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LANGER 

EMV-Technik 

 
 
 
 

 

DE-01728 Bannewitz 
[email protected] 
www.langer-emv.com 

NNB 21 set 

6  Application 

The measurement set-up should be configured as follows: 
 
-  Place the DUT and line-impedance stabilization network on a ground plane, 

-  Insert the NNB 21 into the supply line between the DUT and power source, 

-  Use cables that are as short as possible and lay them as straight as possible between 

the DUT and the NNB 21 

 for frequencies up to 100 MHz less than 30 cm, 

 for measurements with an upper limit frequency of 1 GHz less than 5 cm, 

-  If both connections of the NNB 21 are used to supply the DUT and the GND switch is 

open, the NNB 21 measures the total current (common mode) of both lines. 

-  For a separate measurement of the HF current in the positive line (   \ Kl 30), the nega-

tive DUT connection must be connected to ground via the ground switch (switch 
closed). For this operating mode, the NNB 21 must be placed directly on the ground 
plate and the DUT ground must be connected to the ground plate. 

Alternatively, the DUT can also be supplied via a single line of the NNB 21. The second 
line must be laid separately. 

To measure the negative line

 (   \ Kl 31)

, switch off the GND switch. 

 

 

 

 

Figure 2

: Measurement setup 

 

Summary of Contents for NNB 21

Page 1: ..._NNB 21 set_user manual User Manual NNB 21 set Line impedance Stabilization Network Measurement of conducted disturbance emissions Copyright C Dipl Ing Gunter Langer N thnitzer Hang 31 01728 Bannewitz...

Page 2: ...Reading and Understanding the Manual 4 2 3 Local Safety and Accident Prevention Regulations 4 2 4 Images 4 2 5 Limitations of Liability 4 2 6 Errors and Omissions 4 2 7 Copyright 4 3 Scope of Deliver...

Page 3: ...nce Stabilization Network agrees with the regulations of EC guidelines Low Voltage Directive 2014 35 EU EMC Directive 2014 30 EU Restriction of certain Hazardous Substances 2011 65 EU Applied standard...

Page 4: ...lity The Langer EMV Technik GmbH is not liable for personal injury or damage to material if the instructions in this user manual were not followed the product was used by personnel who are not qualifi...

Page 5: ...3 Terminal block 2 polie AK 2 pole 4 04 User manual NNB 21 m 1 05 System Case NNB 21 case 1 Important The scope of delivery may differ depending on the respective order Figure 1 NNB 21 set case 4 Tech...

Page 6: ...H carry out a visual inspection Damaged connecting cables must be replaced before operation The product of Langer EMV Technik GmbH may only be used for applications for which it is intended Any other...

Page 7: ...it frequency of 1 GHz less than 5 cm If both connections of the NNB 21 are used to supply the DUT and the GND switch is open the NNB 21 measures the total current common mode of both lines For a separ...

Page 8: ...processed either in its entirety or in part without the prior written permission of Langer EMV Technik GmbH The management of Langer EMV Technik GmbH assumes no liability for damage that may arise fro...

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