Noise Spectrum - Benchmark PRE420 Instruction Manual

Noise Spectrum

32k B-H FFT, Gain = 60 dB, 0 dBr = 0 dBu at input
Audio Precision
dx=120.996 Hz
+0
-10
-20
-30
-40
-50
-60
-70
-80
-90
d
B
-100
r
A
-110
-120
-130
-140
-145.066
-150
-149.014
-160
-170
-180
-190
-200
10 20
Sweep Trace Color
1 1 Red
The above graph demonstrates that the PRE420 is free of hum and noise. The highest tone is 60-
Hz line-related hum and is at a level equivalent to an input level of -145 dBu. 180-Hz hum is at an
equivalent input level of -149 dBu.
PRE420 Instruction Manual – rev. E
Noise Spectrum, Gain = 60 dB, 0 dBr = 0 dBu at Input
dy=-3.948 dB
59.6606 180.657
50 100 200
Line Style Thick Data Axis
Solid 4 Fft.Ch.1 Ampl Left
500 1k
Hz
Comment Cursor1 Cursor2
*-145.066 dBr A *-149.014 dBr A
02/19/07 11:27:19
2k 5k 10k 20k 30k
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