Questions: Screened cables

 

 

 

 

 

 

 

Question no. 1

A screened multi-way cable has a pigtail termination, with a pigtail length of cm. With an induced screen current of mA at MHz and assuming an approximate inductance of 10nH per cm, what voltage will be coupled onto the inner conductors with respect to the screen termination?
Possible answers Choose



Answer A is:

Answer B is:

Answer C is:

Answer D is:

Review: Pigtails

Question no. 2

The graphs in the figure (extracted from DEF STAN 59-411 Part 5) refer to the induced voltage on a 0.6 m cable from a 1 V/m E-field for varying lengths of pigtail, including no screen (at the top) and a good screened connector (at the bottom). They all show a peak around 100MHz. This is related to:
Possible answers Choose

Answer A is:

Answer B is:

Answer C is:

Answer D is:

Review: HF cable shielding, transmission line behaviour

Question no. 3

Which cable gives the best low frequency EMC performance for a balanced instrumentation transducer circuit?
Possible answers Choose

Answer A is:

Answer B is:

Answer C is:

Answer D is:

Review: LF cable shielding, twisted pair

Question no. 4

The RF shielding performance of a single-braided shielded cable gets worse with increasing frequency. This is because:

Possible answers Choose

Answer A is:

Answer B is:

Answer C is:

Answer D is:

Review: Transfer impedance

Question no. 5

The RF shielding performance of a solid metal conduit gets better with increasing frequency. This is because:
Possible answers Choose

Answer A is:

Answer B is:

Answer C is:

Answer D is:

Review: Transfer impedance