Connectors 101

Connectors 101

# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
There are 41 names in this directory beginning with the letter R.
A type of structure used to house electronic components that permits convenient removal of portions of the equipment.

Rack and Panel Connector
One of two mating fixed connectors intended to provide a connection between a unit and its mounting rack, which is usually provided with an alignment device to ensure correct mating. It normally has no coupling device and is mated by the movement between the unit and the rack (does not apply to the printed boards).

Radio Frequency (RF)
The portion of the frequency spectrum lying between 40KHz and 200GHz.

Radio Frequency Interference (RFI)
Usually electrical interference from intentionally emissive sources; E.g., radar, radio, etc.

The moving portion in the head of a crimping tool.

Random Eye Pattern
The eye pattern measured through the fixture without the test specimen.

Number of sizes of connectors or cables of a particular type.

Range, Wire
The designation of wire/conductor sizes that a given conductor barrel, ferrule, grommet or accessory will accommodate.

Ratchet Control
A device to ensure the full crimping cycle of a crimping tool, preventing a partially crimped contact resulting from an incomplete crimp operation.

Rated Temperature
The maximum temperature at which an electric component can operate for extended periods without loss of its basic properties.

Rated Voltage
The voltage at which an electrical component can operate for extended periods without loss of its basic properties.

(1) The product of the sine of the angular phase difference between the current and voltage times the ratio of the effective (rms) potential difference to the effective (rms) current, there being no source of power in the portion of the circuit under consideration. The reactance is different for each component of an alternating current circuit. Note: The reactance for the entire periodic current is not the sum of the reactances of the components. A definition of reactance for a nonsinusoidal periodic current has not yet been agreed upon. (2) The imaginary part of the impedance is called the reactance, symbolized by X and measured in ohms. The real part of the impedance is the resistance R, Z = R + jX. Note: Reactance is inductive if the imaginary part of impedance is greater than zero, and capacitive if less than zero.

Read Out
A term used with printed circuit boards and printed circuit connectors, meaning the ability to make contact with certain circuits. Example: a double read-out printed circuit connector will permit two wires to be connected to any one circuit on the printed circuit board.

Rear Insertion-Front Release
The type of connector whose contacts are inserted from the rear, with the proper insertion tool, and released from the rear with the removal tool inserted from the face (front) of the connector.

Rear Insertion-Rear Release
The type of connector whose contacts are both inserted and removed from the rear of the connector with the proper tools. This does not require demating of the connector installation.

Rear Release Contacts
Connector contacts that are released and removed from the rear (wire side) of the connector retention device. The removal tool engages the contact from the rear and pulls the contact out of the connector contact retainer.

Rear Seal
That design feature that provides an environmental seal at the rear of plug or receptacle. It generally consists of rubber grommets that fit between the wire and sidewall of the insert cavities or consists of a flat sheet of rubber that fits between the back up of plate and insert and insert of plug or receptacle. This flat sheet of rubber is sometimes called family or group seal since it contains the same number of holes as the insert has cavities. It is through these holes that wires are threaded to the connector contacts.

The part of a connector system that is fixed or stationary when not interconnected. The receptacle may be mounted to a rack, rail, panel, or printed wiring board. In the case of a wire to wire, fiber to fiber, or cable to cable "flying" connector systems and board to board connector systems, the receptacle is part of the system, that will capture the contacts within its body. The contacts can be either pins or sockets.

Process of recombining, spurs, runners and molding by-products with original (virgin) materials to produce a final product certified to the original manufacturers specifications including fiber length and content.

Rectangular Connector
A connector that is basically rectangular and has a basically rectangular mating face.

Reference Corner
That corner of the wrap post at which the insulated wire makes its first indentation and from which the number of wrapped turns is counted.

Reflection Coefficient
The reflection coefficient is the ratio of the reflected to incident voltages at any given point. The reflection coefficient is given by: EQUATION NEEDED where ZL is the fixture or specimen impedance and ZO is the specimen environment impedance. NOTE  In the time domain, the reflection coefficient symbol typically used is rho (*), while Gamma (*) is used for frequency domain measurements.

Reflow Soldering
Method of soldering where the solder joint is made by melting the solder pre-coated on the mating components.

Grinding of spurs and runners or any by-product of the molding process.

Property of a magnetic circuit that determines the total magnetic flux in the circuit when a given magnetomotive force is applied.

Removable Contact
A contact that can be mechanically joined or remove from an insert. Usually, special tools are required to lock the contact in place or remove it for repair or replacement.

Removal Tool
A device used to remove a contact from a connector.

Resilient Contact
A contact having elastic properties to provide a force to its mating part.

Property of a conductor that determines the current produced by a given difference of potential. The ohm is the practical unit of resistance, and the symbol R designates resistance in ohms.

Restricted Entry
A design feature incorporated in a female contact or insulator to prevent the entry of an oversize pin or test probe.

Return Loss
The ratio in decibels (dB) of the power incident upon the impedance discontinuity to the power reflected from the discontinuity. The equation for return loss calculated from the reflection coefficient is: Return Loss = 20 log10|*| = 20 log10 |s11|

Return Mechanism
A device of a crimping tool to return the tool to the full open position when the crimping operation is completed.

Reusable Insulation Displacement Termination
An insulation displacement termination that can be used more than once.

RF Connector
Connectors used for connecting or terminating coaxial cable.

Ribbon Cable
A cable of individually insulated round conductors lying parallel and coplanar, being held together by means of films, adhesives, woven textile yarn, or molded insulation material.

Right Angle Connector
A connector in which the axis of the cable outlet or termination connections are at a right-angle with the axis of the mating face.

Right Angle Edge Connector
A connector that is mounted along an edge of, and soldered to, the circuits of a printed circuit board. Contacts of the connector are oriented at a right angle to the termination pins soldered into the printed circuit board, allowing the circuit board to be plugged into a mother board or wired backpanel rack.

Ring-Tongue Terminal
A terminal having a round-end tongue with a hole to accommodate a screw or stud.

Rise Time
The time required for a voltage step to occur, measured between its initial value and final value, typically from 10% to 90% levels.

Rise Time Degradation
The increase in rise time to a theoretically perfect (zero rise time) voltage step when the specimen is inserted in the transmission path. The formula used to calculate the rise time degradation for gaussian signals from 10% to 90% is as follows: Rise time degradation = NEEDS FORMULA

Rosin Flux
The mildest and least effective of solder fluxes (Type R). To increase rosin flux efficiency, small amounts of organic activating agents are added. Type RA, fully activated rosin flux, is the flux most commonly used for electrical connections.