EDI 222 Series Посібник з експлуатації - Сторінка 3
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1.1 GLOSSARY
A - Ampere
o
C - Celsius
Component - Any electrical or electronic device
Crosstalk – a symptom of interference between two adjacent loops running at similar frequencies
∆L/L – Change of inductance divided by the nominal inductance
DC - Direct Current
DIP – Dual Inline Package
Firmware - A computer program or software stored permanently in PROM
FLASH – An IC Memory with nonvolatile, electrically erasable, programmable features
Hz - Hertz
IC - Integrated Circuit
Inductance - The property of an electric circuit by which an electromotive force is induced in it as the
result of a changing magnetic flux
Jumper - A means of connecting/disconnecting two or more conductive by soldering/desoldering a
conductive wire or by PCB post jumper
LED - Light Emitting Diode
LOGIC - Negative Logic Convention (Ground True) State
mA - milliAmpere
uH - microHenry
ms - millisecond
MCU - Micro Controller Unit
N.C. - Normally closed contact
N.O. - Normally open contact
Q Factor – A numerical rating for the quality of a resonant circuit. A higher number indicates lower
losses.
PCB - Printed Circuit Board
RAM - Random Access Memory
RMS - Root-Mean-Square
ROM - Read Only Memory Device
s – second
Schmitt Circuit – a circuit that provides hysterisis in the threshold
SW – Switch
uF - microfarad
VAC - Voltage Alternating Current
VDC - Voltage Direct Current
1.2 GENERAL DESCRIPTION
The Eberle Design Model 222 is a dual channel inductive loop vehicle detector sensor unit designed
to meet Caltrans specifications TEES 2009 including Errata #2 (December 2014). The sensor unit
occupies one position of a 170 standard input file. The sensor unit card incorporates a double-sided
44 pin edge connector for the connection of power, loops and call signals. Each channel has
individual front panel controls for setting sensitivity, operational mode and frequency, and is equipped
with high intensity front panel LEDs which are used to indicate the detect state. Call outputs are
optically-isolated and solid-state transistors.
Eberle Design Inc.
Model 222
Operations Manual
Page 1