412440 V2.1 12/06

Support line (781) 890-7440

Technical support: Extension 200; E-mail: support@extech.com

Repair & Returns: Extension 210; E-mail: repair@extech.com

Product specifications subject to change without notice

For the latest version of this User Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Extech Instruments Corporation, 285 Bear Hill Road, Waltham, MA 02451

User’s Guide

4 – 20mA Calibration Checker

Model 412440

Features

Three check points (4, 12, 20mA)

Push-button range selection for one hand operation

Bright red LEDs indicates simulation point, low battery

power and overload (over 240 ohms)

Description

The current loop checker is a handheld battery operated device that provides a quick and easy simulated output of

4mA, 12mA and 20mA for use in testing and calibrating instruments. Also, it is the ideal device to set up indicating

ranges on panel meters and controllers.

Operation

Plug the 60" coiled calibration cable into the checker and connect the spade lugs to the device under test. Using the

calibrator’s push button, select the desired calibration point and check the device under test for proper display or other

desired response. If the device under test responds within specification, then it can be considered in proper calibration.

If the device under test does not respond within specification, calibration is required.

Specifications:

Accuracy:

±0.1mA

Check Points:

4mA, 12mA and 20mA

Overload:

When load exceeds 240 ohms @ 20mA, 400 ohms @ 12mA, 1,200 ohms @ 4mA

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment

(a six month limited warranty applies to sensors and cables). If it should become necessary to return the instrument for service during or beyond the

information. A Return Authorization (RA) number must be issued before any product is returned to Extech. The sender is responsible for shipping

charges, freight, insurance and proper packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the user

such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification. Extech specifically

disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental or

consequential damages. Extech's total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no other

warranty, whether written or oral, is expressed or implied

Copyright © 2006 Extech Instruments Corporation

All rights reserved including the right of reproduction in whole or in part in any form.