HD 970 (serv.man7) - Harman Kardon Audio EMC - CB Certificate (repair manual). Page 26

 

 

Page 25 of 55 

Report No. JSH0503351-001 

 

IEC/EN 60065 

Clause 

Requirement – Test 

Result - Remark  

Verdict 

 

TRF No:  IECEN60065F 

TRF originator BEAB 

 

Monitored point: 

Under fault conditions specified below 

DT (K) 

Limit dT (K) 

U9 (pin 2-3) on the mainboard, SC, input 253V~, 
0.35A/45W? 0.114A/20.3Wà0.042A/7.5W, and test time: 20min. 3U1 damaged 
on the button board. No extreme temperature rise, and no hazard.  

Monitored point: button board PCB 

58 

110 

Transformer secondary winding (yellow color), SC, input 253V~, >>0.5A? 0, and 
test time: 5s. F1 opened. No extreme temperature rise, and no hazard.  

Monitored point: -- 

-- 

-- 

           

Winding temperature rise measurements 

           

           

Ambient temperature t1 (

o

C)  .............................. :  —  

—  

           

Ambient temperature t2 (

o

C)  .............................. :  —  

—  

 
Remark: SC is short-circuit, OC is open circuit, OL is overload 
Remark: Insulation resistance and dielectric strength test carried out after each fault condition test, and the 
apparatuses were still found to meet requirements of clause 10.3. 
 
 

13.3& 13.4 

TABLE: clearance and creepage distance measurements 

Pass 

clearance cl and creepage 

distance dcr at/of: 

Up  

(V) 

U r.m.s. 

 (V) 

required cl 

 (mm) 

cl 

 (mm) 

required 

 dcr (mm) 

dcr 

(mm) 

RI: Primary to core 

325 

230 

4.0 

>5.0 

5.0 

>5.0 

RI: Primary to secondary 

325 

230 

4.0 

5.0 

5.0 

5.0 

FI: Between Line and Neutral  

325 

230 

1.5 

3.7 

2.5 

3.7 

FI: Both poles of fuse (F1) 

325 

230 

1.5 

16.4 

2.5 

16.4 

RI: Primary to secondary metal 

parts 

325 

230 

4.0 

7.6 

5.0 

7.6 

Note: 

1) FI: Functional insulation; BI: Basic insulation; SI: Supplementary insulation; RI: Reinforced insulation 

2) CTI material group IIIb is used. 

3) Transformer core connected to accessible secondary parts.