SoundSticks II - Harman Kardon Audio EMC - CB Certificate (repair manual). Page 18

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ST-05368 
 
IEC 60950-1 / EN 60950-1 
Clause 
Requirement – Test  
Result – Remark  
Verdict 
 
TRF No.: IECEN60950_1A 
 
 
 
2.5 
Limited power sources 
 
 
Inherently limited output 
 
 
Impedance limited output 
 
N/A 
 
Overcurrent protective device limited output 
 
N/A 
 
Regulating network limited output under normal 
operating and single fault condition 
 P 
 
Regulating network limited output under normal 
operating conditions and overcurrent protective 
device limited output under single fault condition 
 N/A 
 
Output voltage (V), output current (A), apparent 
power (VA) .........................................................: 
See the Note below 
 
 
Current rating of overcurrent protective device (A)  
 
Note: 
The output of the power supply complies with the requirement of inherently Limited Power Source. 
Model: NU40-2240050-I3 
Limits: Isc 
≤ 8.0 A, S ≤ 100 VA. 
Measured Uoc = 24.41 Vdc, Isc = 3.3 A, S = 57.19 VA (23.83 Vdc 
× 2.4 A), under the maximum normal 
operation  
Limits: Isc 
≤ 8.0 A, S ≤ 100 VA. 
Measured Uoc = 24.29 Vdc, Isc = 3.2 A, S = 57.24 VA (23.85 Vdc 
× 2.4 A), under the single fault condition of 
U2 (pin1 – pin2) shorted (the worst case)
Model: NU40-2100400-I3 
Limits: Isc 
≤ 8.0 A, S ≤ 51.55 VA (5 x Uoc). 
Measured Uoc = 10.31 Vdc, Isc = 5.24 A, S = 40.17 VA (9.13 Vdc 
× 4.4 A), under the maximum normal 
operation 
Limits: Isc 
≤ 8.0 A, S ≤ 51.45 VA (5 x Uoc). 
Measured Uoc = 10.29 Vdc, Isc = 5.2 A, S = 41.62 VA (9.46 Vdc 
× 4.4 A), under the single fault condition of 
U2 (pin1 – pin2) shorted (the worst case). 
Model: NU40-2050400-I3 
Limits: Isc 
≤ 8.0 A, S ≤ 26.0 VA (5 x Uoc). 
Measured Uoc = 5.2 Vdc, Isc = 6.9 A, S = 21.53 VA (4.58 Vdc 
× 4.7 A), under the maximum normal 
operation  
 Limits: Isc 
≤ 8.0 A, S ≤ 25.5 VA (5 x Uoc). 
Measured Uoc = 5.1 Vdc, Isc = 6.8 A, S = 21.76 VA (4.63 Vdc 
× 4.7 A), under the single fault condition of U2 
(pin1 – pin2) shorted (the worst case)
 
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