Nominal Level; Maximum Input Level; Input-Routing Switch; Level Bridged Mode - Electro-Voice P3000 Service Manual

(100 ms ON, 900 ms OFF), applied to each channel at a time. The protection circuit has to react. The power
amplifier tries to re-start continuously while the PROTECT LED blinks with the same frequency.
Repeat the test with f = 30 kHz and the limiter set to ON; the power amplifier should not switch off.
6. Level CHANNEL A&B:
• set the level control to its fully clockwise position.
• set the INPUT ROUTING switch to: DUAL / STEREO.
• HI-LOW-CUT switch is ON (as factory pre-set!).
• BRIDGED MODE: NORMAL
• LIMITER: SLOW (as factory pre-set!)
• THD < 0.1 %

6.1. NOMINAL LEVEL

Input
CH. A/B
CH. A/B
CH. A/B
CH. A/B
CH. A/B

6.2. MAXIMUM INPUT LEVEL:

7.

INPUT-ROUTING switch

DUAL / STEREO (as factory pre-set!)
- channel A and B have to be driven separately.
PARALLEL / MONO
- channel A and B are paralleled at the input. Both channels can be driven using a common signal source.
8.

Level BRIDGED MODE

• set the level control all the way to its fully clockwise position.
• HI-LOW-CUT switch is ON (as factory pre-set!).
• BRIDGED MODE: BRIDGED
• LIMITER: SLOW (as factory pre-set!)
• THD < 0.1 %
BRIDGED: Double the output voltage is presented at the BRIDGED OUT connector. It is mandatory to use the
CHANNEL A input connector. The CHANNEL B input connector is without function.
Input U(E)
CH. A 0 dBu
CH. A 0 dBu
9. GROUND LIFT switch
Test the functioning of the switch using an ohm-meter:
The circuit ground (at the input or the output connector) is measured versus the common ground of the enclosure
(contact at the ground terminal, located on the rear panel - or common ground of the mains cord).
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
THD+N ( f = 1 kHz )
THD+N ( f = 10 kHz)
IMD-SMPTE
DIM 30
U(E) Measuring point
0 dBu SPEAKER A/B
+ 6 dBu SPEAKER A/B
+ 13 dBu SPEAKER A/B
+1 dBu SPEAKER A/B
-2 dBu SPEAKER A/B
Measuring point
BRIDGED OUT
BRIDGED OUT
at nominal voltage
U(A) = 63.2 V
< 0.005 %
< 0.02 %
< 0.01 %
< 0.007 %
U(A)
69.3 V
69.3 V
69.3 V
77.5 V
54.8 V
U(E) = +21 dBu (9 Vrms)
U(A) Load resistor
109.5 V
138.5 V
at nominal voltage
U(A) = 20 V
< 0.005 %
< 0.01 %
< 0.01 %
< 0.005 %
6
Load resistor Jumper on
86207/86211
4 Ohm select J11,J21
4 Ohm select J12,J22
4 Ohm select J13,J23
8 Ohm select J11,J21
2 Ohm select J11,J21
Remarks
4 ohms select J11,J21
8 ohms select J11,J21
Remarks
60 Hz, 7 kHz
3.15 kHz, 15 kHz