DRAKE 4000 series II Guide de l'utilisateur télécharger pdf (Page 6)

4000 Series II - EASi-COM II User Guide

STA0309 - Issue 2.0 Page v of x

LCD A

iquid

rystal

isplay is a type of display used in digital watches

and many portable computers. LCD displays utilize two sheets of

polarizing material with a liquid crystal solution between them. An

electric current passed through the liquid causes the crystals to

align so that light cannot pass through them. Each crystal, there-

fore, is like a shutter, either allowing light to pass through or block-

ing the light.

LED A

ight

mitting

iode is an electronic device that lights up when

electricity is passed through it.

Listen Route An audio route to the Control Panel from a source. The audio is nor-

mally heard on the Control Panel's Loudspeaker or Headset.

LS The

oud

peaker is a device that converts electrical signals into

sound waves.

MB A

ega

yte is a term used for data size: 1MB = 1,024 bytes

MHz

ega

ert

is a term used to express the speed of a waveform. 1

MHz = 1 million Hertz (q.v.), or cycles per second. The speed of

microprocessors, called the clock speed, is measured in megahertz.

N/C A

ormally

losed contact is a contact that is always closed until

operated.

N/O A

ormally

pen contact is a contact that is always open until oper-

ated.

NID A

ntrusive

ownload is a means of sending new configuration

information from a personal computer to a Drake CSU while caus-

ing minimum interruption to the live operation of the system.

NVRAM

on-

olatile

andom

ccess

emory is a type of memory that

retains its contents when power is turned off. One type of NVRAM is

SRAM that is made non-volatile by connecting it to a constant

power source such as a battery. Another type of NVRAM uses EEP-

ROM chips to save its contents when power is turned off. In this

case, NVRAM is composed of a combination of SRAM and EEP-

ROM chips.

O/P

PCB A

rinted

ircuit

oard is a thin plate on which silicon chips and

other electronic components are placed.

Pot. A

Pot

entiometer is a variable resistance device used to control

sound levels.

PSU A

ower

upply

nit is a unit which converts an electrical supply to

one suitable for driving a given piece of equipment. Typically, a

power supply unit will convert from alternating current to direct cur-

rent and will step down the supply voltage.

1 2 3 4 5 6 7 8 9 10 11 ... 30 31

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DRAKE 4000 series II Guide de l'utilisateur Page 6

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