7
10.
Amplitude - Non-Linearity
•
testing with load resistor 8 ohms, dual mode
•
MDW = 80 kHz
•
input sensitivity = 0 dBu
•
power amplifier's condition as shipped from the factory
Measurement
at nominal voltage
U(A) = 63.2 V
at nominal voltage
U(A) = 20 V
Remarks
THD+N ( f = 1 kHz )
< 0.005 %
< 0.005 %
THD+N ( f = 10 kHz)
< 0.02 %
< 0.01 %
IMD-SMPTE
< 0.01 %
< 0.01 %
60 Hz, 7 kHz
DIM 30
< 0.007 %
< 0.005 %
3.15 kHz, 15 kHz
DIM 100
< 0.009 %
< 0.005 %
3.15 kHz, 15 kHz
11.
Frequency Response
vs
21 JUN 94 10:06:59
-21.00
-18.00
-15.00
-12.00
-9.000
-6.000
-3.000
0.0
3.0000
AMPL(dBr)
10
100
1k
10k
100k
FREQ(Hz)
1
2
1
2
Plot 1: HI/LO-Cut on Plot 2: HI/LO-Cut off
12. Noise Interference
- U(F) = external voltage un-weighted with B = 22 Hz … 22 kHz, effective value (IEC 268-1)
- U(G) = noise voltage, frequency-weighting filter according to CCIR-468-3, quasi peak weighted (IEC 268-
1)
- U(A) = interference voltage A-weighted, dB(A), effective value (IEC 268-1)
- Signal-to-noise ratio referenced to a nominal output voltage of 55.6 V (800W/4 ohms)
-
HI/LO-CUT ON, GND LIFT = GROUNDED, input sensitivity = 0 dBu
Interference
output voltage
S/N ratio
Equivalent input
interference
voltage
Equivalent input
interference level
Residual
interference
output voltage
U(F)
< 550µV
> 100 dB
< 7.5µV
< -100 dBu
< 350µV
U(G)
< 1.84mV
> 89.7 dB
< 25µV
< -89.7 dBu
< 1.23mV
U(A)
< 440µV
> 102 dB
< 6µV
< -102 dBu
< 320µV
13. Crosstalk
- at f = 1 kHz
< -70 dB
