Page 1 5120A / 5120A-01 / 5115A Phase Noise Test Set Operations and Maintenance Manual For Software Revision 276 and Above Part Number: DOC05120A, Rev M...
Page 2 5120A, 5120A-01, and 5115A Phase Noise Test Set (PNTS) Operations and Maintenance Manual Copyright © 2007-2009 Symmetricom Corporation. Other product and company names may be trademarks of their respective owners. DOC05120A Rev M Revision History: Revision Description Date Approved Initial Release 12/20/2004 GAR Updates for new software features.
Page 3: Table Of Contents
4.1.4 Viewing Version Information ..........29 5120A/5115A Operations and Maintenance Manual...
Page 4 4.1.5 Restoring Factory Default Settings......... 29 4.1.6 Upgrading the software via USB flash drive .
Page 5 8.1.1 5120A-01 Internal Reference Calibration ........72...
Page 6 Index Contents...
Page 7: 1: Introduction
THAT CARRY HAZARDOUS VOLTAGES. Universal Serial Bus (USB) port. Mains power on and off. Mains power is on when the button is in the depressed position and off when the button is in the out position. 5120A/5115A Operations and Maintenance Manual...
Page 8: About This Manual
1.2 About This Manual This manual describes how to set up, use, maintain, and troubleshoot a PNTS. The 5120A-01 is equipped with two internal reference oscillators that automatically serve as the reference signal when no external signal is connected to the Reference port. In this manual, the term “reference signal”...
Page 9: Conventions
Menu options to select Commands to type Non-variable information displayed in response to commands Italics Words in italics show: Names of windows and dialog boxes Variable information displayed in response to commands State information, label and button captions 5120A/5115A Operations and Maintenance Manual...
Page 10: Pnts Overview
(f) phase noise measurements. The 5120A and 5120A-01 also perform cross-correlation of the digitized signal from both input paths to provide the lowest possible noise measurement. The 5120A-01 features two built-in oscillators for applications where a reference signal is not available or required.
Page 11 Input signal, a clean and stable signal must be supplied to the Reference port of the PNTS. The 5120A-01 is equipped with two internal oscillators that can serve this function, to use internal reference signal, simply do not attach a a signal to the reference port.
Page 12 1: Introduction...
Page 13: 2: Setting Up A Pnts
2: Setting Up a PNTS You should read the safety information below before setting up the test set. For more information, see the following: “2.2 Setting Up a 5120A or 5115A” on page 7 “3: The Screen and Basic Concepts”...
Page 14 7. Connect another coaxial cable between the signal reference and the Reference input port of the test set. Skip this step if you intend to use internal reference available on the 5120A- 8. (Optional.) Connect a CAT 5 LAN cable to the Ethernet port on the rear panel of the test set.
Page 15: Turning On The Pnts
13) the instrument is ready for normal operation. • If the “Self test has failed for the following item(s)…” message displays, call Symmetricom Customer Assistance (see page 95). Once Ready is displayed in the status field, data can be collected. 2.2.2 Turning Off the PNTS There is a small chance that turning off the test set by removing the power cord could cause the operating system files to be corrupted.
Page 16 2: Setting Up a PNTS...
Page 17: 3: The Screen And Basic Concepts
Frequency and power of input signals User specified title Figure 3: Default Main Screen Note When the 5120A-01 is used with internal references, the Reference field reads “Internal”, and frequency and power are not shown. 5120A/5115A Operations and Maintenance Manual...
Page 18: Softkey Interface
3.1 Softkey Interface The column labeled “softkeys” in Figure 3 mirrors the set of buttons on the test set front panel (Figure 1 on page 4 shows them side by side). The labels indicate the effect pressing the corresponding button will have. The function of a softkey changes depending on previous selections including navigation and settings.
Page 19: Manual Convention For Navigation Instructions
When no reference signal is attached to the 5120A-01, the Reference field reads “Internal”, color coded in blue, as internal reference signals are within operating range unless the test set is damaged.
Page 20: User In Control
The screen always shows the currently connected signals’ frequency and power. When a data set is printed, the frequency and power at the time the printed data set was collected is output. If data are collected with 5 MHz signals on both ports, and the reference is replaced with a 10 MHz signal, the screen shows 5 and 10 MHz, while a printout correctly shows 5 MHz for both signals.
Page 21: Types Of Screens
Input components are used to interface with and make these settings. Components for related parameters are often grouped, as multiple parameters affect a certain function. Examples of such groups can be found in chapter “4: Global System Settings” on page 21 and its subsections. 5120A/5115A Operations and Maintenance Manual...
Page 22: Parameters, Input Components And Editors
3.4 Parameters, Input Components and Editors This section explains the possible parameter types and cross references an example of each. The components which represent them, and how each type can be modified using the softkey interface, a mouse or a keyboard, are detailed in the section referenced by each type. Parameters fall into these categories: “3.4.1 Numeric Parameters”...
Page 23: The Number Pad Editor
To commit the new Backspace erases the last digit. parameter value you entered, press Apply. Clear erases entire value. Press Cancel to discard your edits and leave the parameter unchanged. Figure 6: The Number Pad Editor 5120A/5115A Operations and Maintenance Manual...
Page 24: The + And - Integer Parameter Interface
3.4.1.2 The + and - Integer Parameter Interface Numeric parameters whose values are confined to the integer domain can be changed by incrementing and decrementing their values. They are represented by spin buttons. See “Figure 5: Spin Buttons” on page 16 for an example. When an interactive component that represents such a value is selected, the softkey interface offers both the number pad and the + and - interface as an editor: When a spin button is selected, both...
Page 25 Note that the buttons representing the options can be clicked directly with a mouse. Clicking an interactive component moves the focus - it does not have to be moved with the arrow softkeys. 5120A/5115A Operations and Maintenance Manual...
Page 26 3: The Screen and Basic Concepts...
Page 27: 4: Global System Settings
Figure 8: Settings Screen Note that the Settings screen displays the instrument’s current IP address. Use this address to access the command and data ports, or to retrieve print jobs that were written to files. 5120A/5115A Operations and Maintenance Manual...
Page 28: Setting Date And Time
4.1.1 Setting Date and Time All printouts produced by the test set show the test set date and time the print job was initiated. The date and time is printed in the top left corner of the page. Date and time stamps on printouts can be used to correlate printed data sets.
Page 29: Network Configuration
The network features can be used on the local area network, even if no default route (specified as 0.0.0.0) is configured. 5120A/5115A Operations and Maintenance Manual...
Page 30 The command and data ports can also be changed if the default port numbers conflict with other ports on the network. They are used to remotely control the test set and access collected data. To configure the network connection with a static IP address: 1.
Page 31: Dhcp Network Configuration
PNTS that can detect carrier, display either “no carrier” or “active” in the Ethernet Carrier field on the Settings screen. PNTS which cannot detect carrier always display “unknown” in the Ethernet Carrier field. 5120A/5115A Operations and Maintenance Manual...
Page 32: Printer Configuration
4.1.3 Printer Configuration Whenever the Print button on the front panel is pressed, or print commands arrive on the network command interface, the 5120A or 5115A prints to the current print job destination in the current format. The test set can print plots, tables and the settings screen in two formats: PCL5 - Printer Control Language 5 format which PCL5-capable printers will accept.
Page 33 Local destination in the format the printer supports. 2. Print the data sets of interest using the methods described in sections “6.2 Printing” page 54 and “7.2.4 Printing from the Command Port” on page 60. 5120A/5115A Operations and Maintenance Manual...
Page 34: Printing To Files
4.1.3.2 Printing to Files When the test set is configured to print to files, output that is normally sent to a USB or network printer is stored on its file system instead. The test set will store up to fifteen print jobs. Jobs are numbered starting at zero.
Page 35: Configuring Network Printers
Parameters configured using the Settings submenus persist when the test set is power cycled. Other settings such as the frequency counter’s user supplied reference frequency and test masks also persist. All persisted settings can be reset to the values the 5120A or 5115A was shipped with, using the following steps.
Page 36: Upgrading The Software Via Usb Flash Drive
Software versions TS-2-7-9-2 and above can be upgraded using a USB flash drive. To perform the upgrade: 1. Install the new software image supplied by Symmetricom on a USB flash drive and install it in one of the USB ports on the rear panel of the unit 2.
Page 37: 5: Configuring Data Displays
5.1 Configuring Phase Noise Plot The 5120A and 5120A-01display (f) phase noise data out to 1 MHz, provided neither the input nor reference signal is below 2 MHz. The 5115A displays data out to 100 kHz. This data shows the (f) spectrum of the phase differences between the Input and Reference signals.
Page 38 Older data display in green. Spurs display in red, even if part of new data. New data display in magenta. The region below the measurement Time constant shows the current noise floor shaded gray. spectrum averaging interval. Figure 9: Example Phase Noise Plot The lower portion of the graph is shaded to the level of instrument noise that produces an imaginary result from cross-correlation.
Page 39: Scaling The Phase Noise Plot
, and 10 Note The 5120A-01 cannot measure phase noise at offset frequencies greater than 100 kHz when either of the signals connected to the front panel signal input ports has a frequency less than 2 MHz. When signals with lower frequencies are attached, the plot can still be scaled to include the 1 MHz offset frequency, but no data will be plotted from 100 kHz to 1 MHz.
Page 40 2. Press Config Phase Noise. 3. Press Scale Plot. The highlighted softkeys show whether each axis is auto scaled or in fixed scale mode. To auto scale an axis, press Auto Scale X Axis or Auto Scale Y Axis. To manually scale an axis, press one of the following: •...
Page 41: Setting Data Markers
Printouts have a much higher resolution and the marker coordinates are printed below the main title instead of obscuring it. 5120A/5115A Operations and Maintenance Manual...
Page 42 Normal marker’s coordinates Delta marker’s coordinates Difference between display in white color. display in orange color. marker coordinates Delta marker and its Mouse cursor spur information window display in orange color. Normal marker and its spur information window display in white color.
Page 43 The marker follows this measurement. When a measurement at (or below) 0.012 Hz is available the marker stops moving in frequency and begins to continually follow the 0.012 Hz measurement. Note Markers can also be placed on a specific spur’s frequency using the Spur Table. For more 5120A/5115A Operations and Maintenance Manual...
Page 44: Setting Up A Test Mask
information on how to do so see “5.1.5 The Spur Table” on page 42. 5.1.3 Setting Up a Test Mask Test masks display a visual fail level reference line for phase noise data. A test mask is a set of line segment end points that are scaled as data points are.
Page 45 Cancel to cancel point addition. If the first coordinate was applied, the number pad editor is displayed for the second coordinate. • Enter the dBc/Hz coordinate for the new point and press Apply, or press Cancel 5120A/5115A Operations and Maintenance Manual...
Page 46 to cancel the addition. If addition was not cancelled, the table lists the new point. 4. Use the arrow softkeys to highlight a point to edit. 5. Press Edit Point. Tip: Steps 4 and 5 can be combined by double clicking the point to be edited with a mouse.
Page 47: Display Tools
They remain blank for a brief period - until measurements using the new time constant become available. Data sets in the phase and frequency difference plots and the frequency counter continue to be maintained without interruption. 5120A/5115A Operations and Maintenance Manual...
Page 48: The Spur Table
To set the time constant: 1. Select the Phase Noise Plot (see “3.1.1 Navigation” on page 12 for details). 2. Press Config Phase Noise. 3. Press Display Tools. 4. Press Time Constant to access a soft key menu that enumerates the valid settings. •...
Page 49: Configuring The Allan Deviation Plot
(same area under the curve). The 5120A and 5120A-01 perform cross-correlation. They are able to compute the noise floor and shade the region below the measurement noise floor in gray.
Page 50: Selecting Τ
Use Inc Min or Dec Min to increase or decrease the minimum scale value. Use Inc Max or Dec Max to increase or decrease the maximum scale value. Note The Allan deviation plot can be scaled using the zoom feature described for the phase noise plot. “...
Page 51: Configuring The Phase Difference Plot
Measure Linear softkey. The slope of this line segment (from the first to the last available measurement) is taken into consideration when the trend is measured. 5120A/5115A Operations and Maintenance Manual...
Page 52 Figure 13: Linear Trend in Phase Difference Measurements Make the following observations about Figure 13 Linear Trend in Phase Difference Measurements: Region 1 contains measurements which fall below the trend line, and reach the trend line towards the end of the region. Region 2 contains measurements near or on the trend line segment.
Page 53 Pressing the Remove Linear softkey essentially plots the phase difference measurements' distance from the trend last measured by the Measure Linear softkey. The top and bottom most grid lines Figure 14 Linear Trend Removed are parallel to the linear trend line segment in Figure 13 5120A/5115A Operations and Maintenance Manual...
Page 54: Pausing Or Resuming Updates
Linear Trend in Phase Difference Measurements, as depicted in Figure 15 Conceptual Representation of Figure 14 Linear Trend Removed in terms of Figure 13 Linear Trend in Phase Difference Measurements.: Figure 14 Figure 13 Figure 15: Conceptual Representation of Linear Trend Removed in terms of Linear Trend in Phase Difference Measurements.
Page 55: Scaling The Frequency Difference Plot
Frequency value may be displayed as “not yet set” until data collection begins, then the frequency of the Reference port signal is displayed. In the internal reference mode of the 5120A-01, the Reference Frequency displays as Internal indicating that the internal oscillators are used. In this mode, a message about the accuracy of absolute frequency averages is displayed (and printed) below the frequency counter table.
Page 56: Changing The Reference Frequency
The frequency used to compute frequency averages when an external reference signal (optional on 5120A-01 using the internal reference) is used can be set in one of two ways: Automatically - The test set uses the Reference signal’s measured frequency.
Page 57: Automatically Setting The Reference Frequency
The reference frequency can be changed while the test set is in Collecting state on all models. New settings are immediately used to recompute frequency averages. On the 5120A-01, the automatic and manual reference frequency settings are applicable only when an external reference is used. The reference frequency can be configured while in internal reference mode.
Page 58 2. Press Config Freq Counter. 3. Press Enter Reference Freq. The Reference Frequency number pad editor displays. 4. Enter the new reference frequency (in MHz). “3.4.1.1 The Number Pad Editor” on page 17 for help with entering numbers. The table of frequencies updates with calculations using the new frequency. The instrument retains the manually set reference frequency until a new one is entered or automatic setting is selected.
Page 59: 6: Collecting And Viewing Data Locally
To start data collection: 1. Ensure that the reference signal source is connected to the Reference connector (optional for 5120A-01) and the DUT (device under test) is connected to the Input connector on the test set. For more information, see “2.2 Setting Up a PNTS”...
Page 60 Note The most recent data is retained on all screens until a new data collection starts or the instrument is powered off. 6: Collecting and Viewing Data Locally...
Page 61: Printing
3. Press the down arrow softkey until Cancel Print Jobs button is highlighted. The softkey interface displays a PUSH softkey. 4. Press PUSH to push the Cancel Print Jobs button. 5. Press Return to return to the previous screens. 5120A/5115A Operations and Maintenance Manual...
Page 62: Taking Or Yielding Local Control
6.3 Taking or Yielding Local Control. Please see “3.2.3 User in Control” on page 14 for an introduction about the user in control of the test set. To take Local control of the test set: 1. Perform an operation that requires control. Start or Stop data collection for example. The reminder dialog stating that local control of the test set is required offers the opportunity to take local control.
Page 63: 7: Collecting And Viewing Data Remotely
The input and reference signals’ frequency and power. • The current collecting state. Set the User Specified Title (see page 64). Retrieve version information (see page 64). Calibrate internal reference oscillators of a 5120A-01 (see page 73). 5120A/5115A Operations and Maintenance Manual...
Page 64: Accessing The Pnts Remotely And Exiting The Remote Session
7.1 Accessing the PNTS Remotely and Exiting the Remote Session Before Ethernet connections to either the command or the data port can be made, their port numbers and the test set’s IP address must be known. See “4.1.2 Network Configuration” page 23 to learn how to configure them or check their current values.
Page 65: Starting And Stopping Data Collection
The data sets returned contain the most recent data (unless they are paused). Running the same show <datasetname> command at a later time will return the most recent data set at that point in time. 5120A/5115A Operations and Maintenance Manual...
Page 66: Printing From The Command Port
τ value and the input filter’s noise equivalent bandwidth. On the 5120A and 5120A-01, the corresponding noise floor is returned after each table. When all tables have been returned, the command prompt is displayed again. Use the show phasediff command to retrieve the one second phase difference strip chart data. The test set outputs a header.
Page 67: Printer Configuration From The Command Port
<formatname> Where <formatname> is one of the possible formats returned by the show printformats command. The valid <formatname> values are: pcl5 and postscript. To print in postscript format enter: set print format postscript 5120A/5115A Operations and Maintenance Manual...
Page 68: Configuring Data Sets From The Command Port
To change where print jobs are sent, use the following variations of the set print command: set print local set print file set print remote <hostaddr> <port> These commands change print job destination to that indicated by their last parameter. The last variation requires IP address and port number of a network printer that supports direct transfer of information to the port, such as the HP JetDirect using port 9100.
Page 69: Setting The Allan Deviation Τ Value
The reference frequency is applicable only to external signals connected to the Reference port, it does not affect the reference frequency used in the internal reference mode featured by the 5120A- 01. The set referencefreq command can be sent while a 5120A-01 is operating in internal reference mode, it will take effect the next time data is collected using an external reference signal.
Page 70: Setting The User Specified Title
To see the input frequency and power of the signals attached to the test set, enter show inputs. The test set responds with two sets of frequency and amplitude values for the signals connected to input and reference port: Frequency and amplitude of the currently connected signals. Frequency and amplitude of the signals against which the most recent (or current) data collection was run.
Page 71: Setting Data Port Output Rate
Restores all persistent settings to factory default values and reboots the test set. See “4.1.5 Restoring Factory Default Settings” on page 29 for more information about persistent settings. set <option> <args> date options: set date YYYYMMDDhhmmss 5120A/5115A Operations and Maintenance Manual...
Page 72: Command Summary
Simulates a front panel button press. calibrate Calibrates 5120A-01 internal reference oscillators. calinfo Returns current 5120A-01 internal reference calibration data. control Takes or yields remote control of the test set. help Display help for a command, or list all commands.
Page 73: The Network Data Port
1, 10, 100, or 1000 samples each second. The default rate is 1000 samples per second, to change the rate use the set phaserate command. See “Chapter 7, Setting Data Port Output Rate” on page 65. 5120A/5115A Operations and Maintenance Manual...
Page 74 The data port accepts no input, all input to data port connections is discarded by the PNTS. Phase difference measurements are published while the test set is in the Collecting state. See “3.2.1 Collecting State” on page 13. When data collection is stopped or the test set is in the Initializing state, no data is published.
Page 75: 8: Optional Functionality
50 / SQRT(3) constant con * | meas_freq - desired_freq | / desired_freq jitter from frequency error meas_random_jitter_RMS / (2 * Π * desired_freq) jitter from random variations Total Jitter pass/fail criterion SQRT(J1 + J2 5120A/5115A Operations and Maintenance Manual...
Page 76: Using The Docsis Option Locally
8.0.2 Using the DOCSIS Option Locally Figure 17 shows the DOCSIS option screen after it has calculated total jitter for a set of input signals. The signals PASSED because total jitter was less than 1.5 ns. Use these softkeys to enter the M and N values for the M/N ratio used for the test.
Page 77: Using The Docsis Option Remotely
Once M and N values have been set as parameters to the docsis network command or in the user interface, they can be reused by omitting the parameters from the command. To use current M, N and reference frequency values for the test simply enter: docsis 5120A/5115A Operations and Maintenance Manual...
Page 78: 5120A-01 Internal Reference
8.1.1 5120A-01 Internal Reference Calibration The 5120A-01 is calibrated before it is shipped from the factory. The frequency of the internal oscillators must be measured and calibration values entered annually. See section 8.2.1.1 for details on performing the calibration.
Page 79: Calibrating 5120A-01 Internal Reference Remotely
Remote Session” on page 58. 2. Issue the calinfo command. The 5120A-01 returns date and time of calibration and the calibrated frequencies of both internal reference oscillators. To calibrate the internal reference oscillators remotely: 1. Detach any signal connected to the Reference port.
Page 80 6. Issue the calibrate command. If calibrated frequencies cannot be calculated at the time the calibrate command is issued the 5120A-01 responds with the reason for the failure. If the command does not cause a response, calibration was successful. 7. Use the calinfo command to verify the newly calibrated frequencies.
Page 81: 9: Maintaining A Pnts
A performance verification procedure is available from Symmetricom to enable a customer or calibration lab to perform the calibration. Contact Symmetricom Customer Assistance (see page 95) for pricing or to obtain the performance verification procedure. For information about calibrating the 5120A-01 internal reference oscillators see “8.1 5120A-01...
Page 82 9: Maintaining a PNTS...
Page 83: 10:Troubleshooting
Perform all of the following procedures before returning the test set for service. If the test set still appears to have a problem, call Symmetricom Customer Assistance (see page 95) to obtain technical support. Please be prepared to provide the representative with the number of your instrument.
Page 84: Troubleshooting Error Messages
2. Do not bump or otherwise disturb the test set or the connected signals. 3. Do not change the input or reference port signals’ amplitude during data collection. 4. Contact Symmetricom Customer (see page 95) Assistance if the problem persists. Failed to connect to printer A connection could not be established 1.
Page 85 Information in this dialog message. is useful to the software developers. UI Initialization File: sourcecode.cc Line: 150 Errno 2: ENOENT Msg: Example error. Retaddrs: 0x80ff490 0x80ddb60 0x80dc0b0 5120A/5115A Operations and Maintenance Manual...
Page 86: Replacing Fuses
10.2 Replacing Fuses If you know that a local event caused blown fuses, you can replace the fuses in the test set power entry module on the rear panel. See “Figure 2: Rear Panel” on page 5. Required for this procedure: Small flat-head screwdriver Replacement fuse for a standard IEC 320 power entry module with fuse (250-volt, 1-amp, time delay, 5 x 20 mm fuse, T)
Page 87: Appendix A: Specifications
The unit complies with all essential requirements of the Directives. Signed by: S.R. Stein Position: Vice President of Engineering, TTM Division Done at Boulder, Colorado U.S.A on 02 February 2008 5120A/5115A Operations and Maintenance Manual...
Page 88: Electrical Specifications
A.2 Electrical Specifications Table A-1 lists the electrical specifications for the 5120A, 5120A-01, and 5115A. Table A-1: Electrical Specifications Item Specification Protection Class Class I (Grounded Type) Power Input Voltage 100–240 V AC Note: Fluctuations not to exceed ± 10% of nominal supply voltage.
Page 89 4E-13 at 10 seconds, 0.5 Hz bandwidth less than 1E-12 at 100 seconds, 0.5 Hz bandwidth less than 1E-11 at 1,000 seconds, 0.5 Hz bandwidth Table A-4: 5120A-01 Phase Noise Specifications (Internal Reference) Offset 10 MHz Input 5 MHz Input...
Page 90: Environmental Specifications
Pollution Degree 2 per EN61010-1EN 61010-1 Installation (Over-Voltage) Category II for transient over-voltages per EN 61010-1EN 61326-1, Class A Equipment suitable for continuous operation Table A-5 lists the environmental specifications for the 5120A, 5120A-01, and 5115A. Table A-5: Environment Specifications Item Temperature Relative Humidity...
Page 91: Physical Specifications
A.4 Physical Specifications Table A-6 lists the physical specifications for the 5120A, 5120A-01, and 5115A. Table A-6: Physical Specifications Item Specification Size 33.8 cm x 17.4 cm x 43.7 cm (13.31" x 6.84" x 17.21") Weight 5120A: Approximately 9.1 kg (20 pounds) 5115A: Approximately 8.4 kg (18.5 pounds)
Page 92 Appendix A: Specifications...
Page 93: Appendix B: Theory Of Operation
1.F. L. Walls, S. R. Stein, James E. Gray, and David J. Glaze, “Design Considerations in State-of-the-Art Sig- nal Processing and Phase Noise Measurement Systems,” Proceedings of the 30th Annual Frequency Control Symposium, 1976, pp 269-274. 5120A/5115A Operations and Maintenance Manual...
Page 94: Theory
The concept for direct-digital phase-noise measurements is shown in Figure B-2. Analog/Digital Input Converter Digital Signal Processing Analog/Digital Reference Converter Figure B-2: The RF signals are immediately converted to digital samples in order to perform direct-digital phase-noise measurements. B.2 Theory The analog-to-digital converters have 14 bits of precision and maximum sampling rates of 80 MHz.
Page 95 Conjugate Φ ∗ Φ ∗ Φ ∗ Φ ∗ – – ADC1 ADC2 Figure B-5: 5115A: The power spectral density of the phase is computed by multiplying the phase by its complex conjugate and averaging 5120A/5115A Operations and Maintenance Manual...
Page 96 – ADC1B ADC2B Figure B-6: 5120A and 5120A-01 with external reference: The PSD is computed as the cross-spectrum of the DFTs from two identical processing front ends. The 5120A-01 computes the cross-spectrum of two identical measurement systems as shown in Figure B-7.
Page 97: Measurement Methodology
Figure B-8: 5120A: Successive Filter-decimate-transform Signal Processing Stages The spectrum estimation process for all unit types is broken into a series of spans that have appropriate frequency resolution (DFT length). The process, as performed in the 5120A and 5120A-01 with cross-correlation, is shown in Figure B-8.
Page 98 Appendix B: Theory of Operation...
Page 99: Glossary
Downstream RF Interface Digital Signal Processor DOCSIS Timing Interface device under test EQAM Edge Quadrature Amplitude Modulation electrostatic discharge File Transfer Protocol Internet Printing Protocol NEQBW Noise equivalent bandwidth Printer Control Language single side band Universal Bus 5120A/5115A Operations and Maintenance Manual...
Page 101: Symmetricom Customer Assistance
Symmetricom Customer Assistance Symmetricom's Customer Assistance Centers are a centralized resource to handle all of your customer needs. Customer Assistance Center Telephone Numbers: • Worldwide (Main Number): 1-408-428-7907 • USA, Canada, Latin America including Caribbean, Pacific Rim including Asia, Australia and New Zealand: 1-408-428-7907 •...
Page 103 59 using DHCP 23 date setting locally 22 using static 24 ipn - see integrated phase noise setting remotely 65 Default settings, restoring locally 29 settings, restoring remotely 65 LAN port DHCP connecting to 7 5120A/5115A Operations and Maintenance Manual97...
Page 104 18 Restoring factory default settings locally 29 factory default settings remotely 65 running average network length, see time constant accessing the 5120A using 58 configuring 23 connecting to 7 Network printer safety instructions 7 printing to 29 Scaling...
Page 105 78 data remotely 67 troubleshooting procedures 77 help for remote commands 64 turning on the test set 9 list of remote commands 64 typographic conventions 3 yielding control - see control 5120A/5115A Operations and Maintenance Manual99...

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Symmetricom 5120A Operation And Maintenance Manual

1 : Introduction

2 : Setting up a PNTS

3 : the Screen and Basic Concepts

4 : Global System Settings

5 : Configuring Data Displays

6 : Collecting and Viewing Data Locally

7 : Collecting and Viewing Data Remotely

8 : Optional Functionality

9 : Maintaining a PNTS

10 :Troubleshooting

Appendix A: Specifications

Appendix B: Theory of Operation

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