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DH Instruments MOLBOX ANALOG CIRCUIT User Manual

Calibration software
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molbox™ Analog Circuit
Calibration Software
User's Manual
© 2002 DH Instruments, Inc.

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  • Page 1 molbox™ Analog Circuit Calibration Software User’s Manual © 2002 DH Instruments, Inc.
  • Page 2 High pressure liquids and gases are potentially hazardous. Energy stored in these liquids and gases can be released unexpectedly and with extreme force. High pressure systems should be assembled and operated only by personnel who have been instructed in proper safety practices. ©...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS T A B L E O F C O N T E N T S ............. . . I F I G U R E S .

  • Page 4: Manual Conventions

    MFC SWITCHBOX USER’S MANUAL Table 1. DHI Authorized Service Providers ....................13 Figure 1 Communications Setup Screen ...................... 9 Figure 2 molbox Analog Calibration Software ver 1.2b DH Instruments 1995 Screen ....... 9 Figure 3 Set Point Test Screen........................9 Figure 4 molbox Analog Calibration Cable ....................

  • Page 5: M O L B O X A N A L O G C I R C U I T C A L I B R A T I O N S O F T W A Re

    1. INTRODUCTION PRODUCT OVERVIEW The purpose of this software is to calibrate the MFC analog control circuit in molbox1™. There are three separate lines that are individually calibrated by the software. First there is the set line that is used to set MFC set points.
  • Page 6 MFC SWITCHBOX USER’S MANUAL © 1997-2002 DH Instruments, Inc. Page 2...

  • Page 7: R U N N I N G A C A L I B R A T I On

    2. RUNNING A CALIBRATION OVERVIEW Before running a calibration, connect the 25 pin connector end of the calibration cable to the MFC port and the other end to the voltage or current measuring channel of the multimeter. The red plug is positive voltage, the black plug is negative voltage, the blue plug is positive current and the white plug negative current.

  • Page 8: Recalibrate

    MFC SWITCHBOX USER’S MANUAL RECALIBRATE A recalibration determines new calibration coefficients for the set, measure and sense lines based on the supplied multimeter readings. To perform a recalibration, choose either a Voltage or Current mode Recalibration from the Test Menu (see Section 3.6). The software will set 5 and 0.5 V or 20 and 5 mA depending on the type of calibration selected.

  • Page 9: M E N U O P T I O Ns

    3. MENU OPTIONS FILE: SAVE DATA (SHORTCUT: CTRL+S) When save is invoked, the contents of the display box are saved into a text based data file. If this option is selected after a calibration check or recalibration, a default file name is created based on the Year + Julian Day + V (or I based on last mode) and a run increment.

  • Page 10: Test: Test Set Value (Shortcut: Ctrl+T)

    MFC SWITCHBOX USER’S MANUAL TEST: TEST SET VALUE (SHORTCUT: CTRL+T) The purpose of the Test Set Value option is to allow a user to insure that the values between the calibration points are within the molbox1 specifications. Values set with this option are corrected by the molbox1 sense line, while the set values of a Calibration Check are not.

  • Page 11: T R O U B L E S H O O T I Ng

    4. TROUBLESHOOTING GENERAL PROCEDURES If the calibration continues to fail due to excessive errors (out of spec), make sure that a molbloc is properly connected to the molbloc port A and/or B on the molbox and restart the calibration from the beginning by selecting Check Calibration.
  • Page 12 MFC SWITCHBOX USER’S MANUAL © 1997-2002 DH Instruments, Inc. Page 8...

  • Page 13: F O R M S / D I A G R A Ms

    5. FORMS / DIAGRAMS SERIAL COMMUNICATIONS FORM Figure 1 Communications Setup Screen ANALOG CALIBRATION FORM Figure 2 molbox Analog Calibration Software ver 1.2b DH Instruments 1995 Screen SET POINT TEST FORM Figure 3 Set Point Test Screen Page 9 © 1997-2002 DH Instruments, Inc.

  • Page 14: Example .Cfg File

    MFC SWITCHBOX USER’S MANUAL EXAMPLE .CFG FILE This file keeps a history of the current and previous analog calibration values. The name of the file is based on the molbox sn #. The UPDATE line represents the last time the particular value was updated. The order of the values is: set adder, set mult, sense adder, sense mult, measure adder, and measure mult.

  • Page 15: Cables

    5. FORMS / DIAGRAMS CABLES Figure 4 molbox Analog Calibration Cable Figure 5 Old Style molbox Analog Calibration Cable Page 11 © 1997-2002 DH Instruments, Inc.
  • Page 16 MFC SWITCHBOX USER’S MANUAL © 1997-2002 DH Instruments, Inc. Page 12...

  • Page 17: W A R R A N T Y S T A T E M E N

    6. WARRANTY STATEMENT Except to the extent limited or otherwise provided herein, DH Instruments, Inc. (DHI) warrants for one year from purchase, each new product sold by it or one of its authorized distributors, only against defects in workmanship and/or materials under normal service and use. Products which have been changed or altered in any manner from their original design, or which are improperly or defectively installed, serviced or used are not covered by this warranty.
  • Page 18 MFC SWITCHBOX USER’S MANUAL © 1997-2002 DH Instruments, Inc. Page 14...

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