Agilent 71501D - Manuals

Contents-2 Contents 5 Specifications and Characteristics Vertical Specifications 5-3Input Channel Specifications 5-4Trigger Specifications 5-5Trigger Specifications 5-6Horizontal Specifications 5-7Declaration of Conformity 5-8

Getting Started Getting Started with the Eye-Diagram Analyzer Getting Started with the Eye-Diagram Analyzer In this chapter, you will find information on the following topics: • Steps for Setting Up Eye-Diagram Analysis 1-4 • Step 1. Connect the Equipment 1-12 • Step 2. Load the Personality 1-16 • S...

1-3 Getting Started Getting Started with the Eye-Diagram Analyzer The custom keypad The eye-diagram analyzer comes with a custom keypad that snaps into the front panel of 70004A displays. The keypad gives you quick access to common instrument functions. (Each of these functions can also be accessed ...

Getting Started Steps for Setting Up Eye-Diagram Analysis Steps for Setting Up Eye-Diagram Analysis 1 Connect the equipment. 2 Load the eye-diagram personality. 3 Complete the installation using the self-guided screens. 4 Set up the measurement conditions. Connect the Equipment You can connect the e...

1-5 Getting Started Steps for Setting Up Eye-Diagram Analysis N o t e When used with an 71612A/70843, the system requires a manual configuration. Set Up the Measurement Conditions Select from eye, eyeline, and pattern modes Use the Setup menu’s diagram softkey to select from one of three measure-men...

1-7 Getting Started Steps for Setting Up Eye-Diagram Analysis Eyeline Mode : Eyeline mode displays continuous traces. Use this mode for the following: • Measure extinction ratio • Measure laser turn-on transition delay• Examine laser overshoot• Observe laser ringing • Apply eye-filter • Apply user-c...

Getting Started Steps for Setting Up Eye-Diagram Analysis Pattern Mode Pattern mode displays the actual PRBS data stream bits. This mode uses the pattern trigger which allows the display to show the same portion of the data stream from sweep to sweep. Mask/limit lines provide pass/fail testing Mask/...

1-9 Getting Started Steps for Setting Up Eye-Diagram Analysis Apply software filters in eyeline mode In eyeline mode, user frequency corrections can be applied to the data to sim-ulate a hardware transmission filter. The eye-diagram analyzer comes with several Bessel-Thomson filters. These files are...

Getting Started Steps for Setting Up Eye-Diagram Analysis Three sweep selections are available • single• continuous• stopped With the continuous selection, sweeps occur as soon as the selected triggering conditions are met and repeat continuously as long as the trigger conditions are met. The source...

1-11 Getting Started Steps for Setting Up Eye-Diagram Analysis These softkeys can also be used to specify an optical-to-electrical responsivity conversion between the source and input channels. As a result, the display shows optical units referenced to the input of the optical-to-electrical con-vert...

Getting Started Steps for Setting Up Eye-Diagram Analysis Step 1. Connect the Equipment 70841A/B Pattern Generator and 70311A Signal Generator Modules 1 If you are using 70841A/B pattern generator and 70311A signal generator modules with your eye-diagram analyzer, install them into an MMS mainframe ...

1-13 Getting Started Steps for Setting Up Eye-Diagram Analysis 2 If you are using 70841A/B pattern generator and 70311A signal generator modules with your eye-diagram analyzer, connect cables to the instruments as shown in the following graphic. • If you are using a clock source other than an 70311A...

Getting Started Steps for Setting Up Eye-Diagram Analysis 4 If the attenuator connected to the 70820A’s RF INPUT 2 connector is not 6 dB, press: Trg,Cal , CH2 EXT ATTEN , then enter the value of the attenuator Front-Panel Cable Connections Cables: SMA to SMA (Channel 1) p/n 8120-4948 SMA to SMA (Cha...

Getting Started Steps for Setting Up Eye-Diagram Analysis Connections without a Laser Source and Converter If a laser source and optical-to-electrical converter are not available, use the alternate connection shown in the following figure. In this case, the pattern generator’s data output is display...

1-17 Getting Started Steps for Setting Up Eye-Diagram Analysis If the Program Failed to Load The program has failed to load if one of the following occurs: • The message Please wait... Loading 70874 never shows. • The left-side softkeys match those shown in the following figure. “Manually Load the P...

Getting Started Steps for Setting Up Eye-Diagram Analysis 3 If the screen does not resemble the above figure, press: msi:, HP-MSIB CARD , prev menu DISPLAY , Mass Storage, msi , MEMORY CARD MENU The list of files should now be displayed. 4 Turn the front-panel knob to highlight the file "AUTOST&...

1-19 Getting Started Steps for Setting Up Eye-Diagram Analysis Step 3. Complete the Installation Using the Screen Instructions • If the displayed screen looks like the figure on the left side of this page, your system has been previously configured. Press CONT and then continue with "Step 4. Con...

Getting Started Steps for Setting Up Eye-Diagram Analysis First Self-Guided Screen 3 Use the following self-guided screen to indicate the 10 MHz frequency reference used. Press INTERNL if the 70820A module is used as the reference. Press EXTERNL if the clock source is used as the reference.

1-21 Getting Started Steps for Setting Up Eye-Diagram Analysis 4 The following screen should be displayed. Notice that the eye-diagram analyzer’s left-side Setup menu is selected. 5 If you have not already connect the cables to the instruments’ front panels, follow the instructions shown. Otherwise,...

Getting Started Steps for Setting Up Eye-Diagram Analysis the instruments’ front panels, follow the instructions shown. Otherwise, proceed with “If you have not already connect the cables to the instruments’ front panels, follow the instructions shown. Otherwise, proceed with “If you have not alread...

1-23 Getting Started Steps for Setting Up Eye-Diagram Analysis N o t e Using the CLOCK OUT trigger signal provides faster data acquisition for eye- diagrams. If the amplitude of the trigger signal is too large, an over-range message is displayed. If a message is displayed, reduce the amplitude of th...

Getting Started Steps for Setting Up Eye-Diagram Analysis Controlling an 70841A/B Pattern Generator When using the 70311A clock source (below 3 Gb/s): This section explains how to display the menus for the 70841A/B pattern gen-erator. The display can be assigned to control either the eye-diagram ana...

1-25 Getting Started Steps for Setting Up Eye-Diagram Analysis 70841A/B appears. c Press ADJUST ROW , and rotate the knob to move the box to the row where the 70841A/B appears. d Press ASSIGN BOTH . 4 Use the displayed softkey menus to set the pattern generator to the desired settings. For an exampl...

Getting Started Steps for Setting Up Eye-Diagram Analysis 3 Turn the display off and select trace one by pressing: Traces , display ON|OFF OFF, select: , TR1 Move the Measurement Plane To move the measurement plane, press: Trg,Cal , CH1 EXT ATTEN and enter the attenuation on channel 1 input. Optiona...

1-27 Getting Started Steps for Setting Up Eye-Diagram Analysis 3 The eye-diagram is now ready for use. To restore the factory instrument preset Restore the factory instrument preset by pressing: MENU , page 1 of 2 , States , more 1 of 2 , preset: FAC|USR FAC

Application Tutorials Application Tutorials Application Tutorials This chapter contains nine tutorials that introduce important eye-diagram analyzer features. The tutorials should be performed in the order listed. To create the data signal, you will need a pseudo-random binary sequence (PRBS) patter...

2-3 Application Tutorials Application Tutorials Clock Freq: 2.48832 GHz Clock Ampl: 500 mV Clock Hi-Lvl: 0 V If you’re performing these tutorials without the laser source and optical-to-electrical converter, reduce the level of the data signal as shown in the follow-ing settings: • Data Ampl 250 mV ...

Application Tutorials Tutorial 1: Measure Eye-Parameters Tutorial 1: Measure Eye-Parameters The eye-diagram analyzer performs automatic eye measurements in eye mode. This mode is similar to that of conventional sampling oscilloscopes; the display shows individual dots. View the Signal 1 To view the ...

2-5 Application Tutorials Tutorial 1: Measure Eye-Parameters Example of a Large Overshoot Resulting from Laser Bias Perform an Offset Calibration This calibration procedure removes any offset that may be present in the opti-cal-to-electrical converter. This is sometimes referred to as the "dark&...

Application Tutorials Tutorial 1: Measure Eye-Parameters Enabling this function approximately doubles the measurement time. 8 Perform the eye measurement by pressing: MEASURE EYE After a brief period of time, the display should look like the following figure. Refer to Chapter 3, “Eye-Diagram Analyze...

2-7 Application Tutorials Tutorial 1: Measure Eye-Parameters Example Extinction Ratio Measurement 10 Change the amount of data used for the histograms by pressing: NUMBER SAMPLES and enter the # of samples A larger value gives more accuracy, but increases the data acquisition time. When making extin...

Application Tutorials Tutorial 2: Measure in Optical Power Units Tutorial 2: Measure in Optical Power Units The analyzer display has the ability to show optical units referenced to the input of the optical-to-electrical converter. This changes the channel and marker readouts to watts/div. 1 Set the ...

Application Tutorials Tutorial 3: Measure Extinction Ratios on Low-Level Signals Tutorial 3: Measure Extinction Ratios on Low-Level Signals Repeatable extinction ratio measurements can be made on low-level signals. This is accomplished by applying a filter to the signal. This filter improves measure...

2-11 Application Tutorials Tutorial 3: Measure Extinction Ratios on Low-Level Signals Autoscaled Display of Low-Level Signal 4 Turn filtering on by pressing: Setup , eyefltr ON OFF ON Perform an Offset Calibration This calibration procedure removes any offset that may be present in the opti-cal-to-e...

Application Tutorials Tutorial 3: Measure Extinction Ratios on Low-Level Signals Measure the Extinction Ratio 8 To measure the extinction ratio, press: Measure , NUMBER SAMPLES and enter 20000 , EXTINCT RATIO Refer to the following figure. Extinction Ratio Measurement on a Low-Level Signal with Eye ...

2-13 Application Tutorials Tutorial 4: Measure Laser Turn-on Delay Tutorial 4: Measure Laser Turn-on Delay On-screen markers can be used to measure both amplitude and time separa-tion in eye-diagrams. The compatible modes for markers are eye, eyeline, and pattern. Change to Eyeline Mode 1 Change to ...

Application Tutorials Tutorial 4: Measure Laser Turn-on Delay Laser Overshoot and Turn-On Delay

2-15 Application Tutorials Tutorial 5: Use Software Filters Tutorial 5: Use Software Filters This tutorial enables a software filter. The filter is designed with user fre-quency corrections. User frequency corrections can be used for: • Removing the effects of frequency response roll-off due to the ...

Application Tutorials Tutorial 5: Use Software Filters User-Corrections Applied to the Data Change to Eyeline Mode 1 Set the analyzer to a known state by pressing: INSTR PRESET , Traces , persist , VARIABL and enter 5 , diagram , EYELINE Notice the level of the laser overshoot, and the turn-on delay...

2-17 Application Tutorials Tutorial 5: Use Software Filters Eyeline Display Showing Laser Overshoot Load the Software Filter 2 Place the 70874A memory card in the front-panel card slot. 3 Display the catalog of files on the memory card by pressing: Mass Storage 4 Turn the front-panel knob to highlig...

Application Tutorials Tutorial 5: Use Software Filters 7 Turn the autoscale function on by pressing: Traces , AUTO-SCALE The display should look like the following figure. Notice that the laser overshoot is no longer visible, due to the filtering effect of the user-corrections in the 71501A. Example...

2-19 Application Tutorials Tutorial 6: Test to Industry Standards Tutorial 6: Test to Industry Standards Masks allow you to test eye-diagrams against industry standards. The eye-dia-gram analyzer provides built-in masks for testing the major SONET/SDH transmission rates. Compatible modes are eye and...

Application Tutorials Tutorial 6: Test to Industry Standards Turn Mask Testing On 6 Turn mask testing on by pressing: Masks , test ON OFF ON This resets the error counters. Errors for the standard specifications show up beside the M1 screen annotation for mask violations, and beside L2 and L3 for up...

2-21 Application Tutorials Tutorial 6: Test to Industry Standards Stop on and Display Trace Errors The eye-diagram analyzer has the ability to stop data acquisition when a mask violation occurs. The number of traces or errors that stop this data acquisition can be specified. In addition, if you are ...

Application Tutorials Tutorial 6: Test to Industry Standards test ON OFF ON The instrument stops sweeping after two error traces have been accumulated. Refer to the following figure. Note that for this figure, errors occur due to overshoot on a zero-to-one transition. Turn off Mask Testing 13 Turn o...

2-23 Application Tutorials Tutorial 7: Default and Custom Mask or Limit Line Testing Tutorial 7: Default and Custom Mask or Limit Line Testing The 70820A menus allow you to create and display up to eight limit lines and masks at one time. Five default mask/limit-line shapes are provided for your use...

2-25 Application Tutorials Tutorial 7: Default and Custom Mask or Limit Line Testing Stretch, Reduce, or Move the Mask 11 To stretch, reduce or move the mask by press: prev menu , scale X|Y or offset X|Y Add a Mask Margin 12 Press the left-side Masks softkey. 13 To automatically align the mask to a ...

Application Tutorials Tutorial 7: Default and Custom Mask or Limit Line Testing Display the Error Trace 23 Display a mask and begin testing as described in this section, and then press: err trc ON|OFF ON Erase a Mask or Limit Line 24 Select the mask or limit line you wish to erase by pressing: MENU ...

2-27 Application Tutorials Tutorial 8: Display the Data Pattern Tutorial 8: Display the Data Pattern The eye-diagram analyzer can display the data pattern. This is done by select-ing the pattern mode and triggering the display trace update on the pattern trigger. This insures the trace on the screen...

Application Tutorials Tutorial 8: Display the Data Pattern Example Pattern Mode Display Add Time Delay 6 Add time delay by pressing: Setup , DELAY Each push of the step keys ( ⇓ and ⇑ ) gives a change in delay equal to exactly one bit. This technique can also be used to step the X offset of the mask...

2-29 Application Tutorials Tutorial 8: Display the Data Pattern 8 Set channel 2 by pressing: CH2 is: , CLK OUT Notice that the diagram softkey annotation no longer indicates pattern mode, and a note is displayed on the screen as shown in the following figure. Example Display of User-Error in Pattern...

Application Tutorials Tutorial 9: Constructing a Low-Pass Filter from a Transfer Function Tutorial 9: Constructing a Low-Pass Filter from a Transfer Function This procedure builds a fourth order Bessel-Thomson filter characterizing SONET/SDH transmitters operating at 2.48832 Gbit/sec. The filter is ...

2-31 Application Tutorials Tutorial 9: Constructing a Low-Pass Filter from a Transfer Function 3 Turn the display off by pressing: Traces , select:, TR1 , display ON OFF OFF 4 Build the equation by pressing: select :, TR2 , input :, build eqn, CLR - END , SEL|EDT SEL 5 Turn the front-panel to highli...

Application Tutorials Tutorial 9: Constructing a Low-Pass Filter from a Transfer Function 6 Build the trace equation shown in the following figure by pressing: RETURN , select:, TR3 , input: , build eqn , CLR - END, SEL|EDT SEL Build the trace equation. Notice the cursor has wrapped to the following...

2-33 Application Tutorials Tutorial 9: Constructing a Low-Pass Filter from a Transfer Function 10 Set the marker on 1.86224 GHz using the knob or numeric keypad. 11 Continue by pressing: Scale , more 1 of 2 , AUTO DELAY , Traces , store trace , to user correct , adaptiv ON|OFF ON 12 Store the filter...

Application Tutorials Tutorial 9: Constructing a Low-Pass Filter from a Transfer Function 14 Highlight "UCORR1" using the knob. 15 Continue by pressing: RETURN , Scale , AUTO-SCALE , page 1 of 2 , Calib , user corr

2-35 Application Tutorials Tutorial 9: Constructing a Low-Pass Filter from a Transfer Function 16 To store the filter to a memory card, press: States , more 1 of 2 , mass storage 17 If the mass-storage device needs to be selected, refer to “Saving to Mass Storage” on page 3-34 . 18 Save the user-cor...

Application Tutorials Tutorial 10: Create a Vertical Histogram Tutorial 10: Create a Vertical Histogram This tutorial creates a vertical histogram on data taken from a sine wave. The procedure, however, works for any type of waveform. Select the Histogram Type 1 Display a trace to perform statistica...

2-37 Application Tutorials Tutorial 10: Create a Vertical Histogram 6 Enter the number of samples to be taken for the histogram by pressing: prev menu , NUMBER SAMPLES , # of samples, ENTER The default number of samples taken is 1000. 7 To draw the vertical histogram, press: SINGLE ACQUIRE Data will...

Application Tutorials Tutorial 10: Create a Vertical Histogram Perform Statistical Analysis The range of sample points used to calculate the mean and standard deviation is the full screen. 9 To change the limits, press: other , UPPER LIMIT, LIMIT → 0%-100% , new upper limit value, ENTER , LOWER LIMI...

2-39 Application Tutorials Tutorial 10: Create a Vertical Histogram 10 To display a line indicating the location of the mean, press: results , MEAN , The mean and standard deviation values are also shown.

Application Tutorials Tutorial 10: Create a Vertical Histogram 11 To display a line indicating the location of the standard deviation, press: STD DEV

2-41 Application Tutorials Tutorial 11: Create a Horizontal Histogram Tutorial 11: Create a Horizontal Histogram This tutorial creates a horizontal histogram on data taken from a sine wave. The procedure, however, works for any type of waveform. Select the Histogram Type 1 Display a trace to perform...

3-3 Eye-Diagram Analyzer Reference Performing Eye-Diagram Measurements Performing Eye-Diagram Measurements To perform the automatic eye-diagram measurements, use the Measure menu. With the exception of extinction ratio, these measurements must be per-formed in eye mode. Automatic Measurements The Me...

Eye-Diagram Analyzer Reference Performing Eye-Diagram Measurements Use the NUMBER SAMPLES softkey for this purpose. • Use the MEASURE EYE to initiate a number of automatic histogram measure- ments on an eye-diagram. • Use the r/f tim ON OFF softkey to enable rise time and fall time measurements duri...

3-5 Eye-Diagram Analyzer Reference Performing Eye-Diagram Measurements Crossing Level This measurement is the amplitude that the one level and zero level cross. It also expresses the level as a percentage of the mean one level and mean zero level difference. Eye Width This measurement is the eye wid...

Eye-Diagram Analyzer Reference Performing Eye-Diagram Measurements For Optimum Performance The 70820A module should be configured to: • Control the RF source over the communications bus. • Share the same frequency reference as the RF source. Channels Versus Traces The 70820A module has two input cha...

3-7 Eye-Diagram Analyzer Reference Generating Histograms Generating Histograms The 70820A can perform statistical analysis on any displayed trace. After cre-ating a vertical or horizontal histogram of the trace data, the display can show mean and standard deviation values of the histogram. Histogram...

Eye-Diagram Analyzer Reference Generating Histograms When generating histograms, you must perform the following basic steps: 1 Select a trace. 2 Select histogram type. 3 Enter the number of samples. 4 Set limits for acquired data. 5 Acquire the data. 6 Establish limits for statistical analysis. 7 Vi...

3-9 Eye-Diagram Analyzer Reference Masks and Limit Lines Masks and Limit Lines Masks and limit lines allow you to test the shape (time or frequency versus amplitude) of a displayed response. Masks are closed polygon shapes. Limit lines are lines. Traces or measurement points that penetrate a mask or...

Eye-Diagram Analyzer Reference Masks and Limit Lines A Limit Line Displayed on Screen Because you can perform repetitive testing of response shapes, masks and limit lines are ideal for pass/fail testing on production lines. You create, save, recall, and edit limit lines using the masks, limits menu....

3-11 Eye-Diagram Analyzer Reference Masks and Limit Lines Testing Responses Once you’ve created a mask or limit line, set the following conditions for test-ing: • Trace to which testing is applied. • Violations defined as traces or measurement points. • Testing ends after a set number of errors. • T...

Eye-Diagram Analyzer Reference Eye-Diagram Menu Maps Eye-Diagram Menu Maps The two menu maps in this section graphically represent the eye-diagram ana-lyzer’s softkey menus. Setup and Trg, Cal Menus

Eye-Diagram Analyzer Reference Agilent 70820A Menus Agilent 70820A Menus This section discusses the softkey menus for the 70820A microwave transition analyzer module. To learn about the eye-diagram analyzer’s menus, refer to “Eye-Diagram Menu Maps” on page 3-12 . These menus provide additional fea- ...

3-15 Eye-Diagram Analyzer Reference Agilent 70820A Menus The Left-Side Softkeys Use the softkeys located on the left side of the display to access the twelve major menus. These softkeys are shown in two pages . Press page 1 of 2 to view the second page of softkeys. When the 70820A module first turns...

Eye-Diagram Analyzer Reference Controlling the Display Controlling the Display To Control the Number of Bits Displayed The Setup menu’s BIT INTVL softkey allows you to select the number of bits that will be displayed on the screen. The horizontal time scale automatically changes to the appropriate s...

Eye-Diagram Analyzer Reference Controlling the Display To learn more about these files and about creating and applying user-correc-tions, refer to “Tutorial 5: Use Software Filters” on page 2-15 . 1 Place the 70874A eye-diagram analyzer memory card in the front-panel card slot. The 70874A eye-diagra...

3-19 Eye-Diagram Analyzer Reference Controlling the Display 4 Load the file by pressing: LOAD FILE The file is loaded when user-corrections loaded is displayed on the screen. 5 Turn the user correction function on by pressing: Trg, Cal , more 1 of 2 , usr cor ON|OFF ON.

Eye-Diagram Analyzer Reference Controlling the Display User-Corrections Applied to the Data To View 70820A Menus Press MENU. To Return to the Jitter Analyzer (or Eye-Diagram Analyzer) Press USER . If the eye-diagram analyzer’s menus are not displayed, load the program as explained in Chapter 1, “Get...

Eye-Diagram Analyzer Reference Controlling the Display 3 To select US or European display format, press US|EURO US or: US|EURO EURO 4 To change the time or date, press: set clock Enter the new value in the same format as displayed. Control the Display’s Clock 1 Press DISPLAY , Misc , clock • If you ...

3-23 Eye-Diagram Analyzer Reference Calibrating the Eye-Diagram Analyzer Calibrating the Eye-Diagram Analyzer N o t e For information on user-corrections and instrument calibration data, refer to “Agilent 70820A User-Corrections” on page 3-49 and refer to “Agilent 70820A Calibration” on page 3-61 . ...

Eye-Diagram Analyzer Reference Calibrating the Eye-Diagram Analyzer 1 Connect a low-loss cable between the front-panel CALIBRATOR OUTPUT and channel 1 connectors. 2 To calibrate the IF, press: MENU , page 1 of 2 , Calib , IF calib , CAL CH1 The calibration routine takes about 30 minutes to complete....

3-25 Eye-Diagram Analyzer Reference Displaying Traces Displaying Traces Four Traces can be Displayed The Traces menu’s select: softkey allows you to display and control up to four traces. The scaling, reference positions, and reference levels of each trace can be separately adjusted. To automaticall...

Eye-Diagram Analyzer Reference Displaying Traces To Position and Scale Each Trace The selected trace can be positioned vertically on the display. This is accom-plished using the REF LEV|POS softkey to enter both the reference position and reference level. The reference position (POS) is entered as a...

3-27 Eye-Diagram Analyzer Reference Displaying Traces The Averaging Submenu Average trace 1 by pressing: Traces , average , AVERAGE SWEEPS and enter the number of sweeps used for running average, average ON|OFF ON Four Persistence Modes are Available The eye-diagram analyzer offers four trace persis...

Eye-Diagram Analyzer Reference Displaying Traces The Persistence Submenu Infinite Monochrome Persistence With infinite monochrome persistence ( INFINIT), traces accumulate on the display until persistence is turned off or the display is cleared using the Setup menu’s CLEAR DISPLAY softkey. Press OFF...

3-29 Eye-Diagram Analyzer Reference Displaying Traces 1 green 2 cyan (light blue) 3 purple 4 rose 5 yellow This persistence works best with high values of N, typically values of 50 through 100. In this mode, no softkeys can be pressed until after EXIT GRAD- ING is pressed . Monochrome Grading Persis...

Eye-Diagram Analyzer Reference Using Markers Using Markers Use this menu to activate the four available line markers: X1, X2, Y1, and Y2. Markers allow you to measure or compare portions of the displayed waveform. For example, you can use markers to measure the peak-to-peak difference in a laser’s t...

3-31 Eye-Diagram Analyzer Reference Applying Mask Testing Applying Mask Testing Use the Masks menu to display and control mask testing. Built in standard masks for the more common SONET/SDH transmission rates are provided. To learn how to create your own custom masks, refer to Chapter 2, “Applicatio...

Eye-Diagram Analyzer Reference Applying Mask Testing Automatic Alignment Scales the Mask The MASK ALIGN softkey, located under the Masks menu, automatically aligns and scales a default mask to the data per the SONET/SDH standards. This is accomplished using histograms and is best done in eye mode fo...

3-33 Eye-Diagram Analyzer Reference Applying Mask Testing The Mask Setup Submenu

Eye-Diagram Analyzer Reference Saving to Mass Storage Saving to Mass Storage Use the Mass Storage menu, to save and recall files to a mass storage device. The mass storage device is normally a memory card that has been inserted into the front-panel card slot. You can also store data to a GPIB disk d...

3-35 Eye-Diagram Analyzer Reference Saving to Mass Storage as long as the card’s battery has sufficient power. You should change the bat-tery every two years using the procedure in this section. Refer to “To Change a Memory Card Battery” on page 3-39 . RAM memory cards have a write-protect switch, o...

Eye-Diagram Analyzer Reference Saving to Mass Storage GPIB Disk Drives Measurement data and files can be saved on an external GPIB disk drive. The disk drive must be a 3.5 inch, CS80 compatible, such as an 9122. To use the drive, you must connect it and enter its GPIB address using DISPLAY menu soft...

3-37 Eye-Diagram Analyzer Reference Saving to Mass Storage Initializing (formatting) a memory card C A U T I O N The following steps erase any files stored on the card. 1 If the memory card is new and needs to be formatted, press: MENU , page 1 of 2 , States , more 1 of 2 , mass storage , more , FOR...

Eye-Diagram Analyzer Reference Saving to Mass Storage 4 Enter the disk drive’s unit number by pressing: UNIT NUMBER This number is typically a 0 or 1. Zero usually indicates the disk drive’s left side slot. 5 Enter the disk drive’s volume number by pressing: VOLUME NUMBER The volume number should be...

3-39 Eye-Diagram Analyzer Reference Saving to Mass Storage To Change a Memory Card Battery The memory card’s battery is a lithium commercial CMOS type, part number CR 2016. The memory card should be installed when the battery is removed. If the bat-tery is removed while the card is not installed, al...

Eye-Diagram Analyzer Reference Saving to Mass Storage Working with Files Files are identified by a prefix and a name. The eye-diagram analyzer assigns a prefix according to the type of data, as shown in the following table. You enter the file name. When cataloged, the file listings show the file’s d...

3-41 Eye-Diagram Analyzer Reference Saving to Mass Storage To Duplicate a Memory Card Instrument BASIC provides the ability to mass copy all the files from one memory card to another memory card. This allows you to easily reproduce copies without having to copy the files one at a time. Use the follo...

Eye-Diagram Analyzer Reference Saving to Mass Storage 6 Issue the following Instrument BASIC command to copy the files from the RAM disk to the new card: COPY "*:MEMORY,0,0" TO ":EXTERNAL,904" To Catalog all Files Use this procedure to catalog default memory. To select default memory...

3-43 Eye-Diagram Analyzer Reference Saving to Mass Storage Entering a File Name without a Keyboard a Turn the front-panel knob to move the character-select cursor. b Press SELECT CHAR to enter a character at the character-select cursor. c Press the numeric keypad to enter numbers or a minus sign. d ...

Eye-Diagram Analyzer Reference Saving to Mass Storage To Erase all Files C A U T I O N This procedure erases all files stored in default memory. To erase all files in default memory, press : MENU , page 1 of 2 , States , more 1 of 2, mass storage , more , FORMAT To Change the Prefix 1 To modify the ...

Eye-Diagram Analyzer Reference Saving to Mass Storage To Save a Mask/Limit Line File 1 Display the Mass Storage menu by pressing: States , more 1 of 2 , mass storage If the mass-storage device needs to be selected, refer to “Selecting and For- matting Memory” on page 3-34 . 2 Enter the file name by ...

3-47 Eye-Diagram Analyzer Reference Creating Copies of the Display Creating Copies of the Display Often, it is important to create hard copies of the display for reports or records. A copy of the display can be printed on any Hewlett-Packard graphics printer. These printers support the Hewlett-Packa...

Eye-Diagram Analyzer Reference Creating Copies of the Display 4 Select the print option by pressing: ← , copy options , COPY IS PRT/PLT PRT 5 Create the print by pressing: USER , PRINT To Create a Plot Hard copies can be produced on an Hewlett-Packard plotter if the eye-dia-gram analyzer is in patte...

3-49 Eye-Diagram Analyzer Reference Agilent 70820A User-Corrections Agilent 70820A User-Corrections User corrections provide a convenient method for modifying the display of input signals. Some of the applications for user-corrections include the follow-ing: • Filtering input signals to simulate the...

Eye-Diagram Analyzer Reference Agilent 70820A User-Corrections Example User-Corrections User corrections always contain at least two default lines of data, as shown in the following figure. While these two lines of data cannot be removed, you can modify their magnitude or phase values. New lines of ...

3-51 Eye-Diagram Analyzer Reference Agilent 70820A User-Corrections Default Data Enter user-correction data by: manually using front-panel keys or storing the results of a sweep to user-correction memory. To Enter the User Correction Menu Display the User Correction menu by pressing: MENU, page 1 of...

Eye-Diagram Analyzer Reference Agilent 70820A User-Corrections To Delete a Channel’s User-Corrections 1 Delete a channel’s user-corrections by pressing: MENU , page 1 of 2 , Calib, user corr 2 Select the desired channel by pressing: CH1|CH2 3 Delete the selected channels user-corrections by pressing...

3-53 Eye-Diagram Analyzer Reference Agilent 70820A User-Corrections The following two figures show the effect of selecting linear slope and flat types. The trace graphically shows the filter. With the exception of the path to next FREQ field, the data in each filter is identical.

Eye-Diagram Analyzer Reference Agilent 70820A User-Corrections To Enter a Line of Data 1 Enter a line of data by pressing: MENU , page 1 of 2 , Calib , user corr , SEL|EDT SEL New lines are added just above the highlighted line. Use the front-panel knob or arrow keys to highlight any field of the li...

3-55 Eye-Diagram Analyzer Reference Agilent 70820A User-Corrections To Edit a Line of Data 1 To edit a line of data, press: MENU , page 1 of 2 , Calib , user corr, SEL|EDT EDT Use the front-panel knob, step keys, or numeric keypad to change the dis-played value. 2 If you are editing the path to next...

Eye-Diagram Analyzer Reference Agilent 70820A User-Corrections To Copy User-Correction to Alternate Channel Copy user correction to an alternate channel by pressing: MENU , page 1 of 2 , Calib , user corr , other , copy to CH2 If channel 2 data is selected, the softkey reads copy to CH1. Viewing Use...

3-57 Eye-Diagram Analyzer Reference Agilent 70820A User-Corrections To View User-Corrections 1 To view user-corrections, press: MENU 2 To enter the Traces menu, press: Traces 3 Select a trace, and then press: input: 4 Use the front-panel knob to scroll the menu bar to UCORR1 , as shown in the follow...

Eye-Diagram Analyzer Reference Agilent 70820A User-Corrections 7 Set the frequency scale of the user-correction trace: • If the microwave transition analyzer is set for a frequency sweep, use the Main menu’s START and STOP softkeys. • If the microwave transition analyzer is set for a time sweep, pre...

Eye-Diagram Analyzer Reference Agilent 70820A User-Corrections To Recall a User-Correction File 1 To recall a user-correction file, press: MENU , page 1 of 2, States , more 1 of 2, mass storage If the mass-storage device needs to be selected, refer to “Selecting and Formatting Memory” on page 3-34 ....

3-61 Eye-Diagram Analyzer Reference Agilent 70820A Calibration Agilent 70820A Calibration Use the Calibration menu to perform the following tasks: • Match delay between channels. • Initiate an instrument self-test routine. • Turn off RF correction. • Calibrate the IF. • Verify the calibrator signal....

Eye-Diagram Analyzer Reference Agilent 70820A Calibration The Calibration Menu Turning Off RF Correction The microwave transition analyzer module applies RF correction factors to all measurements. These correction factors are loaded into nonvolatile memory at the factory . You can prevent the use of...

3-63 Eye-Diagram Analyzer Reference Agilent 70820A Calibration Matching Delay Between Channels Significant delays can occur between the signals on channel 1 and channel 2 when the electrical lengths of external cabling varies. This results in a phase offset between the two channels. The microwave tr...

Eye-Diagram Analyzer Reference Agilent 70820A Calibration Trace 2 Delay Compensated To Delay a Channel Automatically compensate channel 2 by pressing: MENU , page 1 of 2, Calib , chan skew , AUTO SKEW Calibrating the IF The microwave transition analyzer module provides separate automatic IF cal-ibra...

3-65 Eye-Diagram Analyzer Reference Agilent 70820A Calibration N o t e Warm up time Allow the microwave transition analyzer module to warm up for at least one hour before performing a calibration. To Calibrate the IF 1 Connect a low-loss cable between the front-panel CALIBRATOR OUTPUT and channel 1 ...

Eye-Diagram Analyzer Reference Agilent 70820A Calibration Viewing the Calibration Data The ability to view the IF calibration data is mainly intended for service pur-poses. However, the procedures in this section show you how to view the data. To View IF Correction Data Traces 1 Display the Traces m...

3-67 Eye-Diagram Analyzer Reference Agilent 70820A Calibration To View Hardware Response Traces 1 Display the traces menu by pressing: MENU , Traces 2 Turn on both trace 1 and trace 2. Set the input to trace 1 as channel 1. Set the input to trace 2 to channel 2. 3 Display the 100 kHz filter response...

Eye-Diagram Analyzer Reference Agilent 70820A Calibration 7 To display the various hardware responses, press: page 1 of 2, SHOW CAL Use the front-panel step keys to scroll through the various hardware responses. To View Calibration Data 1 Display the Traces menu by pressing: MENU , Traces 2 To make ...

3-69 Eye-Diagram Analyzer Reference Agilent 70820A Calibration 5 To view the data for channel 1, press: CH1 CAL INFO 6 To view the data for channel 2, press: CH2 CAL INFO 7 To view additional pages of information, continue pressing: CH1 CAL INFO or CH2 CAL INFO Performing a Self-Test You can initiat...

Eye-Diagram Analyzer Reference Agilent 70820A Calibration To Turn the Calibrator Signal On To turn the calibrator signal on, press: MENU , page 1 of 2 , Calib , cal signal, cal sig ON|OFF ON To Change the Calibrator Frequency and Amplitude To change the calibrator frequency and amplitude, press: MEN...

Programming Commands Programming Commands Programming Commands This chapter documents programming the eye-diagram analyzer. N o t e You will find the preview feature discussed in this chapter very useful. It displays the programming command corresponding to the response received when most softkeys a...

4-3 Programming Commands Introduction Introduction Before communicating with the eye-diagram analyzer application, the Instru-ment BASIC system must be queried for the name of the program and told we wish to communicate with this program. The following example shows how to do this. OUTPUT Mta;"P...

Programming Commands Introduction PROG:WAIT? query to indicate when the 70874C has paused. Then, retrieve the response using the PROG:STR? query. Use PROG:STATe to continue pro-gram execution. (Notice the lower case letter e in PROG:STATe. This indicates the this letter can be entered in either uppe...

4-5 Programming Commands Introduction BIT The BIT command string sets the instrument’s time scale (seconds-per-divi-sion) to a value which corresponds to the number of bits specified in the Param variable. Example OUTPUT Mta;"PROG:NUMB ’Param’,3.5" OUTPUT Mta;"PROG:STR ’Command’,’BIT’...

Programming Commands Introduction Example OUTPUT Mta;"PROG:STR ’Command’,’CLEAR’" OUTPUT Mta;"PROG:WAIT?" ENTER Mta;A$ OUTPUT Mta;"PROG:STR? ’Response’" ENTER Mta;Response$ OUTPUT Mta;"PROG:STAT CONT" DEFAULT The DEFAULT command string copies the default masks specifi...

4-7 Programming Commands Introduction DELAY The DELAY command string sets the displayed delay value to the number of bits specified in the Param variable. Example OUTPUT Mta;"PROG:NUMB ’Param’,2.75" OUTPUT Mta;"PROG:STR ’Command’,’DELAY’" OUTPUT Mta;"PROG:WAIT?" ENTER Mta;A$ ...

Programming Commands Introduction Example OUTPUT Mta;"PROG:STR ’Param’,’EYELINE’" OUTPUT Mta;"PROG:STR ’Command’,’DIAGRAM’" OUTPUT Mta;"PROG:WAIT?" ENTER Mta;A$ OUTPUT Mta;"PROG:STR? ’Response’" ENTER Mta;Response$ OUTPUT Mta;"PROG:STAT CONT" EXTIN The EXTIN c...

4-9 Programming Commands Introduction Example OUTPUT Mta;"PROG:STR ’Command’,’EXTIN’" OUTPUT Mta;"PROG:WAIT?" ENTER Mta;A$ OUTPUT Mta;"PROG:STR? ’Response’" ENTER Mta;Response$ OUTPUT Mta;"PROG:STAT CONT" MARGIN The MARGIN command string sets the margin percentage lim...

Programming Commands Introduction Example OUTPUT Mta;"PROG:STR ’Param’,’ON’" OUTPUT Mta;"PROG:STR ’Command’,’MARMSK’" OUTPUT Mta;"PROG:WAIT?" ENTER Mta;A$ OUTPUT Mta;"PROG:STR? ’Response’" ENTER Mta;Response$ OUTPUT Mta;"PROG:STAT CONT" MEAS The MEAS command s...

4-11 Programming Commands Introduction Example OUTPUT Mta;"PROG:STR ’Command’,’MEAS’" OUTPUT Mta;"PROG:WAIT?" ENTER Mta;A$ OUTPUT Mta;"PROG:STR? ’Response’" ENTER Mta;Response$ OUTPUT Mta;"PROG:STAT CONT" PERSIST The PERSIST command string controls persistence display...

Programming Commands Introduction Example OUTPUT Mta;"PROG:STR ’Param’,’COLGRAD’" OUTPUT Mta;"PROG:STR ’Command’,’PERSIST’" OUTPUT Mta;"PROG:WAIT?" ENTER Mta;A$ OUTPUT Mta;"PROG:STR? ’Response’" ENTER Mta;Response$ OUTPUT Mta;"PROG:STAT CONT" QUIT The QUIT com...

Specifications and Characteristics Specifications and Characteristics Specifications and Characteristics This chapter contains specifications and characteristics for the 71501C and 70874C Jitter and Eye Diagram Analyzer. Definitions of Terms The distinction between specifications, characteristics , ...

5-3 Specifications and Characteristics Vertical Specifications Vertical Specifications Table 5-1. Vertical Specifications Bandwidth (–3 dB): 20 GHz (extended BW off)40 GHz (extended BW on) dc accurachy (±5° C from cal): The larger of ±2% of signal ampltiude or 500 µVThe larger of ±1% of signal amplt...

Specifications and Characteristics Input Channel Specifications Input Channel Specifications C A U T I O N Input channels RF INPUT 1 and RF INPUT 2 are dc coupled. Table 5-2. Input Channel Specifications Operation input range: (including dc offset) <±320 mB Maximum safe input voltage without dama...

5-5 Specifications and Characteristics Trigger Specifications Trigger Specifications Table 5-3. Trigger Specifications Operation input range: (including dc offset) <±320 mV Maximum safe input voltage without damage ±2 V pk-pk Number of input channels: 2 Input connectors: a a. Includes two 2.4 mm ...

5-7 Specifications and Characteristics Horizontal Specifications Horizontal Specifications These specifications are for the eye diagram analyzer only. Table 5-5. Horizontal Specifications Time scale range: (full sclae is 10 divsions) 5 ps/div–100 s/div Delta time measurement accuracy: (whichever is ...

Specifications and Characteristics Declaration of Conformity Declaration of Conformity

Index-1 Index Numerics 0 level description , 3-4 1 Level description , 3-4 10 MHz reference , 1-11 70820A calibration , 3-61 70820A clock control , 3-21 70820A connections , 1-13 70820A menus , 3-14 70820A user-corrections , 3-49 70841A/B pattern generator , 1-24 A accessories , 1-15 accessories req...