DEMO — fictional range. Local brief only, NOT SENT. No personal data is collected or transmitted.
PRODUCT / FICTIONAL EXAMPLE
Shielded backshell
A two-part shell that closes over a cable entry and bonds the shield. The bond is the specification, because a shield that is not bonded is an antenna.
How it is made.
The halves are die-cast and machined where they meet, and the strain relief is moulded onto the cable. The bond between the shell and the cable shield is what makes the screening work, and it is measured rather than assumed.
Illustrative specification
- Shell
- Example · 340 × 240 mm envelope
- Halves
- Example · die-cast, machined joint
- Strain relief
- Example · moulded, 140 mm
- Bond
- Example · 360 degree clamp
- Screws
- Example · M3, 4 places
- Finish
- Example · nickel over copper
Every value above is an illustrative example for a fictional range. It is not a quotation, a capability statement or a measurement of any real product.
Why the bond is the specification.
Because a shield that is not connected to anything screens nothing. The shell is a conductor, and the clamp is what joins it to the cable screen; a shell closed over an unbonded screen is a metal box with an aerial inside it.
Why the joint is machined.
Because the two halves form the shield. An unmachined joint leaves a gap, and a gap in a shield is a slot that radiates at the frequency whose wavelength matches it.