Agilent Technologies U8903A User Manual
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Agilent Technologies U8903A User Manual

Agilent Technologies U8903A User Manual

Audio analyzer
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Agilent U8903A 

Audio Analyzer

User's Guide
Agilent Technologies

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Summary of Contents for Agilent Technologies U8903A

  • Page 1: Audio Analyzer

    Agilent U8903A  Audio Analyzer User’s Guide Agilent Technologies...

  • Page 2: Safety Notices

    Notices Warranty Safety Notices © Agilent Technologies, Inc. , 2009 - 2010 No part of this manual may be reproduced in The material contained in this docu- any form or by any means (including elec- ment is provided “as is,” and is sub-...

  • Page 3: Safety Symbols

    Caution, risk of danger (refer to this manual for specific Warning or Caution information) Protective conductor terminal Caution, hot surface Frame or chassis terminal Out position of a bi-stable push control Equipotentiality In position of a bi-stable push control U8903A User’s Guide...
  • Page 4 Agilent Technologies, Inc. assumes no liability for the customer’s failure to comply with these requirements. • Ground the equipment....
  • Page 5 • Observe all markings on the device before establishing any connection. • Always use dry cloth to clean the device. Do not use ethyl alcohol or any other volatile liquid to clean the device. • Do not permit any blockage of the ventilation holes of the device. U8903A User’s Guide...

  • Page 6: Environmental Conditions

    –40 °C to 70 °C Storage humidity 30% to 80% RH noncondensing at 65 °C The U8903A audio analyzer complies with the following safety and EMC C A U T I O N requirements. • IEC 61010-1:2001/EN 61010-1:2001 (2nd Edition) •...
  • Page 7 Cet appareil ISM est confomre a la product label indicates that you must norme NMB-001 du Canada. not discard this electrical/electronic product in domestic household waste. The CSA mark is a registered trademark of the Canadian Standards Association. U8903A User’s Guide...
  • Page 8 “Monitoring and Control Instrument” product. The affixed product label is shown as below. Do not dispose in domestic household waste To return this unwanted instrument, contact your nearest Agilent Technologies, or visit: www.agilent.com/environment/product for more information. VIII U8903A User’s Guide...
  • Page 9 U8903A, such as test capabilities, key features, and front panel menu operation. Instrument Configuration This chapter guides you through the configuration of the U8903A input and output settings for optimum measurement results. Audio Generator Functions This chapter provides you the information on the audio generator functions and settings of the U8903A.
  • Page 10 4-May-2009 Tay Eng Su Date Quality Manager For further information, please contact your local Agilent Technologies sales office, agent or distributor, or Agilent Technologies Deutschland GmbH, Herrenberger Straße 130, 71034 Böblingen, Germany. Template: A5971-5302-2, Rev. E00 U8903A DoC Revision A...
  • Page 11 Regulatory Information for Canada ICES/NMB-001:2004 This ISM device complies with Canadian ICES-001. Cet appareil ISM est confomre à la norme NMB-001 du Canada. Regulatory Information for Australia/New Zealand This ISM device complies with Australian/New Zealand AS/NZS CISPR11:2004 U8903A User’s Guide...
  • Page 12 U8903A User’s Guide...

  • Page 13: Table Of Contents

    Product Dimensions Standard Accessories Optional Accessories Installation and Configuration Initial inspection Ventilation Rack mounting Maintenance Fuse removal/replacement Power On the U8903A Preset Help System Operation and Features Test Capabilities Key Features Remote interface Sweep function Frequency domain analysis Digital filters Front Panel Operation U8903A User’s Guide...
  • Page 14  Mode Graph functions Run/Stop and On/Off System Front Panel LCD Display Editing Keys Instrument Configuration U8903A Block Diagram Input Settings AC/DC coupling AC level detection Digital filters Input configuration Input ranging Common Settings Measurement bandwidth Measurement time Trigger Output Settings...
  • Page 15 Crosstalk (channel driven and channel measured) Frequency and Time Domain Analysis Frequency Domain and Time Domain Monitor settings Input settings Axis settings Harmonics display Graph Functions Peak search Marker Marker –> Full screen Sweep Function Sweep Sweep mode U8903A User’s Guide...
  • Page 16 Measurement Category Measurement category definitions Index Appendixes Appendix A: SMPTE IMD and DFD Default Settings Appendix B: Arbitrary File Format Appendix C: User-defined Filter File Format Appendix D: User-defined Sweep Points File Format Appendix E: Spot Parameters U8903A User’s Guide...
  • Page 17 Run/Stop or On/Off option Figure 2-12 Channel selection and status Figure 2-13 System panel Figure 2-14 File Manager menu for saving the U8903A state Figure 2-15 File Manager menu for recalling the U8903A state Figure 2-16 Analyzer 8-channel display Figure 2-17...
  • Page 18 Analyzer menu functions Figure 5-2 Function 1 selection Figure 5-3 Function 2 selection first page Figure 5-4 Function 2 selection second page Figure 5-5 Function 2 selection third page Figure 5-6 Function 2 selection fourth page XVIII U8903A User’s Guide...
  • Page 19 Full screen Figure 7-1 Sweep menu first page Figure 7-2 Sweep menu second page Figure 7-3 Sweep mode selection Figure 7-4 Sweep settings page Figure 7-5 I/O settings page Figure 7-6 Axis settings page Figure 7-7 List View U8903A User’s Guide...
  • Page 20  U8903A User’s Guide...

  • Page 21: List Of Tables

     List of Tables Table 1-1 U8903A front panel description Table 1-2 U8903A rear panel description Table 1-3 Power cord types Table 2-1 Mode panel key description Table 2-2 Generator menu description Table 2-3 Analyzer menu description Table 2-4 Graph (frequency/time domain) menu description...
  • Page 22  XXII U8903A User’s Guide...

  • Page 23: Getting Started

    Product Dimensions Standard Accessories Optional Accessories Installation and Configuration Initial inspection Ventilation Rack mounting Maintenance Fuse removal/replacement Power On the U8903A Preset Help System This chapter provides an overview of the outlook and installation of the U8903A audio analyzer. Agilent Technologies...

  • Page 24: Introduction

    The U8903A can be configured for up to eight channels, however this feature is only applicable in future releases. The U8903A is provided with a set of features as listed below which allows you to perform a wide range of audio parameter measurements.
  • Page 25 Getting Started 1 The U8903A audio analyzer has a frequency measurement range of 10 Hz to 100 kHz, as well as an amplitude measurement range of microvolts to 200 Vp (140 Vrms). Below is the list of the audio analyzer features.

  • Page 26: Lxi Class-C Compliant Audio Analyzer

    Getting Started  LXI Class-C Compliant Audio Analyzer The U8903A audio analyzer is an LXI Class C compliant instrument, developed using LXI Technology. LXI, an acronym for LAN eXtension for Instrumentation, is an instrument standard for devices that use the Ethernet (LAN) as their primary communication interface.

  • Page 27: Product At A Glance

    Getting Started 1 Product at a Glance Product outlook Front panel Figure 1-1 U8903A front panel Table 1-1 U8903A front panel description Item Display Description LCD display Provides information on the current function including status indicators, settings, and error messages...
  • Page 28 You can also use the Full Screen function to maximize the display area. Mode Enables access to the U8903A core functions Data Entry Contains alphanumeric and editing keys to enter values or text, or modify the values or data and confirm an entry...

  • Page 29: Figure 1-2 U8903A Rear Panel

    Used to connect a USB external flash storage for data transfer. You can connect or disconnect the USB external flash storage without shutting down or restarting the U8903A. Headphone jack The headphone jack will only be applicable in future releases Rear panel Figure 1-2 U8903A rear panel U8903A User’s Guide...

  • Page 30: Table 1-2 U8903A Rear Panel Description

    Allows communication with the PC via a USB cable LAN interface Allows Ethernet LAN communication through a 10/100 Base-T LAN cable. VGA interface Allows the U8903A to be connected to an external monitor Fuse Fuse compartment for AC supply AC power Receptacle for AC line voltage connection...

  • Page 31: Product Dimensions

    Getting Started 1 Product Dimensions Top view 426.80 mm 405.00 mm Front view 141.35 mm U8903A User’s Guide...

  • Page 32: Standard Accessories

    Getting Started  Standard Accessories Verify that you have received the following items with your U8903A. If anything is missing or damaged, please contact the nearest Agilent Sales Office. • Power cord • LAN cable • USB cable • USB flash storage device •...

  • Page 33: Installation And Configuration

    Ventilation The U8903A can operate within the temperature range of  0 °C to 55 °C. The U8903A is cooled by drawing air through the sides and rear and exhausting it through the ventilation holes on the top, sides, and rear. The U8903A must be installed in a location that allows sufficient space at the top, sides, and rear for adequate air circulation.

  • Page 34: Maintenance

     Maintenance Fuse removal/replacement This section contains the information for replacing the U8903A rear panel AC line fuse. Ensure that you are using the quick-acting, low-breaking capacity  N O T E 5 A/250 V fuse. Perform the following procedure to replace the fuse.

  • Page 35: Power On The U8903A

    Getting Started 1 Power On the U8903A Connect one end of the power cord to the U8903A rear panel AC power inlet, and the other end to an AC voltage source. Ensure that the provided power cord matches the country of origin as shown in the table below. The U8903A will automatically adjust to the correct line voltage in the range of 100 Vac to 240 Vac.

  • Page 36: Preset

    A preset does not erase the flash memory, state memory, or I/O configuration. A preset will delete all customized settings on the U8903A. To preset the U8903A, you can perform either one of the following steps. • Send the *RST, SYSTem:PRESet,...

  • Page 37: Help System

    To activate the help mode, press . To deactivate, press When Help is enabled, the function keys will not execute their normal functions when pressed. An example of a help dialog information is shown as follows. Figure 1-3 Help dialog information example U8903A User’s Guide...
  • Page 38 Getting Started  U8903A User’s Guide...

  • Page 39: Operation And Features

    Front Panel Operation Mode Graph functions Run/Stop and On/Off System Front Panel LCD Display Editing Keys This chapter describes the operation and features that are offered by the U8903A, such as test capabilities, key features, and front panel menu operation. Agilent Technologies...

  • Page 40: Test Capabilities

    U8903A to test devices with stereo capability. The U8903A audio generator has a frequency range of 5 Hz to 80 kHz. Its sine waveform amplitude range is from  0 Vrms to 8 Vrms (11.3 Vp) for the Unbalanced or Common mode test output configuration, and 0 Vrms to 16 Vrms ...
  • Page 41 (DFD) waveform types • Multitone generation • User- defined arbitrary waveform The U8903A audio analyzer has a frequency measurement range of 10 Hz to 100 kHz, as well as an amplitude measurement range of microvolts to 200 Vp (140 Vrms).

  • Page 42: Key Features

    Operation and Features  Key Features The key features of the U8903A are described as follows. Remote interface The U8903A supports three types of industry standard interfaces for measurement automation as follows. • GPIB • LAN • USB These three interfaces make the U8903A a highly flexible instrument.

  • Page 43: Digital Filters

    Operation and Features 2 Digital filters The U8903A has a series of filters that are implemented digitally. They consist of low pass, high pass, and weighting filters such as CCITT, CCIR, C- Message, and A- Weighting. The U8903A also allows user- defined filters to be uploaded to the device.

  • Page 44: Front Panel Operation

    The front panel keys are organized in groups based on their functions as follows. • Mode • Graph • System • Softkeys • Controls • Data Entry • Navigation keys • Knob Mode This group provides quick access to the main functions. Figure 2-1 Mode panel U8903A User’s Guide...

  • Page 45: Table 2-1 Mode Panel Key Description

    Noise, DC, Multitone, Square, and Arbitrary. The third section of the menu tree displays the Output Settings, Frequency, Amplitude, and DC Offset functions. Use the softkey on the right side of the LCD display to navigate to the next menu level. U8903A User’s Guide...

  • Page 46: Figure 2-2 Generator: Waveform (Sine, Variable Phase, And Dual Sine)

    You are only allowed to set DC Offset the Upper Freq values for DFD Upper/Center Freq IEC 60118 and Center Freq values for DFD IEC 60268 Amplitude DC Offset Figure 2-2 Generator: Waveform (Sine, Variable Phase, and Dual Sine) menu tree U8903A User’s Guide...

  • Page 47: Figure 2-3 Generator: Waveform (Noise, Dc, Multitone, Square, And Arbitrary) Menu Tree

    Waveform Amplitude Output Settings Frequency Tones Multiplier Amplitude DC Offset Phase Mode Preview Arbitrary Waveform Output Settings Amplitude DC Offset Recall File Save File Preview Figure 2-3 Generator: Waveform (Noise, DC, Multitone, Square, and Arbitrary) menu tree U8903A User’s Guide...

  • Page 48: Figure 2-4 Generator: Output Settings, Frequency, Amplitude, And Dc Offset Menu Tree

    For Balanced or Common mode output connection, impedance selection is 100  and 600 . For Unbalanced output connection, impedance selection is 50 and 600 . Figure 2-4 Generator: Output Settings, Frequency, Amplitude, and DC Offset menu tree U8903A User’s Guide...

  • Page 49: Table 2-2 Generator Menu Description

    Output Settings Refer to Output Settings SMPTE IMD 10:1 Upper Freq Enter the upper frequency value Lower Freq Enter the lower frequency value Amplitude Enter the composite signal amplitude value DC Offset Enter the signal DC offset value U8903A User’s Guide...
  • Page 50 Enter the signal fundamental frequency Start Freq value Enter the signal amplitude value Amplitude Enter the number of frequency Tones components, from 2 to 60 Enter the frequency multiplier Multiplier DC Offset Enter the signal DC offset value U8903A User’s Guide...
  • Page 51 100 and 600 . For Unbalanced mode output connection, the impedance selection is 50 and  600 . Frequency Enter the signal frequency value Amplitude Enter the signal amplitude value DC Offset Enter the signal DC offset value U8903A User’s Guide...

  • Page 52: Figure 2-5 Analyzer Function Menu Tree

    Gen Track, 1/128 s, 1/64 s, 1/32 s,  DFD 60118 2nd Meas Time 1/16 s, 1/8 s, 1/4 s, 1/2 s, 1 s DFD 60118 3rd Trigger Free Run, External Phase Refer to the Ref/Rel Ref/Rel menu tree Figure 2-5 Analyzer function menu tree U8903A User’s Guide...

  • Page 53: Figure 2-6 Analyzer: Units Menu Tree

    The analyzer function menu tree for Units is shown as follows. Analyzer Units Function 1 If function type is Frequency Function 2 Hz If function type is Amplitude dB If function type is Ratio  If function type is Phase Figure 2-6 Analyzer: Units menu tree U8903A User’s Guide...

  • Page 54: Figure 2-7 Analyzer: Ref/Rel Menu Tree

    Meas. Type selected. Meas > Lvl Rel If Meas. Type is Level Linear Meas > Frq Ref If Meas. Type is Frequency Delta Meas > Ratio Ref If Meas. Type is Ratio Delta Figure 2-7 Analyzer: Ref/Rel menu tree U8903A User’s Guide...

  • Page 55: Table 2-3 Analyzer Menu Description

    Select the second measurement parameter Noise Level SINAD THD + N Ratio THD + N Level Crosstalk (Ch Driv) Crosstalk (Ch Meas) SMPTE IMD DFD 60268 2nd DFD 60268 3rd DFD 60118 2nd DFD 60118 3rd Phase U8903A User’s Guide...
  • Page 56 Weighting Select either None, A-Weighting, CCIR 1k wtd, CCIR 2k wtd, C-Message, CCITT, or Custom Input Type Balanced Select either Balanced or Unbalanced input connection Unbalanced Range Auto Select the input range 400 mV to 140 V U8903A User’s Guide...
  • Page 57 Ratio Set the ratio reference value Meas > Lvl Rel Select either Off, Log, or Linear Linear Meas > Frq Ref Select either Off or Delta Delta Meas > Ratio Ref Select either Off or Delta Delta U8903A User’s Guide...

  • Page 58: Figure 2-8 Frequency And Time Domain Menu Trees

    Save Pts to File Running Mode Continuous, Single Graph (Time Domain) Monitor Settings Input Settings Axis Settings Harmonics/Graph View Not applicable Save Pts to File Running Mode Continuous, Single Figure 2-8 Frequency and time domain menu trees U8903A User’s Guide...

  • Page 59: Table 2-4 Graph (Frequency/Time Domain) Menu Description

    This function is not applicable in the time domain mode. Save Pts to File Saves the graph points to a file Running Mode Select either Continuous to allow the graph to run continuous measurements, or Single to stop the measurements U8903A User’s Guide...

  • Page 60: Figure 2-9 Sweep Function Menu Tree

    I/O Settings Configure the input and output settings Axis Settings Enter the graph axis values and spacing type. You can also choose to perform autoscaling. U8903A User’s Guide...

  • Page 61: Graph Functions

    Save Pts to File Saves the sweep points to a file Load Pts to List Loads the sweep points from a file Graph functions This group provides quick access to the commonly used graph functions. Figure 2-10 Graph panel U8903A User’s Guide...

  • Page 62: Run/Stop And On/Off

    Full Screen Maximizes the graph view to the full display size Run/Stop and On/Off For generator or analyzer, you can select a channel by on the U8903A front panel.  pressing the arrow keys  Toggling on the front panel will start or stop signal generation on a generator channel or measurements on an analyzer channel.

  • Page 63: Figure 2-12 Channel Selection And Status

    Selected channel Figure 2-12 Channel selection and status When the selected analyzer channel is in Run mode, the U8903A will take continuous readings as fast as possible based on the specified measurement time. Pressing while in the Run mode will stop the measurements for the selected analyzer channel.

  • Page 64: System

    Operation and Features  System The U8903A provides access to some useful system functions located on the System panel as shown in the following figure. Figure 2-13 System panel The description for each key on the System panel is shown in the following table.

  • Page 65: Figure 2-14 File Manager Menu For Saving The U8903A State

    Figure 2-14 File Manager menu for saving the U8903A state You may save the current U8903A state to a file in either the U8903A internal memory or a USB external flash storage. Set the storage location for your file by pressing Source and select either the U8903A internal memory or a USB external flash storage before saving.

  • Page 66: Figure 2-15 File Manager Menu For Recalling The U8903A State

    Figure 2-15 File Manager menu for recalling the U8903A state Press Source to select a saved U8903A state file in either the U8903A internal memory or a USB external flash storage. When you have selected a state file, pressing Recall will display a Recall page.

  • Page 67: Figure 2-16 Analyzer 8-Channel Display

    This function prints the display to a file on a USB external flash storage. Preset This function presets the U8903A to its factory default settings. When is pressed in the sweep, analyzer, graph, or generator mode, you may choose to preset any of the following: •...

  • Page 68: Figure 2-17 System Function Menu Tree

    Operation and Features  Local This function returns the U8903A to local operation from the remote mode. System The following figure shows the system function menu tree. System GPIB Address Enable FTP Control Date/Time Edit Disable Save Automatic LAN Settings...

  • Page 69: Table 2-8 System Menu Description

    Select the DSP firmware to update consisting of Master, FFT, and Card 1 Card 1 Power-Up State Default Sets the U8903A to its default power-on state Last Settings Sets the U8903A to its previous setting mode upon power up U8903A User’s Guide...
  • Page 70 French Sets the language to French German Sets the language to German For more information on the system functions, refer to the U8903A Audio N O T E Analyzer Instrument Help File. Help This function activates the help mode which provides a description of each front panel key or current softkey.

  • Page 71: Front Panel Lcd Display

    Operation and Features 2 Front Panel LCD Display The U8903A displays the analyzer view upon power- up, as shown in the following figure. Measurement status Softkey menu Measurement results Active channel Function 1 Function 2 Analyzer settings Channel 2 Status display...

  • Page 72: Editing Keys

    Table 2-9 Editing key/control description Item Control Description Knob Rotate the knob to increase or decrease a numeric value, change a highlighted digit or character, or step through lists or items in a row U8903A User’s Guide...
  • Page 73 Enter alphanumeric data by using the number keys and decimal point Enter Confirms an entry Arrow keys Use the arrow keys to select a channel, and highlight or navigate the editable items on the LCD display for editing U8903A User’s Guide...
  • Page 74 Operation and Features  U8903A User’s Guide...

  • Page 75: Instrument Configuration

    Digital filters Input configuration Input ranging Common Settings Measurement bandwidth Measurement time Trigger Output Settings Output type Output impedance This chapter describes how to configure the U8903A inputs and outputs to obtain the optimum measurement results for your application. Agilent Technologies...

  • Page 76: U8903A Block Diagram

    Multitone wave Arbitrary generator Figure 3-1 U8903A block diagram The description for the U8903A block diagram is provided as follows. Measurement An audio signal can enter the analyzer through either the Balanced (XLR) or Unbalanced (BNC) input signal connector. The audio signal then passes through the AC/DC coupling circuit.
  • Page 77 Finally, the waveform is routed through either the Balanced (XLR) or Unbalanced (BNC) output signal connectors to the unit- under- test (UUT). U8903A User’s Guide...

  • Page 78: Input Settings

    Instrument Configuration  Input Settings The U8903A analyzer inputs can be configured with selectable AC/DC coupling, AC level detector, digital filters, Unbalanced/Balanced input connections, and measurement ranges as shown in the following figure. Figure 3-2 Analyzer input settings U8903A User’s Guide...

  • Page 79: Ac/Dc Coupling

    The AC coupled setting is selected when you need to measure only the AC component of a signal, for example, when making RMS or peak- to- peak voltage measurements. The AC/DC coupling selection is shown as follows. Figure 3-3 AC/DC coupling selection U8903A User’s Guide...

  • Page 80: Ac Level Detection

    Quasi Peak detector provides a response conforming to the CCIR- 468 specification for noise measurements. This detector is usually used together with the CCIR- 1k weighted filter. Figure 3-4 AC level detector selection U8903A User’s Guide...

  • Page 81: Digital Filters

    Up to three filters, one from each type, can be applied to the signal simultaneously. The U8903A also allows user- defined filters to be uploaded to the device. Refer to “Appendix C: User- defined Filter File Format”...

  • Page 82: Input Configuration

    The Unbalanced configuration selects the front panel BNC connectors as the input source. The signal in the inner conductor of the coaxial connector is referenced to ground for measurement. Figure 3-6 Input signal connector configuration U8903A User’s Guide...

  • Page 83: Input Ranging

    The input range can also be set manually, with the values given below. • 400 mV • 800 mV • 1.6 V • 3.2 V • 6.4 V • 12.8 V • 25 V • 50 V • 100 V • 140 V U8903A User’s Guide...

  • Page 84: Common Settings

    Instrument Configuration  Common Settings The following figure shows the U8903A analyzer common settings. Figure 3-7 Common settings Measurement bandwidth The U8903A has two settings for measurement bandwidth. The low bandwidth mode has a maximum measurement bandwidth of 30 kHz, while the high bandwidth mode can measure signals with frequencies up to 100 kHz.

  • Page 85: Measurement Time

    This is useful when making sweep measurements as the measurement time will be optimized for fast sweeps. However, Gen Track works only if the signal is looped back from the U8903A output to its input. U8903A User’s Guide...

  • Page 86: Figure 3-9 Measurement Time Selection First Page

    Instrument Configuration  The measurement time selection is shown as follows. Figure 3-9 Measurement time selection first page Figure 3-10 Measurement time selection second page U8903A User’s Guide...

  • Page 87: Trigger

    External triggering is set, the analyzer waits for a trigger pulse on the Trigger In connector of the rear panel before acquiring the measurement data. The figure below shows the trigger setting selection of the analyzer. Figure 3-11 Trigger settings selection U8903A User’s Guide...

  • Page 88: Output Settings

    Instrument Configuration  Output Settings The U8903A generator output settings can be configured using selectable output connections and impedances as shown in the figure below. Figure 3-12 Output settings Output type The output connection can be set to Balanced, Unbalanced, or Common mode.

  • Page 89: Output Impedance

    Instrument Configuration 3 Output impedance The output impedance can be selected as follows. Balanced and Common mode: 100 , 600  Unbalanced: 50 , 600  U8903A User’s Guide...
  • Page 90 Instrument Configuration  U8903A User’s Guide...

  • Page 91: Audio Generator Functions

    U8903A Audio Analyzer User’s Guide Audio Generator Functions Audio Generator Sine waveform Variable phase waveform Dual sine waveform Noise signals DC signal Multitone waveform Square waveform Arbitrary waveform This chapter describes the procedure to generate the U8903A audio test signals. Agilent Technologies...

  • Page 92: Audio Generator

    • Dual sine • Dual • SMPTE IMD 1:1 • SMPTE IMD 4:1 • SMPTE IMD 10:1 • DFD IEC 60118 • DFD IEC 60268 • Noise • Gaussian • Rectangular • DC • Multitone • Square • Arbitrary U8903A User’s Guide...

  • Page 93: Figure 4-1 Generator Waveform Selection

    The generator waveform selection is shown as follows. Figure 4-1 Generator waveform selection Press More (1/2) to display more generator waveform selection as follows. Figure 4-2 More generator waveform selection To select the desired waveform or signal, press the corresponding softkey. U8903A User’s Guide...

  • Page 94: Sine Waveform

    Amplitude can be expressed as Vrms, Vpeak, Vpp, or dBV. For a perfect sine waveform without any DC offset, Vpp is twice Vpeak, while Vrms is equivalent to Vpeak/2. The DC offset refers to the DC component of the waveform. U8903A User’s Guide...

  • Page 95: Variable Phase Waveform

    Variable phase waveforms are useful for measuring the phase difference or timing skew between the channels of a multiple channel audio system. To select the variable phase waveform, press Waveform > Variable Phase. U8903A User’s Guide...

  • Page 96: Dual Sine Waveform

    Dual sine waveforms are useful in testing the intermodulation distortion characteristics of an audio system. To select a dual sine waveform, press Waveform > Dual Sine. U8903A User’s Guide...

  • Page 97: Figure 4-6 Dual Sine Waveform Selection

    Audio Generator Functions 4 The following figure shows the dual sine waveform selection. Figure 4-6 Dual sine waveform selection Dual waveform You can select a generic dual sine waveform as follows. Figure 4-7 Dual waveform menu U8903A User’s Guide...

  • Page 98: Figure 4-8 More Dual Sine Waveform Parameters

    Frequency 1 is the frequency of the first sine component. Frequency 2 is the frequency of the second sine component. Amplitude refers to the amplitude of the composite signal. Ratio refers to the amplitude ratio of the second component over the first component. U8903A User’s Guide...

  • Page 99: Figure 4-9 Smpte Imd Waveform Menu

    Figure 4-9 SMPTE IMD waveform menu The SMPTE IMD waveform may be configured with the following parameters. • Upper Frequency • Lower Frequency • Amplitude • DC Offset Amplitude refers to the amplitude of the composite signal. U8903A User’s Guide...

  • Page 100: Figure 4-10 Dfd Iec 60118 Waveform Menu

    Figure 4-10 DFD IEC 60118 waveform menu The DFD IEC 60118 waveform may be configured with the following parameters. • Difference Frequency • Upper Frequency • Amplitude • DC Offset Amplitude refers to the amplitude of the composite signal. U8903A User’s Guide...

  • Page 101: Figure 4-11 Dfd Iec 60268 Waveform Menu

    Amplitude refers to the amplitude of the composite signal. Refer to “Appendix A: SMPTE IMD and DFD Default Settings” on page 140 N O T E for the default settings of both SMPTE IMD and DFD waveforms. U8903A User’s Guide...

  • Page 102: Noise Signals

    To select the noise signal, press Waveform > Noise. You can select either a Gaussian or Rectangular noise signal as shown in the following figure. Figure 4-12 Noise signal selection The Gaussian noise signal menu is shown as follows. Figure 4-13 Gaussian noise signal menu U8903A User’s Guide...

  • Page 103: Dc Signal

    A DC voltage is used when performing amplifier linearity measurements. Press Waveform > DC to select the DC signal output. The following figure shows the DC signal menu. Figure 4-14 DC signal menu The only configurable parameter for the DC signal is amplitude. U8903A User’s Guide...

  • Page 104: Multitone Waveform

    To select a multitone waveform, press Waveform > Multitone. The multitone waveform menu is shown as follows. Figure 4-15 Multitone waveform menu Press More (1/2) to display more multitone waveform parameters as follows. Figure 4-16 More multitone waveform parameters U8903A User’s Guide...

  • Page 105: Figure 4-17 Multitone Waveform Preview

    In the Random Phase mode, the phase difference between the tones is randomized. This has the effect of reducing the crest factor for the multitone waveform. You may display the multitone waveform as follows. Figure 4-17 Multitone waveform preview U8903A User’s Guide...

  • Page 106: Square Waveform

    Arbitrary waveform The arbitrary waveform function enables you to load a digital waveform file into the U8903A as a sequence of waveform samples, with a maximum length of 32768 points. The samples are output at a fixed sampling rate of ...

  • Page 107: Figure 4-19 Arbitrary Waveform Menu

    Audio Generator Functions 4 The following figure shows the arbitrary waveform menu. Figure 4-19 Arbitrary waveform menu Press More (1/2) to display more arbitrary waveform parameters as follows. Figure 4-20 More arbitrary waveform parameters U8903A User’s Guide...

  • Page 108: Figure 4-21 Arbitrary Waveform Preview

    Figure 4-21 Arbitrary waveform preview The arbitrary waveform may be configured with the following parameters. • Amplitude • DC Offset You may load or save the arbitrary waveform data by pressing Recall File or Save File respectively. U8903A User’s Guide...

  • Page 109: Audio Analyzer Measurement Functions

    THD + N Ratio and THD + N Level SINAD SNR and Noise Level SMPTE intermodulation distortion (SMPTE IMD) Difference frequency distortion (DFD) Phase Crosstalk (channel driven and channel measured) This chapter explains the configuration of the U8903A for measuring the common audio analyzer measurement functions. Agilent Technologies...

  • Page 110: Audio Analyzer

     Audio Analyzer To access the analyzer mode, press on the Mode panel. Each channel of the U8903A can perform two measurement functions simultaneously. To configure the measurement functions, select the active channel using the arrow keys. The main menu functions of the analyzer mode are as follows.

  • Page 111: Figure 5-2 Function 1 Selection

    Audio Analyzer Measurement Functions 5 For Function 1, the following measurement functions can be selected. • Frequency • AC voltage • DC voltage The measurement functions of Function 1 are shown in the figure below. Figure 5-2 Function 1 selection U8903A User’s Guide...

  • Page 112: Figure 5-3 Function 2 Selection First Page

    • DFD IEC 60118 2nd/3rd order • Phase With the exception of phase and crosstalk, individual channels can be configured to measure different functions. The measurement functions of Function 2 are shown as follows. Figure 5-3 Function 2 selection first page U8903A User’s Guide...

  • Page 113: Figure 5-4 Function 2 Selection Second Page

    Audio Analyzer Measurement Functions 5 Figure 5-4 Function 2 selection second page Figure 5-5 Function 2 selection third page  U8903A User’s Guide...

  • Page 114: Figure 5-6 Function 2 Selection Fourth Page

    Chapter “Input Settings” on page 56. On the Common Settings menu, the selectable options include the measurement bandwidth, measurement time, and trigger mode. Refer to Chapter “Common Settings” page 62 for the details. U8903A User’s Guide...

  • Page 115: Measurement Functions

    This section describes the measurement functions. Frequency Frequency is a common and basic measurement function which is expressed in hertz (Hz). The U8903A uses software algorithm to detect the period of a repetitive waveform and the frequency is computed from the reciprocal of the period.

  • Page 116: Dc Voltage Level (Vdc)

    AC- to- DC converters. DC voltage is expressed in volts (V). DC level is one of the U8903A measurement functions. Coupling must be set to DC for DC level measurements. THD + N Ratio and THD + N Level Harmonic distortion on a spectrally pure signal is created by nonlinearities in the circuit through which it passes.

  • Page 117: Figure 5-7 Thd + N Level Measurement

    ------------------------------------------------------------------------------------------------------------- - THD + N Ratio = 20 log   rms value of signal, noise, and distortion The THD + N Ratio is expressed in dB (default) or as a percentage. U8903A User’s Guide...

  • Page 118: Sinad

    The ratio computed in the SINAD measurement is shown as follows.   rms value of signal, noise, and distortion ------------------------------------------------------------------------------------------------------------- - SINAD = 20 log   rms value of noise and distortion SINAD is expressed in dB (default) or as a percentage. U8903A User’s Guide...

  • Page 119: Snr And Noise Level

    The U8903A implementation of the SNR measurement is a closed loop configuration in which both the generator and the analyzer are used in the test setup. Channel 1 of the generator will be used for measurement on the analyzer channel 1.

  • Page 120: Figure 5-10 Snr Measurement

    UUT between the U8903A generator output and a built- in 600  termination. The UUT output is connected to the U8903A input. The analyzer will measure the UUT output signal amplitude when the generator is routed to the input. The noise level is measured when the input of the UUT is terminated with 600 .

  • Page 121: Smpte Intermodulation Distortion (Smpte Imd)

    SMPTE IMD is expressed in dB (default) or as a percentage. If tone 1 = f1 and tone 2 = f2, the following harmonics are considered. • f2 – f1 • f2 + f1 • f2 – 2f1 • f2 + 2f1 U8903A User’s Guide...

  • Page 122: Difference Frequency Distortion (Dfd)

    (typically 19 kHz and  20 kHz). This measurement also allows you to select either the second or third order intermodulation distortion. U8903A User’s Guide...

  • Page 123: Phase

    Phase shift varies with frequency, and therefore, it is common to make phase measurements at several frequencies or to plot the phase response of a frequency sweep. There are generally two types of phase measurements as follows. • interchannel phase delay • device phase response U8903A User’s Guide...

  • Page 124: Figure 5-14 Phase Measurement

    1 to measure the input, and the analyzer channel 2 to measure the output. The U8903A always uses channel 1 of the generator as the reference channel, while the selected analyzer channel becomes the reference channel for interchannel phase measurements.

  • Page 125: Crosstalk (Channel Driven And Channel Measured)

    Only one reference channel can be selected at any one time. The reference channel always displays a value of 0 dB or 100% for all N O T E crosstalk measurements. U8903A User’s Guide...

  • Page 126: Figure 5-15 Crosstalk: Channel Driven Mode

    The crosstalk result of the channel indicates the crosstalk from the other channel to the reference channel. Figure 5-16 Crosstalk: Channel measured mode U8903A User’s Guide...

  • Page 127: Frequency And Time Domain Analysis

    U8903A Audio Analyzer User’s Guide Frequency and Time Domain Analysis Frequency Domain and Time Domain Monitor settings Input settings Axis settings Harmonics display Graph Functions Peak search Marker Marker –> Full screen This chapter explains how to configure the graph settings for frequency and time domain analysis.

  • Page 128: Frequency Domain And Time Domain

    Frequency and Time Domain Analysis  Frequency Domain and Time Domain The U8903A graph mode displays a 2- dimensional graph of the signal in the frequency or time domain. To access the frequency or time domain mode, press on the Mode panel respectively.

  • Page 129: Figure 6-2 Time Domain Mode

    You also have the option to save the graph points to a file by pressing Save Pts to File. The File Manager menu will be launched. Refer to Chapter “Save” on page 43 for more information on using the File Manager menu. U8903A User’s Guide...

  • Page 130: Monitor Settings

    In the time domain mode, the steps involved are acquiring the data and displaying the results. On the other hand, the steps for the frequency domain mode consist of acquiring the data, performing the FFT operation, and processing the results for graphing. U8903A User’s Guide...
  • Page 131 Rectangular, Hann, and Hamming windows. This window is normally used for measuring higher order harmonics of single frequency signals. • Rife- Vincent 1 and 3 These windows have smooth, monotonically- falling responses with no sidelobes. U8903A User’s Guide...
  • Page 132 "cleaner" waveform in the time domain, or lowering the noise floor in the frequency domain display. Synchronous averaging is only applicable when the trigger source is set to N O T E the channel-based trigger. Refer to Input settings for the trigger settings. U8903A User’s Guide...

  • Page 133: Input Settings

    You can manually change the X- axis and Y- axis settings, such as the minimum and maximum values, as well as select between linear or log scale. You may perform an Autoscale to automatically scale the display according to the signal. U8903A User’s Guide...

  • Page 134: Harmonics Display

    You may select the channel and enter the number of harmonic component levels to be displayed. The signal harmonic components data will be listed in the table. This feature is not applicable in the time domain mode. Figure 6-6 Harmonics display U8903A User’s Guide...

  • Page 135: Graph Functions

    If the trace is above the threshold level, it will be identified as a peak, whereas the trace below the threshold level will be identified as a minimum. Use the knob on the U8903A front panel to move the threshold level along the plot. The...

  • Page 136: Marker

    You also have the option to display the measurement data of the selected marker(s) in a table as shown in Figure 6- For more information on the marker functions, refer to the U8903A Audio N O T E Analyzer Instrument Help File.

  • Page 137: Marker

    In addition, you can also view the area between the current marker and reference marker by pressing Marker Span. To access the  Marker  menu, press on the Graph panel. U8903A User’s Guide...

  • Page 138: Full Screen

    This function enables you to maximize the graph view to the full display size by pressing on the Graph panel. To exit the full screen mode, press any key on the U8903A front panel. Figure 6-11 Full screen U8903A User’s Guide...

  • Page 139: Sweep Function

    U8903A Audio Analyzer User’s Guide Sweep Function Sweep Sweep mode Sweep settings I/O settings Axis settings List view This chapter describes the U8903A sweep functions for performing sweep. Agilent Technologies...

  • Page 140: Sweep

    Sweep Function  Sweep The U8903A sweep mode enables you to perform sweeps and display the results in the graph or list form. To access the sweep mode, press on the Mode panel. In the sweep mode, a generator parameter such as frequency, amplitude, or phase is varied across a certain range.

  • Page 141: Figure 7-2 Sweep Menu Second Page

    File Manager menu. You may also perform sweep using a list of user- defined sweep points. Refer to “Appendix D: User- defined Sweep Points File Format” on page 147 for more information on the user- defined file format for the sweep points. U8903A User’s Guide...

  • Page 142: Sweep Mode

    You need to press each time to increment the points until the U8903A reaches the end of the sweep. Sweep points are based on the Start, Stop, and Step Size sweep parameter settings.

  • Page 143: Sweep Settings

    The sweep parameter selection will vary according to the selected waveform type. The sweep start and stop points, as well as the step size and number of points, can only be configured if the Auto Sweep or Manual Sweep mode is selected. U8903A User’s Guide...

  • Page 144: I/O Settings

    Noise Level is not applicable for the sweep measurement parameter selection. I/O settings The I/O settings page enables you to configure the sweep input and output settings as shown in the following figure. Figure 7-5 I/O settings page U8903A User’s Guide...

  • Page 145: Axis Settings

    You can manually change the X- axis and Y- axis settings, such as the minimum and maximum values, as well as select between linear or log scale. You may perform an Autoscale to automatically scale the display according to the signal. Figure 7-6 Axis settings page U8903A User’s Guide...

  • Page 146: List View

    Figure 7-7 List View Pressing Add Point enables you to add sweep points below the list. You may edit the sweep parameter value of a selected point by pressing Edit Point. To delete points, press Delete Point. U8903A User’s Guide...

  • Page 147: Specifications

    U8903A Audio Analyzer User’s Guide Specifications Characteristics Specifications Audio generator Audio analyzer Graph mode Audio filters Sweep capability Measurement Category Measurement category definitions This chapter displays the U8903A characteristics and specifications. Agilent Technologies...

  • Page 148: Characteristics

    • Canada: CAN/CSA-C22.2 No. 61010-1-04 • USA: ANSI/UL 61010-1:2004 EMC COMPLIANCE • IEC 61326-1:2005/EN 61326-1:2006 • Canada: ICES-001:2004 • Australia/New Zealand: AS/NZS CISPR11:2004 DIMENSIONS (W D H) 426.80 405.00 141.35 mm WEIGHT 8.5 kg (without cards) WARRANTY One year U8903A User’s Guide...

  • Page 149: Specifications

    0 dB to 100 dB   Phase –180 to 179.99 Sweep Frequency, amplitude, phase SQUARE Frequency Range 5 Hz to 30 kHz Output Range (Balanced) 0 V to 45.2 Vpp Range (Unbalanced/Common) 0 V to 22.6 Vpp U8903A User’s Guide...
  • Page 150 Maximum number of tones (Length/2) – 1 NOISE Type Gaussian, Rectangular Output Range (Balanced) 0 V to 7.2 Vrms (Gaussian), 0 V to 13.16 Vrms (Rectangular) Range (Unbalanced/Common) 0 V to 3.6 Vrms (Gaussian), 0 V to 6.58 Vrms (Rectangular) U8903A User’s Guide...
  • Page 151 Balanced (600 ) 20 dBm Unbalanced (600 ) 14 dBm Crosstalk –101 dB (at 23 °C ± 5 °C) 20 Hz to 20 kHz –99 dB (from 0 °C to 55 °C) –85 dB 20 kHz to 80 kHz U8903A User’s Guide...

  • Page 152: Audio Analyzer

    20 Hz to 20 kHz Input protection Overload protection for all ranges, onscreen warning message on the front panel TRIGGERING Type Free Run, External Level Minimum trigger high voltage 1.25 V Maximum trigger low voltage 0.5 V Input impedance >50 k U8903A User’s Guide...
  • Page 153 61. [2] Defined by the 24-bit measurement. [3] 0.01 dB – 0.001 dB/Hz below 50 Hz. [4] 0.012 dB – 0.001 dB/Hz below 50 Hz. [5] When AC coupled, CMRR will deteriorate at low frequencies. U8903A User’s Guide...

  • Page 154: Graph Mode

    • CCIR 1K weighted (CCIR Rec. 468) • CCIR 2K weighted (Dolby 2K) • C-Message (C-Message per IEEE 743) • CCITT (ITU-T Rec. O.41, ITU-T Rec. P.53) • User-defined [1] User-defined filters can be uploaded through standard I/O connections. U8903A User’s Guide...

  • Page 155: Sweep Capability

    3 kHz to 80 kHz Stop point (Center frequency) 3 kHz to 79 kHz Amplitude spot value 0 V to 16 Vrms (Balanced) Amplitude spot value 0 V to 8 Vrms (Unbalanced/Common) Difference frequency spot value 80 Hz to 2 kHz U8903A User’s Guide...
  • Page 156 –22.6 V to 22.6 V Stop point –11.3 V to 11.3 V (Unbalanced/Common) PHASE SWEEP   Start point –180 to 179.99   Stop point –180 to 179.99 [1] This range is applicable for sine wave only. U8903A User’s Guide...

  • Page 157: Measurement Category

    Specifications 8 Measurement Category The U8903A is intended to be used for measurement under Measurement Category I, 200 Vp for altitude up to 3000 m. Measurement category definitions Measurement CAT 1 Measurements performed on circuits that are not directly connected to MAINS.
  • Page 158 Specifications  U8903A User’s Guide...

  • Page 159: Index

    DC signal power on preset digital filters print dimensions input configuration display mode U8903A User’s Guide...
  • Page 160 Index rack mount rear panel recall remote interface run/stop save SINAD sine waveform SMPTE IMD square waveform sweep file menu mode settings specifications system menu THD + N trigger variable phase waveform ventilation window functions U8903A User’s Guide...

  • Page 161: Appendixes

    U8903A Audio Analyzer User’s Guide Appendixes Appendix A: SMPTE IMD and DFD Default Settings Appendix B: Arbitrary File Format Appendix C: User-defined Filter File Format Appendix D: User-defined Sweep Points File Format Appendix E: Spot Parameters Agilent Technologies...

  • Page 162: Appendix A: Smpte Imd And Dfd Default Settings

    The DFD default settings are shown in the following table. DFD IEC 60118 DFD IEC 60268 Difference frequency 80 Hz 80 Hz Upper frequency 10 kHz Center frequency 10 kHz Amplitude 0 Vrms 0 Vrms DC offset U8903A User’s Guide...

  • Page 163: Appendix B: Arbitrary File Format

    You have the option to change the Vpeak and DC offset values on the waveform preview page. Press Next to confirm the arbitrary waveform data. The arbitrary waveform menu will be displayed. U8903A User’s Guide...
  • Page 164 • For the Unbalanced and Common mode output connections,  Vpeak + |DC offset| must be within 0 V and 11.3 V. The sampling rate for the arbitrary waveform is fixed at 312.5 kHz. Thus, the interval between samples is 3.2 s 1/312.5). U8903A User’s Guide...
  • Page 165 • Summation of the Vpeak and DC offset exceeds the maximum voltage for the current output connection type. • Invalid Vpeak and DC offset values. • Total of sample points < 32. • The arbitrary file does not exist. U8903A User’s Guide...

  • Page 166: Appendix C: User-Defined Filter File Format

    // A[3] 0.005 // A[4] The FIR filter transfer function, H(z), is defined as: N O T E –1 –2 –3 H(z) = A[0] + A[1]z + A[2]z + A[3]z + ... where z = complex variable U8903A User’s Guide...
  • Page 167 A x 1  z 1 – A x 2  z 2 – A x 0     x = 1 where z = complex variable, N = number of sections, x = section number U8903A User’s Guide...
  • Page 168 IIR is one (seven coefficients). The delay is specified in the form of samples and within the range of 0 to 65535. It is recommended to use commas to separate the coefficients. However, newlines can also be used as separators. U8903A User’s Guide...

  • Page 169: Appendix D: User-Defined Sweep Points File Format

    You may specify the values of the sweep points in a row or column. For example: 100,200,300,400,500 The file is saved in the *.csv format. The system will sort the values in ascending order after parsing the file. N O T E U8903A User’s Guide...

  • Page 170: Appendix E: Spot Parameters

    Frequency 1 Lower Frequency SMPTE IMD (1:1, 4:1, and Amplitude Upper Frequency 10:1) Upper Frequency SMPTE IMD (1:1, 4:1, and Amplitude Lower Frequency 10:1) DFD IEC 60118 Amplitude Difference Frequency Center Frequency DFD IEC 60268 Amplitude Difference Frequency U8903A User’s Guide...
  • Page 171 Product specifications and descriptions in this document are subject to change with- out notice. Always refer to the Agilent web site for the latest revision. © Agilent Technologies, Inc. , 2009 - 2010 Second Edition, January 5, 2010 U8903-90002 Agilent Technologies...

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