Q&A Impulse Noise Simulators (Model: INS series)

 

Coupling adapters

 

Q1.

What electromagnetic phenomena does the Coupling Adapters intend to simulate?

 

Q2.

What is the operating principle of the Coupling Adaptors CA-803A/CA-805B/CA-806 (15-00007A)?

 

Q3.

How shall we use each type of Coupling Adaptor distinctively?

 

Q4.

Q2. tells that both of the CA-803A and CA-806 (15-00007A) are inductive couplers. Then what are the differences between them?

 

Q5.

What is the coupling ratio specification of the CA-805B ?

 

Q6.

Which port is the correct port for connection of CA-803A/CA-806 (15-00007A) to the INS series simulators, PULSE OUT or 50 OHM TERM OUT?

 

Q7. How (to which port) shall the CA-805B be connected to the INS series simulators?

  

Q1.

What electromagnetic phenomena does the Coupling Adapters intend to simulate?

 

 

The INS method is considered a conducted immunity test method since simulated interference sources are load current interruptions.  But, associated cables with the load including cables of the AC networks often become an unintended (accidental) transmitting antenna.  Similarly, for victim equipment, other leads than AC or DC power supply act unintentional (unwanted) receiving antenna.  Coupling adapters are used to simulate such interference events. Also refer to Q&A.1 of "What ever is the INS series simulator?" section.

   
Q2.

What is the operating principle of the Coupling Adaptors CA-803A/CA-805B/CA-806 (15-00007A)?

 

 

Coupling method is largely divided into two categories: capacitive coupling & inductive coupling. 

 

The term "capacitive" means the coupling through a capacitor.  The metal plate of the adaptor and the wires under test forms a certain capacitance by being put into proximity with an insertion of a dielectric material, and actually functions like a coupling capacitor. 

 

The term "inductive" means electrically the same coupling mode as a transformer.  The circuit in the coupling adaptor works as the primary winding and the cables under test which are surrounded by the adaptor works as the secondary.  The CA-805B is a capacitive coupler and the CA-803A and CA-806 (15-00007A) are inductive couplers.

   
Q3.

 How shall we use each type of Coupling Adaptor distinctively?

 

  Different coupling methods generate different test results (immunity level) depending on different circuit properties of the circuit under test.  Generally speaking, the most appropriate answer is "The both tests are recommended".   Also refer to Q&A. 2.
   
Q4.

Q&A 2 tells that both of the CA-803A and CA-806 (15-00007A) are inductive couplers.  Then what are the differences between them?

 

  The CA-803A and CA-806 (15-00007A) have different coupling ratio of 20:1 and 10:1, respectively. Coupling ratio is the ratio of input voltage (from the INS pulse out) to output voltage (from the adapter).  
     
 Q5.

What is the coupling ratio specification of the CA-805B ?

 

 

  Unlike an inductive coupler, the CA-805B has no defined number for this parameter as a capacitive coupler. Values being measured vary depending on the resistances and positions of the lines under test.  Refer to  the Figure.  
     
Q6.

Which port is the correct port for connection of CA-803A/806 to the INS series simulators, PULSE OUT or 50 OHM TERM OUT?

 

 
  The CA-803A/806 has a built-in 50 ohm terminator in the coupler itself. Therefore the adaptor shall be connected to PULSE OUT.  
     
Q7.

How (to which port) shall the CA-805B be connected to the INS series simulators?

 

 
  One connector of the CA-805B shall be connected to the PULSE OUT port and the opposite side to the TERM IN port.  The CA-805B has a similar construction to a coaxial cable.  Therefore, the CA-805B like 50 ohm coaxial line shall be terminated by a 50 ohm resistor, which can be done by the built-in terminator through TERM IN port.  
     

 

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