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IRAUDAMP5 REV 3.1
Test Procedures
1.
Connect 4
Ω
, 250W load to outputs connectors, J3 and J4 and Audio Precision analyzer
(AP).
2.
Connect Audio Signal Generator to J6 and J5 for CH1 and CH2 respectively (AP).
3.
Connect a dual power supply to J7, pre-adjusted to ±35V, as shown in Figure 2 above.
4.
Set switch S3 to middle position (self oscillating).
5.
Set volume level knob R108 fully counter-clockwise (minimum volume).
6.
Turn on the power supply. Note: always apply or remove the ±35V at the same time.
7.
Orange LED (Protection) should turn on almost immediately and turn off after about 3s.
8.
Green LED (Normal) then turns on after orange LED is extinguished and should stay on.
9.
One second after the green LED turns on; the two blue LEDS on the Daughter Board
should turn on and stay on for each channel, indicating that a PWM signal is present at
LO
10.
With an Oscilloscope, monitor switching waveform at test points TP1 and TP2 of CH1
and CH2 on Daughter Board.
11.
If necessary, adjust the self-oscillating switching frequency of AUDAMP5 to 400KHz
±
5kHz using potentiometer R29P. For IRAUDAMP5, the self-oscillating switching
frequency is pre-calibrated to 400 KHz. To modify the AUDAMP5 frequency, change the
values of potentiometers R21 and R22 for CH1 and CH2 respectively.
12.
Quiescent current for the positive supply should be 70mA
±
10mA at +35V.
13.
Quiescent current for the negative supply should be 100mA
±
10mA at –35V.
14.
Push S1 switch, (Trip and Reset push-button) to restart the sequence of LEDs indicators,
which should be the same as noted above in steps 6-9.
Audio Tests:
15.
Apply 1 V RMS at 1KHz from the Audio Signal Generator
16.
Turn control volume up (R108 clock-wise) to obtain an output reading of 100Watts for
all subsequent tests as shown on the Audio Precision graphs below, where measurements
are across J3 and J2 with an AES-17 Filter
Typical Performance
The tests below were performed under the following conditions:
±B supply = ±35V, load impedance = 4
Ω
resistive load, 1kHz audio signal,
Self oscillator @ 400kHz and internal volume-control set to give required output with 1Vrms
input signal, with AES-17 Filter, unless otherwise noted.
Summary of Contents for IRAUDAMP5
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