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print • private branch exchange 555
tem, that causes data to be placed on paper or
onto the output screen. 3. The alphanumeric output
of a computer or data terminal.
printed capacitor A two-plate capacitor formed on
a printed circuit.
printed circuit A pattern of conductors (corresponding
to the wiring of an electronic circuit)
formed on a board of insulating material, such as
a phenolic, by photo-etching, silk-screening of
metallic paint, or by the use of pressure-sensitive
preforms. The leads or pins of discrete components
are soldered to the printed metal lines at
the proper places in the circuit, or the components
can be formed along with the conductors.
Also see ETCHED CIRCUIT.
printed-circuit board A usually copper-clad plastic
board used to make a printed circuit.
printed-circuit lamp A baseless lamp having flexible
leads for easy soldering or welding to a
printed circuit.
printed-circuit relay A usually small relay provided
with pins or lugs for easy solder connection
to a printed circuit.
printed-circuit switch A rotary switch whose contacts
and contact leads are printed on a substrate.
printed-circuit template Also called etching pattern.
A drawing for the purpose of making
printed-circuit boards by photographic means.
printed coil A flat, spiral coil formed on a printed
circuit.
printed-circuit template
printed component A component formed on the
substrate of a printed circuit. See, for example,
PRINTED CAPACITOR, PRINTED COIL, and
PRINTED RESISTOR.
printed display See DATA PRINTOUT, 2.
printed element See PRINTED COMPONENT.
printed inductor See PRINTED COIL.
printed resistor A resistor printed or painted on a
printed circuit.
printed wiring The printed or etched metal lines
that serve as the conductors in a printed circuit.
printer In computer and calculator operations and
in measurement procedures, a readout device
that prints a permanent record of output data.
There are several types, including the dot-matrix
printer, the daisy-wheel printer, the inkjet printer,
and the laser printer. Some printers, such as the
daisy-wheel type, can render only text data;
others, such as the laser type, can print highresolution
graphic images, sometimes in color.
printing calculator 1. An electronic calculator
that supplies a printed record of the results of a
calculation. 2. For a programmable calculator,
the results, a record of program steps, and plots
of curves.
printing digital voltmeter Abbreviation, PDVM. A
digital voltmeter that delivers a printed record of
a voltage reading, in addition to the usual digital
readout of the voltage.
printing telegraph 1. A telegraph that prints the
received message on a tape or page. 2. See TELE-
TYPEWRITER.
printing wheel See PRINT WHEEL.
print format The form of data transmitted by a
computer program to a printer (e.g., plain text,
graphics, color graphics, etc.).
printout See DATA PRINTOUT, 1, 2.
print-through In prerecorded magnetic tape on a
reel or cassette, the transfer of magnetism between
layers of the rolled-up tape.
print wheel In a daisy-wheel printer, the rotatable
wheel on whose rim the letters, numbers, and
other symbols are inscribed in relief.
priority indicator In data transmission, a code
that specifies the order of importance of a message
in a group of messages to be sent.
priority processing In multiple programming operations,
a system for ascertaining the order of
processing for different programs.
privacy code 1. A subaudible tone used in cordless
telephone systems to reduce the chances of
interference between phones operating on the
same channel in close proximity. 2. A subaudible
tone used in radio transmissions, especially in
conjunction with repeaters, to allow only those
stations with the proper code to be received. 3. A
tone-burst sequence at the beginning of a transmission
that actuates a receiver, allowing only
those stations with the proper code to be received.
privacy equipment Devices, such as speech
scramblers and digital encryption programs, that
provide some measure of secrecy in communications.
privacy switch In a telephone amplifier, a switch
(usually a pushbutton) for muting outgoing messages.
private automatic exchange Abbreviation, PAX. A
dial telephone system for use within an organization
and having no connection to the central office.
Compare PRIVATE BRANCH EXCHANGE.
private branch exchange Abbreviation, PBX. A
telephone system, complete with a private manually
operated switchboard and individual telephone
sets, installed and operated on private