Q&A Lightning Surge Simulators (Model: LSS series)

 

LSS-700 Series Surge Simulators

 

Q1.

What are the differences between the IEC61000-4-5 and JEC-210/222 standards? What are the differences between each compliant product LSS-F02/15AX series and LSS-700 series?

 

Q2.

We are experiencing a non-compatible test result with our customer. The both are using NoiseKen surge simulators. What is the reason?

 

Q3. What is the purpose of the 100 ohm current limiting resistor built into the LSS-700 series simulators? 
 

 

  

Q1.

What are the differences between the IEC61000-4-5 and JEC-210/222 standards? What are the differences between each compliant product LSS-F02/15AX series and LSS-700 series?

 

 

The followings are some important points to be highlighted comparing the both products.


Unlike the 1.2/50 uS combination waveform generator defined in the IEC standard, the 1.2/50 uS and 8/20 uS waveforms are generated by two distinct circuits in the LSS-700 series simulators.  The output impedance value for the IEC 61000-4-5 1.2/50 uS generator is 2 ohm.  The JEC standards are basically for high voltage impulse withstand testing thus do not have any value specified for its source impedance value. 

 

However, NoiseKen specifies 6 ohm impedance for their LSS-700 series products.  The LSS-F02/15AX series simulators generate 7.5kA short-circuit current (15kV ÷2 ohm=7.5kA) against 15kV test voltage setting. In that instant, 8/20uS waveform is obtained. 

 

The LSS-700 series simulators, when set to 30kV,  generate 5kA short-circuit current (30kV/6 ohm).  For 8/20 uS short circuit current generator circuitry in the LSS-700 series, the source impedance of 5 ohm is adopted, where setting at 6kA generates 30kV open circuit voltage (6kA x 5 ohm =30kV) for open circuit condition. 

 

The JEC standards do not defined powered testing for the EUT. By the nature of the standard specifying impulse withstand voltage capability, powered testing is not considered.  The NoiseKen LSS-700 series simulators have capability to test the EUT operating on AC, though.

   
Q2.

We are experiencing a non-compatible test result with our customer. The both are using NoiseKen surge simulators. What is the reason?

 

 

Check the model numbers of the surge simulators which each company uses.  The LSS-F02/15AX and LSS-700 series are based on completely different test circuit thus generating different test results. Also refer to Q&A 1.

   
Q3.

What is the purpose of the 100 ohm current limiting resistor built into the LSS-700 series simulators?

 

  The LSS-700 series surge simulators are intended also for classical surge withstand voltage testing. For this purpose, a 100 ohm resistor is provided to greatly lower the peak current amplitude, as in terms of testing purpose, high peak current is no longer required.
   

 

 

   

 

 

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