"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"
The previous portion of the C listing;
"C" Terms
CHANNEL. A carrier frequency assignment, usually with a fixed bandwidth.
CHARACTER. A letter, digit, or other symbol that is used as part of the organization, control, or
representation of information. [ASCII Code Table]
CHARACTERISTIC IMPEDANCE. [Zo] The ratio of voltage to current at any given point on a transmission
line represented by a value of impedance. A measure of the electromagnetic coupling between the signal conductor and its return path. The impedance of a circuit that, when connected to the output terminals of a uniform transmission line of arbitrary length, causes the line to appear infinitely long. A uniform line terminated in its characteristic impedance will have no standing waves, no reflections from the end, and a constant ratio of voltage to current at a given frequency at every point on the line.
CHARGE. Represents electrical energy. A material having an excess of electrons is said to have a
negative charge. A material having a shortage of electrons is said to have a positive charge.
CHARGE CYCLE. The period of time that a capacitor in an electrical circuit is storing a charge.
CHASSIS. An equipment case. An equipment enclosure used to hold circuit boards or other components. Also refer to Styles of Equipment Enclosures.
CHASSIS GROUND. The potential of an equipment chassis. The attached graphic shows how to connect a printed wire board [PWB] ground to chassis ground. Additional information may be found on Grounding in Chassis Design.
Circuit Ground with Chassis Ground
Chatter, Contact. The undesired opening of mating contacts resulting from uncompensated AC operation, or external shock and vibration [Relay]. Relay Manufacturers
CHECK BIT. A bit, such as a parity bit, derived from and appended to a bit string for later use in error detection and possibly error correction.
CHECK-SUM. A number that has been calculated as a function of some message, by adding up the bytes in the message. The [message] data is summed with out regard overflow. Perhaps this was what early checksums were. Today, however, although more sophisticated formulae are used, the term "checksum" is still used and interchangeable with the term CRC.
|
CHIP INDUCTOR. A surface mount inductor. Refer to MIL-PRF-83446; Coils, Chip, Fixed or Variable, General Specification. Inductor Manufacturers |
 Chip Inductor |
Chip Carrier. A low-profile four-sided (rectangular) part package, whose semiconductor chip cavity or mounting area is a large fraction of the package size.
| CHOKE. An inductor used to impede the flow of pulsating dc or ac by means of self-inductance. A choke is designed to have a high reactance to a particular frequency. Common-mode chokes are used to protect from EMI. High frequency chokes may be called ferrite chokes or choke baluns. RF chokes normally have air core, while low frequency chokes have ferromagnetic iron cores. [Choke Manufacturers] |
 Choke |
CHOKE JOINT. A joint between two sections of waveguide that provides a good electrical connection without power losses or reflections.
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