Alto ELVIS12A Посібник з експлуатації - Сторінка 6

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MAIN SETUP

Connect the VARIAC set at 0VAC from the Mains AC voltage and the power amplifier under test and use a power cord with ground connected.

Turn full anticlockwise the knob of Main Volume.

Set the EQ filter, Low-Mid-High in central position.

Connect the Function Generator to the Line Input(Combo) and set at 1kHz/0.775V.

Connect the Oscilloscope with CH1 probe linked to the Input of the Function Generator and the CH2 probe to the Output of the power amplifier.

Connect a 4 ohm/400W fan load Resistors with an ON/OFF switch and start in OFF position.

DC OFFSET

Switch On the Power Amplifier under test, increase with the VARIAC the AC Voltage slowly and verify in the CH2 the offset stability, reduce

the sensitivity from 20V/div at 5V/div and confirm a maximum offset at +/-0.5VDC.

Switch ON the 4 ohm resistive Load and verify same conditions.

FREQUENCY RESPONSE

Open slowly the Main Volume and verify a perfect 1kHz sinusoidal wave, increase the level until to see a symmetrical square wave.

EQ FILTER

Set the Function Generator at 10dB (0.245V) and test the EQ control.

LOW-EQ control at 100Hz with a range of +/-6dB, Max./Min. of the knob.

MID-EQ control at 2kHz with a range of +/-6dB, Max./Min. of the knob.

HIGN-EQ control at 10kHz with a range of +/-6dB, Max./Min. of the knob.

MIC GAIN

Set the Function Generator at 10dB(0.245V), connect to MIC input and control the frequency response.

SIG/COMP

Set the knob of the Main Volume at 1/4, set the CH2 at 5V/div, increase the level at 1kHz and check the SIG/COMP LED colour, when the

output is 5V the colour is green. Set the CH2 at 20V/div and increase the level, it must be change from green to red colour, if you increase the

input , the output level must keep at same level.

GROUND LIFT

Check the ground-lift with a digital multi-meter, the switch remove the electrical ground Of the input connector (Combo and XLR) form the earth

ground of the chassis.