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412440

更新时间： 2024-09-15 06:27:03
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EXTECH /
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4 - 20mA Calibration Checker

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412440 数据手册

  
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 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:  
Overload:  
4mA, 12mA and 20mA  
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 (781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact  
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  
ꢀꢁ  
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  
Copyright © 2006 Extech Instruments Corporation  
All rights reserved including the right of reproduction in whole or in part in any form.  
412440 V2.1 12/06  
1

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