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Performance Level 

 
The test results shall be classified in terms of the loss of function or degradation of performance of the 
equipment under test, relative to a performance level by its manufacturer or the requestor of the test, or the 
agreed between the manufacturer and the purchaser of the product. 
 
Definition related to the performance level: 
1. Based on the used product standard 
2. Based on the declaration of the manufacturer, requestor or purchaser 

 

For EN55024 
Criterion A: 
Definition: normal performance within limits specified by the manufacturer, requestor and purchaser. 
The equipment shall continue to operate as intended without operator intervention. No degradation of 
performance or loss of function is allowed below a performance level specified by the manufacturer when 
the equipment is used as intended. The performance level may be replaced by a permissible loss of 
performance. If the minimum performance level or the permissible performance loss is not specified by the 
manufacturer, then either of these may be derived from the product description and documentation, and by 
what the user may reasonably expect from the equipment if used as intended. 
 
Criterion B: 
Definition: temporary loss of function or degradation of performance which ceases after the disturbance 
ceases, and from which the equipment under test recovers its normal performance, without operator 
intervention. 
After the test, the equipment shall continue to operate as intended without operator intervention. No 
degradation of performance or loss of function is allowed, after the application of the phenomena below a 
performance level specified by the manufacturer, when the equipment is used as intended. The performance 
level may be replaced by a permissible loss of performance. During the test, degradation of performance is 
allowed. However, no change of operating state or stored data is allowed to persist after the test. If the 
minimum performance level (or the permissible performance loss) is not specified by the manufacturer, then 
either of these may be derived from the product description and documentation, and by what the user may 
reasonably expect form the equipment if used as intended. 
 
Criterion C: 
Definition: temporary loss of function or degradation of performance, the correction of which requires 
operator intervention. 
Loss of function is allowed, provided the function is self-recoverable, or can be restored by the operation of 
the controls by the user in accordance with the manufacturer’s instructions. Functions, and/or information 
stored in non-volatile memory, or protected by a battery backup, shall not be lost. 
 
Criterion D: 
Definition: loss of function or degradation of performance, which is not recoverable, owing to damage to 
hardware or software, or loss of data. 

 

 

8.1. Test  Equipments 

Item  Equipment 

Manufacturer Model No. Serial No. 

Last Cal. 

Cal. Interval

1.    ESD Tester  EM Test 

Dito 

V0503100053 Mar.06, 07  1 Year 

8.2. Block Diagram of Test Setup 

8.2.1.Block Diagram of EUT Test Setup                                              

 
 
 
 
 
 
 
 
 
 
 
 
 

 

8.2.2.Block Diagram of ESD Test Setup 

 

 
 
 
 
 
 
 
 
 

8.3. Test  Standard 

EN 55024: 1998+A1:2001+A2: 2003 (IEC 61000-4-2: 2001) 
(Severity Level 3 for Air Discharge at 8kV,   
Severity Level 2 for Contact Discharge at 4kV) 

Remark:      is Discharge Electrode 

EUT and 

Support System

AC Mains 

AC Mains 

ESD 

Tester 

0.8 m 

PC  

AC Mains

Keyboard  

Mouse 

EUT 

AC Mains

Monitor

a: Audio Cable 
b: USB Cable 
 : Core 

a

Adaptor

b

 

8.4. Severity Levels and Performance Criterion 

8.4.1. Severity level 

Level Test 

Voltage 

Contact Discharge (kV)

Test Voltage 

Air Discharge (kV) 

1.  

2 

2 

2.  

4 

4 

3.  

6 

8 

4.  

8 

15 

X Special 

Special 

8.4.2. Performance criterion : B 

8.5. EUT  Configuration 

The configuration of EUT are listed in Section 3.5. 

8.6. Operating Condition of EUT 

Same as radiated test which is listed in Section 4.6. except the test set up replaced by 
Section 8.2. 

8.7. Test  Procedure 

8.7.1. Air 

Discharge: 

The test was applied on non-conductive surfaces of EUT. The round discharge tip 

of the discharge electrode was approached as fast as possible to touch the EUT. 
After each discharge, the discharge electrode was removed from the EUT. The 
generator was    re-triggered for a new single discharge and repeated 20 times for 
each pre-selected test point. This procedure was repeated until all the air discharge 
completed 

8.7.2. Contact Discharge: 

All the procedure was same as Section 8.7.1. except that the generator was 

re-triggered for a new single discharge and repeated 50 times for each pre-selected 
test point. the tip of the discharge electrode was touch the EUT before the 
discharge switch was operated. 

8.8. Test  Results 

PASS. 
 
The EUT was tested and all the test results are listed in next page. 

 

Applicant 

: 

Harman Multimedia DBA Harman 
Motive Inc. 

Test Date 

: 

EUT 

: 

Computer Speaker System 

:  25

℃

M/N 

: 

jbl on stage lll 

Humidity 

:  55

％

Test Voltage 

: 

Test Mode 

: 

Test Engineer 

Shelle Criterion 

100.6KPa 

±

±

±

±

±