18WuD2x

electronic hygrometer • electronic power supply 247
electronic hygrometer An electrical device for
measuring relative humidity, whose sensitivity
and stability have been increased by the addition
of active amplifying devices.
electronician See ELECTRONICS TECHNICIAN.
electronic induction See ELECTROSTATIC IN-
DUCTION.
Electronic Industries Association Abbreviation,
EIA. An American association of electronic manufacturers
and engineers. It sets standards, disseminates
information, provides industrygovernment
liaison, and maintains public relations
for the industry.
electronic information processing The use of
electronic equipment (especially digital computers
and attendant devices) to perform mathematical
operations on data entered into the system in
the form of electrical signals. Also see DATA PRO-
CESSING.
electronic instrument An instrument whose circuit
uses active devices for increased sensitivity
over that of the electrical counterpart, and for
minimum loading of a device under test. Compare
ELECTRICAL INSTRUMENT.
electronic integrator A active device (such as an
operational amplifier) for performing mathematical
integration. Also see INTEGRATOR, 2.
electronic intelligence 1. Information exchanged
by electronic means. Examples: radio messages,
radar information, and computer data. 2. The
faculties of reasoning and decision making, as
apparently simulated by a high-level computer.
electronic interference The malfunctioning of a
device because of nearby currents, voltages, or
electromagnetic fields.
electronic inverter An electronic device for converting
direct current (dc) to alternating current
(ac). Typically, an inverter is a transistorized
square-wave oscillator inductively coupled to ac
output terminals. The dc to be inverted energizes
the transistors, which perform the switching
function at the rate determined by the components
of the circuit. Also see INVERTER, 1.
+
dc Input
−
Oscillator
Amplifier
electronic inverter
ac
Input
electronic jamming The deliberate transmission
of electromagnetic energy for the purpose of interfering
with the operation of a device or devices.
electronic key 1. For telegraphy (radio or wire), an
electronic circuit that generates a continuous
string of accurately spaced and timed Morse code
dots or dashes, depending on its lever’s position
(right or left). 2. For telegraphy (radio or wire), a
keyboard that produces perfectly timed Morse
code output that corresponds to the operator’s
typed input. 3. An electronic device for opening
an electronic lock.
electronic keyer See ELECTRONIC KEY, 1.
electronic lock A lock that will open only after application
of a special coded sequence of signals.
electronic mail Also called e-mail. A communications
system that allows people to leave digital
text messages for each other. It is popular among
users of personal computers. Operates through
the telephone lines using terminal emulation
software and a modem. It can also be used via
amateur radio packet communications.
electronic microammeter See FET CURRENT
METER and TRANSISTOR CURRENT METER.
electronic microvoltmeter See MICROVOLT-
METER.
electronic milliammeter See FET CURRENT ME-
TER and TRANSISTOR CURRENT METER.
electronic millivoltmeter A millivoltmeter that
uses an amplifier ahead of an analog or digital indicator
to provide high input impedance and increased
sensitivity.
electronic multimeter A voltohm-milliammeter
that uses active amplifying devices. Also see
ELECTRONIC INSTRUMENT.
electronic multiplier A device, such as a Hall generator,
whose output is equal (or proportional) to
the product of two inputs (i.e., it can perform
arithmetic multiplication).
electronic music 1. Music produced by a combination
of electronic oscillator, amplifier, and
loudspeaker. A number of successful instruments
have been developed. See, for example,
ELECTRONIC CARILLON, ELECTRONIC ORGAN,
ELECTRONIC PIANO, and THEREMIN. 2. The
electronically amplified sounds of conventional
musical instruments.
electronic organ A musical instrument with a keyboard
similar to that of a conventional organ, in
which tones produced by oscillators or electrically
driven reeds are processed and amplified for
delivery to a system of loudspeakers.
electronic packaging See ENCAPSULATION.
electronic part A lowest replaceable unit, or component,
in an electronic circuit.
electronic phase meter An electronic instrument
for measuring phase difference. Direct readings,
in degrees of lead or lag, are visible on an analog
scale or as a digital readout.
electronic photoflash A transistorized light-intensity
meter. Also see ELECTRONIC INSTRUMENT.
electronic piano A musical instrument having the
keyboard of a conventional piano and provided
with electronic amplification.
electronic power supply A power supply using
transistors or integrated circuits for stabilization
and output control.