6
(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
U(E)
Measuring point
U(A)
Load resistor
Jumper on
86207/86211
CH. A/B
0 dBu
SPEAKER A/B
69.3 V
4 Ohm
select J11,J21
CH. A/B
+ 6 dBu
SPEAKER A/B
69.3 V
4 Ohm
select J12,J22
CH. A/B
+ 13 dBu
SPEAKER A/B
69.3 V
4 Ohm
select J13,J23
CH. A/B
+1 dBu
SPEAKER A/B
77.5 V
8 Ohm
select J11,J21
CH. A/B
-2 dBu
SPEAKER A/B
54.8 V
2 Ohm
select J11,J21
6.2. MAXIMUM INPUT LEVEL:
U(E) = +21 dBu (9 Vrms)
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)
Measuring point
U(A)
Load resistor
Remarks
CH. A
0 dBu
BRIDGED OUT
109.5 V
4 ohms
select J11,J21
CH. A
0 dBu
BRIDGED OUT
138.5 V
8 ohms
select J11,J21
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
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
Содержание Precision P3000
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