HP E1725C Getting Started Manual
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HP E1725C Getting Started Manual

HP E1725C Getting Started Manual

Time interval analyzers with the hp e1742a/43a/44a/46a/48a analysis software
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HP E1725C and HP E1740A
Time Interval Analyzers with the
HP E1742A/43A/44A/46A/48A
Analysis Software
Getting
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  • Page 1 Getting Started Guide HP E1725C and HP E1740A Time Interval Analyzers with the HP E1742A/43A/44A/46A/48A Analysis Software...
  • Page 3 Getting Started Guide This guide describes how to start using the HP E1725C and the HP E1740A Time Interval Analyzers (TIA) with the HP E1742A, HP E1743A, HP E1744A, HP 1746A, and HP E1748A Analysis Software (HP E1725C options 242, 243, 244, 246, and 248, respectively).
  • Page 4 HP receives notice of such the mains power source to the defects during the warranty product input wiring terminals period, HP will, at its option, Indicates Direct current. or supplied power cable. either repair or replace products which prove to be defective.

  • Page 5: Table Of Contents

    Documentation List Where to Find Information How to Begin In this Chapter HP E1725C and HP E1740A Time Interval Analyzers with the HP E1742A/43A/44A/46A/48A Analysis Software Assembling the TIA HP E1725C TIA Assembly Installing the HP E1742A/43A/44A/46A/48A Analysis Software...
  • Page 6 Contents Hints Provided in Italics TIA Tutorial Presetting the Instrument to a Known State Recalling a Saved Data File and Setup Configuring the TIA for a Measurement (Setup Menu) Initiating a Measurement and Viewing Results (Measure Menu) 2-16 Using Cursors, Markers and Zooming 2-19 Printing Results 2-25...
  • Page 7 Contents Index Getting Started Guide...
  • Page 8 Contents Getting Started Guide...

  • Page 9: In This Guide

    In This Guide This book is the getting started guide for the HP E1725C and HP E1740A Time Interval Analyzers. It consists of a table of contents, this preface, three chapters, and an index. This preface contains the following information •...

  • Page 10: Description Of The High Performance Time Interval Analyzer

    • Continuous edge sampling up to 80 MHz rate In the HP E1743A and E1744A, every edge can be timed in a pulse series up to an 80 MHz rate (12.5 ns minimum continuous interval, 3.2 µsec maximum interval). In the HP E1742A, HP E1746A, and...

  • Page 11: Documentation List

    Resolve signal edge timing to within 50 ps LSD Characterize small amounts of jitter and timing noise on a single-shot basis. Documentation List The following manuals are part of the standard HP E1725C Time Interval Analyzer: Manual Title HP Part Number...

  • Page 12: Where To Find Information

    When first starting to use the HP E1725C or HP E1742A/43A/44A/46A/48A, refer to this Getting Started Guide. When setting up the HP E1740A TIA in a VXI system you will find very important information in the HP E1740A User’s Guide.

  • Page 13: How To Begin

    How to Begin...
  • Page 14 HP E1725C Possible Alternatives VXI mainframe 6-slot mainframe (included) 13-slot mainframe, such as the HP E1401B Computer HP Omnibook 5700 CTX Laptop HP Vectra or IBM- Computer compatible PC with HP 82335B or HP 82341B HP-IB card installed VXI interface/control...
  • Page 15 Chapter 1 How to Begin In this Chapter Components Provided Components Needed with a Standard to Configure a TIA HP E1725C Possible Alternatives MS-DOS 6.0 (or later) (included) MS-DOS 5.0 (or later) ® ® Windows 3.1 or Windows _____ ®...

  • Page 16: Hp E1725C And Hp E1740A Time Interval Analyzers With The Hp E1742A/43A/44A/46A/48A Analysis Software

    Time Interval Analyzers with the HP E1742A/43A/44A/46A/48A Analysis Software The HP E1725C TIA is a stand-alone instrument. Connect the pieces as described below and apply power. Skip the steps that do not apply. The TIA is then ready to start measuring.

  • Page 17: Assembling The Tia

    Just skip the steps that do not apply to your situation. The intention is to meet your needs if in the future you need to rebuild an HP E1725C that has been disassembled. The standard HP E1725C is shipped from the factory assembled and configured.
  • Page 18 Chapter 1 How to Begin Assembling the TIA Install blank panels over any unused slots of the VXI mainframe to help maintain proper cooling of VXI modules. Apply power to the laptop computer and the VXI mainframe. Getting Started Guide...

  • Page 19: Installing The Hp E1742A/43A/44A/46A/48A Analysis Software

    The HP E174XA readme file can be viewed by one of the following methods: • Insert the HP E174XA disk 1 in drive a: (or whatever floppy drive is appropriate). Start Windows 95, select Programs group, double-click on Windows Explorer icon, choose drive a:, and double-click on the “readme.wri”...

  • Page 20: Install The Hp Tia Software

    Chapter 1 How to Begin Installing the HP E1742A/43A/44A/46A/48A Analysis Software Install the HP TIA Software Insert the HP E1742A/43A/44A/46A/48A disk 1 into the 3.5-inch floppy drive. Start Windows. Open Windows Explorer and double-click on Setup File to install the software.

  • Page 21: To Modify The Directory

    An Interface Options window will appear next. If you are using an HP 82335A HP-IB interface, the appropriate Window’s driver (hpib.dll for the HP 82335A) will be installed for you. If you are certain that the correct interface driver is already available on your system (and in the “path”), you may leave “Other/None”...
  • Page 22 When the installation is complete, click the OK button. A new program group “HP Applications” will be created. The HP E174XA software, a “read-me” file and the Help icon will be placed in this program group.

  • Page 23: Power-Up And Health Check

    Select the appropriate interface and addressing. Refer to the on-line Help under the topic of “Interface” and the corresponding documentation that came with the interface. Refer to the HP E1740A User’s Guide for details on address switch settings. Click on OK once the setting is chosen.

  • Page 24: Verify Communication

    A convenient way to test the interface with the TIA is to check for an error condition in the HP E1740A. This is a fairly comprehensive test as it requires that the interface is configured correctly and that the hardware is operational.

  • Page 25: Where To Now

    Chapter 1 How to Begin Where to Now? Where to Now? If this is your first time using the TIA, you may want to follow the short tutorial in Chapter 2. It demonstrates how to set up the TIA to acquire and analyze measurement data without the need for an actual signal to measure.
  • Page 26 Chapter 1 How to Begin Where to Now? 1-14 Getting Started Guide...

  • Page 27: Practice Using The Tia

    Practice Using the TIA...

  • Page 28: In This Chapter

    Using the cursors and zooming • Printing results This Getting Started Guide covers features and functions available in the following software applications: • HP E1742A SONET/SDH Tributary Jitter Analyzer • HP E1743A Clock Jitter Analyzer • HP E1744A Token Ring Jitter Analyzer •...
  • Page 29 Chapter 2 Practice Using the TIA In this Chapter Each of the above products has functionality specific to a given application, which may not be explicitly covered in this tutorial. Refer to the on-line help in each software package for application-specific information.

  • Page 30: Conventions Used In The Tutorial

    Chapter 2 Practice Using the TIA Conventions Used in the Tutorial Conventions Used in the Tutorial Selecting Commands with the Mouse You select commands by pointing with the mouse cursor and then clicking on each of the commands by pressing the left mouse button. For example, when you see, Setup>Instrument Setup..., click on the Setup menu and then the Instrument Setup...

  • Page 31: Tia Tutorial

    TIA application. NOTE The windows and dialog boxes shown in this guide are those of the HP E1742A. The screens on the HP E1743A/44A/46A/48A may have a slightly different appearance. Presetting the Instrument to a Known State Once the TIA application is started, select File>Load Default Setup.

  • Page 32: Recalling A Saved Data File And Setup

    Chapter 2 Practice Using the TIA TIA Tutorial A window will appear with an explanation similar to the one shown here when you retrieve the default setup. Click on the Yes button to proceed. Recalling a Saved Data File and Setup Select File>Load Data File...

  • Page 33: Configuring The Tia For A Measurement (Setup Menu)

    The window is divided into five or six separate areas. Input Configure, Trigger, Calibration & Errors, Reference, and Interface are common to all HP E174XA products. You will only need to modify the Input Configure and Trigger selections for most measurements. In most cases, changes become effective when you click the OK button and close this dialog box.
  • Page 34 If for any reason the HP E1740A front panel “Error” LED (red) is illuminated, you can query the HP E1740A for the type of error. This also clears the error condition on the instrument. The error type will be displayed.
  • Page 35 The Sample Rate parameter controls the maximum rate at which the signal can be sampled. It does not control the rate at which the signal is actually sampled. See the HP E1743A/44A on-line Help for more information about Sample Rate.
  • Page 36 TIA input channel (1 or 2) which will be used to collect the data for measurement computations. The actual data acquisition and processing will be selected and initiated from the Measure menu. (The HP E1743A/44A/46A/48A dialog boxes will look slightly different than the HP E1742A shown above.) 2-10...
  • Page 37 FFT computations, etc. Next to “Phase & Frequency Deviation,” (or “Period, Frequency, TI, & Phase” in the HP E1743A/44A) you will see that you can modify the number of frequency measurements or points to be displayed, and the time duration of the measurement.
  • Page 38 In general, the TIA does not have to time stamp every zero crossing of the input signal to reconstruct the modulation or jitter on the signal. Selection of Auto pacing allows the HP E174XA software to determine the number of skipped zero crossings in order to capture the specified number of samples in a given measurement time (as specified in the Parameters for: field).
  • Page 39 Autoscale function. Display masks can also be turned on in the Display Setup dialog box. Search the HP E1742A/46A/48A on-line Help for Show Masks to obtain more information. To annotate or title the display, simply click in the box beneath Title and enter the descriptive text.
  • Page 40 Chapter 2 Practice Using the TIA TIA Tutorial To modify the X or Y scaling, highlight the number of interest and enter the new value. If you don’t know these values, click Get Autoscale Values and the software will determine them for you. If you click on the Show Points box, each measurement point will be displayed with a “+”...
  • Page 41 Chapter 2 Practice Using the TIA TIA Tutorial Select the format for measurement units by selecting Setup>Phase Units. You can select units for the phase measurement results from this window. All phase displays will show the selected units on the Y axis. You can obtain other phase units by clicking on a point.

  • Page 42: Initiating A Measurement And Viewing Results (Measure Menu)

    Chapter 2 Practice Using the TIA TIA Tutorial Initiating a Measurement and Viewing Results (Measure Menu) Click on Measure to view the available measurement selections. Since this demonstration is using a saved data file, do not select any of the measurement choices at this time.
  • Page 43 Chapter 2 Practice Using the TIA TIA Tutorial MEASURE MENU VS VIEW MENU. The choices on these two menus are very similar, however the action performed by the instrument is quite different. Selecting any of the choices on the Measure menu will cause the instrument to initiate a measurement and acquire a new set of data points and perform the selected result processing.
  • Page 44 Chapter 2 Practice Using the TIA TIA Tutorial Select View>Phase Power Spectral Density. This display was computed from the “fm.pan” data. This is the power spectral density plot of the modulating tone. The 11 kHz modulation is easily seen on this display, as well as other modulation products. 2-18 Getting Started Guide...

  • Page 45: Using Cursors, Markers And Zooming

    Chapter 2 Practice Using the TIA TIA Tutorial Using Cursors, Markers and Zooming Select View>Frequency Deviation. The results display is divided into two primary areas. The major portion of the display is devoted to the graph of measurement results, in this case frequency deviation vs.
  • Page 46 Immediately beneath this information is the graph title as entered on the Setup>Display Setup menu, “Frequency Modulation”. The HP E1742A/43A/44A/46A/48A software prompts you for a graph title the first time a measurement has been made. This title is retained for subsequent measurements and can be modified by selecting Edit>Display Setup.
  • Page 47 Chapter 2 Practice Using the TIA TIA Tutorial Position the cursor on a peak of the sinusoid and click the left button on the mouse. The last line of the display shows the x value of the cursor (time), the difference between the measured frequency and the carrier frequency Fo (Freq Deviation), and the absolute frequency value (Freq).
  • Page 48 Chapter 2 Practice Using the TIA TIA Tutorial Position the cursor at the next peak of the sinusoid and click the left button. The result log now shows the coordinate values for the new position of the cursor. Clicking the right mouse button will provide both the current cursor position information and the difference between the current position and the last position where the mouse was clicked.
  • Page 49 Chapter 2 Practice Using the TIA TIA Tutorial You can also display the delta marker (marker 2) on a clicked point by holding the SHIFT key while clicking the right mouse button. The same information as above is displayed as MRK2> and MRK1to2>. To clear a marker, hold down the CONTROL key while clicking on the appropriate mouse button.
  • Page 50 Chapter 2 Practice Using the TIA TIA Tutorial negative peak and release it. The green box defines the zoomed display when the Zoom button is clicked. Click the Zoom button. NOTE You can define the zoom area anywhere in the data display area where the cursor appears as a “+.”...

  • Page 51: Printing Results

    Windows Control Panel application. If a printer is not currently active, the buttons will disappear and you will need to exit and restart the HP E174XA software to get them back. Selecting File>Print Graph with Log will print both the measurement graph area and the current results displayed in the log area.
  • Page 52 Chapter 2 Practice Using the TIA TIA Tutorial 2-26 Getting Started Guide...

  • Page 53: Demo Waveforms

    Demo Waveforms...

  • Page 54: In This Chapter

    HP E1740A TIA and processed using the applications software. The acquired data was saved in files in the “demo” directory. The examples shown can be duplicated with the HP E1742A, HP E1743A, HP E1744A, HP E1746A, or HP E1748A. These data files are “generic”...

  • Page 55: Demo 1: Voltage-Controlled Oscillator (Vco) Frequency Step Response And Settling

    116 µsec prior to the voltage step. This trigger signal is connected to the “Trigger” input of the HP E1740A. The VCO output signal is connected to input 1 of the HP E1740A, and is 1 volt pk-pk, centered at 0 volts (no DC offset).
  • Page 56 Settling Select Setup>Instrument Setup... to view the HP E1740A setup menu. This is the Instrument Setup menu for the HP E1740A, configured to measure the VCO signal. The input circuitry for inputs 1 and 2 and the trigger input, as well as the delay from trigger are specified on this menu.
  • Page 57 Phase & Frequency Deviation measurement processing in the HP E1742A/46A/48A or Period, Frequency, TI & Phase in the HP E1743A/44A. You can see that 1024 measurement samples will be acquired over a period of 1.024 ms. Note that this implies a sample interval of 1 µsec (1.024 msec/1024 samples).

  • Page 58: Frequency Deviation Results

    Chapter 3 Demo Waveforms Demo 1: Voltage-Controlled Oscillator (VCO) Frequency Step Response and Settling Click on the Cancel button to close the Measure/View Setup menu. Select File>Load Data File..Open the demo subdirectory (c:\hpe174Xa\demo) and click on the file “vco.pan.”, and click on OK. This will retrieve the data and display the computed Frequency Deviation vs.

  • Page 59: Cursors And Markers

    Chapter 3 Demo Waveforms Demo 1: Voltage-Controlled Oscillator (VCO) Frequency Step Response and Settling The step response, frequency overshoot, and settling characteristics can be seen clearly on this display. Cursors and Markers The software lets you easily find the (x,y) coordinates of any point on the display (it doesn’t have to be a measurement point.) Position the “crosshair”...
  • Page 60 Chapter 3 Demo Waveforms Demo 1: Voltage-Controlled Oscillator (VCO) Frequency Step Response and Settling Click the Zoom button on the tool bar. The display will “zoom” to the area inside the green zoom box. NOTE Valid cursor positions include any portion of the display where the cursor appears as a crosshair (+).

  • Page 61: Autoscale And Scaling

    Chapter 3 Demo Waveforms Demo 1: Voltage-Controlled Oscillator (VCO) Frequency Step Response and Settling Autoscale and Scaling The application will normally autoscale to the current data set, placing the minimum value near the bottom of the display, and the maximum value near the top of the display.
  • Page 62 Chapter 3 Demo Waveforms Demo 1: Voltage-Controlled Oscillator (VCO) Frequency Step Response and Settling Enter 225 and 325 into the Min Time and Max Time fields respectively. Press ENTER after each entry. The Display Setup dialog box will appear as follows: Click OK to close this window.
  • Page 63 Chapter 3 Demo Waveforms Demo 1: Voltage-Controlled Oscillator (VCO) Frequency Step Response and Settling Select File>Load Default Setup and click on Yes to return the software to the default setup conditions. This completes Demo 1. Getting Started Guide 3-11...

  • Page 64: Demo 2: Phase Modulation Analysis (Bpsk)

    (± 180 degrees). A “1” may be represented by one of the phase states, while a “0” is represented by the other. The HP E1740A is used to gather timing information from the modulated carrier. This information has been processed as deviation in phase from a carrier and stored in a file.

  • Page 65: Overview

    The signal is a 100 kHz carrier, phase modulated by a 1 kHz square wave. The input signal has an amplitude of 500 mV p-p, and is centered about 0 volts. The signal is connected to input 1 of the HP E1740A. Select Setup>Instrument Setup... to view the HP E1740A setup menu.
  • Page 66 Notice that the measurement time for the Phase & Frequency Deviation function in the HP E1742A/46A/48A (Period, Frequency, TI & Phase function in the HP E1743A/44A) is 10.24 msec. This has been done so the display will show a number of cycles of the 1 kHz modulation. The use of...

  • Page 67: Phase Deviation Results

    Chapter 3 Demo Waveforms Demo 2: Phase Modulation Analysis (BPSK) The Carrier Frequency has been entered as a User Specified value of 100.0 kHz. The phase deviation measurements will be computed relative to a constant frequency value of 100 kHz. Click on the Cancel button to close the Measure/View Setup menu.

  • Page 68: Detilt

    Chapter 3 Demo Waveforms Demo 2: Phase Modulation Analysis (BPSK) This is a display of phase deviation from the constant reference frequency, Fo = 100 kHz. The square wave modulation can easily be seen. Using the cursor (left mouse button) and delta cursor (right mouse button) features, you can easily determine the period of the modulation (1/mod rate), and the peak-to-peak values.

  • Page 69: Fft Analysis

    Chapter 3 Demo Waveforms Demo 2: Phase Modulation Analysis (BPSK) NOTE The actual carrier frequency is about 10 Hz greater than the initial value specified for Fo. The DeTilt feature lets you quickly correct for minor discrepancies in Fo. FFT Analysis In certain applications it may be useful to study the spectrum of the modulating tone, or perhaps the spectrum of undesired jitter.
  • Page 70 Chapter 3 Demo Waveforms Demo 2: Phase Modulation Analysis (BPSK) The analysis software offers two methods to view jitter spectrum or phase noise. FFT computations can be made on the currently displayed data (vs. time views). Phase power spectral density calculations can also be performed.
  • Page 71 Chapter 3 Demo Waveforms Demo 2: Phase Modulation Analysis (BPSK) Using the cursor and clicking on each peak in the spectrum, the characteristic odd harmonics of the square wave phase modulation can be seen. Note that this is not the same view as a spectrum analyzer would display (spectrum of the modulated carrier), but a direct view of the spectral content of the modulation.

  • Page 72: Demo 3: Sharing Tia Data With Other Windows Applications

    TIA data and graphics with other applications such as spreadsheets (Lotus, Excel, etc.), word processors, and other computational packages such as MathCad. This demonstration will show how easy it is to share the HP E174XA graphics plots and data with a word processor—in this case the Windows “Write” application.

  • Page 73: Open The Windows' "Wordpad" Program

    Chapter 3 Demo Waveforms Demo 3: Sharing TIA Data With Other Windows Applications Open the Windows’ “WordPad” Program Minimize the TIA application by clicking on the minimize ( ) button in the top right corner of the window. In Windows 95, click the Start button, select Programs group, and select the Accessories icon.
  • Page 74 Chapter 3 Demo Waveforms Demo 3: Sharing TIA Data With Other Windows Applications NOTE Once the FM signal graphics has been copied into WordPad, click the ↓ → down arrow ( ) or the right arrow ( ) to move outside the graphics. You need to perform the above step to append the log window contents to the FM signal graphics, which is demonstrated in the next procedure (titled “Now Add the Log Information”).

  • Page 75: Now Add The Log Information

    Demo 3: Sharing TIA Data With Other Windows Applications Now Add the Log Information Return to the HP E174XA application by clicking on the HP E174XA icon on the taskbar (or pressing ALT-TAB, or selecting it from the Windows pull-down menu). Select Edit>Copy Log as Text. This will copy the entire contents of the logging area of the TIA display as text to the Windows Clipboard.
  • Page 76 In this way, you can add annotations to the data, or delete undesired information. You can copy the entire HP E174XA display using the “Print Screen” key found in the upper right hand corner of most keyboards. Print Screen will copy the entire current display to the Windows clipboard.

  • Page 77: Sharing Data

    Chapter 3 Demo Waveforms Demo 3: Sharing TIA Data With Other Windows Applications Sharing Data Return to the HP E174XA application. Select File>Save Data for Export As..Open the demo subdirectory (c:\hpe174Xa\demo). Type the filename “temp.txt” and click the OK button.
  • Page 78 Chapter 3 Demo Waveforms Demo 3: Sharing TIA Data With Other Windows Applications You now have a list of the raw data measured by the HP E1740A TIA (the “time stamps”—see the Help file for more information). Similarly, you could have imported the data into a spread sheet to perform your own custom analysis of the data.
  • Page 79 HP TIA requirements configuting the TIA initiating a measurement continuous edge sampling viii measurement initiation 2-16 conventions installing HP TIA software cursors cursors, using 2-19 list of documents log information 3-21 data sharing 3-25 data capture...
  • Page 80 Index signal edge timing software operation 1-11 software applications features and functions starting a measurement 2-16 starting HP TIA software 1-11 switch on 1-11 tilt 3-16 time interval analyzer viii turn on 1-11 tutorial write program 3-21 zooming 2-19 Index-2...
  • Page 81 Technical Support: If you need technical assistance with a Hewlett-Packard test and measurement product or application, please contact the Hewlett-Packard office or distributor in your country. Asia Pacific: Canada: Israe: Hewlett-Packard Canada Ltd. (03) 5380 333 5150 Spectrum Way Hong Kong Italy Mississauga, Ontario (852) 2599 7889...
  • Page 83 Continued from front matter. . . Warranty (contd) HP will be liable for damage to Safety Considerations Acoustic Noise Emissions tangible property per incident (contd) HP does not warrant that the LpA<47 dB at operator position, up to the greater of $300,000 or...
  • Page 85     Manual Part Number E1725-90012 Printed in U.S.A, APRIL 1998...

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E1740a

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