IOtech eZ-Analyst User Manual

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IOtech

www.iotech.com

Real-Time Vibration and

Acoustic Analysis Software

eZ-Analyst version 5.1.x

USER’S MANUAL

25971 Cannon Road

Cleveland, OH 44146-1833

*372165D-01*

372165D-01 1086-0922 rev 15.1

(440) 439-4091

Fax: (440) 439-4093

sales@iotech.com

productsupport@iotech.com

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Manual Layout

Check the README.TXT file, if present, for information that may not have been available at the time this manual went to press.

This document is a reference manual for eZ-Analyst, its Menu options, associated Toolbar buttons, and resulting GUI screen images. When deemed beneficial, examples were placed to supplement the primary material. The document discusses eZ-Analyst in relation to ZonicBook/618E, WaveBooks, and IOtech 640, 650, and 652 dynamic signal analyzers. Differences in functionality are pointed out when of importance to the user.

Ch 1 – Software Installation

Ch 2 – An Introduction to eZ-Analyst Discusses eZ-Analyst’s measurement and

playback modes.

Ch 3 – Menus discusses the following menus: Task, File, Control, Export, and Window.

The Edit Menu is discussed in chapter 4.

Ch 4 – Edit Menu discusses the following windows: Configuration, Playback Setup, Display

Preferences, and Output Channel Setup. Note that the 640e and 640u analyzers of a relatively extensive section pertaining to output waveforms.

Ch 5 – Toolbar Buttons identifies and shows the location of the toolbar buttons and

provides a brief synopsis of their purpose.

WaveBooks ZonicBook/618E IOtech 640, 650, and 652

Ch 6 – Interactive Features of the Plot Display Window explains how to change plot

display characteristics, including display functions, by using the window’s interactive

features. The chapter includes a section on cursor types and annotation options.

Ch 7 – Waterfalls, Order Tracking, & Slice Views discusses these display options

available to eZ-Analyst users.

Appendix A – Keyboard Controls for eZ-Analyst identifies keys for controlling plot

display, menus, windows, and record/playback functions.

Glossary

eZ-Analyst 938091 iii

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Table of Contents

Manual Layout …… iii

Ch 1 – Software Installation

WaveBooks …… 1-1 ZonicBook/618E …… 1-3 IOtech 640, 650, and 652 …… 1-5

Ch 2 – An Introduction to eZ-Analyst

Features …… 2-2 Measurement Mode …… 2-5 Playback Mode …… 2-5 A Word about Configuration …… 2-5

Ch 3 – Menus

Task Menu …… 3-2 File Menu …… 3-10 Control Menu …… 3-10 Export Menu …… 3-11 Window Menu …… 3-13

Edit Menu …… see chapter 4 Waterfalls, Order Tracking, & Slice Views …… see chapter 7

Ch 4 – Edit Menu

Configuration Window …… 4-1

Analyzer Tab …… 4-3 Input Channels Tab …… 4-15

Analog Input Channels …..4-16 Tach Channels ….. 4-20

FFT Setup Tab …… 4-25 Recording Setup Tab …… 4-33 Block Rejection Tab …… 4-37 Octave Setup Tab…… 4-39 Preferences Tab …… 4-41

Output Channel Setup …… 4-45

ZonicBook/618E and WaveBook Waveform Output …… 4-45 640u and 640e Waveform Output …… 4-47

Playback Setup Window …… 4-57 Display Preferences Window …… 4-58

Ch 5 – Toolbar Buttons

Continued . . .

eZ-Analyst 938091 v

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Ch 6 – Interactive Features of the Plot Display Window

Introduction …… 6-1 Adding and Removing Channels …… 6-1 Using Cursors …… 6-2 Additional Functionality …… 6-6

Copy …… 6-6 Strip Charts …… 6-7 XLS Overlay (Overlay of Excel Files) …… 6-8 Displaying Channel Pairs …… 6-10 Changing the Display Range …… 6-10 Changing Format, Scale, and Grid …… 6-12

Ch 7 – Waterfalls, Order Tracking, & Slice Views

3D Waterfalls …… 7-2 Order Tracking …… 7-7 Selecting Displays …… 7-8 Using Spectrum Cursors …… 7-11

Appendix A – Keyboard Controls for eZ-Analyst

Glossary

vi 938091 eZ-Analyst

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Software Installation 1

WaveBooks …… 1-1 ZonicBook/618E …… 1-3 IOtech 640, 650, 652, and 655 …… 1-5

WaveBooks

System Requirements

Certain WBK options are not supporte d by eZ-Analyst. If you are using WBK options with W a v eBook and intend to use eZ-Analyst, refer to the WBK support table on page 1-2.

Before setting up the hardware or in s talling the softwa r e , verify that you ha ve the following items.

• WaveBook data acquisition system

• Power supply with cord

• For WaveBook/516E: Ethernet patch c a ble

• Dynamic Signal Analysis CD

• License Key for eZ-Analyst

In addition, ver ify that your compu te r m ee ts the following m inimum requiremen ts .

• Monitor: SVGA, 1024 x 768 resolution

• For WaveBook/516E: 10/100BaseT Ethernet port

• Requires 32-bit version of Windows: Windows 2000 SP4, Windows XP, or Windows Vista (x86)

Windows 2000 SP4 and Windows X P Us ers

PC with Intel

Windows Vista (x86) users:

PC must be Windows Vis ta Premium Ready

™

Pentium 4 or equivalent; 1 GB memory; 10 GB disk space

• Optional, but recommende d:

EPP (Enhanced Parallel Port), or ECP (Extended Capabilities Port)

Software Inst a ll at ion for WaveBooks

Remove any previous-installed versions of WaveBook software before installing a new version.

1. Start Windows.

2. Close all running applic a tions.

3. Insert the Dynamic Signal Analysis CD into your CD-ROM driv e and wait for the CD to auto-run.

If the CD does not start on its own:

(a) click the desktop’s <Start> button (b) choose the Run command (c) select the CD-ROM drive, then select the setup.exe file (d) click <OK>

An Opening Screen will appear.

eZ-Analyst 988490 Software Installation, Wav eBooks 1-1

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4. Click the <ENTER SETUP> button.

5. From the hardware selection screen [which follows a licensing agreement], select

WaveBook Systems from the drop-down list an d follow the on-scr e en instructions.

WBK Support for WaveBooks using eZ-Analyst

WBK Option Supported

WBK10A – Analog E xpansion Module - no WBK11A – Simultaneous Sample & Hold (SSH) Card  WBK12A and WBK13A – Programma ble Filter Cards  WBK14 – Dynamic Signal Conditioning Module  WBK15 – 5B Isolated Signal Conditioning Module - no WBK16 – Strain Ga ge M od ule - no WBK17 – Counter-Input Module, with Qu a drature Encoder Support - no WBK18 – Dynamic Signal Conditioning Module  WBK20A – PCMCIA/EPP Interface Card and Cable  WBK21 – ISA/EPP Interface Plug-In Board  WBK23 – PCI/EPP Interface Plug-In Board  WBK25 – Ethernet Interface Module  WBK30 – WaveBook Memory Options  WBK40 and WBK41 – Thermocouple and Multi-Function I/O Modules - no WBK61 and WBK62 – High Voltage A da pters - no -

Information per taining to these products is included i n The WBK Options Manual, p/n 489-0902.

Reference Notes:  Adobe Acrobat PDF versions of documents pertaining to Wav eBook are

included on the Dynamic Signal Analysis CD and are automatically installed onto your PC’s ha r d -d r ive as a part of product support at the time of s oftware installation. T he default location is the Programs group, which can be accessed via the Windows Desktop Start Men u.

 After your sof tware is installed you ca n setup your WaveBook device and

connect it to the host computer. Instr uctions for Hardware S etup are included in your WaveBook User’s Manual.

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ZonicBook/618E

WBK Support

When used with ZonicBook/618E , eZ-Analyst supports WBK18 and WBK30.

System Requirements

Before setting up the hardware or in s talling the softwa r e , verify that you ha ve the following items.

• ZonicBook/618E Data A cquisition System

• Power Su p ply with cord

• Dynamic Signal Analysis CD

• License Key for eZ-Analyst

• Ether net Patch Cable

• Dynamic Signal Analysis CD

• License Key for eZ-Analyst

In addition, ver ify that your compu te r system meets the following minimum requirements.

• Monitor: SV G A, 1024 x 768 screen resolution

• Ether net jack [on PC or on a hub connected to the E thernet]

• Requires 32-bit version of Windows: Windows 2000 SP4, Windows XP,

or Windows Vista (x86)

Windows 2000 SP4 and Windows XP Users:

PC with

™

Intel

Pentium 4 or eq ui valent; 1 GB memory; 10 GB disk spac e

Windows Vista (x86) users:

PC must be Windows Vista Premium Ready

Software Inst a ll at ion for ZonicBook/618E

Remove any previous-installed versions of eZ-Analyst software before installing a new v ersion.

1. Start Windows.

2. Close all running applic a tions.

3. Insert the Dynamic Signal Analysis CD into your CD-ROM drive and wait for the CD to auto-run.

If the CD does not sta r t on its own:

(a) click the des ktop’s <Start> button (b) choose the Run command (c) select the CD-ROM drive, then select the setup.exe file. (d) click <OK>.

An Opening Screen will appear.

4. Click the <ENTER SETUP> button.

5. From the hardware selection screen [which follows a licensing agreement], select ZonicBook/618E from the drop-down list and follow the on-screen instructions.

eZ-Analyst 988490 Software Installation, ZonicBook/618E 1-3

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Reference Notes:

o Adobe Acrobat PDF versions of documents pertaining to ZonicBook/618E

are included on the Dynamic Signal Analysis CD and are automatically installed onto you r PC’s hard-drive as a part of product suppor t a t the time of software in s ta llation. The d efault location is the Programs group, which can be accessed via the Windows Desktop Start Menu.

o After your sof tware is installed you ca n setup your ZonicBook/618 and

connect it to the host computer. Instr uctions are inclu de d in the ZonicBook/618E User’s Manual, p/n 1106-0901.

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IOtech 640, 650, 652, and 655

To Install the Software

Dynamic Signal Analyzers for Vibration Analysis & Monitoring

640u, 650u, 652u, or 655u (USB2.0)

Verify that you ha ve the following items.

• 640u, 650u, 652u, or 655u

• USB Cable

• Dynamic Signal Analysis CD

• License Key for eZ-Analyst

• Requires 32-bit version of Windows:

Windows 2000 SP4, Windows XP, or Windows Vis ta (x86)

Windows 2000 SP4 and Window s XP Users:

PC with Intel

Windows Vista (x86) users:

PC must be Windows Vista Premium Ready

640e and 650e (Ethernet)

For a 640e or 650e ver ify that you have the following items.

• 640e or 650e

• TR-2U Power Supply

• Ethernet Patch Cable

• Dynamic Signal Analysis CD

• Licens e K ey s for eZ-Analyst

• Requires 32-bit version of Windows:

Windows 2000 SP4, Windows XP, or Windows Vis ta (x86)

Windows 2000 SP4 and Window s XP Users:

PC with Intel

Windows Vista (x86) users:

PC must be Windows Vista Premium Ready

1. Close all running applic a tions on the host PC.

2. Insert the Dynamic Signal Analysis CD into your CD-ROM drive an d wa it for the CD to auto-run. An Opening Screen will appear.

4. Click the <ENTER SETUP> button.

5. From the hardware selection screen [which follows a licensing agreement], select the applicable

device (640e, 640u, 650e, 650u, 652u, or 655u) from the drop-down list and follow the on-screen instructions.

™

Pentium 4 or equivalent; 1 GB memory; 10 GB disk space

™

Pentium 4 or equivalent; 1 GB memory; 10 GB disk space

(Applies to 640e/640u, 650e/650u, 652u, and 655u)

Reference Notes:

o After the software is installed you can setup your 640, 650, 652, or 655 analyzer and

connect it to the host computer. Instr uctions are inclu de d in a Quick Start shipped with the device.

o Adobe Acrobat PDF versions of documents pertaining to 640, 650, 652, and 655 analyzers

are included on the Dynamic Signal Analysis CD. In addition, they are automatically installed onto you r PC’s hard-drive as a part of product suppor t a t the time of softwa r e installation. T he default location is the Programs group, which can be accessed via the Windows Desktop Start Menu.

eZ-Analyst 896991 Software Installation, 640, 650, 652, 655 1-5

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An Introduction to eZ-Analyst 2

Features …… 2-1 Measurement Mode …… 2-4 Playback Mode …… 2-4 A Word About Configuration …… 2-5

eZ-Analyst is the result of more than ten years of software development and customer input. This software adds realtime continuous and transient data acquisition to Wave-

Books, ZonicBook/618E, and to 640, 650, 652, and 655* dynamic signal analyzers. Analysis can be in the time,

frequency, or order domain.

eZ-Analyst is operated through a series of setup windows that display only the information deemed important to your test. Acquisition configuration involves selecting desired acquisition parameters from user-friendly menus.

*eZ-Analyst can be used for the dynamic channels of the 655 device, but not for the temperature channels. If you will be using a

655 for temperature applications you will need to use other software, such as eZ-TOMAS or DASYLab.

Features

• Real-time FFT analysis

• Easy-to-use graphical user interface provides fast setup

• Large number of display options: Time Waveform, Spectrum, Auto Spectrum,

FRF, Cross, PSD, Transfer Function, Coherence, Octave, and Waterfall

• Order Normalization and Order Tracked Plots

• Multiple Plot Overlays using exported data files

• Export to Excel, ME Scope, SMS Star, or UFF Type 58 ASCII or Binary

• Save/Recall display setups with multiple display windows and overlays

• Wide selection of real-time analysis features, including integratio n/dif ferentiation

averaging, and much more

eZ-Analyst Series 896991 Introduction 2-1

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Slider

Acquisition Graph Edit Input Channel

Analog Input Tach Channels Channels

Averaging

Playback / Record Status

Status Toolbar Config. Window (Open/Close)

Status

Date/Time

Channel Identifiers

Four Function Vie w Windows in Play ba c k M ode

eZ-Analyst is a graphical analysis application that can be used to collect, analyze, record, and play back recorded data. With use of a 640, 650, 652, 655*, ZonicBook/618E, or WaveBook analyzer, ez-Analyst can collect and display multiple channels of d a ta in real-time. The graphical displa ys can consist not on ly of the raw time-domain data, but also plots of frequency domain data. F or exa m ple, r ea l time FFT (Fast Fourier Transform) plots.

Data that is recorded to disk-file is in the raw time domain and can be played back for additional analysis time and time again. For example, a raw signal can be played back overand-over using different FFT Window algorithms to m anipulate the signa l. Once the desired results have been achieved, the new data can be exported to a differen t file and format, while preserving the original file. In addition, the playback capability doe s not require the presence of analyzer hardware.

*eZ-Analyst can be used for the dynamic channels of the 655 device, but not for the temperature channels. If you will

be using a 655 for temperature applications you will need to use other software, such as eZ-TOMAS or DASYLab.

2-2 Introduction 896991 eZ-Analyst Series

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You can select the Measurement Mode or the Playback m ode from either the Ta s k pull-down menu, or by usin g the <Change Task Mode> button [the first b utton in the Task Bar]. The Task Tool Bar automatically changes to accommodate the selected mode.

1 Status

Message

2 Acquisition

Status

3 Date/Time Provides time in the following format: Day-Month-Year, Hour: Minutes: Seconds.

4 Slider Bar The sliding bar indicates the relative location of the displayed data. The record number and

5 Playback /

Recording Status

A message regarding the status, if applicable, will be displayed in this area. Examples of possible messages are: Double Hammer Rejected, Overload Rejected, Reject (Manual Reject Mode), and GAP.

Indicates the status of the acquisition. Waiting Trigger indicates that a trigger has not been recognized since the Acquire button

was click e d.

Triggered indicates eZ-Analyst is capturing and processing data based on the setup

conditions.

Acquiring indicates that data is being acquired, but is not being recorded to disk. Recording indicates that data is being recorded-to-disk, as it is being acquired. Completed indicates eZ-Analyst has finished processing the frame of data.

The “Averages Count” increments by 1 at this time.

When in Record Mode the current time is displayed. When in Playback Mode the measured time is displayed.

the number of records in the file are listed to the right. The slider can be used to q uickl y locate a specific record. Note that both the Record and the Playback mode make use of the slider bar.

Displays the current record and the total number of records to be collected. Time equivalents are included in parenthesis

Example, 12/25 means that the record currently displayed is the 12 25 records.

record, out of a total of

Averaging

Status

6 Channels Each numbered box represents a channel. Drag a channel [channel-box] to the plot area to

eZ-Analyst Series 896991 Introduction 2-3

This field shows when the Averaging Mode is used, during the Scope Mode or the Playback Mode. A display of 2/5 would indicate that 2 averages have been performed out of a total of 5 averages to be performed.

have its data displayed. That channel’s data is plotted in a distinct color and a color-coded channel button is displayed to the right of the plot.

Reference channels are bold and italic. The underlined channel is the current reference channel. Use the right mouse button to select current reference channel. Reference channels are specified in the Configuration accessed via the Edit Menu.

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Measurement Mode

The Measurement Mode is an active data-collecting mode, which, for that reason, requ ir es the use of data acquisition hardware. The Measurement Mode can only be selected if analyzer hardware is present.

The Measurement Mode a cquires data using on e of the following three methods: (1) Scope-Continuous, (2) Scope-Single, and (3) Record.

The Scope-Continuous and Scope-Single methods display data, but do not log data. The scope methods are useful for signal validation and checkout. The Record method, in addition to displaying data, logs data-to-disk based on user-defined start an d s top c riteria.

In addition to being selected fr om th e Task Menu, the Measurement Mode c a n be selected from the Task Tool B ar by clicking the < Change Task Mode> button while in th e Playback Mode. Clicking th is button from Meas urement Mode will change the task mode too l b a r to Playback.

The Measurement Mode is detailed in Chapter 3.

Change Task Mode

Scope-Continuous Scope-Single Record Cursor Lock

Measurement Mode Task Bar

Playback Mode

The Playback Mode does not require the presence of physical h a rdware. When in Playback, eZ-Analyst is strictly a post-acquisition display and analysis program. Raw time-domain data, that has been recorded-to-disk, can be played back for analysis repeatedly. For example, a raw signal could be played ba c k several times, each time using a dif ferent FFT Window algorithm to manipulate the origin a l signal. Once the desir ed results have be en achieved the new data can be exported in a new format and to a different file. Th e original file can rem a in unchanged, and kept for future analysis.

To activate the Playback Mode, select Playback/Rev iew on the Task Menu. An opti on is to click the <Change Tas k M ode> button (the first button in the tool bar) while in the Measur ement Mode. If an analyzer (acquisition hardware) is not available eZ-Analyst will automatically enter the Playback mode a nd will display the data that was most rec e ntly recorded to disk .

The Playback Mode is detailed in C hapter 3.

Change Task Mode

Play Backward, Play Backward Stop Play Play Forward One Frame at a Time One Frame at a Time

Playback Mode Task Bar

2-4 Introduction 896991 eZ-Analyst Series

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A Word About Configuration

Configuring Inpu t Channels

eZ-Analyst makes use of various menus and related windows for the purpos e of configuration. Chapter 4 is devoted exclusively to th e Edit menu. It is that m e nu which provides ac c ess to the Configuration Window (see figure). It is from the Configura tion Window that the major ity of acquisition rela ted settings are made.

eZ-Analyst Series 896991 Introduction 2-5

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Menus 3

Task Menu …… 3-1

Measurement Mode…….3-1 Playback Mode…….3-2 Input Range (Auto/Manual)……..3-3 Calibration………..3-5

File Menu …… 3-10 Control Menu …… 3-10 Export Menu …… 3-11 Window Menu …… 3-13 Edit Menu ……

see chapter 4

Waterfalls, Order Tracking, and Frequency

Slices

….. see chapter 7

Foreword

The menus, with exception of the Task Menu and the Edit Menu, are presented in the order that they appear on eZ-Analyst’s main window. The Task Menu is discussed first since it is from this menu that the user (1) selects Measuremen t M ode or Playback Mode and (2) makes use of the Auto-Ranging feature for input cha nnels.

The Edit Menu is per haps the most signif icant of all eZ-Analyst menus and is the most frequently used. Chapter 4 is dedicated solely to the Edit Menu.

Reference Note: Refer to chapter 4 f or information regarding the Edit Menu.

Note! The “Edit Menu>Configuration> Preferences tab” sec tion of chapter 4 discusses a Measurement Mode panel. This panel is of importance to file overwrite protec tion, and should be read (see page 4-38).

Refer to Chapter 7 for details rega r ding three spectrum only views: 3D Waterfall, Frequency Slice, an d Spectrum Display Split View.

Task Menu

Task Menu > Measurement Mode

The Measurement Mode is an active data-collecting mode, which, for that reason, requ ires the use of data acquisition hardware. The Measurement Mode can only be selected if an appropriate data acquisition device is used; otherwise, eZ-Analyst will run in the Playbac k Mode.

The Measurement Mode acquires da ta using one of the following three methods: (1) Scope-Continuous, (2) Scope-Single, and (3) Record.

The Scope-Continuous and Scope-Single methods display data, but do not log data. The scope methods are useful for signal validation and c heckout. The Record method, in addition to displaying data, logs data-to-disk based on user-defined start and stop criteria .

In addition to being selected fr om th e Task Menu, the Measurement Mode c a n be selected from the Task Tool Ba r by c licking the <Change Task Mode> button while in the Play back Mode. Clicking this bu tton from Measurem e nt Mode will change the task mode tool bar to Playback.

Change Task Mode

Scope-Continuous Scope-Single Record Cursor Lock

Measurement Mode Task Bar

eZ-Analyst 989090 Menus 3-1

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Note that grayed-out buttons indicate that the associated function is not available due to a prerequisite not being met.

Change

Playback Mode Task Bar

Change Task Mode

Changes the task from Measurement M o de to Playback Mode. The Task Bar buttons will change accordingly.

Record

Scope-Continuous

Scope-Single

Signal Generator The Signal Generator button toggles between two images and is only active when

Indicates that the Generator is turned ON

Indicates that the Generator is turned OFF

Cursor Lock

Export

Starts recording data-to-disk in continuous time. Note that a ZonicBook or WaveBook must be used to acquire data.

Starts a block-time data acquisitio n . This scope method is typically used to acquire impact data or to take measurements when data storage is not required.

Starts a single-time run data acquisition. This scope method is typically used to acquire impact data or to take measurements when data storage is not required.

hardware is present. The sine wave button indicates that the generator is ON. Clicking on it will turn the

generator OFF and the button image will change to a circled red line, indicating that the generator is OFF.

Clicking the button, while the “Off Status” image is present, will turn the Signal Generator back ON, and will change the button to show the sine wave image.

Note: For WaveBook applications you must set the applicable output channel (that is to generate the signal) to “Active.” See, Output Channel Setup in chapter 4.

An active cursor lock button will have the image of an opened or locked padlock. When the padlock is locked (closed), curs o rs in multiple window s will be synchronized and locked, providing that the windows are of the same time domain, frequency domain, or have the same octave band data.

An opened padlock image indicates that cursors in multiple windows have independent cursor movement, i.e., they are unsynchronized.

This button exports data, if export conditions are set. For details, see the section, Export Menu> Export Function Data.

Task Menu

The Playback Mode does not require the presence of physical hardware. When in Playback, eZ-Analyst is strictly a post-acquisition display and analysis program. Raw time-domain data, that has been recordedto-disk, can be played back for analysis repeatedly. For example, a raw signal could be played back several times, each time usin g a dif ferent FFT Window algorithm to manipulate the original signal. Once the desired results have been achieved the new data can be exported in a new format and to a different file. The original file can remain unchanged, and kept for future analysis.

To activate the Playback Mode, select Playback/Rev iew on the Task Menu. An opti on is to click the <Change Task Mode> button (the first button in the tool bar) w hile in the Measur em e nt Mode. Also, note that when a WaveBook or Zonic Book is not available, eZ-Analyst will automatically enter the Playback mode and will display the data that was mos t r e c e ntly recorded to disk.

> Playback / Review Mode

Task Mode

Play Backward, Play Backward Stop Play Play Forward One Frame at a Time One Frame at a Time

You can temporarily change three aspects of Engineering Units (EU) to customize your playback of data (see figure at right). These are EU Mode, mV/EU and EU Offset. To change the settings navigate as follows: Edit Menu>>Configuration>>Input Channels Tab; and then make the desired changes. The new settings will be applied to your playback session; however, upon closing eZ-Analyst the settings will default to those originally configured at the time the data was recorded. Chapter 4 includes additional information about the Configuration Input Channels tab.

Section of Configuration

Input Channels Tab

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Task Menu > Input Range (Auto/Manual) *

Auto-ranging is a procedure that automatically sets the input full-scale voltage (FSV) range for input channels. The FSV is set by measuring a representative sample of real-time data. Autoranging is only performed on active channels.

Auto-ranging works best if you supply the m a x im um expected voltage range for th e data that will be captured during the acquisition. Therefore, make the Auto Range Duration long enough to apply a typical si gnal. In addition, make sure that the Auto Ran g e Analysis Frequency is fast enough to ca p ture the high frequency component. Typically the Analysis Frequency will be the same setting as eZ-Analyst’s Acquisition Analysis Frequency.

AutoRange Dial og B ox, from a WaveBook

Note that AutoRange Dialog Boxes for other analyzers are similar.

* You can access the dialog box by clicking the <Au to Range> button, which is located on the

Input Channels tab, when in the “Measurement Mode.”

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Mode

The Mode panel con sists of three radio bu ttons, which ar e used to select one of the following range modes: AutoRange(%), AutoRange(V), or ManualRange(V).

Starting FSV

The Starting FS V (Full Scale Voltag e) panel consists o f three radio buttons, which are used to set the starting FS V to Maximum, Minimum, or Current.

Channel Gauges

The channel gauges, on e per ch a nnel, display the instantaneous peak value as percentage or voltage, depending on the mode tha t was selected. The color of the vertical bar has the following signific a nce:

Yellow The signal range is from 0 to the minimum Full-Scale Voltage s e t in the Auto-rang e Setup

Green The signal range is from the minimum to the maximum of the Full-Scale Voltage set in the

Red The signal range is over the maximum of the Full-Scale Voltage set in the Auto-range Setup

window.

Auto-range Setup window.

window.

%, FSVF, & Factors Display

Maximum FSV is the high-end limit for the inpu t voltage.

Note that 25.7 V is the highest possible FSV for a ZonicB ook Medallion.

Minimum FSV is the low-end limit for the input voltage. In the figure at the rig ht Minimum FSV is s e t to 0.2 volts.

HI Accept % defines the highest acceptable percentage of peak input voltage for the select ed F SV, i.e., Current, Minimum, or Maximum. Thus, if our selected FSV was 0.2 V an d we h a d an upper limit of 90%; then ou r upper limit in volts would be 0.18 V. An example follow s as to how exceedin g this value causes a range adjustment.

LO Accept % defines the lowest acceptable perc entage of peak input voltage for the selected FSV, i.e., (Current, Minimum, or Maximum). Thus, if our selected FSV was 0.2 V and we had a lower limit of 10%; then our a ctual low limit in volts would be .02 V.

Incr Factor (Increasin g Factor) is the factor by which the Current FSV will increase, should the peak exceed the upper limit. In the f igu re we s ee that the Increasing factor is

1.5. Decr Factor (Decreasing Factor) is the factor by which the Current FSV will decrease,

should the peak not reach the lower limit. Keeping the decrease fa c tor at “1” will result in no decrease of the Current FSV. Setting the Decreas e F a c tor to 0. 8 would cause the Current FSV to dec r ease to 80% of its valu e if the peak fell short of the low limit.

Note: These are the same values th a t w er e entered in the Vpeak column in the Ch a nn el Setup

window. The values are immediately replaced when the Auto ranging process begins.

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An Example of Auto-Ranging

Maximum FSV set at 25.7 V Minimum FSV set a t 0.2 V Upper Limit set at 90% Lower Limit set at 10 % Increasing Factor set at 1.5 Decreasing Factor set at 1

In the first iteration we see that we have a peak of 0.19 V. This falls outside of our band of

0.02 to 0.18 V that was established by our upper and lower limit percentages; i.e., 90% of the Current FSV and 10% of the FSV.

As a result, the Current FSV is increased by a factor of 1.5 (our Increasing Factor) and the Current FSV becomes 0.3 0 V. Our limits, in volts , also changed since we are now looking at percentages of 0.30 volts instead of the same percentages of 0.20 volts.

In the second iteration of our example, we see a 0.22 volt peak. This value is within our established limits so the C urrent FSV does not c hange.

Note 1: If the Capture Mode is the Input Channel (Trigger Mode), the Auto Range proc ess waits for a

trigger.

Note 2: A Start FSV of Minimum or Maximum can selected instead of Current FSV, as in our example.

Minimum FSV is the default.

In this example we have set the radio but ton for Current FSV instead of Minimum or Maximum (note 2). The starting value, in the example, is 0.20 V.

An Example of Auto-Ranging

Task Menu > Calibration

When calibration is pe r formed, a signa l of known Peak level [ or RMS value] is supplied t o a transducer that is connected to an active input channel. An accelerometer calibrator or piston phone is typically used to generate th e calibration signal for vibration sensors and microphones, respectively.

eZ-Analyst includes a Calibration window for se lecting the chann e ls to b e c alibrated and for entering several signal-related param eters. In addition, the calibration is actually started from the window.

Examples: Accelerometer calibrators typically make us e of linear engineering

units and, as their name implies, are used for calibrating accelerometers.

Piston phones are most often used for calibrating microphones. Piston phones typically make us e of dec ibel ( dB) engineering units.

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When you are in “Measurement Mode” you can access the Calibration w indow from the Tas k Menu or from the Input/Output Channels tab.

Calibration Display Screen

When a channel is ca librated, the numbe r of averages used will be 5, or the number that is designated in the “No. of Averages” field (located on the Analyzer Tab). The greater of the two values will be used, automatically .

A discussion of the various regions of the Calibration w indow now follows. The section conc ludes with an exa m p le.

Calibration Process

Single Channel

Multiple Channel

Used to select one ac tive channel a t a tim e . When the calibrator only has one channel output, the Sin gle Channel method must be used. When Single Channel is selected, the “A ctive” column shows a radio button next to each channel.

Used to select two or more channels for simultaneous calibration. Th is is only an option wh e n the calibrator off er s more than one output. When Multiple Chann e l is selected, the “A c tive” column shows a ch e c kbox next to each channel.

Calibration Domain

With the use of Fourier Transform, any s ignal can be viewed from a time domain or a frequency domain. Either domain c a n be selected for use in the calibration process.

Time Freq-

uency

The overall valu e is computed using time domain data. The overall value is computed w ith frequency domain data by s umming up

frequency component of FFT s pec trum.

Calibrator Frequency (Hz)

This field is used to e nter the frequency setting of the calibrator. The analysis frequency, which is twice this frequency, is us e d if possible. Otherwis e , the maximum allowed analysis frequency is used.

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Columns on the Calibration Window

No. This column displays channel numbers [1, 2, 3, … etc.] for easy reference to

their associated c e lls. The channel numbers, being for displa y indication only , are fixed and can not be edited.

Active When “Single Channel” is selected, you can clic k on a radio button in the

“Active” colum n to enable one channel for calibration . When the calibration is complete, select the radio button for the next channel to be ca librated.

When “Multiple Channel” is selected, the radio buttons are replaced by checkboxes. Ensure that each channel to be calibrated has the associated box checked, and that the r emaining channels remain uncheck ed. For multiple channel applicat ions note that you can click on the colum n label, i.e., the word “Active” to simu ltaneously check or uncheck all channel checkboxes in the column.

Note: The channel settings in the Calibration window are independent of the

selections that a pp ea r in the Input Ch a nnel Setup window. On ly active channel shows up a t calibration window.

Calibrator Type

Peak Uses the peak amplitude of th e s pec trum around the specified frequ ency of the

RMS

Calibrator Scale

This column is us e d to s e lect Peak or RMS * as the calibrator type. H ig hlight a cell, or range of cells, in the grid, then select Peak or RM S from the popup menu.

calibration sign a l. Uses a compensated overall level calc ulation to deter m ine the RMS level of the

calibration sign a l, as specified in the U nits field. *RMS – Root-mean-square, is the square root of the arithmetic mean of the

squares of a set of numbers.

This column is us e d to s e lect the calibrator s cale to linear or to decibel.

Lin Select Lin if the ca libr ator is in linear scale.

dB Select dB if the calib r a tor scale is dB.

Note: While there are several definitions to dB, in our application we are

using dB to expres s the ratio of the magnitud es of two quantities eq ual to 20 times the common logarithm of th e r atio.

The formula for dB is:

dB = 20 log (x/dBEUref)

EU dB Reference

dB EU Reference is applied to displayed data when the Y-axis scale is set to dB.

dB = 20 log (x/dBEUref)

The formula f or dB d is play for Autospectr um, Cross Spectru m , and PSD is:

dB =10 log [x/((dBEUref)^2)]

This field is used to enter the Engineering Units dB referenc e.

This is valid only for frequency doma in data. Note: The dB Reference (Volt) can be changed simultaneously for all channels

from the associated entry box in the FFT Setup Tab. The tab is accessed from the Configuration Window [via the Edit pull-down menu].

The formula for dB display f or U naveraged Spectrum, Averaged Spectrum, and FRF is:

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Calibrator

This field is used to set the Calibrator’ s Engineering Units.

Measured

Displays the measured value of the channel in milli-volts.

Transducer mV/EU

The Transducer mV/EU v a lue ca n be entered manually, or by the measurement process. Highlight a cell, or cells, in the grid bef ore typing a value in the data entry box. Then press the <OK> button to accept th e value. All other fields linked to this value are updated when the value is accepted.

mV/EU= Volts/Units * Transducer G a in

EU Offset EU Offset is us ed for DC signal compensation. Offset is ad de d to, or

subtracted from the measured EU va lu e.

Transducer Gain

Calibration Date

Start Calibration Measurement

Transducer Gain is used as auxiliary scaling to compensate for the transducer amp lifier gain. Gain is a mu ltiplied function.

This column displays the date and time of the last ca libration. If any channel value changes, even if the original number is restored, th e calibration date and time are automa tic ally removed for that channel.

Clicking this button starts the calibration process for all selected channels. At the completion of the calibration, the measured mV and the Transducer mV/EU value for the applicable channels are automatically updated.

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Calibration Procedure, an Example

Accelerometer type - Pie zotronics 303A03 Calibrator - Piezotronics 394B05 - 1.02 G (RMS) at 80Hz Unit of acceleration - in/sec^2

Note: 1.02 G RMS is equivalent to 393.811 in/sec^2 (1G =386.089in/sec^2).

This is a linear scale, thus we will be selecting Lin in the Calibrator Scale column.

In this example we will be calibrating channel 1.

1. Attach the accelerome te r to the calibrator (signal source) . Connect the other end of the accelerometer cable to the c hannel 1.

2. Set the FSV into a proper range (i.e. 32.4 mV) in the Input Channels Setup window, then click the < Apply> button.

3. Set the desired blocksize in the Analyzer Tab if a block size of greater than 4096 is desired.

4. Set the “No. of Averages ” in the Analyzer Tab if an average count of greater than 5 is desired.

5. Open the Calibration W indow from the Tas k Menu, or from the Input/Output Channels Tab.

6. Select “Single Channel.”

7. Select “Auto Range,” if desired.

8. Select a Calibration domain. In this ca se, either “Time” or “Frequency” can be selecte d.

9. Enter 80 Hz in the Calibra tor F r equency field.

10. Ensure the radio button for C hannel 1 is enabled (in the Active column.)

11. Select RMS for the Calibrator Type.

12. Select Linear in the Calibrator Scale field.

13. Leave EU dB Reference set at 1.000. Note that this step can be skipped when linear scale is used.

14. Set Calibrator EU at 1.02 ; implying an engineering unit of 1G.

15. Enter 393.811 in the Transducer mv /EU field.

16. Leave the EU Offset at 0.0000. We are assuming no offset in this example.

17. Leave 1.000 as the Tr ansducer Gain. No amplifier or attenuator is being used in our example.

18. Click <Apply> so your new values will not be lost.

19. Click the <Start Calibration Measurement> button to begin calibration.

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File Menu

The File Menu provides a means to prin t plotted data, as well as open, sa ve, and export data files.

Open Time History Data

Used to locate and open saved .dsc files.

Save [or O pen] Multiple Data Set ( .mds)

These two menu items provide a mea ns of saving [or opening] fu nction files. Time and autospectrum data is saved. If there is any reference channel cross-spectrum is saved for all channel pairs. The file extension is .mds.

Save [or Recall] Hardware Setup (.set)

These menu items provide a means of saving [or recalling] current settings and processing conditions. In a dd ition, .mds files can be used to recall setup condi tions, because these filetypes include setu p c onditions in add ition to measured data . Note that only the se tup condition is recalled.

Save [or Recall] Plot Setup (.pset)

These two menu item s provide a means of s av ing [or recalling] th e current plot cond ition, such as window location s and window content, including: channel numbers, function type, axis -type, and range. These files can be rec a lled at a later date to process c ustomized plot conditions.

Without user inter vention, the plot s e tup file is automatic a lly saved with .mds and .dsc files.

You can have plot set ups automatically recalle d whene ver you recall dat a files. To sele c t t his option, open the Preferences wind ow [accessed through the Edit pull-down me nu] and check the box labeled “Recall Plot Setup Whe n Recall Data Files.”

The standard print window associated w ith your specif ic computer will open . Select a printer and the number of copies needed before clicking <OK>.

Note: In regard to prin tin g, black plot backgrounds ch a nged to white.

Authorization

Opens an Author ization Dialog box tha t p r ovides a means of entering a license key (authorization c ode ). Use of the key enables the features of purchased software, such as eZ-Analyst. The dialog box in c ludes an option to run a 3 0 -day trial version of eZ-Analyst.

Exit

This menu item closes the eZ-Analyst application.

Control Menu

The Control Menu selections provid e the same functiona lity as the Task Bar buttons previously discussed.

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When RPC III is selected you have the choice of exporting your data in either of two

Export Window

Export Menu

Export Menu > Time History Data …

This window is us ed to export recorded files as one of four file f or mats: Text (ASCII), UNV Binary, UNV ASCII, and RPC III.

Source Information Panel

This panel, loca ted at the top of the win d ow, contains basic information abou t the source file (see figure).

Destination In formation Panel

1. Select the radio button associated with the desired file forma t; i.e., the format you want to export the data as , for example: RPC III as in the figure. (See notes below).

2. In the Filename data entry box, type the directory path and file name f or the recorded file, or use the < Browse> button to locate the desired file. Th e c or r e c t file extension will be appended to the file name later, when th e <OK> button is clicked.

3. Specify the First (Starting) and Last (Ending) records (blocks) that you want saved. In the figure, “1” (0.0000 sec) is specified for the Starting Block and “601” (240.4 sec) is specified for the Ending Block .

Step 4 follows on page 3-12.

The RPC III file f or ma t does not represent ta ch channel RP M da ta in a meaningful way. If you (a) select RPC III as the export file format and (b) have a Ta c h c hannel in the list of channels sele c ted for export, then the r esulting tach channel in the RPC III file will contain invalid da t a .

Note:

formats, Integer or Floating Point.

• Integer – When RPC III is selected, the 16-bit signed Integer format is set by

default. Integer is the preferred and more commonly used format for exporting data.

Note that there may be clipping of data when a high EU Offset value is present. A channel’s EU Offset is configured in the Input Channel s tab of the Configurations Settings window.

• Floating Point – As an alternative to Integer, you can choose to export data to RPC III double precision

Floating Point format. Flo ating Point provides greater resolution and dynamic range than that provided by the Intege r format. Floa ting Point is a more recent format that may not be supported by all third party software.

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4. Specify the channels of interest. Click to plac e a checkmark in the channel box for eac h of the channels you want to export. The s ele c te d c hannels will be adjusted to contin uous channels startin g with channel 1, bu t all the properties [including labels] will r etain the old definition. For example, s elec ted channels 1,3,5,6,8,16 would be adjusted to ch a nnels 1,2,3,4,5,6 in the exporte d file.

5. If desired, change the gain and/or of fset values on a per-channel basis.

6. Click the <OK> button.

Export Menu > Function Data Set(s)

This menu item is for e xporting function files.

1. Select the type of file you want.

2. Type the directory path a nd file name for th e function file, or u s e the <Browse> button to locate the desired file.

3. If you want to have rec or ds automatically a p pended to the specified file, select Automatic Save after Averaging.

4. Specify either All Ch. Pairs, or Displayed Ch. & Functions.

• All Ch. Pairs - exports a ll the data for all the c hannels pairs so that all functions

can be retrieved if desired.

• Displayed Ch. & Functions - exports only the data for the displayed functions.

5. Click to place a checkmark by each of the func tions to be saved. See th e following note.

6. Click <OK>.

Note: Selected functions ca n not be saved without the display of a warning prompt. This is in

case the selection is not valid. For ex a mple: if the function s FRF, Cross, and Coh e r ence were selected, but no reference channels were selected, then the three func tions could not be saved. This is because th es e th r ee functions require a referenc e c hannel.

Export Function Data

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Window Menu

Menu Items

Add Function View (FV) …… 3-13 Add Strip Chart …… 3-13 Delete Window …… 3-14 Input Channels …… 3-14

Acquisition Setup …… 3-15 Measurement Status …… 3-17 User Comments ……3-16 Cascade …… 3-17 Tile Vertically ……3-17 Tile Horizontally …… 3-18 Refresh Windows …… 3-18

Buttons ……3-14 Status …… 3-14 Locations….… 3-15 Tachometer …… 3-15

Reference Note: For information re garding the intera ctive features of Plot Display Window s,

including the Gr a phic Toolbar button s, refer to chapter 5. The interactiv e features are not selected from the Window Menu, but are accessed via toolba r buttons, the mouse and/or hotkeys. Appendix A provides tables of the various hotkey functions.

Window Menu

> Add Function View (FV)

This menu selecti on opens an additiona l p lot window.

Example of an Adde d F unction View

Reference Note: Three buttons become enabled at the ri g ht side of the main w indow toolbar for

most single-display function views (FV), i.e., when frequency is used for the x-axis scale instead of time.

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Window Menu > Add Strip Chart

Status

This menu selecti on opens a strip cha r t p lot window.

Example of an Added Str ip Chart

Window Menu > Delete Window

Deletes the window that is currently in focus. When multiple plot windows are open, one is always the “focus window. When a window does not have focu s , its title bar is dimmed. To change the “focus window,” simply c lic k on top or side border of the window of inte r est.

Window Menu

Buttons

Status

> Input Channels

The Input Chann els window is selected f r om the Windows pull-down menu.

When selected, “Buttons ” removes the channel button boxes from the toolbar and dis p la ys them in a floating window. The buttons are used in the exact same manner as when they were located on eZ-Analyst’s main window. Removing the checkm a r k from “Buttons” pla ces the channel buttons back onto the toolbar. Note that the <Input Channel Buttons> button [located on the toolbar, ju st to the left of wher e the channel buttons r e s id e] p rovides the same functionality. See chapter 5 for loca tion.

• To add a channel: use the mouse to click and drag a channel box from the

complete channel button display into the plot area.

• To remove a channel: use the mouse to click and drag a channel box (from the

right-side of the plot) into the p lot area.

The Status dialog box (following figure) uses a char t to indic ate the followin gs:

• Volts linear

• percent of the Full-Scale Voltage (FSV)

The status box includes “maxim um” bars to show the hig hest level of signal v a lue reached by each channel during th e measurement process.

+/- FSV The Full-Scale Volta ge Delta % The percentage difference between the measured v oltage

Meas V

Measured Voltage

and the Full-Scale voltage, such that Meas V is n% of FSV; with n being the v alue of Delta %.

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Locations

This window disp la ys the current modal loc ations.

Modal Locations Window

Clicking on the left or right arrow keys increments or de c r e m ents the modal locations based on the bank setup c r iteria set in the Conf iguration - FFT Setup Tab. The change in locations is dependent upon the active r eference and response channels, and whether Response Incr ea s e or Reference Increas e is s elec ted.

Tachometer

This window displays thr ee fields: tachometer channel number, measurement, and units. Tachometer channels are set up in the Input Channels Window. See the Tach Channels section of chapter 4 for additional information.

Window Menu > Acquisition Setup

Selecting “Ac quisition Setup” brings up a display of setu p information pertaining to the acquisition, e.g., Analysis Frequency, Blocksize, Trigger, Mode, etc.

Acquisition Setu p

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Window Menu > Measurement Status Panel

The Measurement S ta tus Panel and Modal Locations Win dow

on Top of a Plot Window

Note: The bracketed lette r s p er tain to definition s provided in the foll owing text. The panel provides basic, b ut important information, including trigger and processing

conditions, and reference and response coordinates. Status Areas of the panel are as follows:

[A] – Averaging Status. Displays th e number of measurements completed followed by the tota l

number of measuremen ts . For example, “1/6” indicates that 1 of 6 mea s urements has been completed.

[B] – Trigger/Processing Status. Disp la ys the following:

T – Triggered W- Waiting for Trigger S – Saved the data C – Completed measurement O – Overload rejected D (with yellow bac kground) – Double Hammer R ejec ted

[C] – First Response Coordinate. Sh ows the channel number and the modal location . (Note 1) [D] – First Reference Coordinate. Sh ows the channel number and the modal location. (Note 1)

Note 1: A Response or a Referen c e Coordinate with a yellow backgroun d indicates that the

field is used for the “increas ing” method. For example, the R es ponse Field (figure, item “C”) with a y e llow background mea ns that the response increase method is being used. This is discussed in the FFT Setup Tab section of chapter 4.

Note 2: Measurement Status indicators are disabled when recording.

The large size of the status areas allows the user to see the measurement status from a relatively long distance, i.e., a s compar ed to the very limited viewing range of fered by standard-sized GUI text display fields. The feature has proven useful in one-man “impacttesting” operati ons pertaining to m odal type measurements.

Window Menu

Selecting “User Commen ts ” brings up a size-adjustable dialog box, whic h consists of a text fie ld. User Comments provides the user a means by wh ic h he or she may review previous comments and add n ew ones.

> User Comments

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Window Menu

> Cascade

When you have multiple plot windows open, this menu selection arrang es them on you screen as shown.

Example of using Ca sc ade with three Pl ot Windows

> Tile Vertically

When you have multiple plot windows open, this menu selection arranges them on your screen as shown. The Graph Toolbar, discussed in chapter 5, includes a button to allow for quick vertical tiling. R e fer to that chapter for button descrip tions and locations .

Example of using Vertical Tile with two Plots

Each plot is longer in the “vertical” direction.

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Window Menu > Tile Horizontally

When you have multiple plot windows open; this menu selec tion arranges them on your screen as shown. The Graph Toolbar, discussed in chapter 5, includes a button to allow for quick horizontal tiling . Refer to that chapter for button descriptions and loca tions.

Example of using Horizontal Tile with two Plots

Each plot is longer in the “horizonta l” direction.

Window Menu > Refresh Windows

Used to refresh a window; for ex a m ple, to refresh a Strip Chart. In this case, the refresh func tion blanks out the present Strip Chart, essentially providing you with a new, clean window.

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Edit Menu 4

The “Edit Menu>Configu ration> Preferences tab” section discusses a

Measurement Mode panel. T his panel is of importa nce to file overwrite protection; and should be understood (see page 4-41).

The Edit Menu provides a means of c onfiguring eZ-Analyst in regard to both functionality and appearance . The menu contains the following select ions:

Configuration Window …… 4-1

Analyzer Tab …… 4-3 Input Channe ls Tab …… 4-15 Analog Input Channels …..4-16

Tach Channels ….. 4-20

FFT Setup Tab …… 4 -25 Recording Se tup Tab …… 4-33 Block Rejection Tab …… 4-36 Octave Setup Tab …… 4-38 Preferences Tab …… 4-40

Output Channel Setup ….. 4-44

ZonicBook/618E and WaveBook Waveform Output …… 4-44 640u and 640e Waveform Output …… 4-46

Playback Setup Window …… 4-56 Display Preferences Window …… 4-57

Edit Menu > Configuration . . .

Configuration provides a means of changing the m ajor ity of eZ-Analyst settings in regard to

how data is collect ed and conditioned. The Configur a tion selection display s one of several tab dialogs as listed in the preceding

contents and discu s s ed in the following pages. Before rea ding about the Analyzer tab you should read page 4-2, which contains important information on frequency resolution.

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A Note Regarding Frequency Resolution

This note pertains to frequency resolution and is related to the v a lues seen in the Analyzer Tab’s Acquisiton Pan e l ( next two figures) . The frequency resolu tion is related to the Analysis Fre quency (bandwidth), the nu m ber of spectr a l lin es , an d the Nyquist factor (a user-selected varia ble) . It is also related to th e number of data points in one block of data (the blocksiz e ). The program automatically a dj usts the blocksize to m aintain the selec ted spectral lines . The following equ a tions apply.

b = S (n) and S = b / n

w = b / (n x f) and w = S / f

Where:

S = Spectral Lines w = Frame Width (in seconds) b = Blocksize n = one of 3 selectable

Nyquist Factors. These are:

2.56, 5.12 and 10.24 f = Analysis Frequency

“Delta X” Frequency = 1 / w

Where:

“Delta X” Frequency is the frequency r e s olution w = Frame Width

With these equation s we can see how the Frame Width and Delta X (Frequency) are calculated.

With other factors unchanged . . .

 Increasing Spectral Lines increases Frequency

Resolution.

 Increasing Anal ysi s Fre quency decreases Frequency

Resolution.

 Increasing the Nyquist Factor results in a higher

blocksize (more data points). The number of spectral lines remains constant, unless changed by the user .

The lower the “Delta X” frequency, the higher the Frequency Resolution. Thus, a “Delta X” Frequency of

6.25 Hz indicates a higher frequency reso lution than does a “Delta X” Frequency of 100 Hz.

Example 1 (see figure) Given:

Analysis Frequency 2000 Hz Spectral Lines 800 Nyquist Factor 2.56

w = S / f = 800 / 2000

= 0.4 seconds Also, since blocksize equals

Spectral Lines times Nyquist factor ( S x n) we would have a blocksize of 2048 , i.e ., 800 x 2.56. Thus:

w = b / 2.56 x freq. = 2048 / (2.56)(2000) = 0.4 seconds

Delta X (Freq) = 1/w = 1 / 0.4

= 2.5 Hz

Note: A “Delta X” Fre q. of 2.5 Hz indicates a higher frequency resolution than a “Delta X” Freq. of 100 Hz.

Higher frequency r e solutions indic a te that the signal trace will be ba sed on more data points for a given time frame. The higher t he frequency re solution, the smo other the trace will be.

Acquisition Panel on

the Analyzer Tab

The values shown pertain to example 1.

Speed Range and Order Range are the theoretical limits for RPM and Orders based on the current settings for Analysis Frequency, Spectral Lines, and the Nyquist Factor.

Example 2 (no figure) Given:

Analysis Frequency 5000 Hz Spectral Lines 50 Nyquist Factor 2.56

w = S / f = 50 / 5000

= 0.01 seconds

Delta X (Freq) = 1/w = 1 / 0.01

= 100 Hz

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Edit Menu > Configuration > Analyzer Tab

The Analyzer Tab consists of four panels:

Acquisition Filters Trigger Averaging

Analyzer Tab

Edit Menu > Configuration > Analyzer Tab: Acquisition Panel

The Acquisition Panel provides a mea ns of setting Analysis Frequency (in Hz or CPM), Spectral Lines, and Nyquist Factor. The Acquisition frame has a note stating the calculated values for Frame Width, Delta X (Time), and Delta X (Frequency). Two examples are presented on the preceding page. "Speed Range" and "Order Range" are included in the on-screen note. They are the theoretical l im its for RPM and Orders based on the cur rent settings for Ana lysis Frequency, Spectral Lines, and the "Nyquist Factor.

Analysis Frequency: This se c tion of the Acquisition Panel is used to s e t the maximum bandwidth for analysis. Frequen cy components above the Analysis F r e quency setting will result in aliasing errors in t he data. The bandwidth measu r ement can be set for Hertz (Hz) or Cycles Per Minute (CPM) by us e of radio buttons. Note tha t the processing time for a selected blocksize is fixed by CPU speed.

Increasing the analysis frequency results in:

(a) the hardware streaming packets of data more frequently to the software (b) a greater demand placed on the software to proc es s the data blocks, and (c) less time between data blocks available for task performance.

Spectral Lines: This section of the Acquisition Panel is used to set the number of spectral lines. You can multiply the spectral lines by the nyquist f actor to find out the number of data points in a frame or b loc k of data. Blocksizes, which are automatically determined (spectral lines times nyquist), can range from 128 to 16384 data points. A blocksize can be viewed as a chunk, or packet of data that moves through software algorithms.

As the number of spectral lines inc r ea s es , the amount of data increases, the time required to acquire a block of data increases, and the amount of space required to save the data increases.

Nyquist Factor:

A user-selected factor, for w hich waveform frequency is multiplied by, to

ensure that a sampled analog signal is accurately reconstructed. eZ-Analyst has up to three selectable Nyquist Factors: 2.56, 5.12, and 10.24, depending on the hardwa r e being u s ed. The 2.56 Nyquist Factor should be used in most cases as it is the most efficient in FFT Analysis. However, if you suspect signal aliasing, a Nyquist factor of 5.12 or 10.24 sh ould be selected. Higher N yquist Factors result in more time data in the FFT Analys is .

Note: The maximum available Analysis Frequency is reduced for higher Nyquist Factors. Note: WaveBook and ZonicBook systems may run at an analysis frequency which differs

slightly from the user setting. The difference is due to the fact th a t th es e tw o devices use a discrete interva l pacer clock to control the acquisition scan rate. Consult the respective hardware manuals for specifications.

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Effects of Changing Analysis Frequency, Spectral Lines, or Nyquist Factor

The effects indicated by thes e two tables are based on chan gin g one parameter only. If the Analysis Frequency, Spectral Lines, and/or Nyquist Factor are changed [for the same acquisition], then the tabled-effect from the other var iables c a n differ, depending on the magnitude and direction of c hange of those variables.

Analysis Freque ncy or Nyquist Factor Direction

of Change

Increase Larger

Decrease Smaller

File Size (Recorded Data)

disk file

Data Block AcquisitionTime*

Faster Faster screen

Slower Slower screen

Data Displayed in Scope Mode

updates

Frequency Resolution

Lower (higher Delta X)

Higher (lower Delta X)

Spectral Lines Direction

of Change

Increase Larger

Decrease Smaller

*Data Block Acquisition-Time: The time it takes to acquire on e block of data.

File Size (Recorded Data)

disk file

Data Block AcquisitionTime*

Slower Slower screen

Faster Faster screen

Data Displayed in Scope Mode

updates

Frequency Resolution

Higher (lower Delta X)

Lower (higher Delta X)

Edit Menu > Configuration > Analyzer Tab: Filters Panel

Filter Panel functionality does n ot a p ply to WaveBook direct channels.

Filters Panel

Apply Low Pass Fil t er: When selected, a low pass filter provides alias protection an d removes undesired frequencies from the m ea s ured response for each associated channel.

AC Coupling (High Pass Filter): When AC Coupling is selected in the Input Channels tab, the associated input signals will pass through a 0.1 Hz or a 1 Hz High Pass Filter, depending on the product and on wh ich radio button is selec ted (see note).

The AC coupling opt ion of selecti ng 0. 1 Hz or 1 Hz is availa ble only on ZonicBook/618E an d W B K 18 modules [that are bei ng used in conjunction with a ZonicBook/618E]. When a WBK 18 is used with a WaveB ook/516E, choosing AC Coupling [in the Edit Configuration me nu ] automaticall y enables filtering at 0.1 Hz.

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Edit Menu > Configuration > Analyzer Tab: Trigger Panel

The Trigger Panel provides a mea ns of setting and defining trigger-related parameters.

Triggering defines how eZ-Analyst is to begin the task of capturing and processing data. To capture data without using a trigger, select Free Run from the pull-down list. To capture transient data, select Input Channel from the pulldown list and set values for the applicable parameters.

Trigger Panel

on the Analyzer Tab

A Breakdown of the A nalyzer Tab’s Tr igger Panel

Category Description

Type If “Free Run” is selected as the Type, the data acquisition and process ing will

begin as soon as th e <Acquire> button is c licked. Select “Free Run” if you want to measure data in a continuous or Scope mode man ner [from an active system].

If “Input Channel” is selected as the Type, the data acquisition and processing begin after the signal on th e s pec if ied c hannel reaches the defined trigger conditions. Se lec t “Input Channel” if you want to capture tra nsient data.

“TTL Pulse” applies to the TRIGGER INPUT BNC on Zonic Book/618E and to the TTL TRIGGER on W av e Book’s DB25 connector (pin # 13). The input a ccepts a 0 to 5 V TTL compatible signal. Latenc y is 300 ns.

Channel No.

Level This value is th e point that the signal must pass through to be c onsidered as a

Slope Slope icon buttons a r e used to select a “Positive” rising (up arrow) or a

PreTrigger

Specifies the channel that the trigger condition applies to.

candidate for a trigger. This value is entered as volts and mus t b e within the selected FSV.

“Negative” falling (down arrow) s lope of the signal that def ines a trigger condition. The signal must be on the defined slope before it can be considered for use as a trigger

Selecting the “Pre-Trigger” icon button (arrow will point left) instructs the system to capture a specified per c entage of data [a specified per c ent of the frame size] prior to the start of trigge r event. In the previous figure we see that “Pre-Trigger” is selected for 10.00 (%).

Note: For IOtech 640, 650, 652, and 655 devices, a maximum pre-trigger

percentage exists for each combination of analysis frequ e ncy, number of spectral lines, a nd number of analog input channels. Entering too high of a percentage results in an error message. You can use the following 5 tables to see the allowed maximum pr e-tr igger percentage for your configuration.

eZ-Analyst 889691 Edit Menu 4-5

Page 38

Maximum Pre-trigger Percentages for 640, 650, 652, and 655 Devices

This section is provided for individuals who want to know the maximum pre-trigger percentage for the configured number of input channels, spectral lines a nd the analys is frequency. The secti on consists of 10 tables. All ten tables ap ply to the 10channel 652 and 655 devices. The first five tables apply to 640 and 650 devices.

To determine the percentage:

1) Go to the table for the number of input channels being used (up to 10 channels).

2) Select the row that matches the number of spectral lines.

3) Look do wn the column that matches the selected analysis frequency.

4) The result (where row and column intersect) is the maximum pre-trigger percentage.

Example: with 1 channel, 500Hz, and 12800 spectral lines we have a maximum pre-trigger percentage of 47% .

For 1 Channel

20Hz 50Hz 100Hz 200Hz 500Hz 1kHz 2kHz 5kHz 10kHz 20kHz 40kHz

Frequency

25600 1 5 5 23 23 95 95 99 99 99 99 12800 2 11 11 47 47 99 99 99 99 99 99

6400 5 23 23 94 99 99 99 99 99 99 99 3200 12 47 47 99 99 99 99 99 99 99 99

Spectral

Lines

1600 22 91 99 99 99 99 99 99 99 99 99

800 45 99 99 99 99 99 99 99 99 99 99 400 90 99 99 99 99 99 99 99 99 99 99 200 99 99 99 99 99 99 99 99 99 99 99 100 99 99 99 99 99 99 99 99 99 99 99

50 99 99 99 99 99 99 99 99 99 99 99

For 2 Channels

20Hz 50Hz 100Hz 200Hz 500Hz 1kHz 2kHz 5kHz 10kHz 20kHz 40kHz

Frequency

25600 1 5 5 21 21 87 87 99 99 99 99 12800 2 10 10 43 43 99 99 99 99 99 99

6400 5 21 21 87 87 99 99 99 99 99 99 3200 10 43 43 99 99 99 99 99 99 99 99

Spectral

Lines

1600 20 86 86 99 99 99 99 99 99 99 99

800 41 99 99 99 99 99 99 99 99 99 99 400 83 99 99 99 99 99 99 99 99 99 99 200 99 99 99 99 99 99 99 99 99 99 99 100 99 99 99 99 99 99 99 99 99 99 99

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3200

For 3 Channels

20Hz 50Hz 100Hz 200Hz 500Hz 1kHz 2kHz 5kHz 10kHz 20kHz 40kHz

Frequency

25600 0 3 3 14 14 58 58 99 99 99 99 12800 1 7 7 29 29 99 99 99 99 99 99

6400 3 14 14 58 58 99 99 99 99 99 99

Spectral

Lines

3200 6 28 28 99 99 99 99 99 99 99 99 1600 13 57 57 99 99 99 99 99 99 99 99

800 27 99 99 99 99 99 99 99 99 99 99 400 54 99 99 99 99 99 99 99 99 99 99 200 99 99 99 99 99 99 99 99 99 99 99 100 99 99 99 99 99 99 99 99 99 99 99

50 99 99 99 99 99 99 99 99 99 99 99

For 4 Channels

20Hz 50Hz 100Hz 200Hz 500Hz 1kHz 2kHz 5kHz 10kHz 20kHz 40kHz

Frequency

25600 0 2 2 10 10 43 43 99 99 99 99 12800 1 5 5 21 21 87 87 99 99 99 99

6400 2 10 10 43 43 99 99 99 99 99 99

Spectral

Lines

1600 9 42 42 99 99 99 99 99 99 99 99

800 19 85 85 99 99 99 99 99 99 99 99 400 39 99 99 99 99 99 99 99 99 99 99 200 79 99 99 99 99 99 99 99 99 99 99 100 99 99 99 99 99 99 99 99 99 99 99

50 99 99 99 99 99 99 99 99 99 99 99

For 5 Channels

20Hz 50Hz 100Hz 200Hz 500Hz 1kHz 2kHz 5kHz 10kHz 20kHz 40kHz

Frequency

25600 0 2 2 8 8 34 34 99 99 99 99 12800 0 4 4 17 17 69 69 99 99 99 99

6400 1 8 8 34 34 99 99 99 99 99 99 3200 3 17 17 69 69 99 99 99 99 99 99

Spectral

Lines

1600 7 34 34 99 99 99 99 99 99 99 99

800 15 68 68 99 99 99 99 99 99 99 99 400 31 99 99 99 99 99 99 99 99 99 99 200 62 99 99 99 99 99 99 99 99 99 99 100 99 99 99 99 99 99 99 99 99 99 99

50 99 99 99 99 99 99 99 99 99 99 99

eZ-Analyst 889691 Edit Menu 4-7

Page 40

Note: The following five tables apply to 652u [which has 10 channels]. They do not apply to 640 and 650 devices.

0 1 1 7 7

0 3 3

1 7 7

Frequency

0 1 1 6 6

0 3 3

1 6 6

0 1 1 5 5

0 2 2

1 5 5

For 6 Channels

20Hz 50Hz 100Hz 200Hz 500Hz 1kHz 2kHz 5kHz 10kHz 20kHz 40kHz

Frequency

25600 12800

6400 3200

Spectral

Lines

1600

800 400 200 100

For 7 Channels

20Hz 50Hz 100Hz 200Hz 500Hz 1kHz 2kHz 5kHz 10kHz 20kHz 40kHz 25600 12800

6400 3200

Spectral

Lines

1600

800 400 200 100

99 99 99 99 99 99 99 99 99 99 99

For 8 Channels

20Hz 50Hz 100Hz 200Hz 500Hz 1kHz 2kHz 5kHz 10kHz 20kHz 40kHz 25600 12800

6400 3200

Spectral

Lines

1600

800 400 200

36 99 99 99 99 99 99 99 99 99 99

100

Frequency

4-8 Edit Menu 889691 eZ-Analyst

Page 41

0 1 1 4 4

0 2 2 9 9

0 4 4

1 9 9

Frequency

0 1 1 4 4

0 2 2 8 8

0 4 4

1 8 8

For 9 Channels

20Hz 50Hz 100Hz 200Hz 500Hz 1kHz 2kHz 5kHz 10kHz 20kHz 40kHz

Frequency

25600 12800

6400 3200

Spectral

Lines

1600

800 400 200 100

For 10 Channels

20Hz 50Hz 100Hz 200Hz 500Hz 1kHz 2kHz 5kHz 10kHz 20kHz 40kHz 25600 12800

6400 3200

Spectral

Lines

1600

800 400 200 100

99 99 99 99 99 99 99 99 99 99 99

eZ-Analyst 889691 Edit Menu 4-9

Page 42

Continued from page 4-6

PostTrigger

Selecting the “Post-Trigger” icon button (arrow will point right) instructs the system to skip a specified percentage of data [a specified percent of the frame size] after the start of trigger event. If we selected “Post-Trigger” and entered

10.00 in the percent box, we would see 10% of the data skipped, in relat ion to frame size.

Beep Sound

If desired, check a box so a “beep” will sound when the Trigger is Ready, or when the system has Triggered. If rapid triggering/acquiring data events are taking place in succession, then the beep sound may become erratic.

Select Free Run from the Analyz er Tab’s Trigger Pan e l if you want to measure data in a c ontinuous or Scope mode manner [from an active system].

To capture transi ent data, go to the Conf iguration dialog f ound under the Edit menu and on the Ana lyzer tab selec t I npu t Channel and speci fy the applicable channel and conditi ons.

Trigger-related items [in the Analyzer Tab or Recording Set up T ab] being locked-out indica tes that the curre nt mode is for play ba c k operation. If so, perform the fol lowing:

(1) close the Configuration Wi ndow (2) select “Measurement Mode” from the Task pull-down menu (3) open the Configuration window

Capturing Transient Data

Setting eZ-Analyst to trigger on an Input Channel captures transient data when the associated parameters are correctly specified. The following sections discuss the associate parameter and how they apply to a signal such as an impact hammer striking an object. The signal show is from an accelerometer located in the hammer’s head.

Set Trigger level:

The first and most important parameter is the trigger level. T his parameter specifies the level in which the sign a l m ust pass through in ord er for an acquisition process to begin. An ideal level will assur e that the signal is well a b ove any noise or err oneous movement that will cause a trigger. An ideal level will also assu r e that the level is not above the maximum ou tput of the signal source . Violating these ideal conditions c a n result in either a premature trigger or no triggering at all. For example, if a s ignal has a noise floor of 0.5 volts and the tr igger level is set to 0.2 volts the a c q uisition will always trigger for obvious reasons. Conversely, if the maximum signa l output is 5.0 volts an d the trigger is set to 5.5 volts the acquisition will never trigger.

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(D)

Post-Trigger

Shifting a Waveform with Pre-Trigger and Post-Trigger

(A) Setting Signal Position

Once an acceptable trigger level has been ascertained, positioning the signal within a block of sampled data (and in the display window ) is the next consideration. O ften it is necessary to capture the events that lead up to the tri gg er point. If this is the situation then positioning shou ld be s et for Pre-trigger capturing. On the other hand, if the signal of interest occurs after the tri gger point, then positioning should be set for Post-Trigger capturin g.

(B) Normal Trigger

Normal Triggerin g is ob tained by specifying zero for the Pr eTrigger and zero for the PostTrigger; where the trigger point occurs at the fir s t sample point as pictured in the figure to th e left.

To capture information before the trigger point, s elect PreTrigger and specify a percen ta ge of the frame size. This has the effect of shifting the waveform to the right as pictur ed in the figure.

(D) Post-Trigger

Post-Trigger is the opposite of Pre-Trigger. Post-Trigger causes eZ-Analyst to wait “n%” samples before it begins filling a block of data. Th is has the effect of shifting the s ignal to the left.

Note: The trigger level is an absolute signal l evel that must be within the FSV.

Reference Notes:

The following sec tions of this document contain inf or m ation that closely r elates to the subject of Ca pturing Transient Da ta. Reading over the following mater ia l s hould improve your unders ta nding of the important concepts in volved.

 Capturing Transient Data, page 4-10.  Recording Setup, page 4-33.  Block Rejection T a b , page 4-36.



Considerations Regarding Double Hammer Rejection , page 4-37.

eZ-Analyst 889691 Edit Menu 4-11

Page 44

Edit Menu > Configuration > Analyzer Tab: Averaging Panel

The Averaging Panel is us ed to selec t th e ty pe of a veraging that will be ca lculated during data acquisition.

 To apply averaging to time-domain data , t he Function View W indow must

be changed to a Windowed “Time Functi on,” otherwise all averaging wil l be applied to a spectral data.

 Averaging can be used to decrease the noise in a measurement.

In the figure below , the first scenario shows the pull-down menu expanded, revealing the types of averaging that can be selected. The second scenario shows that “Exponential” has been selected. Exponential m a kes use of a Weighting Factor, which is not used by the other averaging types.

Averaging Panel of Analyzer Tab (2 Views)

A brief description of avera ging types and other panel terms now f ollows. Linear (+): All blocks of da ta a r e trea ted equally in terms of their effect on the averaged

result. Exponential: Similar to linear averaging, Exponential requires a weighting factor that either

increases or decreases the effect of each new data block on the resultant average. Weighting Factor: The Weighting Factor either incre a s es or dec r ea s es th e effect of each

new data block on the resultant average when Exponential A veraging is used.

New Average = ((New Data) * A.W.F.) + (Old Average * (1-A.W.F))

Peak Hold: The resu lta nt block of data is a colle ction of poin ts that represent th e pe a k

amplitude for eac h point in the block. W ith each new block of data , the current data is compared with the new data on a point by point basis. The hig hest amplitude for eac h point in the block is retained.

Linear (-): Also known as Negative Averaging; Linear (-) Averagin g is a tec hnique used to identify the natural frequencies of in-service machines that cannot be shut down for analysis. Linear (-) Averaging is a two step process. First, a reference average is acquired. Second, a normal linear average is acquired for each frame. The running average is subtracted from the reference average and th e r es ult is displayed. The first time you a ttempt to start data acquisition af te r you select Linear (-) averaging, the Negative Av era ging Setup/ Measurement window opens. An ex a m ple of how to perform negative averaging follows these definiti ons.

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Page 45

Time Sync: Time synchron ous averaging uses a keyway , or a similar point of reference, a s a tr igger. The blocksize is s e t to a llow enough tim e for at least one full r evolution. This mus t b e p er formed in Scope Mode. Channel trigger mode should be used in con junction with this sele c tion.

Number of Averages: This number specifies the con dition for terminating a data acquisiti on sample. After the number of averages ( blocks/frames of data) ha v e been captured and averaged, the eZ- Analyst will automatically stop taking new da ta. This sample can then be saved. If the number of averages is set to zer o, acquisition is c ontinuous and mu s t b e halted by the user.

Continuous Meas urement: Checking this option resta r ts the averaging process without user intervention. Note that the data itself is not continu ous between measurements. This option is not meaningful for non-averaging operations.

Save after Averaging: W hen this option and c ontinuous measurement are enabled, da ta will be exported to function data sets when the desired number of aver a ges has been completed. If this option is not enabled, us er has the option of manually saving an M D S f ile or exporting data.

Reference Notes: The following sec tions of this document contain inf or m ation that closely r elates to the subject of Averaging. Reading over the following material should improve your understanding of the important conc ep ts involved.

 Function Data Sets, page 3-12  Capturing Transient Data, page 4-10.  How to Perfor m Negative Averaging, 4-13.  Recording Setup, pa ge 4-33.  Block Rejection Tab, page 4-36.  Considerations R ega r ding Double Hammer Rejecti on , page 4-37.

How to Perform Negative Averaging

1. Perform an impact measurem ent, with Averaging set to “Linear +” and “Triggered Acquisition.” Take 5 to 10 impacts on a running machine.

2. Select “Spectrum Display.” View Results.

3. Then change to “Free Run Ac quisition” with Averaging set to “Linear –.” Take 10 to 20 averages.

4. Start Scope Measurement. Select “Use Current Spectrum as Reference.” Note that the Displayed Spectrum is a Negative Averaged Spec tr um. The running

Spectra is subtracted from th e Impact + Running, and you are lef t with the Impact vibration.

In regard to the f ollowing three scree n shots, the firs t shows the impa ct spectra on the non- running motor; the second shows the impact spectra on a running motor; and the third shows the Negative Average spectra. If you compare the Negative Average spectra to the nonrunning impact you will notice that the Running S pe ed vibration has been subtracted out, leaving Resonances.

eZ-Analyst 889691 Edit Menu 4-13

Page 46

Impact Measurement on a Non-running Motor

Impact Measurement, 10 Averages on a Motor Running at 3600 R P M

4-14 Edit Menu 889691 eZ-Analyst

Page 47

Negative Ave r a g i n g

Edit Menu > Configuration > Input Channels Tab

The Input Channels tab displays the current se tup conditions of the 8 Analog Input Channels (CH1 through CH8) and the 4 Tac hometer Channels (T1, T2, T3, and T4) on a channel-bychannel basis. It also provides a means of changing the input channel settings. These changes are accepted as soon as the <Apply> or <OK> button is clicked.

Note: Output channel configuration is discussed on page 4-15.

When using WaveBook hardware, eZ-Analyst supports up t o 64 c hannels of input. If your Wa v eBook’s hardware configuration has more than 64 channels, eZ-Analyst will display an error message and enter the Playback mode. If you wish to use Measurement mode you will have to reduce the channel count by removing expan sion modules. To remove the expansion

modules you must p hysically disconnect them from the WaveBook system.

When using ZonicB ook/618E hardware, eZ-Analyst supports up to 56 channels of input. I f your ZonicBook/618E hardware configuration has more than 56 channels, eZ-Analyst will display an error message and enter the Playbac k m ode. If you wish to r un in the Measurement mode you will have to reduce the channel count by removing ex pansion modul es by physically disconnecting them from the Zoni cBook/618E system.

If any ZonicBook Tach channel is set f or P eriod Mode measurements, all ZonicBook Tach cha nnels may be out of phase in relation to t he ZonicBook Dynamic channels. If additional in-p ha se Tach channel s a r e n e eded, you must use Dynamic channels configured as Tach chan nels.

eZ-Analyst 889691 Edit Menu 4-15

Page 48

Configuring Analog Input Channels

Analog Input Channels (CH1 – CH8)

Tachometer Channels (T1 – T4)

No. This column lists the available analog input channels; for example, channels 1

through 8.

Input Channels Tab

Active Initially all input channels are active. To set unused channels to OFF, remove the

check from the associated “Active” checkbox.

Label This should be a meaningful name. Highlight a cell before typing a label. Wh en

you press the <Enter> key, the <A pp ly> button, or the <OK > button the label is accepted.

Ref / Resp

There are two types of channels, Reference and Response. All channels are initialized as Response channels. If you are using a force channel, then (1) highlight that channel’s Response/Reference cell, and (2) select Reference on the resulting popup menu.

FS Full-Scale Voltage. The cells in this column are used to set the full-scale voltage

value in Volts.

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Page 49

IEPE

IEPE supportive analog channe ls have a 4mA bias current available for contin uous

(Integral Electronics Piezoelectric)

The Institute of E nvironmental Sc ie nce and Technolo gy adopted the term IEPE (Integral Electronics Piezoelectric) to identify what had been common ly referred to as ICP however, ICP is registered by PCB Pizeotronics.

(Integrated Circuit Piezoelectric). The two terms are synonymous;

use by signal inp ut transducers, as indicated in the following table:

Device Channels that support IEPE ZonicBook/618E 1 through 8 640e, 640u 1 through 4 650e, 650u 1 through 4 652u 1 through 10 655u 1 through 10

The bias current is sou rced through the cen te r c onductor of the input c hannel BNC connector and returns to the acqu isition device [e.g., ZonicBook/61 8E, 640, 650, 652, 655 or WBK18] via the BNC’s outer condu ctor

The current source featu r es a n operating compliance of 24V and is protected in regard to both shor t-circuit and overvoltage. Oper a ting compliance refers to the highest voltage that can be applied without change of the current source value. In the absence of a transducer, the cur rent source will output an open circuit voltage of 30V. F or applications that do n ot r e quire bias, the c urrent source can be disconnected from the input by un-checking IEPE in the Input Channels tab on a per-channel basis.

When the IEPE cell is checked for a channel, the current source is enabled, and the input voltage is c ontinuously m onitored with level detection circuitr y. Recognition of a voltage grea ter than 25V (transducer open) or less than 1V (transducer s hort) triggers a transducer fault con d ition for the affected c hannel. This error is communicated to the user via a front panel LED a nd is also available through a software status request at the end of an acquis ition. When recognized, an error is latched until the commencem e nt of a new acquisition . Consequently , even intermittent faults are detec te d and communicated . Detection of a fault does not, however , alter the acquisition process or it s d a ta .

When the IEPE function is not available to a channel a dash appears in the IEPE column for the associated channel.

eZ-Analyst 889691 Edit Menu 4-17

Page 50

TEDS Info

When IEPE is selected you have the option to use TEDS. You ca n then hold down the <Ctrl> key and click the mouse button to bring up TEDS in formation as indicated in the f ollowing screen image.

Example of TEDS Information

Note: the Preferences Tab contains a checkbox with the associated text: “Check for TEDS sensors on Dynamic Input Channels.”

If checked, every time eZ-Analyst is started, every channel [on each connected WBK18 or ZonicBook main channel] is scanned for the presence of a TEDS compliant accelerometer. This scanning adds time to the eZ-Analyst startup. See Tip.

TIP: If your acquisition s ystem doesn't have [or is not making us e of] TEDS accelerometers, then leave the ass ocia ted c heckbox in the Prefer ences Tab “unchecked. ” Th is will allow for a faster startup of eZ-Analyst.

Coupling AC or DC couplin g can be set on an indiv idual channel basis fr om the Input

Channels tab. Coupling is available for analog channels (CH1 through CH8) and for compatible expansion c hannels [e.g., from a WBK18]. AC Coupling can be set to a high pass filter value of 0.1 Hz or 1 Hz. The value is selected in the Edit Menu’s Analyzer Tab (s ee page 4-4). Note that when DC Coupling is selec ted the high pass filter is bypassed.

When the Coupling function is not a vailable to a channel, or not used by a channel, a dash appears in that channel’s Coupling column.

4-18 Edit Menu 889691 eZ-Analyst

Page 51

Pct OvrRng

EU Mode* dB EU Ref: is applied to displayed data when the Y-axis scale is set to dB.

mV/EU* sets the scaling fac tor of millivolts to En gineering Units. EU Offset* Units Enter the measurement units you will be using. Location This is a sim ple n umbering system. The channel number is the default value for

Coord This is the axial direction of the transdu c e r c onnected to the channel. Make your

Input Type

The percent of Full-Scale Volta ge ( FS) that should be recorded a s ov er r a nge. When set to a value of 0, the overr a nge feature is disabled.

E(ngineering) U(nits) : Select EU or Volt.

This is valid only for frequency doma in data.

Note: Data exported from eZ-Ana lyst is always scaled to Engineering Units.

This is regardless as to whether EU or V is selected.

sets the offset fa ctor that is to be appl ied to the Engineering Units.

location. However, you can highlight a cell and type a dif ferent location n umber. When you press the Enter key , the value is accepted.

selection on the popup men u that appears after clic king in the applicable cell.

This is the type of instrument attached to the channel. M enu selections include: Acceleration, Velocity, Dis pla cement, Force, Pressure, Stress, Strain, General, and Tach (Tachometer). Input Type refers to the Analog I nput channel type for CH1 through CH8. Note: Tachometer properties for the eight Analog Input

channels (CH1 through CH8) are set in the FFT Setup tab. Refer to that se c tion of the docume nt for additional inform ation.

ZonicBook/618E users - do not confuse an analog input channe l (CH1

through CH8) with a T ACH Channel inpu t (T1, T2, T3, or T4). The later is discussed in the following secti on.

Default Tach

If “Default Ta c h” is selected from the tach channel combo-box [next to the Order Track button] on the toolbar (see following figure), then the tach channel shown in this column is the one that will be used for the associated analog input channel, when calculating orders.

*Note: When in “Playback Mode” you can temporarily change EU Mode, mV/EU and

EU Offset to customize your playback of data. The new settings will be applied to your playback session; however, upon closing eZ-Analyst the settings will default to those originally configured at the time the data was recorded.

Section of Configuration

Input Channels Tab

eZ-Analyst 897990 Edi t Menu 4-19

Page 52

Configuring Tach Channels (T1, T2, T3, and T4)

Tachometer Section of the Input Channels Tab, 1st 9 Columns

No. This column lists the available Tach channels, e.g., T1, T2. Do not confuse these

channels with analog input channels which can also be used for tachometer input.

Active Available Tach channels are initially active. To set unused channels to OFF,

remove the check from the associate d “Active” checkb ox.

Label This should be a meaningfu l name. Highlight a cell before typing a la bel. W hen

you press the <Enter> key, the <Apply> button, or the <OK> button the lab el is accepted.

Ref / Resp There are two types of channels, Reference and Response. All channels are

initialized as Res p onse channels. If you are using a force channel, then (1) highlight that channel’s Response/Reference cell, and (2) select Reference on the res ulting popup menu.

Coupling Used to select AC or DC Coupling. For tachometer applications AC Coupling is

almost always preferred. DC Coupling is available to allow viewing of the DC signal, but is of no practical use to tachometer related triggers.

Tach Mode

Pulse / Rev

Trig Level Trig Slope

Used to select one of three available modes: Voltage, C ounter, or Period.

If any ZonicBook Tach channel is set f or P eriod Mode measurements, all ZonicBook Tach cha nnels may be out of phase in relation to t he ZonicBook Dynamic channels. If a dditional in-phase Tach channels are needed, you must use Dynamic chan nels configured as Ta ch channels.

Displays the number of pu lses per r evolution.

Specifies the puls e le vel that the RPM a lg or ithm considers valid. Specifies wheth e r c ounting is Positive or Negative. Posit ive means that the

trigger will be active on rising signa l levels. Negative me a ns that the trigger will be active on falling s ignal levels.

RPM Multiplier

This column is us e d for entering a value to convert RPM into other units, e. g., Miles per Hour, Re volutions Per S ec ond, or HZ. The desired con version factor is entered as a multiplier. To divide, enter an appropriate decimal. For example, divide by 2 you would enter a va lue of 0.5.

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Edge Detect

Delay Time

Tachometer Section of the Input Channels Tab, 2nd 5 Columns

Edge Detect – Edg e D etect is short for “ Tach Pulse Edge Detection . ” The

term pertains to detecting the risin g or falling edge of a tachometer pulse using either an “Immediate” or “Delay ed” mode.

Immediate Edge Detection (“Before Stable”) – “Imm ediate” is one of two

Edge Detect modes. The term is s ynonymous with “Before Stable.” If “Immediate” edge detectio n is selected a tach pulse will be recognized on any instantaneous m e a surement that meets the trigger level criteria. In this s e tup the “Delay Valu e ” is the amount of time before the next ta ch pulse can be recognized.

Delayed Edge Detection (“After Stable”) – “Delayed” is one of two Edge

Detect modes. Th e te r m is synonymous with “After Stable.” If “Delayed” edge detection is selected a tach pulse will be recognized when the measurement meets the trigger cr iteria for the spe c ified duration. In this setup the “D ela y Value” defines the length of time tha t the trigger criteria m ust be stable before the tach pulse will be recogniz ed. If a keyway is being used as a tach trigger y ou must calculate the minimum pulse width, based on the maximum RPM rate expected.

One of several time settings betw een 500 ns and 25.5 ms. The delay time is used in conjunc tion with edge detect an d is used to optimize noise r e jection.

Default Tach

Max RPM

and

Max Orders

If “Default Tach” is selected from the tach channel combo-box [next to the Order Track button] on the toolbar (following figure), then the tach channel shown in this column is th e one that will be used w hen calculating orders.

Max RPM and Max Orders are used to limit the X axes scale range when calculating an Order Tracking display in the main function view window. Max RPM and Max Orders represent the practical limits of the Order Track disp la y that are constrained by the settings of Analysis frequency, Spectral lines, and the Nyquist Factor. These two va lues interact. Chang ing one will cause the other to change.

eZ-Analyst 889691 Edit Menu 4-21

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To make an optimal noise rejection setting in software . . .

1. Setup the input for Voltage Mode (Select AC or DC Coupling).

2. Take a measurement.

3. View the Tach Signal on a TimeWaveform plot.

4. Set the Trigger Slope [Trig Slope] to Positive (POS) or Negative (NEG).

5. Set the Trigger Level [Trig Level] to a value between 50 and 75 % of the maximum excursion.

6. Set Edge Detect to “Immediate” or “Delayed.” An illustrated example making use of a

500 ns delay follows shortly.

You may need to experiment with Edge Detect settings to determine whether “Immediate” or “Delayed” works best for your application. Optimum settings will vary, depending upon the noise present on the Tach input.

7. Set the Delay Time to a pre-set value between 500 ns and 25.5 ms. To have no delay time select

“none.”

The debounce time should initially be set as low as possible, i.e., to 500 ns or to “none.”

If the velocity readings are jumping around, that is, they are either too high [as if there was an extra tach pulse] or too low [as if there was a missing pulse] increase the debounce value to higher than 500 ns. Some experimentation is to be expected.

Increasing the debounce value too high will reject the tachometer pulse altogether, particularly at high RPM.

Do not set the debounce value to higher than o ne-half of the minimum tach pulse period. The minimum tac h pulse period is that which e xists during the highest RPM.

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The following diagrams show t ypical tach pulses and appropriate comparator threshold trigger settings.

Typical Tach Pulses and Appropriate Threshold Settings

eZ-Analyst 889691 Edit Menu 4-23

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Synopsis of Tach Modes

When you connect a tach sensor to a tachometer designated connector, such as the ZonicBook/618E’s TACH BNCs (T1, T2, T3, or T4) you can select one of the followin g three modes: Counter, Period, or Voltage. If you connect a tac hometer sensor to a direct Analog Signal Input ch a nnel (CH1 through CH8) then the tachometer s ig nal will only be accepted in the Voltage Mode.

If tachometer triggers will occu r a t a ra t e gr eater than or equal t o the “scan rate divide d by 10” then the Period Mo de must be used.

Counter Mode

Use Counter Mode when Pulses per Revolution are needed.

Counter Mode can be used for phase shift observance.

Period Mode

Counter Mode generates a Pulse of Amplitude “+1” for each tach trigger. The counter mode can be u s ed when the number of pulses is less than the scan rate divided by ten (< scan rate / 10).

Once you have established the phase relationship of a machine running near optimum, the observance of phase shifts can be used to signal the development of a mechanical problem.

The period is the time from the risin g edge of one pulse to the rising edge of the next pulse, or the time from the falling edge of one pulse to the fa llin g edge of the next pulse.

Use Period Mode when multiple pulses are involved, such as from gear teeth.

Period Mode cannot be used for phase shift observance.

If any ZonicBook Tach channel is set f or P eriod Mode measurements, all ZonicBook Tach cha nnels may be out of phase in relation to t he ZonicBook Dynamic channels. If a dditional in-phase Tach channels are needed, you must use Dynamic chan nels configured as Ta ch channels.

The Period Mode is used for Tac hometer inputs which exhibit multiple pulses per revolution. T he mode provides accurate overall RPM without sacrificing scan rate. Phase measurements are not possible when using period mode.

Note: 60 seconds divided by the period [in seconds ]

equals RPM.

Voltage Mode

Voltage Mode is use d for Tachometer inp uts to view actual input volta ge s from the Tach Sensor. Voltage mode is useful for locating an ideal T a c h Trigger Voltage setting. An ideal trigger voltage is one that is in a clean region of a leading edge. Note that V ol ta ge M ode cannot be used for Phase measu remen ts betw een Analog Inputs and Tachometer Inputs.

Use Voltage Mode when you need to determine a trigger voltage.

If you connect a ta c hometer sensor to one of the 8 Analog Signal I nput channels (CH1 through CH8) instead of a TACH channel, then the tachometer s ignal will only be accepted in the Voltage Mode.

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Edit Menu > Configuration > FFT Setup Tab

FFT Setup Tab

Edit Menu > Configuration > FFT Setup Tab: FFT Window Functions / Response Channels

The FFT (Response) window is a time-domain, weighting win d ow. A response window is usually applied to data to reduce FFT leakage errors. FFT theory assumes that the signal being analyzed is pe r iodic in the data a cquisition block. Wh e n this is not the case, en er g y from a signal at a specified frequency can leak into nearby spectral bins causing spectral amplitude inacc uracies. Applying a windowing function controls, but doesn’t completely eliminate, the error by multiplyin g e a ch data frame by a suitable time-domain weighting window. This calculation reduces the amplitude/magnitude of the data near the ends of each data frame prior to perform in g the FFT and forces the data to be nearly periodic in the window, thus reducing leakage error s. Response win dow options are as f ollows:

None: Hanning:

FlatTop:

eZ-Analyst 889691 Edit Menu 4-25

FFT Window Functions, Response Channels Pull-down List

No weighting window is applied. The Hanning win dow is typically used to a nalyze continuous signals. It off er s

a reasonable trade-off of frequency accuracy versus amplitude accuracy. Compared to the v er y similar 4-term “Ma x Flat Top,” this window also has a

very low peak am plitude error, and its frequency resolution is somewha t better. Its side lobes are con s idera bly higher. Its effective noise ba ndwidth is still almost twice that of the Hanning window, there fore this window is us ed mainly to measure accurate peak amplitudes of discrete spectral components that are known to be separated by s everal spectral lines.

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Blackman-

block length is not sufficient to captu r e a ll of the naturally occurring respon s e.

Harris:

Exponential:

This window function was designed to provide the min imum side lobe level of any three-term window. Compared with the v er y similar Hanning window, it has a slightly w ide r m a in lobe but much better d ynamic range. This window has the smallest 60 dB bandw idth of a ny window listed. The Bla ckman-Harris window may be preferred over the Hanning for measurements r equiring better dynamic range.

An exponential weighting window is equal to 1.0 at the beginning of the block and decays exponentially to a smaller value at the en d of the block. Exponential is u s e d only with transient data that is captu r ed with pre-trigger to assure that the initial values in all data channels a re v e r y close to zero. Exponential can be used with all transient excitation methods in order t o force the signals to decay close to zero, ( See Response Decay Perc ent,) even if the

If the data decays naturally to a low a mplitude within the block, so that leakage is not significant, exponential windowing can improve the signal-tonoise ratio by giving reduced weight to the very low-amplitude data at the end of the block.

Decay % :

Decay Percent is used when a n Ex pon ential Window is applied to the Response Channel. It is the weightin g factor present a t the last block value. For example, a decay of 5% means that the weighting factor at the beginning of block is 100% and th at the weighting fa c tor of the last block is 5%. In other words, the w eighting factor dropped (decayed) to 5% through the length of block.

Edit Menu > Configuration > FFT Setup Tab: FFT Window Functions / Reference Channels

The FFT Referen c e W indow is applied to the output of a transducer to avoid collectin g extraneous signals caused by an excitation device, such as an impulse hammer. Possible selections are: Response, Rectangular, and Cosine Taper.

When Rectangular is selected, specify the Start(%) and End(%) of the rectangle as a percentage of the Frame Period.

When Cosine Taper is selected, specify the Start(%), End(%), and Edge(%) the Cosine Taper as a percentage of the Fr a m e P er iod.

FFT Window Functi ons, Refere nc e Channels Pull-Down List

Start (%): The percent of the Frame Period at which the Rectangular and

Cosine Taper Win d owing functions s tart.

Stop (%): Th e per c ent of the Frame Period at which the R ec ta ngular and

Cosine Taper Windowing func tions stop.

Edge (%): This is the percent of the Frame Period during w hich the Cosine Taper

Windowing function tapers up and down.

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Edit Menu > Configuration > FFT Setup Tab: Integration Panel / Unit Conversion

Integration Pane l – 2 Views

The left-hand view is with the scrollbar up, the right-hand view is with the scrollbar down.

Integration:

Provides the mean s to select integration, for example , g’s-ips-mils or g’s-ips-in. Several other poss ibilities exist, as can be seen in the above images of the Integration Panel.

Edit Menu > Configuration > FFT Setup Tab: Integration Panel / HPF Int1 & Int2

The High Pass Filter Integra tion 1 ( HPF Int1) and Integration 2 (H P F Int2) are used to remove the low frequenc y effects of integration. All data points that exist below the s pecified value are set to zero. Whe n “Hz” is selected for th e Acquisition An a lysis Frequency v ia radio button on the Analyzer Tab, “Hz” is seen as the units, when “CPM” is selected for the Acquisition Analysis Frequency via radio button on the Analyzer Tab, “CPM” appears as the HPF units.

FFT Integration Pa nel

HPF Int1 (Hz): Enter a value for the cutoff amount for the first inte gr ation.

HPF Int2 (Hz): Enter a value for the cutoff amount for the second in tegra tion.

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Edit Menu > Configuration > FFT Setup Tab: Tach Setup – Analog Channels

The “Input Type” for Analog Input channels (CH1 through CH8) can be set to “Tach” from the Input Channels Tab via the “Input Type” column. Once the analog channels have been selected for Tach further configuration mus t b e m ade from the FFT Ta b (f ollowing figure).

Do not confuse the Ta c h Setup of Analog Cha nnels (CH1 through CH8) with T a c h Channels T1, T2, T 3, a nd T4. The later are configur ed from the Input Cha nnels Tab.

Reference Note: For information pertaining to tachomet er inputs

T1, T2, T3, and T4, refer to the Input Channels Tab section of this chapter.

Analog Channels (CH1 through CH8) can be set to have an input type of “Tach” from the Input Channels Tab, as indicated in the right-hand figure above.

Tach Setup for Anal og Channels is perform e d within the FFT T a b

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Tach Setup – Analog Channels Section of FFT T a b

Properties for Analog Channels (CH1 through CH8) when set to “Tach” for Input Type

Pulse/Rev Trig Level

(Trigger Level)

Trig Slope

(Trigger Slope)

RPM Multiplier

Max RPM and Max Orders

Displays the number of pulses per revolution. Specifies the pulse level that the RPM algorithm considers valid.

Specifies whether counting is Positive or Negative. Positive means that the trigger will be active on rising signal levels. Negative means that the trigger will be active on falling signal levels.

Used to enter an RPM multiplier value. This is useful if your tachometer is measuring an RPM that is proportional to another value of interest, such as in a gear train. For example, you want to see the RPM for shaft “X” which is known to turn at 2.5 times the RPM of gear “Z;” but it is impractical for a tachometer to measure the RPM of the shaft by any direct means. In this cas e, we woul d enter a multiplier of 2.5 for the gear’s RPM to obtain the shaft’s RPM.

Used for analog input channels that have been configured as tach channels. Max RPM and Max Orders are used to limit the X axes scale range when calculating an Order Tracking display in the main function view window. Max RPM and Max Orders represent the practical limits of the Order Track display that are constrained by the settings of Analyses frequency, Spectral lines, and the Nyquist Factor. These two values interact. Changing one will cause the other to change.

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Edit Menu > Configuration > FFT Setup Tab: Bank Control (Modal Locations) Panel

This panel relates to the Modal Locati ons window, which is a ccessed from eZ-Analyst Window’s pull-dow n menu. The Bank Control (Modal Locati ons) Control Pan el contains one check box, two r adio buttons, and a loc a tion increment f ie ld. Descriptions of e a c h follow.

Bank Control (Moda l Locations)Pa nel

Note: This option is only effective when the averaging mode is used. Auto Bank Increase

with Automatic Saving Data:

A Bank is a set of response channels. You can have eZ-Analyst increment the banks automatically after each measurement, or you can manually increment the banks. The number of active channels is used as the skip factor for bank switching.

If the Auto Bank Increase checkbox is checked, then the bank is automatically incremented, but only when the automatic saving data option is selected at Setup Export Function Data menu.

Response Incre ase: If the Response Increase radio-button is selected, the referenc e

channel’s location doesn’t change. The response’s location(s) are increased [or decreased] for next available location numbers.

Reference Increase: If the Reference Increase radio-button is selected, the response

channel’s location doesn’t change. The reference’s location(s) are increased [or decreased] for next available location numbers.

Location Increme n t: Indicates the number by which eZ-Analyst is to increment the

response or reference loca tion a fter each measurement.

Note: Decreasing location numbers are only ava ila b le with the manua l ba nk <Down>

button on the Modal Locations win dow. Modal Locations is a ccessed from the Windows pull-down menu.

A Note Abou t Channel Pairs

A Channel Pair is a Reference channel and a Response channel that are used to display a dualchannel function, such as an FRF (Frequency Response Function). Channel Pairs are automatically def in ed when a user selects "Reference" channel type for an input channel. For example, if Channels 1 and 2 w er e defined as reference chan nels, then all response channels would paired to those channels. Thus,

1,1 2,1 3,1 4,1 5,1 6,1 7,1 8,1 and 1,2 2,2 3,2 4,2 5,2 6,2 7,2 8,2

To export all of th e data for the Channel Pairs, select the “All Ch. Pairs” radio bu tton in the

Export Function Data window (see chapter 3 for window details).

Edit Menu > Configuration > FFT Setup Tab: Low Frequency Cutoff

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Low Frequency Cutoff Panel

The Low Frequency Cutoff panel can be used to change frequency-based displays.

Example: If you wanted to remove frequencies below 10 Hz, you would enter "10" in the numeric field. In the Function View display window, all frequencies below 10 Hz would be set to a value of zero.

Entering a value of "0" in the numeric field disables Low Frequency Cutoff. This means all frequencies will be displayed.

Edit Menu > Configuration > FFT Setup Tab: dB Voltage Reference Panel

dB Voltage Reference is only valid for frequency domain data. The reference is applied to all channels of displayed data when the Y-axis scale is s e t to dB and EU/Volt mode set to Volt. The panel [follow ing figure] is design ed s uch that a specified voltage can be a s signed to a specified dB value.

dB Voltage Reference Panel

Reference Note: The dB EU Reference Volt column is located in the Input Channels Tab.

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Edit Menu > Configuration > Recording Setup Tab

Recording Setup Ta b

Edit Menu > Configuration > Recording Setup Tab: Stop Recording Panel

Provide a means of setting the follow ing parameters t hat pertain directly to stop recording :

Recording Durati on sets a “time-out” which the recording event is not to exceed. If an acquisition h a s been triggered, the measuremen t w ill run until either (a) the amplitude-based Enable Stop Trigger Condition is met, or (b) the Recor ding Duration is met, whichever occurs first. When the R ecording Duration v a lue is met, the recording event is aborted.

There is a 2 gigabyte file size limit a t ion that needs to be considered when specifyi n g the recording duration [for a given c ha nnel number and associated analysis frequency] .

Enable Stop Trigger – if the checkbox is checked, amplitude-based data can be set as a stop condition for the recording. The following options are provided.

Amplitude-Based

Data Types

Delay (sec) – this fu nction is used to include [with the record ing] data that follows the stop trigger event by the set number of s ec onds, as specified by the delay.

Peak Time >= Peak Time <

Spectrum >= Spectrum <

at specified frequency

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Maximum Duratio n L imit Terminating a M easurement

Understanding Tota l Measured Dat a

In this figure, the Start Recording’s P r e Acq-Trigger data and th e S top R ec ording’s Delay data are both saved as part of the total measured data.

Edit Menu > Configuration > Recording Setup Tab: Scheduled Recording Panel

The Scheduled Recording pa nel includes a checkbox to enable the “scheduled recording” function. It also includes three text fields (see following figure) . The panel provides a means of setting time cond itions for starting a nd stopping a record ing. dT is the delay time in seconds.

Scheduled Rec or ding Panel

When using Scheduled Recording, y ou need to set up the re c ording options for automatic file creation. This i s done in the Recordi ng S etup Tab’s “F ile Name Options” pan e l, discussed below.

Edit Menu > Configuration > Recording Setup Tab: File Name Options

File Name Options Panel

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When using the Scheduled Recording feature the follow ing steps should be taken to ensur e that each file will be a utomatically named by the program.

From the File Name Options pa nel, at the upper left of the Recording Setup Tab, verify that the following is tru e. Make changes if needed.

• File Name Prompt – Not Checked

• Measurement Prompt – Not Checked

• Auto Increa se – Checked

• Date/Time – Select the “Date/Time” radio-button if you want the Filenames to

automatically increase by a Date/Time convention, otherwise selec t “Number.”

• Number – Select the “Number” radio-button if you want the Filenames to

automatically increase by a nu m e r ic al sequence (1, 2, 3, ….N) convention, otherwise select “Date/Time.”

An Example of Filename Auto-Incrementing by Number

Edit Menu > Configuration > Recording Setup Tab: Comments Panel

The comments panel can be used to enter a variety of inform a tion regarding the r ecording. For example, you m ay want to include the en vironmental conditions that existe d a t the time of the recording, the phase of the proj ect, or a problem that is being investigated. Note that the comments are saved as part of the data file.

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Edit Menu > Configuration > Block Rejection Tab

The Block Rejec tion Tab exists to allow the software (or u ser) to reject blocks of data that result from ham m er d ouble strikes, ov er loads, or simply bec a use the data block “doesn’t look right.” There are three block rejection modes: Double Hammer protects measu r ements against double hammering . Overload protects the measurem ent by automatically r e je c ting overloaded data, and Manual allows you to inspect a mea s urement and optionally reject it. You can select any or all of the rejecti on modes. Also see: Considerations Regarding Double Hammer Rejection, page 4-37.

Note: The Block Rejection panel is only active when in “Measurement Mode.”

When in “Playba c k” mode the panel fi elds will be grayed-out.

Block Rejection Tab

Block rejection looks at the acceptabl e p a r ameters for a block, and rejects blo c ks that do not meet those parameters.

Double Hammer:

Overload: An overload is any input signal tha t r eaches or exceeds the specified input Full

Manual: This option allows you to review each block of data before a c q uiring the next

A double hammer occurs when a signal goes outside of the acceptable ra nge that is set up in the Hammer Rejection section. Click in the Double Hammer box to turn the Double Hammer option O N a nd OFF. When the box is checked, th e option is ON.

Scale range. C lic k in the Overload box to tu r n the Overload Rejec tion option ON and OFF. When the box is checked, the option is ON.

block. When manual rejection is selected, a <Reject?> button is activated in the main window . At the end of each averag e, if you want to reject that measurement, c lick on the <Reject?> button. eZ-Analyst will then reject the current frame of data. The data a nd average counter will go back to the pr evious measurement. Click in the Manual box to turn the Manual option ON or OFF. When the box is checked, the option is O N .

Block Rejection is used in conjuncti on with Capturing T ransient Data (Input Channel triggering) and Averaging. These topics a re discussed on pages 410 and 4-12, respectively.

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Edit Menu > Configuration > Block Rejection Tab: Hammer Rejection Panel

This panel is used to define the a c c epta ble range for a hammer sign a l. Any s ignal outside of the defined range is detected a s a double hammer. The acceptable range will appear as a rectangle whose boundaries are defined by high and low limits f or the blocksize, and by high and low limits for sc a le . Respectively, these are x- and y- axis limits.

X-axis Limits, % of blocksize: Used to set a Low point an d a High point along th e x-axis, for which the ha mmer impact must occu r to be ac c eptable. An example setting is 5% to 15% (of blocksize).

Y-axis Limits, % of FS (Full Scale): Used to set a Low point and a High point along the yaxis, for which the hammer impact mus t oc c ur to be acceptable. An example is –5.000 to + 5.000 (% of Full Scale).

Considerations Regarding Double Hammer Rejection

There are three major interrelated c om ponents to con s ider when setting up a double-hammer rejection condition. These are:

• Tri gger Mode and Delay

• Forc e Window

• Dou ble Hammer Region

A trigger is used to ensure time synchronous measurements across all the active channels. As indicated in the Trigger Panel section of th is document (beginn ing on page 4-5), a pre-

trigger indicates that data captured before a trigger event [the amount of which is s pec if ied by the delay] will be prefixed to th e da ta following the tr ig ger event. Also, a trigger delay [in reference to the Start Trigger Con dition] indicates that a specified a m ount of data after the start trigger [the amount of which is specified by the delay] will be skipped (ignored) before a block of data is captured.

Double hammer reje c t is only meaningful with the pre-trigger spec if i ed. Double

hammer rejection protects the measurement from a bad ha m m er in g. It is desirable to set the pre-trigger to fall within the hammer region, since it is a common

practice to set the trigger channel to an impact channel.

Example

In this example, a te s t e ngineer is looking for a trigger event that oc c urs somewhere after 10% of the data block, but before 15% of the block. Therefore:

(1) Pre-Trigger is set for 10% De l a y, using the Trigger Panel (on the Analyzer Tab). (2) A Rectangular F orc e Window is selected and set for a Start poin t of 9% and a Stop

point of 15%. This is done in the FF T Setup Tab’s FFT Window Fun c tions Panel. Page 4-26 contains add itional infor mation.

Selecting a Re c t a ngular Force

Window and Setti ng P oints

for 9% and 15%

Selected and set in the FFT Setu p T a b.

A Double Hammer Event

When impact testin g we want to make sure that a double hamme r doe s not occur. Through trial and error we may start by s ettin g the Double Hammer range at 12% a nd 14%, or 11% and 13% of the block. Typically this ra nge is fine tuned using sa m ple a c quisitions prior to starting a real tes t.

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Edit Menu > Configuration > Octave Setup Tab

Octave Setup Tab

Edit Menu > Configuration > Octa ve Setu p T ab: Processing Mode Panel

Single Band: Single Band is th e c onventional mode, a nd as the name suggests,

is used for single band processing. When Single Band is selected, lower and upper limits can be s et f or th e High Band Range only.

Dual Band (Buffered Measurement):

Dual Band, also referred to a s “buffered measurement,” is provided for octave band processing such that spectral lines [at settings of 6400 and sma ller] can cover a larger frequency range. The Dual Band mode uses buffer memory when processing the lower frequency range.

Dual band uses 32 block sizes. This makes it possible for e ZAnalyst to simultaneously process 32 “time segments ” in the lower frequency ran ge, as indicated in the following figure.

4-38 Edit Menu 889691 eZ-Analyst

1 Block Processed for High Ban d

32 Blocks Processed f or Low Band

Page 70

When eZ-Analyst was set with a limit of 6400 spectr a l lines, dual band processing offered the following benefits:

• A wider range of octave band data

with no increas e in block size.

• A much wider range of data, in

comparison to the d a ta from the Single Band mode.

• The use of buffered data means that

High Band and Low Band data can be captured simultaneously.

• When compared to Single Band, the

Dual Band processing mode produ c es more stable, precise data, a t a low er range of frequency.

eZ-Analyst versions 5 and higher have a spectral line li mit of 25600. This large r number of spectra l lines allows cov erage of the same fre quency range usi ng single band mode.

Beginning with e Z -Analyst version 5.1.45, th e selection for dual ba nd octave is grayed-out. This is because single band mode s hould be used with the larger number of spectra l lines.

If you have configura tions that use the dual band octave feature, then eZ-Analyst versions 5.1.45 a nd higher will continue to load and run those configurations until

you re-save the configuration in si ngle band mode.

Edit Menu > Configuration > Octa ve Setu p T ab: Filter Panel

Weighting: Used to select no filter or one of three to obtain a d B to frequency contour that

approximates that of the human ear. The contours (A, B, and C) match human hearing at different sound intensities.

A Weighting: filters out more bass than do the B and C weights. The A weight is used to eliminate inaudible sounds that occur at low frequencies.

B Weighting: used to approximate the ear for medium loud sounds. C Weighting: used to approximate the ear at very high sound lev els .

Filter: Provides the means to selec t Analog Filter or Digital Filter.

Edit Menu > Configuration > Octa ve Setu p T ab: Bar Type Panel

Line: Selecting “Lin e” sets the Octave Plot t o a p pe a r in line format. Solid: Selecting “Solid” sets the Octave Plot to appear filled-in solid, as

opposed to a line plo t.

When you want to mov e cursors on octave plots it is best to use the mouse and drag-and-drop acti on, instead of using the frame annotation me thod.

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Edit Menu > Configuration > Preferences Tab

startup of eZ-Analyst.

The Preferences tab includes two panels: (a) T.E.D.S and (b) Measurement Mode.

T.E.D.S. Panel

If the TEDS checkbox is checked: every time eZ-Analyst is started, every channel [on each connected WBK18 or ZonicBook main channel] will be scanned for the presence of a TEDS compliant accelerometer. Note that this “TEDS scanning” adds time to the eZ-Analyst startup. See the following tip.

Edit > Configuration > Preferences Tab – T.E.D.S. Panel

T.E.D.S. Panel

TIP: If your acquisition system doesn't have [or is not making use of] TEDS accelerometers, then leave the associated checkbox in the Preferences Tab “unchecked.” This will allow for a faster

TEDS Info When IEPE is selected in the Edit Menu’s “Input Channels” tab you have the o ption to use TEDS. Y ou can

then hold down the <Ctrl> key and click the mous e button to bring up T EDS informati on as indica t ed in the following screen image.

Example of TEDS Information

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Measurement Mode Panel

This feature, when enabled (checked) reduces the chances of accidentally overwriting your existing Hardware and Conf iguratio n Setu p file .

Edit > Configuration > Preferences Tab – Measurement Mode Panel

Measurement Mode Panel

In eZ-Analyst the same Hardware and Configuration Setups [that are used to Record data to disk in Measurement Mode] are also later used to read and analyze recorded data in Playback Mode.

After data has been recorded to disk, subsequent critical Configuration changes (such as changing the number or selection of enabled cha nnels, or cha nging the A nalyzer analysis frequency or nyquist settings), if saved to disk, would prevent eZ-Analyst from correctly interpreting data that was previously recorded using that Setup. Reversing the changes made to the Hardware Setup could restore the ability to view the previously recorded data, but only if ALL of the changes were returned to their original settings.

The Measurement Mode preferences checkbox helps reduce the chance of accidentally overwriting your existing Hardware and Configuration Setup file. The checkbox setting determines whether or not you will be prompted to save-to-disk the current Measurement Mode Setup when the program is either (a) closed while in Measurement Mode, or (b) the selection is made to switch from Measurement to Playback Mode.

Unchecked - If the c heckbox is unchecked, you will not be asked to save the Hardware Setup, nor will the Measurement Mode Hardware Setup (along with any changes made t o it) be saved to disk when the program is closed, or the mode switch is made. If you are switching from Measurement to Playback Mode, the Configuration Setup is restored by readi ng the Setup fr om the disk.

Checked - If the checkbox is checked, and the program is either closed while in Measurement Mode, or the selection is made to switch from Measurement to Playback Mode, you will be asked if you want to save the Measurement Mode Hardware and Configuration Setup to disk.

You can respond to the prompt by clicking: Yes, No, or Cancel, with the following results:

o Yes - d i s plays the Sa ve Analyzer Setup File dialog, allowing you to select an existing setup file

to overwrite, or enter a new filename to create a copy of the existing configuration.

o No - accepts the current action without saving the Hardware and Configuration Setup to disk. o Cancel - aborts the switching of Mode or the program shutdown.

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From the Save Analyzer Setup File window, i f you press Cancel, you will abort the Mode switch operation, or abort the program shutdown.

However, if you press Save, one of three things will happen:

(a) If you entered a new filename [that does not already exist] the Hardware and Configuration Setup

will be saved to disk, along with a Plot Setup file that represents the current number and layout of display windows. In addition, the switching of Modes [or program shutdown] proceeds.

(b) If you entered or selected a pre-existing filename and the Hardware and Configuration Setup file

already exists

[but there is no recorded data present with the same name] you will be asked if you

want to overwrite the existing Setup file.

If you choose Yes, the file will be overwritten and the shutdown [or the switching of the mode] will proceed. If you choose No, you will be returned to the Save Analyzer Setup File dialog box where you can either Cancel the operation or choose a different file name.

already exists

[and there is previously recorded data file present with the same name] you wi ll

be warned. See following figure.

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The warning states that there is a possibility that overwriting the Configuration file may result in the inability to read the previously acquired data. The warning dialog asks, “Do you want to Overwrite the existing Hardware Configuration file and possibly make the existing data unreadable?”

Yes - If you choose Yes, the file will be overwritten and the shutdown or switching of the mode will

proceed.

No - If you choose No, you will be returned to the Save Analyzer Setup File dialog box where you can

either Cancel the operation or choose a different file name.

Reference Note:

The following topics are related to this material on the Measurement Mode panel

o Task Menu > Measurement Mode > Change Task Mode

o Control Menu o File Menu > Exit o File Save / Hardware Setup, Save or Recall

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Edit Menu > Output Channel Setup

ZonicBook/618E and WaveBook Waveform Output …… 4-44 640u and 640e Waveform Output …… 4-46

The Output Channel window can be acces s ed dir ec tly from the Edit pull-down menu [when in the measurement mode]. In all cases, the setup is perf orm ed on a channel-by-channel basis. Configuration changes are accepted as soon as the <Apply> or <OK> button is clicked.

ZonicBook/618E and WaveBook Waveform Output

WARNING

When the Signal Generator is started [in eZ-Analyst] the device that is connected to Source Output will rec eive excitation and could possibly cause injury to personnel. Be aware of which devic e is receiving excitation and post adequate notice to keep indi viduals and physic a l objects clear of the device.

Do not confuse the O u tput Source [excitation source] wi t h s ource level, as the latter term refers to transducer bias current.

The Source Output can be used as a test source for the input channels or as excitation for other system elements, such as the amplifier for a shaker table. All source output parameters are software con tr olled and the actual output signal lea ves the device through a front panel BNC connector.

Note: The Control pull-down menu can be used to turn the Signal Generator “On.”

In regard to ZonicBook/618E WBK18 modules.

In regard to WaveBooks WBK14 or WBK18 expansion units.

For both the ZonicBook/618E and WaveBooks, the Output Channel (Excitation Source) can be for either a contin uously runnin g sin e wave or a swept sine wave.

– Source Output is supported f or dev ic e a nd for attached

– Source Outpu t is only supported when eZ-Analyst detects attached

Output Channel S etup, WaveBook and Z onicBook/618E A pplications

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Sine Mode (Contin uous Mode)

Sine mode refers to a c ontinuously running sine wave of the selected ampli tu de and frequency. To configu r e, select an output amplitude and a sta r t f r equency; then click <OK.> The selected output will begin and c ontinue running until the <Stop> button is c licked or the software application is terminated. End frequency and sweep time do not apply for this mode.

Swept Sine Mode

Swept Sine mode refers to a constant amplitude sine wave that is being swept in frequen cy from a selected start frequency to a selected stop frequenc y over a selected sweep time duration. The fr eq uency sweep char acteristic can be chosen to be linear or logarithmic, and is distributed among 1280 disc rete s teps. The transitions between steps are continuous in ph a s e and in amplitude.

To configure, m a ke selections for the available paramete r s , and then click the <OK> button. Once a sweep is completed, the waveform returns to its start frequency and is swept again and again until stopped by the user or until the software app lic ation is termina ted.

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640u and 640e Waveform Output

eZ-Analyst prov ide s extensive Wavef orm Output functionality when used with an IOtech 640e or 640u Dynamic Signal Analyzer.

When connected to a Dynamic Signal Analyzer 640 Series device [DSA640] the Waveform Output menu selection changes to appear as shown in the figure at the right. Also available is a toolbar button show in the following figure. Either of these will display the W a veform Output Configuration Dialog Box.

The next figure shows the DSA640 Waveform Outpu t Configuration dialog box with the Wave Tab selected. From this selection you can cr e ate simple waveforms of different types, with adju stable Offset, Volta ge level and Duty Cycle (for Square Wave output only).

The Configuration dialog box contains three different areas. A t the top is the Waveform preview window. Below and to the left is the Waveform propert ies a r ea . And to the right is th e Waveform Modifier area.

The Waveform Preview Window displays a REPRESENTATION of what your configured waveform will look like w hen you start the gene r a tor output. This window will faith fully display your configured waveform, but it does have certain restric tions. For example, a continuous wave runs until it is stopped. The preview window display s up to a maximum of 10 seconds of waveform data. Also, high f r e quency waveforms will display aliased, unless you zoom-in to display a smaller segment of the wave; this operation is dis c ussed later.

The Waveform Properties area is were you can change the Type of waveform, its Signal Level, DC Offset, and for Square Waves - Duty Cycle. Changes to these controls can be made while the w a veform output is running. The DSA 640 Waveform Output can genera te a maximum signa l of 4 volts peak (8 volts pk-pk). The interaction between the Off s e t a nd Vpk Level controls will prevent comb inations of setting s that would exceed the 4 volt peak outpu t level.

The Waveform Modifier area is where you can make cha nges that control how your configured waveform will be displayed. Most of the controls in this area are disabled when the generator output is running; with the exception of the (Burs t On Time / Sw eep Time) and Burst Off Time input fields. From the W av e form Modifier area you c a n change your waveform from a continuous wave to a burst wave, or a burst wave tha t repeats. You can also modify the waveform envelope so that it Ramps-Up f rom the quiescen t output level to the selected Vpk output, le vel. Or Ramps-Down (decays) from Vpk to the quiescent level. You can also easily lock the Bu r s t / Sw eep T ime to the Analyzer F r ame Time.

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DSA640 Waveform Output Configuration Dialog Box

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Ramp Up

Wave Tab

Wave Tab Selected

Ramp Down

Select (

)

Cancel (X)

OK (

)

As seen in the preceding screen s hot, several selections are available from within the Wave Tab. In the above example [on the screen image], a sin e w a ve has been modified with a 1.0 second amplitude Ramp-Up.

To add a Waveform R a mp U p or Ramp Down to a waveform:

1) select the appropriate button [Up or Dn]

2) f r om the ramp window click the Select [

3) enter the desired ramp time value (Note - this time is in c luded in the Burst / Sweep On Time If Burst mode or Swept Waveform mode is selected);

4) Clic k the window Note: You can u se the Tab key to cycle the selection high lig ht through all of th e controls. You can also use the Enter Key to select the



How to modify the wav e form Burst On/Swee p Time This section discusses how to modify th e waveform Burst On/Sweep Time s uch that it will automatically track changes to the Analyzer F rame T ime when either the Analysis Frequency or Spectral Line count change.

 [OK] button to accept the change, or th e X button to cancel th e op er ation.

Add Waveform Ramp Up] checkbox (or press the spacebar)

 or X buttons.

Click the Lock I con on the configuration dialog. Then check or uncheck the selec tion to lock wavef orm output to the Frame Time. When waveform output is locked, the Burst On / Sweep Time control is disabled, and the value displayed is the Frame Time.

Locking a Waveform Duration

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Burst Repeat Mode

With Up and Down Ramp E nvelopes Applied

The above screen image shows a wav e form configuration that is set to Burs t Repea t m ode with both an Up and Down ramp envelope appli ed.

The following figure shows that you can zoom into a specific se gm e nt of the waveform to display an unaliased view of the wave. To z oom into the wavefor m s im p ly click and drag th e m ouse over the desired view ing area .

You can continu e to zoom into the wav e form to view smaller and s maller sections of the currently displayed waveform segment.

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Zooming in on a Wav e Segment

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In the next figure we see the popup menu used to restore the waveform display to its un-zoomed s ta te .

A Popup Menu Allow s you to “Un-Zoom” Back to Full-View

Simply right click on the preview win d ow and select Un-Zoom plot to full view from the popup menu.

Swept Wave Tab

This tab allows you to create wa veforms that sweep in frequency. Swept Waves have the same selections for Wave Ty pe Of f s et a nd Vpk signal level as simple wa ves. Additionally a Chirp wave type is available a long with selections for Start

Frequency, Stop Frequency, Sweep Function and Sweep Direction. The Wa vef orm M odif ier a rea

applies the same types of modifications to swept waves as it does for simple waves.

In the figure at the right we can see that eZAnalyst is being c onfigured to generate a 3 volt peak (Vpk) swept sine wave with zero volts DC offset. The sine wave will perform a lin ea r s weep from 10 Hz to 100 Hz over a period of 3 seconds. The output will return to zero volts for 0.5 second; then the sweep will repeat.

Swept waves can em p loy either a Linear or Logarithmic sw e ep function. They also can be swept in one of four directions : (1) Start to End f r eq uency, (2) End to Start frequency, (3) Start to End to Start fr eq uency, or (4) End to Start to End frequenc y. The Chirp wave type is a Sine wave that can not have envelope ramps applied to it.

Swept Wave Tab

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Arbitrary Tab

The Arbitrary Tab allows you to import data from a file, and h ave it played out through the DSA640 Ana log output. This feature allows you to import d a ta from either an e Z-Analyst raw time dom ain data file, or an ASCII text file that has channel data formatted in colum ns,

As indicated in the figure [be low, left], the fir s t time you select the Arbitrary tab, wavef orm pr operties will be empty. To import a file: (1) Press the Browse for file button; (2) select the f ile you want to impor t. The right-hand figure shows the file selection dialog box.

Arbitrary Tab, no Display Selecting a File to Import

Raw Data (.DSC) Files

If you selected an eZ-Analyst raw data file (files in the Import dial og b ox with a .DSC file extension), the Configuration d ia log Arbitrary Tab will appear as shown in the next figure.

Displaying a Waveform for a Raw Data File

The dialog box displa ys information about the contents of the selected data f ile . This includes the Sample Rate the data was a cquired at, the Nu m be r of Samples in the file, a list of Channels in the file, and when a file is selected from th e list, information about the Full Scale Range of the ch an nel and the channel Units.

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Also displayed is information abou t the samples displ ayed in the preview window, and input fields where you

Delimited Start at

Delimiter Import

can change the s c ale and offset of the da ta as it will be played out of the DSA640 Analog Output. Changing the Scale and Offset values allow you to fit a sign a l to the desired output amplitude. Th is can also

be accomplished by right click in g the mouse in the preview window , then select the “Fit Wa veform to full scale” item in the popup menu. To undo changes, you can reset the Scale and Offset values to 1 and 0, or from the popup menu select “Reset plot Scale and Offset”.

When you Import an eZ-Analyst data file, the Output Duration Secs field in the Waveform Modifiers group is automatically s et to a value equal to the number of samples in the file, divided by the sample rate. T his is amount of time the waveform will be played out of the DSA640 Analog Output. In the example show n in the preceding figure, this will be 1.0000 second. If you want, you can change this value to play out the waveform over a different length of tim e . You can also choose t o play out the waveform as a repeated bur st by Checking the Repeat Outpu t and specifying an Off Time value.

ASCII (.TXT) Files

When the opened file has a .TXT file extension, you will be presented with another dia log box. This is where you tell eZ-Analyst how to interp r et the data in the ASCII file. The next figure shows the first step needed for importing an ASCII file.

Row Fixed Width

Text Import Wizard – Step 1 of 2

The first step to importing data from an ASCII file is to indicate if the c hannels are forma tted in (a) fixed width columns padded with s pa c es , or (b) character delimited columns. This is done via the “Digita l d a ta type” radio button. The above figure shows delimited columns. After clicking the radio b utton, select the first row of text th a t has valid chann e l da ta. This allows you to skip over text rows th a t contain non-data content [such as channel headers and acquisition inform a tion]. You can enter the zero bas ed row number directly into the entry box, or click on the desired row in the list box. Note tha t only the first 100 rows of data [in an ASCII file] are dis pla y ed in the list box.

After you have selected Delimited or Fix ed width and the sta r ting row to import, pr ess the Next button to proceed to Step Two.

Types Column

Text Import Wizard – Step 2 of 2 for “Delimited” Format

The above figure shows Step 2 of 2 for importing a delimited the type of delimiter used to separate the c olu m ns of channel data. Tabs and commas are typical delimiters. After specifying the delimiter, s e lect the channel (column) that you w ant to import.

eZ-Analyst 889691 Edit Menu 4-51

column ASCII d ata file. In this box you select

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You can enter the zero based column n umber into the entry b ox, or click on the colu m n header of the desir ed

Fixed column

channel. At this p oint you can press th e Back button to change your selection, or press Finish to start importing data.

The next figure shows Step 2 of 2 for the Fixed width indicate how man y characters wide the channel column is; then you select the channel (column number) to import.

data format. For the fixed width format, you must

width Import column

number

Text Import Wizard – Step 2 of 2 for “Fi x ed Width” Format

After completing these two actions, pr es s th e Finish button.

Importing ASCII data can take severa l seconds. While the data is being imported a pr ogr es s ba r is displayed as indicated in the above figure.

When all of the data has been imported, the dialog display changes. See following figure.

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Data Import in Progress

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Display for Arbitrary Wave, following an ASCII Data Import

The ASCII import dis p la y has the same Scale, Offset, First Samp and Num Samps entry fields seen in the eZ-Analyst raw da ta im p ort display. Additi onally there are en tr y fields for Range Selection and Acquisition Sample Rate. Also displayed are the Maximum and Minimu m d a ta values in the im p orted data.

Unlike eZ-Analyst raw data, ASCII data contains no information about how the data was acquired. Because of this, some inf or mation about the data has to be manually entered by the operator. For example, eZ-Analyst need s to know what the +/ - Full Scale Range was when the data was acquired. The software also needs to know the sample rate that was used to acquire the data.

The Full Scale Range can be either manually enter e d, or automatically set by selectin g the Maximum and Minimum data poin ts im ported from the file.

The Waveform Modifiers operate the same for ASCII data as R aw data. Enter the time v a lue to playback the data, and make the selections needed to make the playbac k r epea t or not.

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Preferences Tab

The Preferences Tab (following figure ) is used to set the operating characteristics of certain waveform output functions.

Preferences Tab

The first control a llows you to adjust th e s ize of the Wavefor m O utput Memory Buf fer. Waveforms are generated in the memory bu ffer and “played-out” through the 640 unit’s Analog Outpu t. As data is playedout, eZ-Analy s t is periodically interr upted to fill the bu ffer with more data to keep the waveform flowing.

The smaller the buf fer the less time it takes to play-out, therefore more interruptions are m a de to k eep

generating waveforms. A larger memory buffer takes longer to play out, so few er interruptions are made to generate waveform.

Computers with lower perf or m a nce processors may need to have the s ize of the memory buffer incr ea sed to redu c e the number of interruptions needed for waveform generation. However, a la r ger mem or y buffer means that changes to the output waveform such as Voltage Le vel, Offset, e tc , will take longer to see the effect of the chan ge; sin c e these changes are applied at the end of the buffer and will n ot be seen until that par t of the buffer is play ed out.

The second contr ol is used to set the trigger point when eZ -A n alyst has been configured to use W aveform Output tr igge ring. The Trigger panel ( s hown at the right) is locat ed in the Analyzer Tab of the eZ-Analyst Edit/Configuration Dialog Box. You ca n set the Trigger point to occur at either the sta r t of the Waveform, or if a Ramp-Up has been applied to the Waveform, a t the end of the Ramp.

Trigger Panel

Located in the Analyzer Tab of the eZ-Analyst Edit/Configuration Dialog Box

Note: Preferences can not be changed when the Waveform Output is running.

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WARNING

When the Signal Generator is started [in eZ-Analyst] the device that is connected to Source Output will rec eive excitation and could possibly cause injury to personne l. Be aware of which device is receiving excitati on a n d post adequate notice t o keep individua ls and physical obj e c t s c lear of the device.

When the Signal Generator Button is pressed eZ-Analyst starts generatin g W a vef orm s a t th e D S A640 Analog Output connector. The Signal Generator Button c hanges from a flat lin e , to a Sine wave Icon to indicate that the ou tput is runnin g .

If the Waveform Configuration Dial og is visible when the Signal Generator is s tarted, the dialog shrinks in size to hide the preview window. Changes ma d e to the output wavef or m while the generator is r unning can not be previewed in the preview w indow (see following figure).

Not Generating Generating Signal

Two Views of the Signal Generatin g Button

When the Signa l Generator is shu t off, either by pressing the Toolbar button, or from the Signal Generator menu selection, the memory buffe r c ontaining the output w aveform must finish playing out before th e output of the DSA640 stops and returns to zero volts. This play-out time is controlled by the Prefe r ence setting (see Preferences Tab, pr ec eding page). While the ge nerator is playing out the data, a status message is displayed in the eZ-Analyst Toolbar indica ting that the gener ator is shutting down (following figu r e ) .

The message is removed when the generator has finished shutting down. At this time the Signal Gen er a tor can be restarted to again gener a te w a veforms on the 640 unit’s Analog Output.

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Edit Menu > Playback Setup Window

Playback Setup Window

Edit Menu > Playback Setup Window: Source Information Panel

Provides general file related information such as filename, file location, the number of active channels, analysis frequency, block size, blocks recorded, and record time. The panel includes a Comments box for user remarks.

Edit Menu > Playback Setup Window: Playback Mode Panel

After you open a recorded file to be played back, you have the option to change the following for viewing purposes:

Spectral Lines: This section of the Playback Mode panel is used to set the number of spectral lines. Note that number of Spectral Lines stated in “Source Information” is the minimum number of lines you can have for the given file’s playback.

Overlap Percent 0 - 99: The percentage of displayed history data that will overlap subsequent data when we step through it. The value can be set to any whole number from 0 to 99, inclusive. To understand the settings:

o 0 – A setting of “0” results in no record overlap. 100% of each record will be displayed;

we step through the history data 1 complete record at a time.

o 50 – With a setting of “50” we see 50% of one data record and 50 % of the subsequent

data record each time we step through the data.

o 99 – At each step-through of the history data, the display will show 99% of the data just

viewed, and 1% of the next available history data. This means that a setting of 99 allows us to step through the history data in 1% increments.

Playback Speed – Select from one of three playback speed options: No Delay, Acquisition Rate, or Delay (mSec)

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Edit Menu > Display Preferences

Display Preferences

Panel Function

Plot Window Colors:

To change a Plot Window display color:

Freq / Order Track Slice:

Plot Colors: The top four buttons in this pane l are used to set colors for tachometer channels. The

Used to edit the colors of Frame Border, Plot Background , Grid Line s , and Curs or s . In addition, the toggle buttons with the “line/as te risk” images are used to obtain a line cursor or a point cursor.

1. Click on the butto n that app lie s to the d i splay c haracteristic, for example, <Plot Background>. A Color Palette will ope n.

2. Selec t a color by clicking on a color square, or by defining a Custom Color.

3. Click <OK>.

4. Repeat the step s 1 throug h 3 for e ach Plot Window color that you want to change.

5. When finis he d , click <OK> in Colors [Color Palette] window.

Applies to Frequency Track Slices and Order Track Slices. The measurement mode will always use the maximum number of records; but for playback modes this panel determines whether:

a) all the data records will be displayed, or b) the maximum stored records will be displayed.

The user can click in the numeric field to change the number of records to be store d .

16 additional buttons are used to set colors for traces or channels. If you want a channel to remain a certain color ensure the channel ra d io button sele c te d. Click on a channel’s color chip to open a color palette. Click on the desired c olor, then click <OK>.

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Panel Function

Cursors: Sets the number of cursors and defines the Foreground, which is the color for

Cursor Movement:

on-plot text, such as cursor values. Sets the cursor’s action. Options are: Pick/Drag, Pick Only, and Drag On ly.

Pick/Drag: Makes use of both the Pick Mode and the Drag Mode. Pick Only: Clicking the left mouse button allows the cursor to move instantaneously

with the band cursor. The chosen cursor moves to the location when the mo use is clicked.

Drag Only: Move the mouse pointer to the cursor location. The pointer will chang e to a “Left and Right Arrow.” Click and drag the cursor to the designated loca tio n.

Peak Search Options:

Peak averages are evaluated by first finding a peak and then averaging the specified number of spectral lines on either side of the peak. This sectio n of the window is used to set the preferenc e s regarding peak search. Options are as follows:

Amplitude Minimum

Peak Width (Spectral Lines)

Sort By

Used to set the Minimum threshold value for peak searching, i.e., the low e s t value of data to be considered for the search. “Minimum is typically set above the extraneous noise level.

Sets the eZ-Analyst to search data, according to a cursor-selected range (band). The band takes into account the Minimum thresho ld value for peak searching, if defined. The default setting for 3 spec tr a l lines. This number specifies the number of data bins used for peak searching. For example, “3” indicates that the peak value will be searched at the current curso r pos ition and the ± 3 adjacent positions.

Select Frequency/Time or Amplitude, as app li c ab le to your peak se arc h.

Pick Peak Options:

Spectral Width (Spectral Lines)

Auto Tracking Selects Cursor-1 and/or Cursor-2 to automatically search for peaks . The

This mode sets the system to search for a peak within the pre-defined (data range) only when the cursor is moved, or clicked. This is a manual method. Compare with Auto-Tracking.

feature makes use of the Spectral Width, for example: “3” indicates that the peak value will be searched at the current cursor posi tio n and the ± 3 adjacent positions. The cursor automatic ally moves to the peak position within the specified range.

Reference Note: Cursor types include single cursor, band cursor, peak cursor, and harmonic cursor.

For detailed inform ation refer to chapter 5, Interac tive Features of the Plot Display Window.

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Toolbar Buttons 5

The following tables can be used to identify buttons an d their functions. An alternative to using the buttons is to “right-click” in a plot display, then use a resulting function menu.

Function Description / Comments

1 Add New FV Window Adds a new Function View.

2 Tile Horizontally Tiles two or more Function Views such that they are longer in the

horizontal direc tion.

3 Tile Vertically Tiles two or more Function Views such that they are longer in the

vertical directi on.

4 Time A single-channel display function. Displays a time domain

waveform of sampled data scaled in either Volts or EUs.

5 Auto-Spectrum A single-channel display function . Displays the squ a re of the

magnitude of the complex (one-side) Fourier spectrum of x(t). Autospectra are c a librated so that if A is the peak amplitude of a sinusoidal signa l x(t), then the autospectrum has the value A*A (or use A power 2) at the sinusoidal frequency.

6 PSD

(Power Spectral Density)

7 Spectrum A dual-channel display function. Displays averaged linear

Power Spectral Density (PSD) displays the power of random vibration inten s ity as “mean-square acceleration per frequency unit.” PSD is a single-channel display function. It is the Fourier Transform of the Auto-correlation function. This normalization should be used with continuous ra ndom signals.

spectrum computed as the s quare root of the averaged autospectrum.

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Function

Description / Comments

8 FRF A dual-channel function for the single-input, single-

output (SISO) frequency response function between two specified input channels. FRF is the averaged cross-spectrum divided by the averaged autospectrum of the input (the second named channel). When the FRF (#8) or the Cross (#9) button is clicked on; then the following buttons for more complex data displays become active. These buttons, not shown in the above figure, will appear in the toolbar between buttons #15 and # 21.

Magnitude: Plots only the magnitude of real or complex data.

Phase: Plots only the phase of complex data.

Magnitude and Phase: Plots both Magnitude and Phase data.

Real: Plots only the Real numbered data.

Imaginary

Real and Imaginary: Plots both Real and Imaginary data.

Nyquist: A Nyquist plot is another way to display real and imaginary data. The real numbered data is plotted on the X-axis and the imaginary numbered data is plotted on the Y-axis with consecutive points joined by line segments. From basic vibration theory, a Nyquist plot of a mobility function should trace out a circle (counter-clockwise) as the frequency is increased through an isolated structural resonance.

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Function

Description / Comments

9 Cross* A dual-channel display function in the frequency

domain. It is equal to the product of the complex Fourier spectrum of y(t) (the numerator or first named channel) times the complex conjugate of the Fourier spectrum of x(t) (the denominator or second named channel). The special case y=x yields the autospectrum. Averaging of these functions (frequency-domain averaging) forms the basic foundation on which virtually all other multichannel, frequency-domain analysis is built. The cross spectrum is calibrated in units of (peak EUy) (peak EUx).

When the Cross (#9) or FRF (#8) button is clicked on; then the following buttons for more complex data displays become active. The buttons will appear in the toolbar between buttons #15 and # 21 and are briefly discussed in the FRF section (preceding row) of this table.

10 Coherence* A dual-channel display function. At each frequency,

the coherence is a value between 0.0 and 1.0, which indicates the degree of consistent linear relationship between two signals during the averaging process. A value of less than one indicates that phase cancellation occurred during cross-spectrum averaging, which may be due to uncorrelated noise on one or both signals or to a nonlinear relationship between signals.

11 Octave* Many sounds, including audible noise for a

transmission line, are broad band, having components that are continuously distributed over a range of frequencies. The spectrum of such a sound can be approximated in terms of a series of octave band or one-third octave band pressure levels. A band is designated by its center frequency, f0, which

is the geometric mean of the upper and lower frequencies of the band. (See ANSI/ASC S1.6-1984.) This button activates two Octave Type buttons, i.e., Full Octave (#16) and 1/3 Octave (#17).

* Buttons 9, 10, 11 will only be active if there is a “Reference Channel.” A channel can be selected

to “Reference” in the Input/Output Channels Tab via the Response/Reference column.

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Function Description / Comments

12 Transfer Function Activates additional buttons for the Transfer Type options. The 6

buttons appear in the toolbar area between buttons #15 and #21 when the Transfer Function button is clicked on [they are not shown in the above figure]. The Transfer Function buttons are:

Inertance, which is: Acceleration divided by Force.

Mobility, which is: Velocity dived by Force.

Compliance, also known as Receptance, which is: Displacement divided by Force.

Apparent Mass, which is: Force divided by Acceleration.

Impedance, which is: Force divided by Velocity.

Dynamic Stiffness, which is: Force divided by Displacement.

Transfer function displays assume the reference channel is a force channel. You MUST define the response channels to be the correct type of data (acceleration, velocity, or displacement) that you are acquiring. Define these in the data type column of the Calibration window. This allows the data to be integrated or differentiated correctly to derive the desired transfer function.

13 Averaged Time A single-channel display function. Displays a time domain

waveform of averaged, sampled data scaled in either Volts or EUs.

14 Negative Spectrum Reference Spectrum minus Current Spectrum displays the

difference between the Reference Spectrum and the Current Spectrum when the following is specified: Linear (-), Negative Averaging

15 Windowed Time Applies to the FFT Response window specified in the Miscellaneous

Tab of the Configuration window to time data.

16 Full Octave Extends from a lower frequency, f02 to twice the lower frequency

(2f0). The <Full Octave> button is only actie when the <Octave>

button (#11) is selected.

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Function

Description / Comments

17 1/3 Octave Extends from a lower frequency ( f0/2) to 32 times the lower

frequency (32 f0). The Octave (one-third octave) band

sound-pressure level is the integrated sound-pressure level of all spectral components in the specified octave or one-third octave band. The <1/3 Octave> button is only active when the <Octave> button (#11) is selected.

18 Graph Toolbar Opens [or closes] the graph toolbar, which consists of buttons

1 through 17 and buttons 21 through 30.

19 Edit Configuration Opens the Configuration Settings window.

20 Input Channels Button Open: makes a floating window of channel buttons. Closed:

keeps the buttons on the toolbar.

n/a Strip Charts There is no toolbar button for Strip Chart. To add a Strip

Chart:

(a) Go to the Plots menu-bar and open the Window pull-

down menu.

(b) Select the “Add Strip Chart” option.

For detailed information refer to the Strip Charts section in chapter 6.

21 XY Axis Grids Used to add or remove vertical and horizontal grid lines.

22 Auto Scale XY Axis Lets the application automatically adjust the X and Y axis.

23 Manually Scale Y Axis Lets the user manually adjust the Y-axis.

24 Manually Scale X Axis Lets the user manually adjust the X-axis.

25 Manually Scale X & Y Axis Lets the user manually adjust both the X and Y-axis.

26 Cursors Cycles through the following cursor options: Cursor Off, Single

Cursor, Dual (Band) Cursor, Harmonic, SideBand, Peak, FreeForm. Use the Amnotation button (#27) to view X and Y values associated with the cursors.

For detailed information refer to the Using Cursors section in chapter 6.

27 Annotation Provides a means of displaying cursor values in terms of x and

y. Annotation can be displayed as numbers at the cursor or in a frame, which includes forward and backward scrolling arrows. Note that the annotation color will match the “Foreground” color as set in Edit/Display Preferences. Note that the Annotation frame will only display up to 6 sets of cursor values.

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Function Description / Comments

28 Differential Differential (also referred to as Differentiation) is for display purpose only

and does not modify the data. Differentiation is only active when frequency domain data is displayed. Select single or double differentiation or none by continuous clicks of the button (#28). In the plot display’s “Y-Axis” label, a “&” indicates single differentiation, “&&” indicates double differentiation, and no ampersand indicates no differentiation. Note that both Differentiation and Integration are calculated by dividing each element of the function by (jw)^n, where j is the square root of -1; w is the product of 2 pi times the frequency of the block element; and n is an integer from +2 to -2. If the signal is displacement, then single differentiation (&) results in velocity, and double differentiation (&&) results in acceleration.

29 Integral Integral (also referred to as Integration) is for display purpose only and does

not modify the data. Integration is only active when frequency domain data is displayed. Select single or double integration or none by continuous clicks of the button (#29). In the plot display’s “Y-Axis” label, a “~” indicates single integration, “~~” indicates double integration, and no ampersand indicates no integration. Note that both Differentiation and Integration are calculated by dividing each element of the function by (jw)^n, where j is the square root of -1; w is the product of 2 pi times the frequency of the block element; and n is an integer from +2 to -2. If the signal is acceleration, then single integration (~) results in velocity, and double integration (~~) results in displacement.

Note: Engineering Units change when the instrument type is Acceleration

and integration is implemented.

30 Scale - RMS,

Pk, Pk-Pk

The Scale button allows the user to cycle through the following scales: RMS: (Root Mean Square): The square root of the average of the square of the value of the function taken throughout one period. Peak: Zero to Peak. Pk-Pk: Peak to Peak. Refer to the following illustrations.

RMS

RMS Level

Peak-to-Peak

Peak

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Note: Items 31 through 35 are located at the right end of the toolbar. They are not shown in the

preceding toolbar images due to the width of the complete toolbar graphic. Pages 5-9 and 5-10 depict the types of displays that result from using combinations of these four buttons.

31 32 33 34 35

31 3D Waterfall

32 Frequency or

33 Spectrum

34 Order Tracking

Function Description / Comments

View

Orders Slice View

Display Split View

or Frequency View

Order Tracking

Frequency View

Used to bring up a 3D Waterfall display.

Brings up a display for a chosen frequency. This is a “slice” of the waterfall or order tracing, taken at a given frequency (or order).

Brings up a standard spectrum display plus allows for a second display, either 3D Waterfall or Frequency Slice, but not both.

This button is used to enable the Order Tracking display mode or the Frequency View mode.

The Order Tracking display mode provides a means of displaying data from points which are evenly spaced by RPM, instead of increments of time. On the x-axis scale of the Order Tracking display: 1 equals shaft RPM, 2 equals 2 x Shaft RPM, 3 equals 3 x Shaft RPM, etc. Order Tracking presents data in the frequency domain. To use Order Tracking a tachometer must be assigned to an enabled channel.

Note that if the <Order Tracking> and <Slice View> buttons are both enabled, eZ-Analyst displays the slice view above the order tracking view. The Order Tracking display can be enabled from either the Measurement (Real Time) mode or the Playback mode.

The Frequency View mode is the standard eZ-Analyst spectrum view. When this view is enabled the button appears as shown to the immediate left.

Tach Selection

(

for use with

Order Tracking

)

Note: Buttons 31, 32, and 33 are enabled for most single-display spectral function views (FV). They are

never enabled for time function views as the x-axis must be in frequency. Any two of these three functions can be displayed at the same time. See table on followig page in regared to button combinations and resulting displays.

In regard to button # 34, to enable Order Tracking click the button after verifying the following:

o at least one tachometer is assigned to a channel o the tach channel is enabled o no dual-function window is open, e.g., no FRF (see item # 8).

eZ-Analyst 916994 Toolbar Buttons 5-7

This pull-down selection list of available enabled tachometer channels is visible on the toolbar only when Order Tracking (Button #34) is enabled. The selected tach will apply to each enabled input channel. Select “Default Tach” when you want to assign each channel to its default tachometer [as determined in setup configuration].

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Selecting Displays

Configuration* Buttons Status Example Display

31 32 33 34

Display Selected:

Frequency Slice

31 32 33 34

Displays Selected:

Waterfall and

Frequency

31 – 3D Waterfall View

32 - Slice View

33 – Split View

34 – Order Tracking, or Frequency View

31 – 3D Waterfall View

32 - Slice View

33 – Split View

34 – Order Tracking, or Frequency View

OFF

Frequency

Frequency Slice View Display

Grayed-Out

Frequency

3D-Waterfall and

Frequency Display

31 32 33 34

Displays Selected:

Waterfall and

Frequency Slice

31 – 3D Waterfall View

32 - Slice View

33 – Split View

34 – Order Tracking, or Frequency View

Grayed-Out

Frequency

3D-Waterfall and

Frequency Slice View Display

31 32 33 34

Display Selected:

Waterfall

31 – 3D Waterfall View

32 - Slice View

33 – Split View

34 – Order Tracking, or Frequency View

OFF

Frequency

3D-Waterfall Display

*You must have at least one cursor selected for slice display.

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Configuration* Buttons Status Example Display

31 32 33 34

Display Selected:

Order Slice View

31 32 33 34

Displays Selected:

Order Tracking and

Order Slice View

31 – 3D Waterfall View

32 - Slice View

33 – Split View

34 – Order Tracking, or Frequency View

31 – 3D Waterfall View

32 - Slice View

33 – Split View

34 – Order Tracking, or Frequency View

Grayed-Out

OFF

Order Tracking

Order Slice View Display

Grayed-Out

Order Tracking

Order Tracking and

Order Slice View Display

31 32 33 34

Display Selected:

Order Tracking

31 – 3D Waterfall View

32 - Slice View

33 – Split View

34 – Order Tracking, or Frequency View

Grayed-Out

OFF

Grayed-Out

Order Tracking

Order Tracking and

Order Slice View Display

*You must have at least one cursor selected for slice display.

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Interactive Features of the Plot Display Window 6

To add a channel to a plot . . . With your mouse, click and drag a white

channel box into the plot area.

To remove a channel from a plot . . . With your mouse, click and drag a channel box from the right of the plot into the plot

area.

To ADD a channel, click-on the desired “channel box” and drag it into the plot region.

To REMOVE a channel, click on the desired “channel box” in this area and drag it into the plot region.

Introduction ……6-1

Adding and Removing Channels …… 6-1

Using Cursors …… 6-2

Additional Functionality …… 6-6

Copy …… 6-6 Strip Charts…… 6-7 XLS Overlay …… 6-8 Displaying Channel Pairs …… 6-10 Changing the Display Range ….. 6-10 Changing Format, Scale, and Grid …… 6-12

Introduction

To change a plot’s display characteristics; it must be the “focus plot.” For focused plots you

can use toolbar buttons [listed in the following table]; or use the mouse or key commands to make changes to the way in which the data is displayed.

Focus can refer to the window that is in focus, as well as to a plot that is in focus. When

multiple plot windows are open, one is always the “focus window.” When a window does not

have focus, its title bar is dimmed. To change the “focus window,” simply click on title bar of the window of interest.

Clicking the “Graph Toolbar” button will bring up a buttons toolbar, which provides a means of quickly implementing various plot display functions. An alternative to using the buttons is to “right-click” in a plot display, then use the resulting function menu. When the graphic toolbar is open, clicking the button again will close it. The buttons are identified and explained in the chapter section entitled Using the Toolbar Buttons.

Adding and Removing Channels

eZ-Analyst 988191 Interactive Plot Display 6-1

Graphic Toolbar Button

Page 100

The graph toolbar, discussed in chapter 5, includes a button, which permits the user to cycle through cursors by function. Each click of the button cycles to another type of cursor function: No cursor, Single, Dual (Band), SideBand, Peak, and FreeForm.

Note: Another method of choosing a cursor, as opposed to using the cursor button,

is to right-click on the plot region and select “cursor” from the resulting popup window.

The toolbar includes an annotation button which is similar in appearance to the cursor button. The annotation button cycles through the following: No annotation, frameless annotation, and framed annotation.

Tip: If annotations or cursors are not visible, check the color settings in the Display Preferences window to ensure that you are not making use of, for example, a white foreground on a white background.

Cursor-1, 2, and nX boxes are used to set cursor colors.

Sets the Annotation frame color.

The “Line / Point” toggle

buttons are use to set the cursor’s appearance to a full line with an X Y intersect point, or to a single intersect point.

Sets the Annotation text color. If you do not see the annotation, check the color setting, it is likely the same as your background or frame color.

Using Cursors

In eZ-Analyst cursors can appear as vertical lines that indicate an X Y axis intersect via an asterisk (*), or can appear as an asterisk alone. Line and Point settings are made from the Display Preferences window (following figure) which is accessed from the Edit Pull-down menu. The window also allows you to change settings for cursor colors, the number of cursors to be used in Peak and FreeForm modes, and select the desired type of cursor movement.

Display Preferences Window, Areas Affecting Cursors

6-2 Interactive Plot Display 988191 eZ-Analyst