ERROR 38191: A direct connection across a cable shield(s) in a cable cross section is not supported

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

I'm trying to measure the irradiation that an antenna has on the cable, that's why it doesn't have a source. The cable has two conductors, with a copper shield an dielectric filled. I'm seeing the following error, but I can find any way to fix it in documentation or other forums.

 

ERROR 38191: A direct connection across a cable shield(s) in a cable cross section is not supported

image.png.b345bdf28dc679531a15d96dbc0a1aeb.png

Tagged:

Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2018

    Hi @cpech

     

    Could you please attach your .cfx file?

     

    Thanks.

  • JIF
    JIF
    Altair Employee
    edited May 2018

    Hello cpech,

     

    The problem is that you are connecting to the ground directly from a pin, while the shield is in the air. Have a look at Pin2 for the Front connector, it connect via a capacitor to ground, but in both cases the shield is not connected in any way to ground. We have not been able to prove that the formulation works for these kinds of configurations and thus we have added an error to prevent users from incorrect results. Usually the shield will be connected to your structure in some way (very low resistance or a capacitance). If you add such a connection from the shield to the ground, you can measure the voltage of the pin relative to the shield and the error would be resolved.

     

    Note that I'm not an EMC / cable expert, so maybe some others on the forum can also advise.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2019

    Hi Everyone, 

     

     

    I have the same error, however I connected with low impedance on the shield pin and it did not work, could someone suggest me another way to solve?

     

    Follow my coaxial_cable and error:

    ERROR 38191: A direct connection across a cable shield(s) in a cable cross section is not supported

    image.png.3f63ac1947850312bc66f90dd9813e9f.png

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2019

    Hi @Marlodias

     

    Please try connect the outer pin of the voltage source directly to the shield, you can leave the 100mOhm resistor to ground, i.e. the cable is fed between shield and Pin1 and there is a common connection down to the system ground.

    Similarly for CableConnector2 connect R2 directly to the shield, leave the 100 mOhm resistor to ground. 

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2019

    Hi Peter Futter,

     

    Thanks for your advice, it works and solved my model. 

Categories