is not an indication of noise. This 32k point FFT

analysis uses a Blackman-Harris window with 16x power averaging, and spans a frequency range

of DC to 32 kHz.

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