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6. Level
6.1. VOLTAGE AMPLIFICATION
Unit
Input
U(E)
Measuring
point
U(A)
U(A)
Gain
Load
Resistor
Test
frequency
X1201/
P1201
CH. A or B
+5.8dBu
OUTPUT
+39dBu
69.2V
33.2
1kHz
X1201/
P1201
CH. A + B
-0.2dBu
OUTPUT
+39dBu
69.2V
39.2
1kHz
6.2. MAXIMUM INPUT LEVEL: U(E) = +21dBu
7. GROUND LIFT-switch
The circuit ground (at the input or output connector) is measured against the enclosure ground
(contact on the ground-screw on the rear of the appliance or ground contact on the mains plug).
Switch set to
GROUNDED
: R = 0
Ω
UNGROUNDED : R = 5
Ω
8. Amplitude – Non-Linearity
- measured with a 8
Ω
load resistor connected
- MBW = 80kHz
Test
At nominal output power
Remarks
THD+N ( f = 1kHz )
<0.05%
IMD-SMPTE
<0.08%
60Hz, 7kHz
DIM 30
<0.03%
3.15kHz, 15kHz
9. Frequency Response
Linear Frequency Response (mind border frequencies)
Lower border frequency
Upper border frequency
-3dB
fu < 10Hz
fo = 85kHz
-1dB
fu = 13Hz
fo = 45kHz
10. Noise Interference
- U(F) = extraneous voltage non-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)
- S/N ratio ref. to max. output voltage into 4 ohms = 55.1 V (+37 dBu) and interference voltage A-weighted
Power
Amp
Output
U(F)
dBu
U(G)
dBu
U(A)
dBu
GAIN
dB
IN(A)
dBu
S/N-R.
dB
Remarks
Input Channel A & B operated. (as shipped)
X1201 /
P1201
SPEAKER OUT
- 63
- 51
- 65
33
- 98
>
104
INPUT A&B R(Q) = 50
Ω
Only channel A operated. Remove the resistors R291 / R292 off the printed board assembly 84194/2.
X1201 /
P1201
SPEAKER OUT
- 65
- 54
- 67
33
- 100
>
106
INPUT A R(Q) = 50
Ω
