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IRAUDAMP10 REV
1.1
Test Procedures
Test Setup:
1. Connect 4
-200 W dummy loads to 2 output connectors (P2 and P3 as shown on Fig 1)
and an Audio Precision analyzer (AP).
2. Connect the Audio Signal Generator to CN1 for CH1~CH2 respectively (AP).
3. Set up the dual power supply with voltages of ±50V; current limit to 5A.
4. TURN OFF the dual power supply before connecting to On of the unit under test (UUT).
5. Connect the dual power supply to P1. as shown on Fig 1
Power up:
6. Turn ON the dual power supply. The ±B supplies must be applied and removed at the
same time.
7. One orange and two blue LED should turn ON immediately and stay ON
8. Quiescent current for the positive supply should be 45mA
10mA at +50V.
9. Quiescent current for the negative supply should be 95mA
10mA at –50V.
Switching Frequency test
10. With an Oscilloscope, monitor the switching waveform at test points VS1~VS2. Adjust
VR1A and VR1B to set the self oscillating frequency to 500 kHz
25 kHz when DUT in
free oscillating mode.
Functionality Audio Tests:
11. Set the signal generator to 1kHz, 20 mV
RMS
output.
12. Connect the audio signal generator to CN1(Input of CH1,CH2,CH3)
13. Sweep the audio signal voltage from 15 mV
RMS
to 1 V
RMS
.
14. Monitor the output signals at P2/P3 with an oscilloscope. The waveform must be a non
distorted sinusoidal signal.
15. Observe that a 1 V
RMS
input generates an output voltage of 34.88 V
RMS
(CH1/CH2). The
ratio, R4x/(R3x) and R30x/(R31x), determines the voltage gain of IRAUDAMP10.
Test Setup using Audio Precision (Ap):
16. Use an unbalanced-floating signal from the generator outputs.
17. Use balanced inputs taken across output terminals, P2 and P3.
18. Connect Ap frame ground to GND at terminal P1.
19. Select the AES-17 filter(pull-down menu) for all the testing except frequency response.
20. Use a signal voltage sweep range from 15 mV
RMS
to 1.5 V
RMS
.
21. Run Ap test programs for all subsequent tests as shown in Fig 2- Fig 7below.
