Read Harman Kardon AVR 235 EMC - CB Certificate online
- Page 4 of 7 -
Order No. 34137
HEATING
∆
t = ( R2 - R1) x (234,5 + t1) - (t2 - t1)
R1
P
t1 =
24,5 °C
24,5 °C
t2 =
24,9 °C
23,5 °C
Test voltage
207 V
254,4 V
Winding
R1/
Ω
R2/
Ω
∆
t measured
∆
t allowed *)
Insulation
class
class
Main transf. pr. winding (207V)
1,807
2,288
68,5
85
Class E
Sub transf. pr. winding (207V)
2747
3235
45,6
85
Class E
Main transf. pr. winding (254,4V)
1,807
2,305
72,4
85
Class E
Sub transf. pr. winding (254,4V)
2747
3347
57,6
85
Class E
Other measured parts
∆
t measured
at 207V
∆
t measured
at 254,4V
∆
t allowed *)
Main transformer core
53,6
57,5
85
Sub transformer core
37,4
45,0
85
Diode, D991 body
61,5
63,9
-
PWB near D991
61,9
63,0
85
TR, Q803 body
50,5
59,5
-
TR, Q804 body
32,5
38,9
-
PWB near Q804
48,1
56,0
85
E. Capacitor, C909 body
33,4
36,8
-
E. Capacitor, C916 body
25,9
29,0
-
Resistor, R810 body
44,2
50,3
-
Main
heat-sink
49,2 59,3 -
Fan body (on heat-sink)
31,8
38,3
60
Power cord bushing
26,6
28,6
60
Top enclosure above main transformer
30,3
35,0
65 **)
Top enclosure above main heat-sink
27,8
33,5
65 **)
Comments
No other parts were observed to create any hazard due to temperature rise.
P
*) Temperature rise limits for Singapore is 10K less.
**) Directly covering part for heat-sink and transformer. The top cover is supplied with
ventilation openings covering most of the top cover. This indicate emission of heat from
internal parts and the opening area is therefore not likely to be touched during normal
use. Based on this the temp. rise is accepted also for Singapore.
ventilation openings covering most of the top cover. This indicate emission of heat from
internal parts and the opening area is therefore not likely to be touched during normal
use. Based on this the temp. rise is accepted also for Singapore.
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