User manual FLUKE AMH-38

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Manual abstract: user guide FLUKE AMH-38

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[. . . ] AMH-38TM/AMH-100TM Automated Mass Handling System for PG7000 Piston Gauges Operation and Maintenance Manual © 2007 DH Instruments, a Fluke Company © 2007, DH Instruments, a Fluke Company All rights reserved. Information in this document is subject to change without notice. No part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of DH Instruments, a Fluke Company 4765 East Beautiful Lane Phoenix AZ 85044-5318 USA. DH Instruments makes every effort to ensure the accuracy and quality of its published materials; however, no warranty, expressed or implied, is provided. [. . . ] Clear the AMH and test its operation: Press [SPECIAL], <8AMH>, <2control>, <3loadall>. The trim mass tray should rise approximately 2. 5 cm (1 in. ) above the top of the lifter, followed by the sound of the main mass selection columns rotating. Then the trim mass tray should be lowered back down. The steps of this procedure are commented on the PG Terminal display as they occur. If the sequence does not complete and/or any error messages are observed, see Section 6 and Table 4 for troubleshooting assistance. If the sequence completes, the AMH mass handler has been cleared and put into a known state in which all mass holding ledges and pins are retracted so that it can safely be slipped down over the mass set and installed on the PG7000 Platform. If desired, visually inspect the condition of the AMH mass handler by carefully tipping the AMH to look inside. The main mass selection columns should have their all flat surfaces (no ledges) oriented towards the center and all binary mass selection pins should be retracted (see Section 3. 1). When this step is complete, the AMH mass handler is ready to be installed on the PG7000 Platform (see Section 3. 2. 1). Page 17 © 2007 DH Instruments, a Fluke Company AMH-38TM AND AMH-100TM OPERATION AND MAINTENANCE MANUAL NOT E S © 2007 DH Instruments, a Fluke Company Page 18 3. OPERATION 3. 3. 1 OPERATION GENERAL OPERATING PRINCIPLES Numerical reference in this section refers to Figure 8. The purpose of the AMH-38 or AMH-100 system is to automatically load specified values of mass onto the PG7000 piston. This is accomplished by lifting the complete mass set up off and above the pistoncylinder to the mass selection position, selecting the individual masses to be loaded and retained, and then placing the masses to be loaded back onto the piston. To accomplish the mass lifting, selection and lowering function, the AMH mass handler uses four main sub-systems. These systems are present in both the AMH-38 and AMH-100 models. Electronic and electrical controls(7): The AMH electronic and electrical controls are located just above the mass lifter, under a protective cap. These support the AMH operating logic, a proximity sensor to detect mass load position, reading of the main mass selection column switches, operation of the column rotating motor and actuation of the pneumatic control solenoid valves. Mass lifter(8): The mass lifter is used to lift the entire mass load to the mass selection position and then to lower the selected masses onto the piston. The mass lifter is pneumatically actuated. A flexible diaphragm(4) is connected to a lifting assembly(5). 9) can be actuated to admit or exhaust drive air pressure to and from the volume under the diaphragm. Admitting drive pressure forces the lifting assembly up. With AMH-38, the pressure is exhausted outside the vacuum chamber, to the AMH drive vacuum supply when there is vacuum in the chamber. As the mass lifting assembly (5) rises, it engages a ledge on the mass lifting shaft(6), pushing it up. [. . . ] 2. 5. 1 causing bell not to seat properly on piston when AMH lowers mass. Operating with a vacuum reference in the vacuum chamber without applying drive vacuum to the AMH. Operating with drive vacuum port plugged. Apply drive vacuum to the AMH when operating with vacuum in the vacuum chamber. [. . . ]

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