Benchmark DAC1 HDR Instrukcja Obsługi Pobierz pdf (Strona 41)

DAC2 Series Instruction Manual Rev C Page 41

A

udio Precision FFT Idle Channel Noise - Low Frequency, 0 dBr = 0 dBFS = 23 dBu

DAC2 - FFT Idle Channel Noise - Low Frequency.at27

ColorSweep Trace Line Style Thick Data Axis Comment Cursor1 Cursor2

1 1 Green Solid 4 Fft.Ch.1 Ampl Left *-156.413 dBr *-157.539 dBr

1 2 Red Solid 4 Fft.Ch.2 Ampl Right -159.813 dBr A -158.700 dBr A

-160

+0

-140

-120

-100

-80

-60

-40

-20

d

B

r

A

-160

+0

-140

-120

-100

-80

-60

-40

-20

-156.413

-157.539

d

B

r

A

25 400 50 75 100 125 150 175 200 225 250 275 300 325 350 375

60.1566 180.626

Hz

dx=120.470 Hz d

y

=-1.126 dB

Graph Plot 2 - LOW FREQUENCY FFT - AC LINE-RELATED HUM

The DAC2 shows no evidence of AC line-related hum to a measurement limit of -160 dBFS. The

cursors are placed at 60 Hz and 180 Hz (frequencies where we would expect to see interference

from the 60 Hz AC input. There is absolutely no sign of any AC hum.

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