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Model 242L Operations Manual

1.1 GLOSSARY

A - Ampere

C - Celsius

Component - Any electrical or electronic device

DC - Direct Current

Firmware – Program code embedded into a microcontroller unit

Hz - Hertz

IC - Integrated Circuit

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

ms - millisecond

MCU - Micro Controller Unit or microcontroller unit

MOV - Metal Oxide Varistor

Opto-coupler – An integrated circuit that provides electrical isolation

PCB - Printed Circuit Board

RMS - Root-Mean-Square

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 242L is a dual channel DC Isolator unit designed to meet Caltrans

specifications TEES 2009 including Errata #2 (December 2014). The isolator unit occupies one position

of a 170 standard input file. The isolator unit card incorporates a double-sided 44 pin edge connector

for the connection of power, input, and output signals. Each channel has individual front panel controls

for testing the operational mode, and high intensity front panel LEDs which are used to indicate the

output state. Outputs are optically-isolated solid-state transistors. The Model 242L is powered from the

24VDC Cabinet Power Supply and does not require AC Line.

1.3 GENERAL CHARACTERISTICS

Each channel of the Model 242L provides input hysterisis and digital filtering to qualify the input signal.

An input signal must meet the minimum pulse requirements specified in section 1.7.5 in order to

produce a valid output. The output pulse width for both channels can be set to 100 milliseconds

minimum by installing jumper "100ms" (J4-A).

Both the input and output circuits have been designed for maximum protection from electrical transients.

The inputs have been designed to withstand the discharge of a 10 uF capacitor charged to +/- 1000

Vdc directly across the input pins, and a discharge of a 10 uF capacitor charged to +/- 2000 Vdc applied

through a source impedance of 5 ohms across the input pins or to Equipment Ground. The outputs are

protected by a transient clamp diode.

Eberle Design Inc.

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