Electro-Voice P 1202 - Signal Level and Performance; Voltage Amplification and Input Level; Amplitude Non-Linearity; Frequency Response and Noise Interference

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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 = 0Ω
UNGROUNDED : R = 5Ω
8. Amplitude – Non-Linearity
- measured with a 8Ω 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) = 50Ω
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) = 50Ω