# US 5,703,324 A · Shielded banana plug with double shroud and input receptacle

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- Number: US 5,703,324 A
- Document ID: US5703324A
- Status: Granted
- Kind: A
- Application number: 08/640,387
- Filed: 1996-04-30
- Granted: 1997-12-30
- Earliest claimed: 1996-04-30
- Assignees: Fluke Corporation
- Inventors: Piet Harder
- Web page: https://patentgrep.com/patent/US5703324A

## CPC

- H01R 24/38: having concentrically or coaxially arranged contacts
- H01R 24/28: Coupling parts carrying pins, blades or analogous contacts and secured only to wire or cable
- H01R 11/18: End pieces terminating in a probe
- H01R 2103/00: Two poles
- H01R 2201/20: for testing or measuring purposes
- H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS

## Abstract

A shielded banana plug attached to one end of a test lead is suitable for connection to a corresponding input receptacle in an instrument. The plug includes an inner conductor having an first nonconductive shroud which is concentric with and spaced apart from the inner conducter. The shroud extends beyond the tip of the inner conductor. A conductive shield is concentric with and outside the first nonconductive shroud and is recessed from the end of the shroud. A nonconductive outer shroud is spaced apart from and concentric with the shield and extends beyond the tip of the inner conductor. An input receptacle suitable for mating with the shielded banana plug includes an conductive inner sleeve for receiving the inner conductor, a nonconductive shroud that is concentric with and outside the inner sleeve and which extends beyond the inner sleeve, and a conductive outer sleeve for receiving the conductive shield. The input receptacle is also suitable for mating with a conventional, nonshielded banana plug.

## Claims

### Claim 1

A connection system for an instrument and test leads comprising:
(a) a shielded banana plug having:
(i) an inner conductor,
(ii) a first shroud spaced apart from said inner conductor,
(iii) a conductive shield surrounding said first shroud, and
(iv) a second shroud spaced apart from said shield; and,
(b) an input receptacle having:
i) an inner sleeve having an open end for receiving said inner conductor,
(ii) a nonconductive shroud substantially surrounding said inner sleeve, and
(iii) a conductive shroud spaced apart from and substantially surrounding said nonconductive shroud for engaging said conductive shield when said plug is inserted into said receptacle.

### Claim 2 (depends on 1)

A connection system according to claim 1, wherein said first shroud of said shielded banana plug extends beyond an end of said inner conductor.

### Claim 3 (depends on 2)

A connection system according to claim 2, wherein said conductive shield of said shielded banana plug terminates short of an end of said first shroud.

### Claim 4 (depends on 3)

A connection system according to claim 3, wherein said second shroud of said shielded banana plug extends beyond an end of said conductive shield.

### Claim 5 (depends on 4)

A connection system according to claim 4, wherein said nonconductive shroud of said input receptacle extends beyond said open end of said inner sleeve.

### Claim 6 (depends on 1)

A connection system according to claim 1, wherein said inner conductor, first shroud, conductive shield, and second shroud are substantially coaxial.

### Claim 7 (depends on 6)

A connection system according to claim 6, wherein said inner sleeve, nonconductive shroud, and conductive shroud are substantially coaxial.