Extech 412440-S Operating Manual

User’s Guide

4 – 20mA Calibration Checker
Model 412440

Features

¾ Three check points (4, 12, 20mA)
¾ Push-button range selection for one hand operation
¾ 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 di splay or other
desired response. If the device under test responds within specification, then it can be considere d 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
warranty period, contact the Customer Service Department at [phone] ext. 210 for authorization or visit our website www.extech.com
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

Technical support: Extension 200; E-mail: [e-mail]

Repair & Returns: Extension 210; E-mail: [e-mail]

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

Support line [phone]

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

Copyright © 2006 Extech Instruments Corporation

for contact

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412440 V2.1 12/06