DH Instruments COMPASS FOR MOLBOX User Manual

Flow calibration software
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COMPASS
for molbox™
Flow Calibration Software
User's Manual
© 1998-2003 DH Instruments, Inc.

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Summary of Contents for DH Instruments COMPASS FOR MOLBOX

  • Page 1 ® COMPASS for molbox™ Flow Calibration Software User’s Manual © 1998-2003 DH Instruments, Inc.
  • Page 2  COMPASS for molbox™ User’s Manual © 1998 - 2003 DH Instruments, Inc. 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, Inc. 4765 East Beautiful Lane, Phoenix AZ 85044-5318 USA.
  • Page 3: Table Of Contents

    ABOUT THIS MANUAL ................XII INTRODUCTION ......................... 1 PRODUCT OVERVIEW .........................1 GETTING STARTED......................3 OVERVIEW............................3 SYSTEM REQUIREMENTS........................3 INSTALLING COMPASS FOR molbox ....................3 2.3.1.1.1.1 OR............................3 2.3.2 UPGRADING FROM VERSIONS LOWER THAN 4.00................3 2.3.3 [TOOLS], [FILE UPGRADE WIZARD] ......................5 RUNNING THE PROGRAM ........................5 UNINSTALLING ............................5...
  • Page 4  COMPASS for molbox™ User’s Manual 5.1.7.2 TEST DEFINITION SETUP .....................25 5.1.7.3 RUN THE TEST........................26 5.1.8 EXAMPLE #8 ............................26 5.1.8.1 DUT DEFINITION SETUP .......................26 5.1.8.2 TEST DEFINITION SETUP .....................27 5.1.8.3 TEST HARDWARE SETUP.....................27 5.1.8.4 SET UP DATA GRID .......................27 5.1.8.5 RUN THE TEST........................28 MAIN SCREEN .........................
  • Page 5  COMPASS for molbox™ User’s Manual 8.5.7 [CONDITIONS] TAB ..........................75 8.5.8 [READ] TAB ............................76 8.5.9 [SET] TAB..............................78 [SETUP], [TEST]....................... 81 OVERVIEW............................81 CREATING TEST DEFINITIONS......................81 EDITING TEST DEFINITIONS......................82 TEST DEFINITION SELECTOR ......................82 TEST DEFINITION EDITOR ........................82 9.5.1 TOOLBAR..............................83 9.5.2 <POINTS> TABLE...........................84 9.5.3 [POINTS] TAB ............................86 9.5.4...
  • Page 6  COMPASS for molbox™ User’s Manual 13.2.4.2 <INSERT SPECIAL CHARACTER>..................149 13.2.4.3 <COMMAND TERMINATOR> .....................149 13.3 RS-232 INTERFACE ......................... 149 13.3.1 RS-232 SETUP ............................149 13.4 IEEE-488 INTERFACE ........................150 13.5 DEVICENET INTERFACE ......................... 150 13.6 [TOOLS], [REMOTE COMMUNICATIONS] ..................150 [TOOLS], [FLOW UNIT EDITOR] ................... 153 14.1 OVERVIEW............................
  • Page 7  COMPASS for molbox™ User’s Manual DATA FILES ........................181 18.1 OVERVIEW............................181 18.2 DATA FILE CREATION........................181 18.3 NAMING AND STORING DATA FILES .................... 181 18.4 DATA FILE STRUCTURE ......................... 182 18.4.1 DATA FILE FIELDS..........................183 CALCULATIONS ......................187 19.1 OVERVIEW............................
  • Page 8: Tables

     COMPASS for molbox™ User’s Manual Table 1. COMPASS Version Compatibility....................4 Table 2. Tools Available On The Run Toolbar ..................31 Table 3. Tools Available On The Display Toolbar ..................32 Table 4. <Tare molbox> Panel Fields ...................... 35 Table 5.
  • Page 9  COMPASS for molbox™ User’s Manual Table 44. [Options], [Maintain Lists] Tab Fields .................. 126 Table 45. [Options], [Initialize Test] Tab Fields..................127 Table 46. [Options], [Run Test] Tab Fields ................... 128 Table 47. [Options], [Run Test] Tab, [Manual DUT P and T Entry Method] Fields ......130 Table 48.
  • Page 10  COMPASS for molbox™ User’s Manual Figure 1. Example 1, DUT Range Setup....................14 Figure 2. Example 1, DUT Read Command Setup................... 15 Figure 3. Example 1, molbox1 Reference Setup ..................16 Figure 4. Example 1, System Configuration....................16 Figure 5. Example 1, DUT Interface Setup ....................17 Figure 6.
  • Page 11  COMPASS for molbox™ User’s Manual Figure 44. DUT Definition Editor, [Conditions] Tab................. 75 Figure 45. DUT Definition Editor, [Read] Tab................... 76 Figure 46. DUT Definition Editor, [Set] Tab ....................78 Figure 47. Test Definition Editor, <Toolbar> .................... 83 Figure 48. Test Definition Editor, <Test Points> Tab................84 Figure 49.
  • Page 12  COMPASS for molbox™ User’s Manual Figure 93. COMPASS Report Editor....................... 164 Figure 94. <Find> Panel ......................... 169 Figure 95. <Field Insertion Tool> Panel ....................171 Figure 96. <Multi Cycle Data File Options> Panel................172 Figure 97. Page Setup Screen........................ 173 Figure 98.
  • Page 13: User Registration

     COMPASS for molbox™ User’s Manual ™ COMPASS for molbox ® Flow Calibration Software Please fill out this registration sheet and return it to DH Instruments. Registering as a user will ® allow us to contact you with important information about COMPASS including product upgrades, possible recalls and product announcements.
  • Page 14: About This Manual

    User’s Manual Manual Conventions This manual provides the user with the basic information necessary to set up and run COMPASS for molbox. It also includes a great deal of additional information provided to help you optimize COMPASS use and take full advantage of its many features and functions.
  • Page 15: Introduction

    , the complete flow calibration software package for users of DHI molbloc/molbox flow transfer standards. COMPASS for molbox is designed to supply the missing link needed to get from individual automated hardware components to an automated calibration system and from owning a great flow standard to performing a wide variety of special calibrations and tests.
  • Page 16  COMPASS for molbox™ User’s Manual Page 2 © 1998-2003 DH Instruments, Inc.
  • Page 17: Getting Started

    10 MB free hard disk space INSTALLING COMPASS FOR molbox Insert the COMPASS for molbox CD into the CD drive. If the auto run feature is enabled on the PC, the setup application runs automatically. If the setup program does not run after 10 seconds, press the Windows [Start] button and select [Run].
  • Page 18: Table 1. Compass Version Compatibility

    The file Upgrade Wizard is required to incorporate the Test File information into the new database format. COMPASS for molbox versions 4.00 and higher do not contain DUT data acquisition information. This information is now contained in the DUT Definition.
  • Page 19: Tools], [File Upgrade Wizard]

    To uninstall COMPASS, use the <Remove COMPASS for molbox> icon in the program group created during installation. As an alternative, use the Add/Remove Programs feature in the Windows Control Panel and select COMPASS for molbox. In both cases, a series of prompts must be followed in the application removal program to uninstall COMPASS.
  • Page 20  COMPASS for molbox™ User’s Manual Page 6 © 1998-2003 DH Instruments, Inc.
  • Page 21: Operating Principles

    User’s Manual OVERVIEW COMPASS for molbox is an application program intended to automate the test and calibration process to the extent supported by the available calibration hardware and appropriate for the DUT being tested. COMPASS supports automated operation of DHI molbloc/molbox transfer standards but can also be used with any type of flow measurement system from any manufacturer.
  • Page 22  COMPASS for molbox™ User’s Manual running a test for the first time. Subsequent tests will only require a selection of the desired DUT and Test Definitions. The [Run Test] section of this manual has a more detailed explanation of the requirements to run a test in COMPASS (see Section 7.2). Several COMPASS examples and frequently asked questions are in the Quick Tips section of this manual (see Sections 4, 5).
  • Page 23: Quick Tips

     COMPASS for molbox™ User’s Manual HOW DO I? Set up and run a test? Create a Test Definition to define the test procedure (see Section 9). Create a DUT Definition to define a device under test (see Section 8). Configure the test hardware to be used to run the test (see Section 10).
  • Page 24  COMPASS for molbox™ User’s Manual Set up COMPASS for my volume or actual flow units? From the [Setup], [DUT], [Range] tab, select the <Unit> drop down under the “Flow Range” section of the window. Scroll through this list to find the units you desire. If they do not exist they can be added using the <Edit Units>...
  • Page 25  COMPASS for molbox™ User’s Manual Add or remove a test point while editing a test definition? In the Test Definition <Points> Table, double clicking any test point automatically removes it from the test point list. All subsequent test points are shifted up. To add a test point press the <Insert>...
  • Page 26  COMPASS for molbox™ User’s Manual Customize the test report created by COMPASS to my own requirements? Modify the report template to reflect your requirements (see Section 16.3.1.3). It is best to select an existing template, then use the <Save As> option to create a copy of the template under a different name.
  • Page 27: Application Examples

     COMPASS for molbox™ User’s Manual OVERVIEW This section contains several generic application examples that cover many common COMPASS setups. Using these examples and the How Do I? tips in Section 4.1 will greatly simplify the learning process to get a test started. Although each example may not include explicit instructions on all test steps, there are three required steps that must always be followed before a test can be run: Create (or select) a DUT Definition.
  • Page 28: Set Up An Rs-232 Dut

     COMPASS for molbox™ User’s Manual 5.1.1.1 SET UP AN RS-232 DUT Use [Setup], [DUT] to create a new DUT Definition (see Section 8). If a DUT with similar characteristics already exists, it is easier to copy and edit the existing DUT than to start from scratch.
  • Page 29: Set Up A Molbox As The Reference

     COMPASS for molbox™ User’s Manual Figure 2. Example 1, DUT Read Command Setup Setting up the <Set Point Type> is similar to setting up the DUT <Output Type>. On the [Set] tab, first select RS-232 as the <Set Point Type>, then enter the RS-232 settings for the DUT: 9600,E,7,1.
  • Page 30: Run The Test

     COMPASS for molbox™ User’s Manual Figure 3. Example 1, molbox1 Reference Setup Now that the molbox is set up, it must be selected in the System Configuration. Select [Setup], [System] from the main menu (see Section 10.2). This form is the only place the hardware to be used by COMPASS is specified.
  • Page 31: Figure 5. Example 1, Dut Interface Setup

     COMPASS for molbox™ User’s Manual Next, the <Setup DUT> screen displays for the final setup of the DUT serial number, identification (for DUT Profiles only) and RS-232 settings. Enter the DUT serial number and identification if desired then click the <Read Interface> RS-232 settings display to display the RS-232 setup window.
  • Page 32: Example #2

     COMPASS for molbox™ User’s Manual 5.1.2 EXAMPLE #2 Assuming the molbox1 from Example 1 is set up and it has the MFC control option, “How do I calibrate a DUT that outputs 0 to 5 V corresponding to 0 to 1 slm?” This example demonstrates the setup requirements of a common analog output DUT.
  • Page 33: Example #3

     COMPASS for molbox™ User’s Manual 5.1.3 EXAMPLE #3 “How do I use my HP34401A DMM to measure the DUT output?” The HP34401A is a popular high accuracy Hewlett Packard multimeter that has an IEEE-488 and RS-232 interface. To read a voltage from this DMM, the command “MEAS:VOLT:DC?” must be issued.
  • Page 34: Run The Test

     COMPASS for molbox™ User’s Manual 5.1.3.3 RUN THE TEST Now that the COMPASS System Configuration includes the hardware necessary to run the test, use [Run], [Run Test] to start a test sequence (see Section 7.2). There is no interface selection required when setting up the DUT interface at the end of the test initialization.
  • Page 35: Test Definition Setup

     COMPASS for molbox™ User’s Manual Select the [Setup], [DUT], [Test] tab, and select the “Calibration Gas” that you will be using to calibrate the rotameter (see Section 8.5.6). Select the [Setup], [DUT, [Read] tab, and select “Manual” for the DUT Output Type (see Section 8.5.8).
  • Page 36: Run The Test

     COMPASS for molbox™ User’s Manual 5.1.4.4 RUN THE TEST Now that the COMPASS System Configuration includes the hardware necessary to run the test, use [Run], [Run Test] to start a test sequence. COMPASS calculates two (2) flow data fields that are associated with the rotameter test. The field that contains the flow that is generated using the measured gas pressure and temperature and the Square Root Density Correction is called “Ref Q DUT Cond”.
  • Page 37: Test Definition Setup

     COMPASS for molbox™ User’s Manual Figure 10. Example 5, DUT Definition Select the [Setup], [DUT], [Test] tab, and select the “Calibration Gas” that you will be using to test the DUT (see Section 8.5.6). Select the [Setup], [DUT], [Read] tab, and select the DUT Data Output Type (see Section 8.5.8).
  • Page 38: Run The Test

     COMPASS for molbox™ User’s Manual Figure 11. Example 5, System Configuration 5.1.5.4 RUN THE TEST Use [Run], [Run Test] to start a test sequence (see Section 7.2). 5.1.6 EXAMPLE #6 “How do I set up to test at a single flow point for an extended period of time?” You may desire to use COMPASS and the molbox/molbloc to capture mass flow data at one flow point over an extended period of time.
  • Page 39: Run The Test

     COMPASS for molbox™ User’s Manual 5.1.6.3 RUN THE TEST Use [Run], [Run Test] to start the test sequence (see Section 7.2). 5.1.6.4 PLOT THE DATA Once the test is complete, you can use the Plot options to product a plot of either Reference flow or DUT output versus point number (see Section 12.4).
  • Page 40: Run The Test

     COMPASS for molbox™ User’s Manual 5.1.7.3 RUN THE TEST Use [Run], [Run Test] to start the test sequence. If you are using manual flow control, COMPASS will prompt you to adjust the gas flow for the given test point. Flow will be set automatically if your test is using the <Other Controller>...
  • Page 41: Test Definition Setup

     COMPASS for molbox™ User’s Manual these are the temperature and absolute pressure of the gas that will flow through the DUT when it is used in the field (this is NOT measured the gas temperature and pressure during the calibration). If you know the normal operating conditions that were used for the DUT’s previous calibration, these conditions should be entered for this calibration to be compared to the previous calibration.
  • Page 42: Run The Test

     COMPASS for molbox™ User’s Manual “Ref Q” in the data grid is the reference flow expressed in the DUT flow units without any Gas Density Correction applied. This is the true value of the flow that is currently going through the DUT. This value is interesting because it shows the magnitude of the correction being applied due to the difference between current gas pressure and temperature conditions and the DUT’s normal operating conditions.
  • Page 43: Main Screen

     COMPASS for molbox™ User’s Manual OVERVIEW The main screen contains the interface between the program setup and all of the data acquisition run screens. When COMPASS is first started up, the main screen displays without any child windows. Only after a menu option is selected does the screen update to display the corresponding window.
  • Page 44: Run Modes

     COMPASS for molbox™ User’s Manual The Status Bar is located at the bottom of the main screen. In all run modes, COMPASS flashes information related to the current operation on this display. While running tests, two panels and a progress indicator also display with status information on the current test step and point.
  • Page 45: Run Toolbar

     COMPASS for molbox™ User’s Manual RUN TOOLBAR This toolbar is only active after one of the [Run] menu choices has been made. Depending on the type of run mode, some of the toolbar options may be disabled. Unlike the control toolbar, the run toolbar always displays at the top of the screen regardless of the current run state.
  • Page 46: Display Tools

     COMPASS for molbox™ User’s Manual 6.5.2 DISPLAY TOOLS Table 3 describes toolbar features that relate to COMPASS run screens. With the exception of the <Spy> window feature, all of the items listed in this table are also available using the [Display] menu (see Section 11.9).
  • Page 47: Control Toolbar

     COMPASS for molbox™ User’s Manual CONTROL TOOLBAR This toolbar appears on the left of the main screen in [Run molbox] and [Run DUT] run modes. Since Test Definitions control many of the control toolbar functions, the toolbar is not available in [Run Test] mode.
  • Page 48: Change/Reload Molbloc

     COMPASS for molbox™ User’s Manual 6.6.1 CHANGE/RELOAD molbloc This feature is represented by the toolbar icon: When using molbox1 as a reference, this tool displays a pop-up panel allowing a new molbloc channel to be selected: A, B or A+B. If the selected channel does not contain a valid molbloc, an error message displays and the molbox flow displays <Error>...
  • Page 49: Purge Function

     COMPASS for molbox™ User’s Manual Table 4. <Tare molbox> Panel Fields LABEL DESCRIPTION Red/Green This indicator is green only when the pressure rate of change is within the Circular Ready molbox’s internal tare rate criterion. In this state, the <Tare> button is enabled. Indicator When the indicator is red, the <Tare>...
  • Page 50: Modify Molbox Valve Drivers

     COMPASS for molbox™ User’s Manual 6.6.5 MODIFY molbox VALVE DRIVERS This feature is represented by the toolbar icon: The state of the optional external molbox valve drivers can be adjusted by using this toolbar function. molbox valve drivers are commonly used to activate valves that isolate or exposes devices to the system flow.
  • Page 51: Units Selection

     COMPASS for molbox™ User’s Manual Table 5. <Flow Conditions> Panel Fields FEATURE DESCRIPTION Calibration Gas Select the calibration gas from the list of molbox supported gases. (drop down list) Stability Setting molbox stability criterion. The value entered is in the current molbox flow display units when in [Run molbox] mode and the DUT flow units when in (numeric entry field) [Run DUT] mode.
  • Page 52: Flow Control

     COMPASS for molbox™ User’s Manual 6.6.8 FLOW CONTROL The flow control function is represented by the toolbar icon: If a non-manual flow control option is specified in [Run DUT] mode or the reference molbox has the MFC control option in [Run molbox] mode, this function is enabled to control the flow or molbox output.
  • Page 53: Enter Flow Data

     COMPASS for molbox™ User’s Manual Table 7. <Flow Control> Panel Fields FEATURE DESCRIPTION Target Flow The set point to activate using the currently configured flow control mechanism. This can be the DUT or a flow controller. The target flow value entered is (conditional numeric assumed to be in the units specified in the drop down list box next to the entry field)
  • Page 54: Table 8. Data Acquisition Options

     COMPASS for molbox™ User’s Manual When a data file is created in [Run DUT] and [Run molbox] run modes, data points can be taken without the constraints of a test. The resultant data file is identical to files generated with the [Run Test] option.
  • Page 55: Figure 20.

     COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION Logs an instantaneous data point at fixed time intervals. When the icon is pressed, Log 1 point at an input box displays to allow entry of the time interval. Then COMPASS will fixed intervals automatically log a data point and repeatedly log data points until the <Abort Data Acquisition>...
  • Page 56: Run Screens

     COMPASS for molbox™ User’s Manual RUN SCREENS COMPASS uses six different run screens and spy windows to display output information while in a run mode. The [Display] menu and the <Control Toolbar> can be used to activate any of these run screens while in a run mode (see Sections 11.9, 6.6).
  • Page 57: Molbox Output Run Screen

     COMPASS for molbox™ User’s Manual Table 9. <DUT/Reference Comparison> Run Screen Fields LABEL DESCRIPTION Red or Green molbox flow Ready/Not Ready indicator (see the molbox Operation and Maintenance Circular Indicator Manual, Ready/Not Ready Section). The circle is green when molbox flow is ready and red when not ready.
  • Page 58: Table 10. Run Screen Fields

     COMPASS for molbox™ User’s Manual Figure 22. <molbox Output> Run Screen Table 10. <molbox Output> Run Screen Fields LABEL DESCRIPTION Red/Green Circle Molbox flow Ready/Not Ready indicator (see the molbox Operation and Maintenance Manual, Ready/Not Ready Section). The circle is green when molbox flow is ready and red when not ready.
  • Page 59: Dut Output Run Screen

     COMPASS for molbox™ User’s Manual LABEL DESCRIPTION Active molbox calibration gas. In [Run molbox] mode, this value can be changed using the flow conditions toolbar icon (see Section 6.6.5). In all other run modes, the active DUT determines the calibration gas. In this case, the value cannot be changed. Stability Setting Active Ready/Not Ready stability criterion in the molbox.
  • Page 60: Average Data Run Screen

     COMPASS for molbox™ User’s Manual LABEL DESCRIPTION Set Point Nominal DUT set point. When an asterisk appears next to the value, automatic flow regulation is active (see Section 8.5.6). Measured Set Point Measured DUT set point for DUTs that control flow with a voltage (V) or current (mA) based set point unit.
  • Page 61: Data Grid Run Screen

     COMPASS for molbox™ User’s Manual Table 12. <Average Flow Data> Run Screen Fields LABEL DESCRIPTION Red/Green Circular molbox flow Ready/Not Ready indicator (see the molbox Operation and Maintenance Display Manual, Ready/Not Ready Section). The circle is red when any molbox flow reading during the averaging cycle was not ready and green when all molbox flow readings were ready.
  • Page 62: Data Plot Run Screen

     COMPASS for molbox™ User’s Manual See Table 63 in Section 18.4.1 for an exhaustive list and description of all data available for display in the <Data Grid> run screen. Figure 25. <Data Grid> Run Screen 6.7.6 DATA PLOT RUN SCREEN When running a test, the <Data Plot>...
  • Page 63: Table 13. Information

     COMPASS for molbox™ User’s Manual Spy windows are provided by COMPASS to troubleshoot or analyze remote communications. The caption of the spy window contains the instrument name and interface being spied on. Use the information in the <Command>, <Raw Response>, and <COMPASS Uses> fields to determine if COMPASS is properly configured for the remote device.
  • Page 64  COMPASS for molbox™ User’s Manual Page 50 © 1998-2003 DH Instruments, Inc.
  • Page 65: Run] Modes

     COMPASS for molbox™ User’s Manual OVERVIEW COMPASS has four basic run modes: <Idle>, [Run Test], [Run molbox] and [Run DUT]. Other than <Idle>, which indicates that COMPASS is in a state in which configuration changes can be made, each of these run modes is found in the [Run] menu on the main program.
  • Page 66: Initialize Molbloc/Molbox

     COMPASS for molbox™ User’s Manual Select Test (see Section 7.2.1.4): The test selection tool is presented identifying the Test Definition associated with the DUT selected in Step . A different Test Definition can be selected or viewed at this point. If this step is turned OFF, the screen is not shown and the Test Definition associated with the DUT is automatically selected.
  • Page 67: Select Dut

     COMPASS for molbox™ User’s Manual Figure 28. <Select molbloc> Panel 7.2.1.3 SELECT DUT The DUT Definition selection tool is presented allowing browsing of DUT Definitions available and selection of the DUT to run (see Section 8). If this step is turned OFF (see Section 11.2), the screen is not shown and the last DUT Definition used or accessed is automatically selected.
  • Page 68: Select Test

     COMPASS for molbox™ User’s Manual Figure 30. <DUT Selector> In DUT Definition Editor 7.2.1.4 SELECT TEST The Test Definition selection tool is presented identifying the Test Definition associated with the current DUT Definition (see Sections 8.5.6, 8.5.9). If the DUT Definition does not specify a test, the last test accessed is selected by default.
  • Page 69: Setup Dut Id/Interface

     COMPASS for molbox™ User’s Manual When <View Test> is pressed, the Test Definition Editor displays loaded with the currently selected Definition. The test cannot be modified using this pop-up, but all the characteristics can be viewed by clicking on the appropriate tabs. Use the Test Definition selection tools in the Test Definition Editor to view other tests.
  • Page 70: Figure 33. Panel

     COMPASS for molbox™ User’s Manual • If the DUT Definition is a DUT Profile, the screen sets up with blank information in the serial number and identification fields. At least one of these fields must be completed prior to closing the window. This window displays regardless of the state of the setup DUT option in [Tools], [Options], [Initialize Test], <Select DUT>...
  • Page 71: User Id

     COMPASS for molbox™ User’s Manual 7.2.1.6 USER ID The user ID entry screen is presented. The last user ID can be accepted, a new user ID may be entered, or a previously entered user ID may be selected from the user ID drop down list.
  • Page 72  COMPASS for molbox™ User’s Manual Set flow point: The flow test point is set. The method used to set the flow is determined by the <Flow Control> selection in the Test Definition (see Section 9.5.6). If flow setting is manual, the user is prompted to set the flow to the flow point value. If flow setting is automated, flow is set automatically using either the DUT or the selected flow controller.
  • Page 73: Manual Entry Data Acquisition

     COMPASS for molbox™ User’s Manual 7.2.2.1 MANUAL ENTRY DATA ACQUISITION When the reference or any portion of the required DUT data requires manual entry, the <Manual Entry> window displays to allow the necessary data entry. A unit of measure appears next to each entry field. It is critical that all entries be made in the specified unit of measure.
  • Page 74: Run Molbox]

     COMPASS for molbox™ User’s Manual Table 14. <Test Complete> Panel Options FEATURE DESCRIPTION <Rename> Used to override the default name and directory for the Data File resulting from the test. Brings up a standard Windows Save As file box showing the default directory (action button) and file name.
  • Page 75: Run Dut]

     COMPASS for molbox™ User’s Manual same fashion as a test if any of the <Control Toolbar> data acquisition options are used. When a point is taken all averaging and manual entry options follow the same rules as when a test is executed. If support instrument data is not necessary, simply uncheck all options and press [OK] to close the display and complete the initialization.
  • Page 76  COMPASS for molbox™ User’s Manual deactivated at this time. DUT’s that are setup to use a density correction or DUTs with actual flow units must use pressure and temperature data acquisition. The Run DUT option is similar to running a test without a fixed sequence. All operations available in the test are available on the <Control Toolbar>.
  • Page 77: Setup], [Dut]

     COMPASS for molbox™ User’s Manual OVERVIEW COMPASS is organized around the support and testing of Devices Under Test (DUTs). DUTs are defined in DUT Definitions. The information contained in the DUT Definition determines which System Configuration devices are required (see Section 10.2) for the COMPASS run modes. DUT Definitions not only specify the relationship between set point, output and flow;...
  • Page 78: Creating Dut Definitions

     COMPASS for molbox™ User’s Manual CREATING DUT DEFINITIONS Open the DUT Definition Editor using the [Setup], [DUT] menu option. Use the <New> DUT toolbar icon to create a new DUT Definition. Set up the DUT as desired then press the <Save> icon to store the DUT information.
  • Page 79: Dut Definition Editor

     COMPASS for molbox™ User’s Manual Figure 37. <DUT Selection> Tool DUT DEFINITION EDITOR All DUT Definitions are created or edited using the DUT Definition Editor. The Editor also acts as a viewer in other COMPASS functions. When editing a DUT, verify that each Editor tab contains the proper information.
  • Page 80: Toolbar

     COMPASS for molbox™ User’s Manual 8.5.1 TOOLBAR All fields above the tabs on the DUT Definition Editor are considered part of the toolbar. The toolbar not only identifies which Definition is active, but also provides tools to create, delete, save, restore, identify and select DUT Definitions. Table 15 identifies the toolbar features and their functions.
  • Page 81: Header] Tab

     COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION Delete Deletes the current DUT Definition. A message prompt for confirmation displays prior to removing the DUT Definition record. (toolbar button) Open/Select Displays the DUT Selector loaded with a sorted list of the DUTs (see Section 8.4). The selected DUT will display in the DUT Definition Editor.
  • Page 82: Table 16. Dut Definition Editor, [Header] Tab Fields

     COMPASS for molbox™ User’s Manual Table 16. DUT Definition Editor, [Header] Tab Fields FEATURE DESCRIPTION Record Type There are two types of DUT Definitions: • Individual DUT Definitions are intended to define a specific, individual DUT. They (required drop include a unique DUT serial number and identification value.
  • Page 83: Correction] Tab

     COMPASS for molbox™ User’s Manual 8.5.3 [CORRECTION] TAB The [Correction] DUT Definition tab is provided to accommodate DUTs that are sensitive to gas density. COMPASS can perform a square root or proportional gas density correction based on the characteristics of the flowing gas, the DUT’s normal operating pressure and temperature and the current gas pressure and temperature.
  • Page 84: Table 17. Dut Definition Editor, [Correction] Tab Fields

     COMPASS for molbox™ User’s Manual Figure 40. DUT Definition Editor, [Correction] Tab Table 17. DUT Definition Editor, [Correction] Tab Fields FEATURE DESCRIPTION Gas Density Determines which type of density correction will be used when the DUT is run. The density Correction Type correction selected is applied to the reference flow to correct the reference flow to the DUT’s normal operating conditions.
  • Page 85: Range] Tab

     COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION Process Gas and The currently selected <Process Gas> is the process gas specified in the <Header> tab Gas Constant (see Section 8.5.2) and cannot be changed here. The gas constant in this panel must correspond to the process gas.
  • Page 86: Table 18. Dut Definition Editor, [Range] Tab Fields

     COMPASS for molbox™ User’s Manual Table 18. DUT Definition Editor, [Range] Tab Fields FEATURE DESCRIPTION Flow Range Unit Select the DUT flow unit of measure from the drop down list. The final calculated DUT flow always displays in this unit. The minimum and maximum flow must be entered in the (required drop selected unit.
  • Page 87: Tolerance] Tab

     COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION Set Range Select the DUT set point unit from the drop down list. If the unit is not in the list, type the unit into the list box. If the set range unit is the flow range unit, the min/max set point Set Units fields are automatically set to the min/max flow range values.
  • Page 88: Test] Tab

     COMPASS for molbox™ User’s Manual Table 19. DUT Definition Editor, [Tolerance] Tab Fields FEATURE DESCRIPTION Tolerance Type Selects the DUT tolerance formula used to calculate DUT error at test points. Choices are: (required drop • down list %DUTFS: DUT tolerance is calculated as the flow span of the DUT times the selection) tolerance value.
  • Page 89: Conditions] Tab

     COMPASS for molbox™ User’s Manual Table 20. DUT Definition Editor, [Test] Tab Fields FEATURE DESCRIPTION Calibration Gas This is the gas that is actually flowed through the reference and the DUT when the DUT is tested. The value entered is used to determine the default <K Factor> (see (required drop immediately below).
  • Page 90: Read] Tab

     COMPASS for molbox™ User’s Manual Table 21. DUT Definition Editor, [Conditions] Tab Fields FEATURE DESCRIPTION Attitude Defines the orientation of the DUT during a test. This is recorded as descriptive text in the Data File and can be used in reports. The attitude is selected by using the attitude scroll bar. (scroll bar) The DUT icon to the right of the fields moves to illustrate the current attitude selection.
  • Page 91: Table 22. Dut Definition Editor, [Read] Tab Fields

     COMPASS for molbox™ User’s Manual Table 22. DUT Definition Editor, [Read] Tab Fields FEATURE DESCRIPTION Output Type Specifies what form of data will be acquired from the DUT. The available selections are: • Voltage/Current: The DUT outputs an electrical signal that will be acquired by the (required drop <DUT Output DMM>...
  • Page 92: Set] Tab

     COMPASS for molbox™ User’s Manual 8.5.9 [SET] TAB The DUT Definition [Set] tab defines how COMPASS is to set flow when running test on DUTs that are set up as flow controllers in the DUT Definition [Range] tab (see Section 8.5.4). If the DUT is NOT set up as a flow controller, the [Set] tab is not active.
  • Page 93: Table 23. Dut Definition Editor, [Set] Tab Fields

     COMPASS for molbox™ User’s Manual Table 23. DUT Definition Editor, [Set] Tab Fields FEATURE DESCRIPTION Set Point Type Specifies the manner in which set point commands are given for DUTs that can control flow. If the DUT is NOT set up as a controller in the DUT Definition [Range] tab (see Section 8.5.4), this field (conditional drop is disabled and the flow control method will be determined by the Test Definition or a [Run DUT] down list...
  • Page 94  COMPASS for molbox™ User’s Manual Page 80 © 1998-2003 DH Instruments, Inc.
  • Page 95: Setup], [Test]

     COMPASS for molbox™ User’s Manual OVERVIEW Test Definitions are used to define a specific test procedure including a sequence of flow points and a large number of operational details. In COMPASS [Run Test] mode, a DUT to be tested is selected an then the Test Definition to be executed is specified.
  • Page 96: Editing Test Definitions

     COMPASS for molbox™ User’s Manual EDITING TEST DEFINITIONS Tests can be edited whenever COMPASS is not in an active run mode. Use the [Setup], [Test] menu option to display the Test Definition Editor if not already open. Simply changing information in the Test Definition Editor places the Editor in the edit mode.
  • Page 97: Toolbar

     COMPASS for molbox™ User’s Manual • [Data] Tab (see Section 9.5.9): Defines what data is collected during tests. 9.5.1 TOOLBAR All fields above the display tab on the Test Definition Editor are considered part of the toolbar. The toolbar not only identifies which test is active, but also provides tools to create, delete, save, restore, identify and select tests.
  • Page 98: Points> Table

     COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION Restore Restores the Test Definition to the last saved state. Use this feature to abandon edits made to a Test Definition before saving. If a new test was created using the <New> option, the restore button is nonfunctional.
  • Page 99  COMPASS for molbox™ User’s Manual Point Type Indicates how the flow point values in the <Points> table will be interpreted when the test Indication is run. The choices are: <%DUTFS>, <Flow Units>, <Output Units> or <Set Units>. If the indication is <%DUTFS>, when the test is run, the flow points will be calculated from (label) the DUT input span defined in DUT Definition [Range] tab (see Section 9.5.4).
  • Page 100: Points] Tab

     COMPASS for molbox™ User’s Manual 9.5.3 [POINTS] TAB The Test Definition [Points] tab is used to set the <Test Point Type> and provides a short cut to fill in the <Points> table automatically, if desired (see Section 9.5.2). The purpose of the [Auto Fill Points] tab’s fields and settings as well as instructions on how to use them are provided in Table 26.
  • Page 101: Table 26. Test Definition Editor, [Points] Tab Fields

     COMPASS for molbox™ User’s Manual Table 26. Test Definition Editor, [Points] Tab Fields FEATURE DESCRIPTION Test Point Type Determines how the flow point values in the <Points> table will be interpreted when the test is run. Use the drop down list to select the type. The choices are: (drop down list) <%DUTFS>, <Flow Units>, <Output Units>...
  • Page 102: Sequence] Tab

     COMPASS for molbox™ User’s Manual 9.5.4 [SEQUENCE] TAB The Test Definition [Sequence] tab is used to specify details of how the test points of a test will execute (see Section 7.1). This includes defining dwell and data reading parameters as well as the number of times to run the test (number of cycles).
  • Page 103: Tare] Tab

     COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION Tare molbox Use the drop down list to select the flow points at which the molbox pressure transducers should be tared (see the molbox Operation and Maintenance (required drop Manual, [Tare] Section). The tare occurs after completion of the stability test. down list After taring, stability is rechecked before continuing with the next test step.
  • Page 104: Table 28. Test Definition Editor, [Tare] Tab Fields

     COMPASS for molbox™ User’s Manual Figure 51. Test Definition Editor, [Tare] Tab Table 28. Test Definition Editor, [Tare] Tab Fields FEATURE DESCRIPTION Wait for If checked, COMPASS waits for a user response before proceeding with the tare <Enter> to tare procedure.
  • Page 105: Control] Tab

     COMPASS for molbox™ User’s Manual 9.5.6 [CONTROL] TAB The Test Definition [Control] tab is used to specify how flow will be controlled to set the flow to the test point values as well as for purging. In the case of automated flow control, <Flow Regulation>...
  • Page 106: Table 29. Test Definition Editor, [Control] Tab Fields

     COMPASS for molbox™ User’s Manual Table 29. Test Definition Editor, [Control] Tab Fields FEATURE DESCRIPTION Flow Control Determines how flow will be controlled to set flow during tests. The choices are: • (drop down list) Manual: Flow will be set manually by the operator, not by a device that COMPASS can control remotely.
  • Page 107: Leak Test] Tab

     COMPASS for molbox™ User’s Manual 9.5.7 [LEAK TEST] TAB The Test Definition [Leak Test] tab is used to specify whether a leak test will be run at the beginning of the test (see Section 7.1) and/or after molbloc changes. The leak test used is the SYSTEM leak test function (see the molbox Operation and Maintenance manual, Leak Test Section).
  • Page 108: Data] Tab

     COMPASS for molbox™ User’s Manual Figure 54. Test Definition Editor, [Purge] Tab Table 31. Test Definition Editor, [Purge] Tab Fields FEATURE DESCRIPTION Automatic Check this box to include a purge routine at the beginning of a test. The flow system purge rate at which to purge and purge time are set in other fields of this tab.
  • Page 109: Table 32. Test Definition Editor, [Data] Tab Fields

     COMPASS for molbox™ User’s Manual Figure 55. Test Definition Editor, [Data] Tab Table 32. Test Definition Editor, [Data] Tab Fields FEATURE DESCRIPTION Read DUT When checked, the DUT output is read during the test and logged in the Data Output File.
  • Page 110: Auxiliary] Tab

     COMPASS for molbox™ User’s Manual 9.5.10 [AUXILIARY] TAB The Test Definition [Auxiliary] tab is really an extension of the [Data] tab. The options on the tab determines if Auxiliary data will be logged and which devices will be used. Edits to the list of Auxiliary devices will impact the list of devices saved in a Test Definition (see Section 10.3.7).
  • Page 111: Figure 57. Auxiliary Data Device Selector

     COMPASS for molbox™ User’s Manual Figure 57. Auxiliary Data Device Selector Page 97 © 1998-2003 DH Instruments, Inc.
  • Page 112  COMPASS for molbox™ User’s Manual Page 98 © 1998-2003 DH Instruments, Inc.
  • Page 113: Setup], [System]/ [Setup], [Hardware]

     COMPASS for molbox™ User’s Manual 10.1 OVERVIEW COMPASS’s System Configuration specifies the data acquisition and control hardware that COMPASS uses to accomplish specific data acquisition and control tasks. The System Configuration is created using [Setup], [System] to select Hardware Definitions for each specific task. Hardware Definitions are created using [Setup], [Hardware].
  • Page 114: Setup], [System]

     COMPASS for molbox™ User’s Manual 10.2 [SETUP], [SYSTEM] [Setup], [System] is a pop-up window used to select the Hardware Definitions to include in the System Configuration that COMPASS uses when in a run mode. The window is organized by the specific data acquisition and control functions that COMPASS may use in its various run modes.
  • Page 115: Table 34. Screen Fields

     COMPASS for molbox™ User’s Manual Table 34. <System Configuration> Screen Fields FEATURE DESCRIPTION Flow This is the source of reference flow values in the COMPASS run modes. The drop down list choices are created using the Hardware Definition [Reference] tab (see Section 10.3.3). This is a Reference required selection as all run modes include measurement of reference flow.
  • Page 116: Setup], [Hardware]

     COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION Temperature This is the device used to automatically read the temperature of the gas at the DUT for DUTs Measurement that specify a <Gas Density Correction Type> in the DUT Definition [Correction] tab (see Section 8.5.3) or when a Test definition has the DUT temperature option checked on the (drop down list [Data] tab (see Section 9.5.9).
  • Page 117: Toolbar

     COMPASS for molbox™ User’s Manual • [DMM] (see Section 10.3.4): Defines and stores digital multimeters (DMMs). These are the devices that are available in the System Configuration <DUT Output DMM> and <Setpoint DMM> drop down lists and can be used by COMPASS to read <Voltage/Current> output and set point type DUTs (see Sections 8.5.8, 8.5.9).
  • Page 118: Hardware Definition Editor

     COMPASS for molbox™ User’s Manual Table 35. Hardware Configuration, <Toolbar> Options FEATURE DESCRIPTION Creates a new Hardware Definition. Activates the Hardware Definition Editor with default information for the type of device selected (see Section 10.3.2). Copy Copies the contents of the current Hardware Definition to a new device then activates the Hardware Definition Editor (see Section 10.3.2).
  • Page 119: Figure 59. Hardware Definition, [Reference] Tab

     COMPASS for molbox™ User’s Manual The <Edit Reference Device> or <Add New Reference Device> pop-ups allow a flow reference Definition to be set up from scratch or edited from an existing one. Unlike other devices, the flow reference only requires a remote interface setup. If the reference is a molbox, all remote interactions are already supported by COMPASS.
  • Page 120: Table 36. Hardware Definition, Screen Fields

     COMPASS for molbox™ User’s Manual Table 36. Hardware Definition, <Edit Reference> Screen Fields FEATURE DESCRIPTION Manufacturer Defines the manufacturer of the reference device. If DH Instruments is selected, the <Model> listbox is populated with the supported molbox references. An <Other> choice is also available. Use this choice to set up reference devices other than DHI models.
  • Page 121: Dmm], [Frequency], [Pressure], [Temperature] Tabs

     COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION RS-232 If the <Remote Interface> selection is RS-232, the <RS232 Settings> panel Settings is shown. When creating a new device Definition, the settings are loaded with COMPASS default settings. Port settings are listed: baud rate, parity, data bits, (conditional stop bits.
  • Page 122: Figure 61. Hardware Definition, [Dmm] Tab

     COMPASS for molbox™ User’s Manual does not need to be set up under these tabs. In the System Configuration, when a molbox is selected as the <Flow Reference>, <Reference molbox> is automatically included as a choice in the <DUT Output DMM>, <Setpoint DMM> and <Setpoint Power Supply> fields (see Section 10.2).
  • Page 123: Table 37. , , , And Screen Fields

     COMPASS for molbox™ User’s Manual Table 37. <Edit DMM>, <Frequency>, <Pressure>, And <Temperature> Screen Fields FEATURE DESCRIPTION Manufacturer Labels the device manufacturer. Write in a manufacturer name. (required text entry field) Model Defines the device model. Write in a model name. (required text entry field) Serial Number...
  • Page 124  COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION Output Units For a DMM, indicates whether the <Read Commands> are for reading voltage (V) or current (A). DMMs save both voltage and current commands in a single (drop down DMM profile. selection list) For a frequency, pressure or temperature device, specifies the unit of measure in which the device output is returned.
  • Page 125: Power Supply] Tab

     COMPASS for molbox™ User’s Manual 10.3.5 [POWER SUPPLY] TAB The [Setup], [Hardware], [Power Supply] tab is used to manage the power supply Definitions that are included in the System Configuration <Set point power supply> drop down list (see Section 10.2). The [Power Supply] tab provides a list of the power supplies available, displays complete information on the selected power supply, allows the power supply to be edited or a new power supply to be created.
  • Page 126: Table 38. Hardware Definition, Screen Fields

     COMPASS for molbox™ User’s Manual Figure 64. Hardware Definition, <Edit Power Supply> Panel Table 38. Hardware Definition, <Edit Power Supply> Screen Fields FEATURE DESCRIPTION Manufacturer Labels the device manufacturer. Write in a manufacturer name. (required text entry field) Model Defines the device model.
  • Page 127  COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION Set Units Indicates whether the <Set Commands> are for setting voltage (V) or current (A). (drop down selection list) Separate <Set Commands> are set up for reading voltage (V) and current (A) in the same profile so that COMPASS can set in either mode as required by the current flow controlling device.
  • Page 128: Figure 65. Hardware Definition, [Controller] Tab

     COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION Communications This feature can be used only when the <Output Type> is RS-232 or IEEE-488. Test Press this button to send the set <Initialization Commands> and a single target flow. When the option is first selected, a dialog box prompts for the desired target flow. (action button) A <Spy Window>...
  • Page 129: Figure 66. Hardware Definition, Panel

     COMPASS for molbox™ User’s Manual Figure 66. Hardware Definition, <Edit Controller> Panel Page 115 © 1998-2003 DH Instruments, Inc.
  • Page 130: Table 39. Hardware Definition, Screen Fields

     COMPASS for molbox™ User’s Manual Table 39. Hardware Definition, <Edit Controller> Screen Fields FEATURE FIELD TYPE DESCRIPTION Manufacturer Required Text Entry Labels the device manufacturer. Write in a manufacturer name. Model Required Text Entry Defines the device model. Write in a model name. Serial Number Required Text Entry Defines the device serial number.
  • Page 131: Table 40. Hardware Definition, Screen Fields

     COMPASS for molbox™ User’s Manual Table 40. Hardware Definition, <Edit Controller> Screen Fields FEATURE FIELD TYPE DESCRIPTION K Factor to N2 Optional Numeric This is the flow controller’s gas conversion factor from the selected Entry <Calibration Gas> to N2. A new value can be entered for every <Calibration Gas>...
  • Page 132: Auxiliary]

     COMPASS for molbox™ User’s Manual 10.3.7 [AUXILIARY] The [Setup],[Hardware],[Auxiliary] tab is used to setup instruments to read and log data other than the data normally used by COMPASS. If a device has the capability to output information that you would like to include in the Data File but COMPASS would not normally acquire, <Auxiliary Data Devices>...
  • Page 133: Interface] Tab

     COMPASS for molbox™ User’s Manual Table 41. Auxiliary Definition, <Edit Controller> Screen Fields FEATURE DESCRIPTION Manufacturer See Section 10.3.4 for details on the other options on this dialog. (required text entry field) Response Enter a label in this field that describes the output provided by the auxiliary Label device.
  • Page 134: Figure 68. Hardware Definition, [Interface] Tab

     COMPASS for molbox™ User’s Manual Figure 68. Hardware Definition, [Interface] Tab Page 120 © 1998-2003 DH Instruments, Inc.
  • Page 135: Tools], [Options]

     COMPASS for molbox™ User’s Manual 11.1 OVERVIEW [Tools], [Options] is used to adjust a variety of COMPASS operational preferences. [Tools], [Options] is organized into six tab selected panels including: • [molbox] Tab (see Section 11.2): Enable or disable molbox specific features and specify default molbox display units of measure.
  • Page 136: Table 42. [Options], [Molbox] Tab Selections

     COMPASS for molbox™ User’s Manual Figure 69. [Options], [molbox] Tab Table 42. [Options], [molbox] Tab Selections FEATURE DESCRIPTION Allow selection Though any molbox supported gas can always be selected on the molbox, the of gases for molbloc may or may not have been calibrated with that gas. The molbox can which the determine whether the molbloc has been calibrated with a gas or not.
  • Page 137  COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION Test molbox A molbloc change inserted into a Test Definition can occur in one of 3 ways: change mode • prompt for change - A user prompt displays to change the mobloc. It is up to (drop down list the user to make all necessary electrical and pneumatic connections prior to box)
  • Page 138: Grid] Tab

     COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION Display mass COMPASS always calculates and displays the final molbox flow in the selected flow unit DUT Definition flow unit of measure in COMPASS run screens. However, the front panel of the molbox always displays in the fixed mass flow unit selected by this (drop down list option.
  • Page 139: Table 43. [Options], [Grid] Tab Selections

     COMPASS for molbox™ User’s Manual Table 43. [Options], [Grid] Tab Selections FEATURE DESCRIPTION Available Contains an alphabetically sorted list of the columns not currently included in the columns Data Grid run screen. Individual elements can be dragged and dropped onto the <Columns in grid>...
  • Page 140: Maintain Lists] Tab

     COMPASS for molbox™ User’s Manual 11.4 [MAINTAIN LISTS] TAB The [Tools], [Options], [Maintain Lists] tab is used to delete unwanted items from the various lists that COMPASS adds to automatically. To delete an item from a list, select the item from the drop down list and click the corresponding <Del>...
  • Page 141: Initialize Test] Tab

     COMPASS for molbox™ User’s Manual 11.5 [INITIALIZE TEST] TAB The [Tools], [Options], [Initialize Test] tab is used to set user preferences affecting the initialization portion of test execution (see Section ). The test initialization steps can be turned ON or OFF to 7.2.1.5 avoid repeating undesired or unnecessary steps each time a test is run.
  • Page 142: Run Test] Tab

     COMPASS for molbox™ User’s Manual 11.6 [RUN TEST] TAB The [Tools], [Options], [Run Test] tab is used to set user preferences affecting the run test part of test execution (see Section 7.2.2). Various aspects of run test behavior can be changed using this feature. The purpose of the [Run Test] tab fields and settings as well as instructions on how to use them are provided in Table 46.
  • Page 143  COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION Checking this option causes COMPASS to pause test execution and prompt for Prompt for manual valve manual valve operation when a zero flow set point is encountered in the test isolation for zero set sequence.
  • Page 144: End Test] Tab

     COMPASS for molbox™ User’s Manual Table 47. [Options], [Run Test] Tab, [Manual DUT P and T Entry Method] Fields FEATURE DESCRIPTION Determines when manual gas pressure and/or temperature entries will be Enter at made in the test sequence. There are three possible choices: (drop down list box) •...
  • Page 145: Table 48. [Options], [End Test] Tab Fields

     COMPASS for molbox™ User’s Manual Figure 74. [Options], [End Test] Tab!!! Table 48. [Options], [End Test] Tab Fields FEATURE DESCRIPTION COMPASS provides the capability to repeat test points using the <Back> Repeating final point of each <Run Toolbar> button (see Section 6.5.1). However, if a test ends cycle automatically after the last point, there is no opportunity to repeat points when...
  • Page 146: Data File] Tab

     COMPASS for molbox™ User’s Manual 11.8 [DATA FILE] TAB The [Tools], [Options], [Data File] tab is used to set user preferences affecting the Data File (*.dat) which records the data from a test run (see Section 18). The purpose of the [Data File] tab fields and settings as well as instructions on how to use them are provided in Table 49.
  • Page 147  COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION Data file delimiter This preference sets the data delimiter for the data in test Data Files (*.dat) (see Section 18.4). The choices are comma, tab or semicolon. (drop down semicolon delimiter is the default. The choice can be useful to assure list box) compatibility when COMPASS Data Files will be exported to another program.
  • Page 148: Display] Tab And [Display] Menu

     COMPASS for molbox™ User’s Manual 11.9 [DISPLAY] TAB AND [DISPLAY] MENU The [Tools], [Options], [Display] tab is used to set user preferences affecting the default COMPASS display for each run mode (see Section 6.7). Regardless of the default selections chosen, all available run screens can be repositioned and scaled as desired during any run mode.
  • Page 149: Table 50. [Options], [Display] Tab Fields

     COMPASS for molbox™ User’s Manual Table 50. [Options], [Display] Tab Fields FEATURE DESCRIPTION Run molbox Select the default [Run molbox] run mode display from the list. Realize that only the <molbox Output> and the <Averaging> run screens are available (drop down list box) for display in this run mode.
  • Page 150  COMPASS for molbox™ User’s Manual Page 136 © 1998-2003 DH Instruments, Inc.
  • Page 151: Data]

     COMPASS for molbox™ User’s Manual 12.1 OVERVIEW When COMPASS runs a test using [Run Test], it logs exhaustive information about the test in a Data File (*.dat). The Data File is automatically generated and stored to a DUT dependent directory. The [Data] menu accesses tools to work directly with COMPASS Data Files (*.dat).
  • Page 152: Data], [Print Test Data]

     COMPASS for molbox™ User’s Manual Figure 77. Data File Viewer 12.3 [Data], [Print Test Data] [Data], [Print Test Data] is used to print unformatted Data Files (see Section 16 to create reports from Data Files). When [Data], [Print Test Data] is selected, a standard Windows file browser appears set to the default Data File directory (see Section 18.3).
  • Page 153: Figure 78. [Data], [Plot Data File] Screen

     COMPASS for molbox™ User’s Manual Figure 78. [Data], [Plot Data File] Screen The name and directory path of the Data File currently being plotted is shown at the top of the plot screen. A plot toolbar is provided to select new Data Files, print the current plot, change the type of plot and access common plot properties.
  • Page 154: Table 51. Data Plot Types

     COMPASS for molbox™ User’s Manual 12.4.1 PLOT TYPES From the [Plots] button, eleven predefined plot types can be selected. Each new plot selection automatically generates the selected plot in accordance with the current <Plot Properties> (see Section 12.4.2). Depending on the selected properties, the plots may include tolerance bars or the results of a best fit straight line fit may be applied to the test data.
  • Page 155: Plot Properties

     COMPASS for molbox™ User’s Manual 12.4.2 PLOT PROPERTIES The plot toolbar plot properties icon, , activates the plot properties window. There are three tabs on the display window that can be used to customize the current plot. The elections made are saved and applied to all subsequent plots until a new selection is made.
  • Page 156: Subsets

     COMPASS for molbox™ User’s Manual FEATURES DESCRIPTION Include grid Activates and deactivates a grid overlay on the plot. (check box) 12.4.2.2 SUBSETS Data files created from multi-cycle tests allow discrete selection of the test cycles to plot. Any combination of cycles can be plotted at any given time. Check the cycle numbers that you wish to include in the current plot and uncheck those that you wish to remove from the plot.
  • Page 157: Custom Plot

     COMPASS for molbox™ User’s Manual Table 53. [Plot Properties], [Best Fit] Tab Fields FEATURES DESCRIPTION Include best fit Causes the best fit straight line of the plotted data to be data in single calculated and plotted in addition to the actual error plot. Applies cycle plots only to error type plots and does not apply when more than one test cycle is plotted.
  • Page 158: Table 54. [Plot Properties], [Custom Plot] Tab Fields

     COMPASS for molbox™ User’s Manual Table 54. [Plot Properties], [Custom Plot] Tab Fields FEATURES DESCRIPTION Plot Description Enter text that describes the data that will be plotted. The text entered will appear at the bottom of the list of selectable plots (text entry) and at the top of plots generated using this plot selection.
  • Page 159: Remote Interfacing

     COMPASS for molbox™ User’s Manual 13.1 OVERVIEW The ability to communicate quickly and simply with a wide variety of instruments is one of the most important features of COMPASS. Without this capability, the benefits of automation could not be fully realized as data acquisition and control functions would still have to be performed manually.
  • Page 160: Remote Command Editor

     COMPASS for molbox™ User’s Manual 13.2 REMOTE COMMAND EDITOR The remote command editor is used to define commands issued using an RS-232 or IEEE-488 interface. The editor changes display options based on the type of command being set up. Some commands require a response while others do not.
  • Page 161: Set Commands

     COMPASS for molbox™ User’s Manual See Section 13.2.4 for information on Command Editor features. Figure 84. <Read Commands Editor> Panel 13.2.3 SET COMMANDS Set commands are used to stimulate an output in the instrument being set up. For DUT’s and flow controllers, the set commands should generate a flow in the <Set Units>.
  • Page 162: Editor Features

     COMPASS for molbox™ User’s Manual Figure 85. <Set Commands Editor> Panel 13.2.4 EDITOR FEATURES All Command Editors have common features and some that are specific to certain types of Command Editors. 13.2.4.1 <LEADING CHARACTERS TO STRIP> <Leading characters to strip> applies only to <Read> and <Auxiliary Data> actual output commands.
  • Page 163: Insert Special Character

     COMPASS for molbox™ User’s Manual 13.2.4.2 <INSERT SPECIAL CHARACTER> Use the <Insert Special Character> button in the event a nonprintable ASCII character is a required part of the remote command. When activated the <ASCII Characters> window displays. Select <Hex> to select the character using the hexadecimal value or <Decimal>...
  • Page 164: Ieee-488 Interface

     COMPASS for molbox™ User’s Manual represent the physical connection of the device and an RS-232 port on the host computer or the currently configured reference device. Use the <Ref Com2> selection found at the end of the <COM Port> drop down list to access the currently configured reference COM2 port rather than a standard communications port on the host PC.
  • Page 165: Figure 88. Remote Communications Tool

     COMPASS for molbox™ User’s Manual commands to send prior to entering command information into any of the Command Editors. If a command issued to a device does not give the desired results, refer to the device documentation for information. [Tools], [Remote Communications] allows the desired interface type to be selected and interface parameters to be specified.
  • Page 166  COMPASS for molbox™ User’s Manual Page 152 © 1998-2003 DH Instruments, Inc.
  • Page 167: Tools], [Flow Unit Editor]

     COMPASS for molbox™ User’s Manual 14.1 OVERVIEW Flow unit of measure selection is used in COMPASS DUT Definitions (see Section 8). In all lists that allow the selection of a flow unit of measure, there is an <Edit Units> option at the top of the list. When <Edit Units>...
  • Page 168: Flow Unit Editor

     COMPASS for molbox™ User’s Manual 14.2 FLOW UNIT EDITOR The <Flow Unit Editor> is accessed by selecting <Edit Units> in a any flow unit of measure drop down list. When the <Flow Unit Editor> first displays it is in view mode. This means that any flow units can be viewed by selecting the unit from the <Flow Unit>...
  • Page 169: Table 55. Panel Fields

     COMPASS for molbox™ User’s Manual Table 55. <Flow Unit Editor> Panel Fields FEATURE DESCRIPTION Flow Unit When the editor is in view mode, the list of currently supported flow units is in the drop down list. The settings for each flow unit appear in the corresponding portions of the flow unit (drop down list editor.
  • Page 170: Unit Converter

     COMPASS for molbox™ User’s Manual 14.3 UNIT CONVERTER A general unit conversion tool is available in the [Tools], [Unit Converter] menu. This tool allows the conversion of pressure, temperature and flow from one unit to another. This tool is useful when defining ranges or when trying to analyze data in units not reported.
  • Page 171: Table 56. Panel Fields

     COMPASS for molbox™ User’s Manual Table 56. <Flow Unit Converter> Panel Fields FEATURE DESCRIPTION Current The numeric pressure value in the units that will be converted. Pressure (numeric entry field/drop down list box) Calculated The converted pressure value in the selected pressure units. Pressure (display field/ drop down list...
  • Page 172  COMPASS for molbox™ User’s Manual Page 158 © 1998-2003 DH Instruments, Inc.
  • Page 173: Tools], [Process Gas Editor]

     COMPASS for molbox™ User’s Manual 15.1 OVERVIEW The Process Gas Editor is a separate application included with COMPASS that is used to create and maintain information on the DUT manufacturer process gases available in the DUT Definition [Header] tab (see Section 8.5.2). The goal of the application is to allow users to add and maintain a list of DUT manufacturers with specific gas conversion factors (often called “K”...
  • Page 174: Features

     COMPASS for molbox™ User’s Manual Figure 91. <Process Gas Editor> Tool 15.2 FEATURES A description of the functional aspects of the Process Gas Editor is included in Table 57. Table 57. <Process Gas Editor> Tool Fields FEATURE DESCRIPTION Select the name of the DUT manufacturer whose list of process gases is being updated. Manufacturer This field can alo be used to create, rename or delete DUT manufacturers.
  • Page 175  COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION K Factor to N2 The gas conversion factor from the process gas to N2. (numeric entry field) K Factor to surrogate The gas conversion factor from the process gas to the selected surrogate gas. (numeric entry field) Surrogate name A full text name of the surrogate gas.
  • Page 176: Gas Blends

     COMPASS for molbox™ User’s Manual 15.3 GAS BLENDS Press <Create Gas Blend> in the Process Gas Editor (see Section 15) to define a blended gas. Use the drop down list box to select the first gas in the blend. Enter the percentage of the blended gas that the selected gas represents in the <Add Percentage>...
  • Page 177: Data], [Report Editor]

     COMPASS for molbox™ User’s Manual 16.1 OVERVIEW The purpose of the COMPASS Report Editor is to generate test reports from Data Files (*.dat), view the reports, edit and print them. The Report Editor is a separate application installed when COMPASS is installed. The COMPASS Report Editor can be accessed in three ways: using the [Data], [Report Editor] menu option;...
  • Page 178: File]

     COMPASS for molbox™ User’s Manual The main menu of the Report Editor is divided into several sections, each with a separate function. Many of these functions can also be accessed by a shortcut included on one of the COMPASS Report Editor toolbars.
  • Page 179: Fi L E ], [Ed I T Re P O R T ]

     COMPASS for molbox™ User’s Manual Detailed information on each of the items in the [File] menu is listed in this section. Items that have an equivalent toolbar shortcut, display the icon of the tool bar next to the section title. Multiple files can be selected using many of the [File] menu options.
  • Page 180: File], [Create Template]

     COMPASS for molbox™ User’s Manual change an existing template or to create a new template similar to an old template. For example, if an existing template contains a standard header, footer and formatting, it may be simpler to create a new template by editing an existing template and saving it to a new name rather than to start a new template from scratch.
  • Page 181: File], [Save]

     COMPASS for molbox™ User’s Manual [File], [Create Template] is provided to create a template from scratch. This is a more advanced report feature that should only be used after the report generation process is thoroughly understood. It is a much simpler task to edit an existing template and save that template with a different file name (see Section 16.3.1.3).
  • Page 182: File], [Print]

     COMPASS for molbox™ User’s Manual to save the file before closing. When several files are being closed, an extra option is provided to automatically save any changed files preventing the need to make a selection for each file. The prompt displays only after a changed file is encountered and more than one file is currently open.
  • Page 183: Edit], [Copy]

     COMPASS for molbox™ User’s Manual This information can be pasted into other applications or other locations within the COMPASS Report Editor. 16.3.2.3 [EDIT], [COPY] This feature is represented by the toolbar icon: [Copy] copies the current selection to the Windows clipboard without first deleting it.
  • Page 184: Edit], [Find Next]

     COMPASS for molbox™ User’s Manual Table 58. <Find> Panel Fields FEATURE DESCRIPTION Find What The text entered in this field is the search text. (required entry field) Match Case Select this feature when the search should match both case and text. (check box) Find Whole Word Only Causes search to ignore occurrences of the search text...
  • Page 185: Format], [Select Template]

     COMPASS for molbox™ User’s Manual To embed a link using the field insertion tool, place the cursor in the report template at the desired location of the link. Press [CTRL] + T to invoke the Data Field Insertion Tool. The tool appears over the top of the open report template. The Data File fields available are sorted into “field categories”.
  • Page 186: Format], [Multiple Cycles]

     COMPASS for molbox™ User’s Manual 16.3.3.4 [FORMAT], [MULTIPLE CYCLES] [Multiple Cycles] is used to determine how the report editor should handle Data Files that contain test data from multiple cycles (see Section 9.5.4). The options provide the ability to override the report template fields that identify data from a specific test cycle.
  • Page 187: Format]

     COMPASS for molbox™ User’s Manual 16.3.3.5 [FORMAT], [PAGE SETUP] [Page Setup] is provided to change the margins of the active document. By default, all page margins are 0.5 inches on new documents. Use the [↑] and [↓] arrow keys to modify the page margins. Each key press corresponds to a 0.1 inch margin increment in the direction of the arrow.
  • Page 188: Table 60. Compass Report Editor, Font Format Toolbar

     COMPASS for molbox™ User’s Manual move within the text of an open document refreshes this toolbar with the current text formatting at the cursor insertion point. Figure 99. COMPASS Report Editor, Font Format Bar Table 60. COMPASS Report Editor, Font Format Toolbar FEATURE DESCRIPTION Displays and changes the current font.
  • Page 189: Options], [Ruler]

     COMPASS for molbox™ User’s Manual 16.3.4.3 [OPTIONS], [RULER] The [Ruler] gives a visual indication, in inches, of the document layout. At all times the left most position of the ruler corresponds to the left margin setting of the document. Changes in the margin settings will not reflect on the ruler.
  • Page 190: Window]

     COMPASS for molbox™ User’s Manual Editor determines the default storage location for Data Files used by the Report Editor. There is also a Data File path selection in COMPASS on the [Tools], [Options], [Data File] tab (see Section 11.8). Normally, the Report Editor and COMPASS main program default Data File paths are set to the same location.
  • Page 191: Command Line Arguments

     COMPASS for molbox™ User’s Manual 16.4.2 COMMAND LINE ARGUMENTS COMPASS uses command line arguments and DDE (Dynamic Data Exchange) to generate reports in the Report Editor after the completion of a test. Running the Report Editor with a command line of Data File names separated by the pipe character “|” generates a separate report for each Data File using the current report template.
  • Page 192  COMPASS for molbox™ User’s Manual Page 178 © 1998-2003 DH Instruments, Inc.
  • Page 193: Help]

     COMPASS for molbox™ User’s Manual 17.1 OVERVIEW [Help] accesses COMPASS on line help. [Show Help] opens the Help function to the Welcome screen from which Help functions can be accessed. [Search Help] opens the Help function to a standard keyword search tool. What’s This? help is available on all displays that contain a question mark in the top right hand corner control box.
  • Page 194  COMPASS for molbox™ User’s Manual Page 180 © 1998-2003 DH Instruments, Inc.
  • Page 195: Data Files

     COMPASS for molbox™ User’s Manual 18.1 OVERVIEW Data files (*.dat) are the files created by COMPASS to store the data relating to a test run on a DUT using [Run Test] (see Section 7.2). Data files can be viewed, edited, printed and made into custom reports all within COMPASS.
  • Page 196: Data File Structure

     COMPASS for molbox™ User’s Manual 18.4 DATA FILE STRUCTURE The Data File structure includes headings and labels that make it easy to read and follow. The information in the Data File is divided into sections. Each section, with the exception of the first section, is preceded with a blank line followed by a single line describing the section.
  • Page 197: Data File Fields

     COMPASS for molbox™ User’s Manual SECTION DESCRIPTION Pressure Includes information on the pressure measuring device used to log gas pressure at the DUT during test execution (see Sections 10.2, 10.3.4). If pressure was not measured during the test, these fields are set to N/A. Temperature Includes information on the temperature measuring device used to log gas temperature at the DUT during test execution.
  • Page 198  COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION Status Character display representing the status of the point taken. Many combinations of these values may exist for any given point. The definitions of the characters are: • OK - Flow was stable and within tolerance (see Sections 8.5.5, 9.5.4). •...
  • Page 199  COMPASS for molbox™ User’s Manual FEATURE DESCRIPTION Measured DUT set point. This value is present only when a the Test Definition DUT Set [Data] tab specifies set point measurement (see Section 9.5.9). Gas pressure at the DUT in the DUT Definition’s normal operating pressure unit DUT P of measure (see Section 8.5.3).
  • Page 200  COMPASS for molbox™ User’s Manual Page 186 © 1998-2003 DH Instruments, Inc.
  • Page 201: Calculations

     COMPASS for molbox™ User’s Manual 19.1 OVERVIEW COMPASS operation includes many internal calculations. Most of these calculations are related to analyzing the data taken during a test run. The internal calculations performed by COMPASS are documented in the sections that follow. The calculations have been verified both by comparison of the program code content to the defined formulas and by parallel manual calculation.
  • Page 202: Dut Set Points

     COMPASS for molbox™ User’s Manual 19.3 DUT SET POINTS DUT set points are determined in almost the exact opposite manner as the DUT flow described in Section 19.2. The percentage of the DUT flow range relative to the span is used to determine the DUT output (see Sections 8.5.4, 8.5.8 for information on DUT output and flow spans).
  • Page 203: Density Corrections

     COMPASS for molbox™ User’s Manual %Reading errors are undefined near 0 (zero) reference flows. Set point errors are determined using the measured DUT set point whenever possible. If a measured value is not available, the nominal value is used as the set point. −...
  • Page 204  COMPASS for molbox™ User’s Manual made and their uncertainties may be poorly quantified, testing of density sensitive devices should always be made under conditions as close as possible to the DUT’s normal operating conditions. Although the density correction is specified by the DUT, the actual correction is applied to the reference flow to determine the reference flow in the DUT’s normal operating conditions, i.e., what the flow through the DUT would be if it were operating under its normal operating conditions, not the current operating conditions.
  • Page 205: Tolerance

     COMPASS for molbox™ User’s Manual 19.6 TOLERANCE The determination of whether a point is in or out of tolerance depends on the type of tolerance selected, and the DUT and reference flows. Tolerance values may be specified in multiple units (see Section 8.5.5).
  • Page 206: Best Fit

     COMPASS for molbox™ User’s Manual 19.7 BEST FIT All best fit values in COMPASS are determined using the least squares method. This defines a selectable order polynomial equation that defines a line (or curve) that minimizes the sum of the squares of the distances from the calculated line (or curve) to the actual line (or curve).
  • Page 207: Hysteresis

     COMPASS for molbox™ User’s Manual If the minimum and maximum reference flows in the test sequence are equal, linearity cannot be calculated and COMPASS displays <N/A> in place of a number. 19.9 HYSTERESIS COMPASS determines the hysteresis of DUT output relative to the reference readings. The hysteresis value is included in the <Calculations>...
  • Page 208: 19.12 Flow Unit Conversions

     COMPASS for molbox™ User’s Manual VARIABLE DESCRIPTION Calculated DUT measurement uncertainty expressed as a value in DUT flow units, using a coverage factor of 2. The value is reported as %DUTFS by dividing by the DUT’s span and multiplying by 100. Standard estimate of error for a first order linear regression.
  • Page 209  COMPASS for molbox™ User’s Manual Table 65 to Table 69 define the variables and conversion constants required to convert flow units. Use the conversion factors as necessary to begin with sccm, ccm, pccm, mol/s or kg/s. Then use the appropriate formula to convert to kg/s then from kg/s to sccm, ccm, pccm or mol/s.
  • Page 210: Table 64. Flow Unit Conversion Formulas

     COMPASS for molbox™ User’s Manual Table 64. Flow Unit Conversion Formulas DESCRIPTION EQUATION Determine gas density for any gas. ρ ρ Determine kg/s flow from sccm (or ccm) at a given pressure and sccm temperature. If sccm is used, P and T are defined by the flow unit. sccm @ 70F would use standard atmosphere (101.325 kPa) for P and 70F for T (see Section 14.1).
  • Page 211: Table 65. Definition Of Terms In Flow Unit Conversion Formulas

     COMPASS for molbox™ User’s Manual Table 65. Definition Of Terms In Flow Unit Conversion Formulas VARIABLE DESCRIPTION Molecular weight of the gas used. Ideal gas constant = 8314.411. Temperature of the gas or the reference temperature of the flow unit converted to degrees Kelvin.
  • Page 212: Table 67. Supported Gas Molecular Weights

     COMPASS for molbox™ User’s Manual Table 67. Supported Gas Molecular Weights MOLECULAR WEIGHT Air (Air) 28.959 Argon (Ar) 39.948 Butane (C 58.1245 Carbon Dioxide (CO 44.0100 Carbon Monoxide (CO) 28.0106 Carbon Tetrafluoride (CF 88.0048 Ethane (C 30.0702 Ethylene (C 28.054 Fluoroform (CHF 70.0144...
  • Page 213: Table 68. Conversions From Kg/S To Mole/S For Various Gases

     COMPASS for molbox™ User’s Manual Table 68. Conversions From kg/s To mole/s For Various Gases TO CONVERT kg/sec TO mole/s MULTIPLY BY Air (Air) 3.45316 E+01 Argon (Ar) 2.50325 E+01 Butane (C 1.72049 E+01 Carbon Dioxide (CO 2.27221 E+01 Carbon Monoxide (CO) 3.57015 E+01 Carbon Tetrafluoride (CF...
  • Page 214: 19.13 Pressure Unit Conversions

     COMPASS for molbox™ User’s Manual 19.13 PRESSURE UNIT CONVERSIONS COMPASS performs all internal pressure conversion to and from Pascal [Pa], the SI unit for pressure. Table 70 provides the conversion coefficients used by COMPASS and other DHI products to convert numerical values expressed in Pascal [Pa] units to corresponding values expressed in other units.
  • Page 215  COMPASS for molbox™ User’s Manual       62188   −     Variable Definition Calculated water ratio. Calculated water saturation pressure. Relative humidity. Ambient pressure in Pa. Ambient temperature in Kelvin. 0.0649289 -53.0528 14509.9 -1327760...
  • Page 216  COMPASS for molbox™ User’s Manual Page 202 © 1998-2003 DH Instruments, Inc.
  • Page 217: Troubleshooting

    20.1 OVERVIEW COMPASS for molbox is a sophisticated software package with many advanced features with the potential to be misused and/or misunderstood. Check the HOW DO I? section for an explanation on how to properly use COMPASS for several common applications as well as quick tips on how to use many features.
  • Page 218  COMPASS for molbox™ User’s Manual SYMPTOM PROBABLE CAUSE SOLUTION • When flow regulation Make sure the gas supply is The flow regulation time is too active, reference flow sufficient for the current test and small. oscillates significantly around that the flow controller has the •...
  • Page 219  COMPASS for molbox™ User’s Manual SYMPTOM PROBABLE CAUSE SOLUTION Data Files are not being Data Files are stored under the Data Familiarize yourself with the Data stored to the right directory. File name and the directory path File naming and storing protocol. specified.
  • Page 220  COMPASS for molbox™ User’s Manual Page 206 © 1998-2003 DH Instruments, Inc.
  • Page 221: Glossary

     COMPASS for molbox™ User’s Manual Absolute As in “absolute pressure”. Pressure expressed relative to vacuum. Actual Flow Units Units of measure of volume flow (sometimes called “volume flow”). Do not confuse volume flow units with volumetrically based mass flow units. See the molbox Operation and Maintenance Manual, [Unit] Section, for an extensive discussion of flow units of measure.
  • Page 222  COMPASS for molbox™ User’s Manual Adjust flow slightly at a flow point prior to taking DUT and reference readings at the point. Jog is most often used when testing visual output devices such as rotameters to set the flow so that the DUT indication is on the nominal flow point prior to taking data at the point.
  • Page 223  COMPASS for molbox™ User’s Manual Stability Limit A limit expressed in units of flow per second (e.g., sccm/second). The stability limit is used as the molbox Ready/Not Ready criterion Ready (<*>) if rate is less than stability limit, Not Ready (<↑> or <↓>) if rate is greater than stability limit. See also Rate. Surrogate Gas A gas whose behavior, from the standpoint of a device under test (DUT), is similar to the process gas for which the device is to be characterized and used.
  • Page 224  COMPASS for molbox™ User’s Manual Page 210 © 1998-2003 DH Instruments, Inc.
  • Page 225: End User License Agreement

    COMPASS for molbox™ User’s Manual COMPASS for molbox (COMPASS) is protected by copyright laws and international copyright treaties, as well as other intellectual property laws. COMPASS is licensed, not sold. You may install or use one copy of COMPASS on a single computer. The primary user of the computer on which COMPASS is installed may make a second copy for his or her use on a second computer used only for producing reports using the COMPASS Report Editor function.
  • Page 226  COMPASS for molbox™ User’s Manual Page 212 © 1998-2003 DH Instruments, Inc.

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