22
should be 1.5V (±0.2V) measured. If not adjust preset on the power amp PCB to get 1.3V (±0.2V)
8. AMP PERFORMANCE MEASUREMENT:
1) SENSITIVITY
- Drive single channel into 4 ohms load in Stereo mode at 1 kHz.
- Increase the input to get 82V (1680 W) just clipped output.
- The input required to get 82V output is the rated sensitivity.
- The Specification for the Sensitivity is 1.2V (±0.3V)
Input connectors check:
XLR balanced: Use XLR balance male connector (pin 2 “+”, pin 3 “-“& pin 1-gnd) from generator to
XLR socket and check sensitivity as above.
Stereo jack – Use stereo jack connector (Tip “+”, Ring “-“and Shield –GND) from generator to JACK
socket and check sensitivity as above.
2) FREQUENCY RESPONSE MEASUREMENT:
- Drive single channel into 4 ohms load in Stereo mode at 1 kHz.
- Apply input of the rated sensitivity and adjust the output to 30V using gain control pot.
- Change the frequency of the applied input and note the output reading.
FREQUENCY
20Hz 1KHz 20K
OUTPUT/ CH 28-32V 30V 28-32V
3) POWER V/S THD
II. Stereo Mode Single Channel Driven.
- Single channels driven in various load conditions.
- Gain pot MAX.
- Feed 1KHz signal & adjust output at just clipping level.
Power Output in V
Ch 1 Ch 2
Load
82.5V 82.5V
4 Ω
87V 87V
8 Ω
II. Stereo Mode Dual Channel Driven
- Both channels driven in various conditions
- Gain pot MAX.
- Feed 1KHz signal & adjust output at just clipping level.
Power Output in V
Ch 1 Ch 2
Load
75V 75V
4 Ω
85V 85V
8 Ω
III. Parallel Mode:
- Feed Input to Channel 1 only.
- Both channels connected to appropriate loads.
- Mono mode selected from the Back Plate mode selection switch.
- Check that you get the similar power as per Stereo mode.
- Make sure that the Channel 2 input is not connected.
IV. Bridge Mode:
- Input to Channel 1 only.
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