Benchmark MPA1 Instrukcja Obsługi Strona 25

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PRE420 Instruction Manual – rev. E Page 25
THD Spectrum at 10 KHz
02/19/07 11:09:3010 kHz FFT at 60 dB Gain, Output Level = +24 dBu, 0 dBr = +24 dBu
ColorSweep Trace Line Style Thick Data Axis Comment Cursor1 Cursor2
1 1 Red Solid 4 Fft.Ch.2 Ampl Left *-109.271 dBr A *-118.787 dBr A
-150
-100
-148
-146
-144
-142
-140
-138
-136
-134
-132
-130
-128
-126
-124
-122
-120
-118
-116
-114
-112
-110
-108
-106
-104
-102
-109.271
-118.787
d
B
r
A
2k 32k4k 6k 8k 10k 12k 14k 16k 18k 20k 22k 24k 26k 28k 30k
20.022k 30.0293k
Hz
dx=10.0073 kHz
dy=-9.515 dB
The above FFT plot shows that the PRE420 has very little harmonic distortion at high frequencies.
The 10 kHz test tone is notched out with a THD analyzer to improve the resolution of the test. The
20-kHz 2
nd
-harmonic distortion measures better than -109 dB. The 30-kHz 3
rd
-harmonic distortion
measures better than -118 dB.
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