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6

Frequency and Time Domain Analysis

130

Keysight U8903A User’s Guide

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 

or 

on 

the Mode panel respectively.
The settings available in both the frequency and time domain modes are as 

follows.
– Monitor settings
– Axis settings
– Input settings
To generate the graph once you have configured the settings, press 

on 

the U8903A front panel.
The frequency domain mode is shown in the following figure.

Figure 6-1

Frequency domain mode

Содержание U8903A

Страница 1: ...A Audio Analyzer Notice This document contains references to Agilent Please note that Agilent s Test and Measurement business has become Keysight Technologies For more information go to www keysight com User s Guide ...

Страница 2: ...customarily provided to the public to use modify reproduce release perform display or disclose commercial computer software or commercial computer software documentation No additional government requirements beyond those set forth in the EULA shall apply except to the extent that those terms rights or licenses are explicitly required from all providers of commercial computer software pursuant to t...

Страница 3: ...sulation or reinforced insulation Alternating current AC Off supply Both direct and alternating current On supply Three phase alternating current Caution risk of electric shock Earth ground terminal 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 cont...

Страница 4: ...circuits Operating personnel must not remove equipment covers or shields Procedures involving the removal of covers or shields are for use by service trained personnel only Under certain conditions dangerous voltages may exist even with the equipment switched off To avoid dangerous electric shock DO NOT perform procedures involving cover or shield removal unless you are qualified to do so DO NOT o...

Страница 5: ...the rated voltage as marked on the equipment CAUTION Use the device with the cables provided Repair or service that is not covered in this manual should only be performed by qualified personnels 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 bl...

Страница 6: ...erating temperature 0 C to 55 C Operating humidity 20 to 80 RH noncondensing at 40 C Storage temperature 40 C to 70 C Storage humidity 20 to 80 RH noncondensing at 65 C CAUTION The U8903A Audio Analyzer complies with the following safety and EMC requirements IEC 61010 1 2001 EN 61010 1 2001 2nd Edition Canada CAN CSA C22 2 No 61010 1 04 Canada ICES 001 2004 IEC 61326 1 2005 EN 61326 1 2006 Austral...

Страница 7: ...with the Australia EMC Framework regulations under the terms of the Radio Communication Act of 1992 ICES NMB 001 indicates that this ISM device complies with the Canadian ICES 001 Cet appareil ISM est conforme a la norme NMB 001 du Canada This instrument complies with the WEEE Directive 2002 96 EC marking requirement This affixed product label indicates that you must not discard this electrical el...

Страница 8: ...nitoring and Control Instrument product The affixed product label is as shown below Do not dispose in domestic household waste To return this unwanted instrument contact your nearest Keysight Service Center or visit http about keysight com en companyinfo environment takeback shtml for more information Sales and Technical Support To contact Keysight for sales and technical support refer to the supp...

Страница 9: ...des you through the configuration of the U8903A input and output settings for optimum measurement results 4 Audio Generator Functions This chapter provides you the information on the audio generator functions and settings of the U8903A 5 Audio Analyzer Measurement Functions This chapter describes the audio analyzer measurement functions and settings of the U8903A 6 Frequency and Time Domain Analys...

Страница 10: ...10 Keysight U8903A User s Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Страница 11: ...ard Accessories 31 Optional Accessories 31 Installation and Configuration 32 Initial inspection 32 Ventilation 32 Rack mounting 32 Maintenance 33 Fuse removal replacement 33 Power On the U8903A 34 Preset 35 Help System 36 2 Operation and Features Test Capabilities 38 Key Features 40 Remote interface 40 Sweep function 40 Frequency domain analysis 40 Digital filters 41 Front Panel Operation 42 Mode ...

Страница 12: ... 80 Input ranging 81 Frequency Lock 82 Common Settings 83 Measurement bandwidth 83 Measurement time 84 Trigger 86 Average Points 87 Ref Rel 88 Output Settings 90 Output type 90 Output impedance 91 Reference impedance 91 4 Audio Generator Functions Audio Generator 94 Sine waveform 96 Variable phase waveform 97 Dual sine waveform 98 Noise signals 104 DC signal 105 Multitone waveform 106 Square wavef...

Страница 13: ...rtion SMPTE IMD 123 Difference frequency distortion DFD 124 Phase 125 Crosstalk channel driven and channel measured 127 6 Frequency and Time Domain Analysis Frequency Domain and Time Domain 130 Monitor settings 132 Axis settings 135 Input settings 135 Harmonics display 136 Hold 137 Graph Functions 138 Peak search 138 Marker 139 Marker 140 Full screen 141 7 Sweep Function Sweep 144 Sweep settings 1...

Страница 14: ...fications A Appendixes Appendix A SMPTE IMD and DFD Default Settings 158 Appendix B Arbitrary File Format 159 Appendix C User defined Filter File Format 162 Appendix D User defined Sweep Points File Format 165 Appendix E Spot Parameters 166 ...

Страница 15: ...cy and time domain menu trees 56 Figure 2 9 Sweep function menu tree 58 Figure 2 10 Graph panel 59 Figure 2 11 Run Stop or On Off option 60 Figure 2 12 Channel selection and status 61 Figure 2 13 System panel 62 Figure 2 14 File Manager menu for saving the U8903A state 63 Figure 2 15 File Manager menu for recalling the U8903A state 64 Figure 2 16 Analyzer generator display 65 Figure 2 17 Analyzer ...

Страница 16: ...Figure 4 7 Dual waveform menu 99 Figure 4 8 More dual sine waveform parameters 100 Figure 4 9 SMPTE IMD waveform menu 101 Figure 4 10 DFD IEC 60118 waveform menu 102 Figure 4 11 DFD IEC 60268 waveform menu 103 Figure 4 12 Noise signal selection 104 Figure 4 13 Gaussian noise signal menu 104 Figure 4 14 DC signal menu 105 Figure 4 15 Multitone waveform menu 106 Figure 4 16 More multitone waveform p...

Страница 17: ...e 6 2 Time domain mode 131 Figure 6 3 Monitor settings page 132 Figure 6 4 Axis settings page 135 Figure 6 5 Input settings page 136 Figure 6 6 Harmonics display 136 Figure 6 7 Hold page 137 Figure 6 8 Hold configuration type 137 Figure 6 9 Peak Search menu 138 Figure 6 10 Marker menu 139 Figure 6 11 Marker measurement data display 140 Figure 6 12 Marker menu 141 Figure 6 13 Full screen 141 Figure...

Страница 18: ...18 Keysight U8903A User s Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Страница 19: ...key description 43 Table 2 2 Generator menu description 47 Table 2 3 Analyzer menu description 53 Table 2 4 Graph frequency time domain menu description 57 Table 2 5 Sweep menu description 58 Table 2 6 Graph panel key description 60 Table 2 7 System panel key description 62 Table 2 8 System menu description 68 Table 2 9 Editing key control description 72 Table 3 1 Filter selection 79 ...

Страница 20: ...20 Keysight U8903A User s Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Страница 21: ...er 24 Product at a Glance 25 Front Panel LCD Display 29 Product Dimensions 30 Standard Accessories 31 Optional Accessories 31 Installation and Configuration 32 Maintenance 33 Power On the U8903A 34 Preset 35 Help System 36 This chapter provides an overview of the outlook and installation of the U8903A audio analyzer ...

Страница 22: ... well as sweep capability for frequency amplitude and phase 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 22 6 Vp for the Balanced output configuration The audio generator features are listed as follows Balanced output signals XLR...

Страница 23: ...ement Signal to noise ratio SNR measurement Noise Level measurement SMPTE IMD measurement DFD measurement Crosstalk measurement RMS Peak to Peak Quasi Peak type detectors AC DC coupling Digital filters such as low pass high pass and weighting filters Input autoranging Selectable measurement bandwidth Selectable measurement time Free Run or External trigger mode To search for software firmware upda...

Страница 24: ...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 Hence it is easy to use instrument expecially with the usage of an integrated Web browser that provides a convenient way to configure the instrument s functionality ...

Страница 25: ...ure 1 1 U8903A front panel 2 1 3 11 13 14 4 5 6 7 8 9 10 12 Table 1 1 U8903A front panel description Item Display Description 1 LCD display Provides information on the current function including status indicators settings and error messages Item Key Description 2 Power on off Turns the U8903A on or off ...

Страница 26: ...ctive channels 6 Graph Enables access to the graph functions including peak navigation and marker function You can also use the Full Screen function to maximize the display area 7 Mode Enables access to the U8903A core functions 8 Data Entry Contains alphanumeric and editing keys to enter values or text or modify the values or data and confirm an entry 9 Enter and arrow keys The Enter key confirms...

Страница 27: ...Analyzer input Accepts an audio signal from the UUT A XLR female input connector and a BNC female input connector are provided for each channel 13 USB host 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 14 Headphone jack The headphone jack will only be applicable in future re...

Страница 28: ... Bus IEEE 488 standard interface 5 USB host Used to connect a USB external flash storage 6 USB device Allows communication with the PC via a USB cable 7 LAN interface Allows Ethernet LAN communication through a 10 100 Base T LAN cable Recommended to use a shielded LAN cable 8 VGA interface Allows the U8903A to be connected to an external monitor 9 Fuse Fuse compartment for AC supply 10 AC power Re...

Страница 29: ...play The U8903A displays the analyzer view upon power up as shown in the following figure Figure 1 3 Power up display Measurement results Measurement status Softkey menu Active channel Function 1 Function 2 Analyzer settings Channel 2 Status display LAN status USB status ...

Страница 30: ...1 Getting Started 30 Keysight U8903A User s Guide Product Dimensions Top view Front view 405 00 mm 15 94 in 425 60 mm 16 76 in 133 60 mm 5 25 in ...

Страница 31: ...ielded LAN cable USB cable USB flash storage device Keysight U8903A Audio Analyzer Quick Start Guide Keysight U8903A Audio Analyzer Product Reference CD ROM Certificate of Calibration Optional Accessories The following accessories are available for purchase separately BNC male to BNC male cable 1 2 m jade gray BNC male to RCA male cable 2 m black XLR male to XLR female cable 2 m black Rack mount k...

Страница 32: ... 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 Rack mounting The U8903A can be mounted in a standard 19 inch rack Rack mount kits are avai...

Страница 33: ... be able to see two fuses The active fuse is the one on the right while the other is the backup 3 Remove the active fuse and replace it with the one of the correct rating and type for your selected input AC line voltage NOTE Ensure that you are using the quick acting low breaking capacity 5 A 250 V fuse WARNING Ensure that you use the correct fuse rating for the selected AC line voltage Do not use...

Страница 34: ...y adjust to the correct line voltage in the range of 100 Vac to 240 Vac To turn on the U8903A press located on the lower left corner of the front panel Press again to turn off the U8903A WARNING Always use a grounded power cord Table 1 3 Power cord types Plug type Cable part number Plug type Cable part number Opt 900 U K 8120 1703 Opt 918 Japan 8120 4754 Opt 901 Australia 8120 0696 Opt 919 Israel ...

Страница 35: ...form either one of the following steps Send the RST SYSTem PRESet SYSTem RESet MODE or SYSTem RESet CHANnel SCPI commands from the PC via the USB GPIB or LAN interface Press on the System panel Opt 906 Switzerland 8120 2296 Opt 922 China 8120 8377 Opt 912 Denmark 8120 2957 Opt 927 Thailand 8120 8871 Opt 917 South Africa 8120 4600 Table 1 3 Power cord types continued Plug type Cable part number Plu...

Страница 36: ...u require The key displays the description of all the front panel keys and current softkeys 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 4 Help dialog information example ...

Страница 37: ...Operation and Features Test Capabilities 38 Key Features 40 Front Panel Operation 42 Editing Keys 71 This chapter describes the operation and features that are offered by the U8903A such as test capabilities key features and front panel menu operation ...

Страница 38: ...U8903A performs the following two basic functions Audio signal generation Audio signal analysis The U8903A basic configuration has two channels of generator functions and two channels of analyzer functions which enables the 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...

Страница 39: ...ow is the list of the audio analyzer features Balanced input signals XLR Unbalanced input signals BNC Frequency measurement AC voltage measurement DC voltage measurement Phase measurement THD N Ratio measurement THD N Level measurement SINAD measurement Signal to noise ratio SNR measurement Noise Level measurement SMPTE IMD measurement DFD measurement Crosstalk measurement RMS Peak to Peak Quasi P...

Страница 40: ...A can perform sweeps and the results are displayed on the LCD display The sweep function offers you flexible sweep configurations to cater to the various waveform types and parameters The available main settings include the sweep mode sweep parameter measurement parameter sweep interval and also the dwell time Data obtained from the sweep may be read from a list Frequency domain analysis The Fast ...

Страница 41: ...T CCIR C Message and A Weighting The U8903A also allows user defined filters to be uploaded to the device You need to specify the filter parameters comprising filter type group delay and coefficients sections The filter parameters will be saved in a file and then uploaded to the U8903A Refer to Appendix C User defined Filter File Format on page 162 for more information on the user defined filter f...

Страница 42: ...de 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 ...

Страница 43: ...the menu tree shows the waveform functions consisting of Sine Variable Phase and Dual Sine while the second section shows the other waveform functions comprising 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 Ta...

Страница 44: ...s Variable Phase Waveform Frequency Output Settings Phase 1 Dual Sine Dual Waveform Frequency 1 Amplitude Frequency 2 DC Offset Amplitude DC Offset Ratio Output Settings SMPTE IMD 1 1 SMPTE IMD 4 1 SMPTE IMD 10 1 Amplitude Waveform Upper Freq Amplitude Lower Freq DC Offset Output Settings DFD IEC 60118 DFD IEC 60268 Waveform Difference Freq Amplitude Upper Center DC Offset Output Settings You are ...

Страница 45: ...Noise DC Multitone Square and Arbitrary menu tree Generator Noise Gaussian DC Multitone Wavefor Start Freq Tones Amplitude DC Offset Multiplier Output Settings Waveform Rectangular Waveform Amplitude Output Settings DC Offset Waveform Amplitude Output Settings Phase Mode Preview Square Waveform Frequency Output Settings Amplitude Arbitrary Waveform Amplitude Preview Recall File DC Offset Save File...

Страница 46: ...ure 2 4 Generator Output Settings Frequency Amplitude and DC Offset menu tree Generator Output Type Amplitude Balanced Unbalanced Common Frequency DC Offset Output Settings Impedance 50 Ω 600 Ω 100 Ω 600 Ω For Balanced or Common mode output connection impedance selection is 100 Ω and 600 Ω For Unbalanced output connection impedance selection is 50 Ω and 600 Ω Ref Imp ...

Страница 47: ... selected channel with reference to channel 1 Dual Sine Dual Waveform Select the signal waveform type Output Settings Refer to Output Settings Frequency 1 Enter the first sinewave component frequency value Frequency 2 Enter the second sinewave component frequency value Amplitude Enter the composite signal amplitude value Ratio Enter the ratio of the amplitude of the second sinewave component over ...

Страница 48: ...mplitude value DC Offset Enter the signal DC offset value Noise Gaussian Rectangular Waveform Select the signal waveform type Output Settings Refer to Output Settings Amplitude Enter the signal amplitude value DC Offset Enter the signal DC offset value DC Waveform Select the signal waveform type Output Settings Refer to Output Settings Amplitude Enter the signal amplitude value Multitone Waveform ...

Страница 49: ...om a file Save File Saves the existing arbitrary waveform to a file Preview Displays a preview of the arbitrary waveform in the time domain Output Settings Output Type Balanced Unbalanced Common Select either Balanced Unbalanced or Common mode output connection Impedance 50 Ω 600 Ω 100 Ω 600 Ω Select the output impedance value For Balanced or Common mode output connection the impedance selection i...

Страница 50: ...lk Ch Meas SMPTE IMD DFD 60268 2nd DFD 60268 3rd DFD 60118 2nd Units Function 1 Function 2 Refer to the Units menu tree Analyzer Settings Coupling Detector Filter Input Type Range AC DC RMS QPK Peak to Peak None LPF Weighting HPF None 15 kHz 20 kHz 30 kHz Custom None 22 Hz 100 Hz 400 Hz Custom None A Weighting CCIR 1k wtd CCIR 2k wtd C Message CCITT Custom Balanced Unbalanced Auto 400 mV 800 mV 1 ...

Страница 51: ...nction menu tree for Units is shown as follows Figure 2 6 Analyzer Units menu tree Analyzer Hz V Units Function 1 Function 2 If function type is Frequency dBu dBV dBm W dBr dBg If function type is Amplitude dB If function type is Ratio If function type is Phase ΔHz x ΔdB x ...

Страница 52: ...s Figure 2 7 Analyzer Ref Rel menu tree Analyzer Ref Rel Impedance Meas Type Meas Lvl Rel Level Frequency Ratio Meas Frq Ref Meas Ratio Ref Off Log Linear Off Delta Off Delta Level Frequency Ratio The value displayed depends on the Meas Type selected If Meas Type is Level If Meas Type is Frequency If Meas Type is Ratio ...

Страница 53: ...Level 3 Description Function 1 Frequency Vac Vdc Select the first measurement parameter Function 2 Frequency Vac Vdc SNR 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 Select the second measurement parameter ...

Страница 54: ...e filter function LPF Select either None 15 kHz 20 kHz 30 kHz or Custom HPF Select either None 22 Hz 100 Hz 400 Hz or Custom Weighting Select either None A Weighting CCIR 1k wtd CCIR 2k wtd C Message CCITT or Custom Input Type Balanced Unbalanced Select either Balanced or Unbalanced input connection Range Auto 400 mV to 140 V Select the input range Frequency Lock Auto Gen Lock Select the fundament...

Страница 55: ...om 1 to 50 Ref Rel Meas Type Level Frequency Ratio Select either Level Frequency or Ratio measurement type Impedance Set the reference impedance value Level Set the voltage reference value Frequency Set the frequency reference value Ratio Set the ratio reference value Meas Lvl Rel Off Log Linear Select either Off Log or Linear Meas Frq Ref Off Delta Select either Off or Delta Meas Ratio Ref Off De...

Страница 56: ...the time domain graph display The figure below shows the frequency and time domain menu trees Figure 2 8 Frequency and time domain menu trees Graph Frequency Domain Input Settings Monitor Settings Axis Settings Running Mode Harmonics Graph View Save Pts to File Continuous Single Graph Time Domain Input Settings Monitor Settings Axis Settings Running Mode Harmonics Graph View Save Pts to File Conti...

Страница 57: ...ose to perform autoscaling Harmonics Graph View Displays the level of each signal harmonic component This function is not applicable in the time domain mode Hold Channel 1 Channel 2 None Max Min Select the holding mode to be used to update the graph data for channel 1 and 2 Running Mode Continuous Single Select either Continuous to allow the graph to run continuous measurements or Single to stop t...

Страница 58: ...l I O Settings Axis Settings List View Save Pts to File Add Point Edit Point Delete Point Hold None Max Min Auto Scale Auto Scale X Auto Scale Y Table 2 5 Sweep menu description Level 1 Level 2 Description Channel 1 or 2 Select the channel to perform sweep Sweep Settings Select the waveform type generator sweep parameter sweep interval and analyzer measurement function as well as configure the swe...

Страница 59: ...o List Manual Sweep Manual List Select the sweep and list modes I O Settings Configure the input and output settings List View Add Point Edit Point Delete Point Displays the sweep results in list form You may add sweep points edit the sweep parameter value of a selected point or delete points Save Pts to File Saves the sweep points to a file Load Pts to List Loads the sweep points from a file Tabl...

Страница 60: ...ront panel will turn on or off the generator output for all active channels Figure 2 11 Run Stop or On Off option Table 2 6 Graph panel key description Item Key Description 1 Peak Search Places a marker on either the peak or minimum of the graph 2 Marker Accesses the marker softkeys that select the current and reference markers and turns them on and off You may also move the markers and display th...

Страница 61: ...t status on the analyzer 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 Run mode Selected channel ...

Страница 62: ... 2 7 System panel key description Item Key Description 1 Save Saves the U8903A state to a file 2 Recall Recalls the U8903A state from a file 3 Display Mode Toggles between the number of channels to show on the LCD display 4 Print Prints the display to a file on a USB external flash storage 5 Preset Presets the U8903A to its factory default settings 6 Local Activates local control to switch from re...

Страница 63: ...File Manager will be launched once you have made your selection 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 To save the ...

Страница 64: ...d a state file pressing Recall will display a Recall page For single channel state file the Recall page allows you to select the channel s to apply the settings For module state file except graph the Recall page allows you to select which channel settings to be applied As there are no multiple channel settings in the graph state file channel selection is not applicable in its Recall page For more ...

Страница 65: ...either two or eight channels for the generator mode and display either two channels analyzer generator channels or eight channels for the analyzer mode The analyzer generator display is shown as follows This display is only available in the analyzer mode Figure 2 16 Analyzer generator display ...

Страница 66: ... 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 Selected channel only applicable for the sweep analyzer or generator mode Selected module All modules without deleting the user defined files Whole system including deletion of the user defi...

Страница 67: ...gs Reset Settings Save Settings Automatic Manual Date Time Edit Cancel Save Brightness Service Self Test Complete Test Front Panel Diagnostic Display Customized Test Update Application DSP Firmware Master Power Up State Default Last Settings Help Language FFT Card 1 Secure Erase All Key Sound HP8903B Config English US Japanese French German Mode Channel Left Filter Right Filter Load File Run Updat...

Страница 68: ...er the date and time Save Saves the date and time settings Cancel Cancels the changes made Brightness Adjust the brightness of the LCD display from 0 to 6 Service Self Test Complete Test Performs a full instrument self test Customized Test Performs a self test on a particular section of the U8903A Diagnostic Front Panel Performs a diagnostic test on the U8903A front panel You can verify whether a ...

Страница 69: ...ult power on state Last Settings Sets the U8903A to its previous setting mode upon power up Help Language English US Sets the language to English Japanese Sets the language to Japanese French Sets the language to French German Sets the language to German Key Sound Turns on off the keypad sound HP8903B Config Mode Select to enable disable the HP8903B mode Channel Select the active channel for HP890...

Страница 70: ...E In default setting the HP8903B mode is enabled There are some limitations when the HP8903B mode is enabled HP8903B commands are only applicable in GPIB interface Large data 32K graph data or image capture using SYST DISP IMAG command are not able to be acquired using the GPIB interface GPIB response is slower in HP8903B mode NOTE For more information on the system functions refer to the U8903A A...

Страница 71: ...d Features 2 Keysight U8903A User s Guide 71 Editing Keys The editing keys consist of the left navigation keys and right input keys as shown in the following figure Figure 2 19 Editing function keys 8 6 2 3 4 5 1 7 ...

Страница 72: ...n a row 2 Back Space Deletes the character to the left of the cursor 3 Esc Cancels a selected action 4 Enter Confirms an entry 5 Specifies a positive or negative value For a negative value toggle this key to enter the negative sign before a numeric value 6 Numeric keys Enter alphanumeric data by using the number keys and decimal point or select the channel number in analyzer mode 7 Enter Confirms ...

Страница 73: ... Instrument Configuration U8903A Block Diagram 74 Input Settings 76 Common Settings 83 Ref Rel 88 Output Settings 90 This chapter describes how to configure the U8903A inputs and outputs to obtain the optimum measurement results for your application ...

Страница 74: ...gh the AC DC coupling circuit If AC coupling is selected its DC component is blocked thus only the AC component of the signal passes through to the Ranging circuit However if DC coupling is selected the entire signal passes through to the Ranging circuit Inputs Balanced Unbalanced o o o AC DC coupling Ranging ADC Low Pass filter Weighting filter o High Pass filter o Measurement algorithm DSP softw...

Страница 75: ...ombination of up to three digital filters one each from the low pass high pass and weighting filter groups before sending it to the measurement section Signal generation The DSP generates all the required waveforms except for square wave digitally The digital waveform data is streamed realtime into the 24 bit digital to analog converter DAC where it is converted to voltage and sent to the output c...

Страница 76: ...ide 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 ...

Страница 77: ...ut signal by switching a capacitor in series to the input path The DC coupled setting allows signals to be measured down to 0 Hz This setting should be used when making DC voltage measurements 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...

Страница 78: ...entional true root mean square RMS measurement on the input signal This RMS value includes the DC component unless the AC coupling mode is selected The Peak to Peak detector returns the peak to peak voltage while the 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 ...

Страница 79: ...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 on page 162 for more information on the user defined filter file format Figure 3 5 Digital filter selection The low pass high pass and weighting filter selection is as follows Table 3 1 Filter selection Low pass filter High pass filter Weighting ...

Страница 80: ...m the front panel XLR input connectors to the analyzer The signals on the positive and negative XLR pins enter a differential amplifier where they are subtracted before passing on to the detector 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 ...

Страница 81: ...Input ranging The default range setting is Auto where the analyzer sets the optimum input range based on the input signal amplitude 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 ...

Страница 82: ...is Gen Lock whereas for THD N Ratio and THD N Level the default frequency lock type is Auto When the frequency lock type is set to Auto the fundamental frequency is determined by the measured signal frequency of the frequency measurement function Function 1 measurement is set to Frequency if the frequency lock type is Auto When the frequency lock type is set to Gen Lock the fundamental frequency i...

Страница 83: ... 3 8 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 The low bandwidth mode is the default setting with better residual noise and distortion performance ...

Страница 84: ...ration ranging from 0 0078125 s equivalent to a measurement rate of 128 readings s to 1 s When the measurement time is set to Gen Track the analyzer will vary the measurement time according to the generator frequency for the same channel 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 ...

Страница 85: ...rument Configuration 3 Keysight U8903A User s Guide 85 The measurement time selection is shown as follows Figure 3 10 Measurement time selection first page Figure 3 11 Measurement time selection second page ...

Страница 86: ...yzer triggers immediately after the previous data is acquired If 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 12 Trigger settings selection ...

Страница 87: ...default average points setting is 1 This sets the number of readings used for averaging Higher number of average points should be used when the analyzed data is noisy The figure below shows the average points setting selection of the analyzer Figure 3 13 Average points selection ...

Страница 88: ...nce voltage frequency and ratio values depending on the type of reference to be set for unit conversion There are three available types consisting of Level Frequency and Ratio For the relative level values the level measurement can be displayed in Off mode Log mode dBr or Linear mode x Figure 3 14 Reference Level ...

Страница 89: ...he reference frequency values the frequency measurement can be displayed in Off mode Hz or Delta mode ΔHz Figure 3 15 Reference Frequency For the reference ratio values the ratio measurement can be displayed in Off mode or Delta mode ΔdB Figure 3 16 Reference Ratio ...

Страница 90: ...w Figure 3 17 Output settings Output type The output connection can be set to Balanced Unbalanced or Common mode Balanced outputs a pair of differential signals which are equal in amplitude but 180 out of phase on the XLR positive and negative pins Unbalanced outputs a signal referenced to ground on the BNC output connector Common mode outputs a pair of equal amplitude and in phase signals on the ...

Страница 91: ...mpedance can be selected as follows Balanced and Common mode 100 Ω 600 Ω Unbalanced 50 Ω 600 Ω Reference impedance The reference impedance can be set as shown in the figure below The impedance is used for conversion of the measurement result in unit W or dBm Figure 3 18 Reference impedance ...

Страница 92: ...3 Instrument Configuration 92 Keysight U8903A User s Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Страница 93: ...Keysight U8903A Audio Analyzer User s Guide 93 4 Audio Generator Functions Audio Generator 94 This chapter describes the procedure to generate the U8903A audio test signals ...

Страница 94: ...configuring the channel You can perform a channel selection by using the arrow keys The generator waveform functions are listed as follows These waveform functions are accessible by pressing the corresponding softkeys Sine Variable phase 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 ...

Страница 95: ...tor 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 ...

Страница 96: ...shows the sine waveform menu Figure 4 3 Sine waveform menu The sine waveform may be configured with the following parameters Frequency Amplitude DC Offset Frequency is the reciprocal of the period of the signal 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 c...

Страница 97: ... has a value of 1 5 V This value is equivalent to the average amplitude of the waveform Variable phase waveform The variable phase mode outputs a sine waveform on all channels The waveforms on all channels share the same frequency however their phase and amplitude can differ Variable phase waveforms are useful for measuring the phase difference or timing skew between the channels of a multiple cha...

Страница 98: ...eters Frequency Amplitude Phase 1 Phase 1 refers to the phase of the selected channel with reference to channel 1 Dual sine waveform The dual sine waveform group allows you to generate a composite waveform that is the summation of two independent sine waveforms Dual sine waveforms are useful in testing the intermodulation distortion characteristics of an audio system To select a dual sine waveform...

Страница 99: ...Keysight U8903A User s Guide 99 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 ...

Страница 100: ... The dual sine waveform may be configured with the following parameters Frequency 1 Frequency 2 Amplitude Ratio DC Offset 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 ...

Страница 101: ... waveforms consist of a lower and an upper frequency sine waveform at default values of 60 Hz and 7 kHz respectively They are differentiated by the amplitude ratio between the lower and upper frequencies The following figure shows the 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 Amp...

Страница 102: ...r together There are two predefined DFD dual tones consisting of DFD IEC 60268 and DFD IEC 60118 The following figure shows the 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 ...

Страница 103: ...8 waveform menu The DFD IEC 60268 waveform may be configured with the following parameters Difference Frequency Center Frequency Amplitude DC Offset Amplitude refers to the amplitude of the composite signal NOTE Refer to Appendix A SMPTE IMD and DFD Default Settings on page 158 for the default settings of both SMPTE IMD and DFD waveforms ...

Страница 104: ...nals 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 ...

Страница 105: ... following parameters Amplitude DC Offset 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 ...

Страница 106: ...ne 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 ...

Страница 107: ...r is used to multiply the start frequency to determine the frequency spacing between the tones The phase mode consists of the Zero Phase and Random Phase mode In the Zero Phase mode all frequency components have the same phase where there is zero phase difference between any two tones In the Random Phase mode the phase difference between the tones is randomized This has the effect of reducing the ...

Страница 108: ...4 18 Square waveform menu The square waveform may be configured with the following parameters Frequency Amplitude 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 312 5 kHz from the generator in a continuous sequenc...

Страница 109: ...ht U8903A User s Guide 109 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 ...

Страница 110: ...File Format on page 159 You may display the arbitrary waveform in the time domain as shown in the following figure 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 ...

Страница 111: ...nalyzer User s Guide 111 5 Audio Analyzer Measurement Functions Audio Analyzer 112 Measurement Functions 117 This chapter explains the configuration of the U8903A for measuring the common audio analyzer measurement functions ...

Страница 112: ...03A 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 Function 1 Function 2 Analyzer Settings Common Settings Ref Rel The analyzer menu functions are shown in the following figure Figure 5 1 Analyzer menu functions ...

Страница 113: ...e the softkeys to configure the measurement functions of the analyzer mode 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 ...

Страница 114: ...NR Noise Level SINAD THD N Ratio THD N Level Crosstalk channel driven channel measured SMPTE IMD DFD IEC 60268 2nd 3rd order 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 ...

Страница 115: ...Audio Analyzer Measurement Functions 5 Keysight U8903A User s Guide 115 Figure 5 4 Function 2 selection second page Figure 5 5 Function 2 selection third page ...

Страница 116: ...r more information on the measurement settings refer to Chapter 3 Input Settings on page 76 On the Common Settings menu the selectable options include the measurement bandwidth measurement time and trigger mode Refer to Chapter 3 Common Settings on page 83 for the details On the Ref Rel menu you may set the the reference impedence voltage frequency and ratio values depending on the type of referen...

Страница 117: ...ed high frequency noise from the measured signal allowing more stable readings AC voltage level Vac This is the most common measurement function of an AC signal The U8903A provides three types of AC level detection consisting of RMS Peak to Peak and Quasi Peak Refer to Chapter 3 AC level detection on page 78 for more information When the RMS detection method is selected the AC voltage measurement ...

Страница 118: ...gnal level applying filtering or adding negative feedback In communication devices THD N indicates how well a signal is being reproduced at the receiver after going through the communication medium To limit the bandwidth to the band of interest input filters like the C Message weighting filter can be applied Use the appropriate input range to avoid clipping and also to make full use of the ADC dyn...

Страница 119: ...N Ratio is defined as the ratio of the square root of the sum of the squares of all the signal harmonic components and noise amplitude relative to the total signal amplitude The THD N Ratio can be computed as follows The THD N Ratio is expressed in dB default or as a percentage THD N Ratio 20 log rms value of noise and distortion rms value of signal noise and distortion ...

Страница 120: ...al Noise And Distortion SINAD is equal to the reciprocal of the distortion measurement It is mostly used to determine the sensitivity of a communications receiver The ratio computed in the SINAD measurement is shown as follows SINAD is expressed in dB default or as a percentage SINAD 20 log rms value of signal noise and distortion rms value of noise and distortion ...

Страница 121: ...ntation 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 The SNR for an audio system such as an amplifier at a specified input or output level is the ratio between the output signal power and noise level An SNR value is further defined by th...

Страница 122: ...er 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 Ω It is expressed in Vrms The ratio between the output signal amplitude and noise level is the SNR result which can be expressed in dB default or as a percentage The SNR can be computed as follows The figure below shows the SNR measu...

Страница 123: ...TE IMD function provides a measure of the second and third order intermodulation distortion introduced by the UUT by injecting two pure tones tone 1 and tone 2 where tone 1 is at a much lower frequency than tone 2 for example 60 Hz and 7 kHz respectively into the UUT 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 f...

Страница 124: ...98 for information on generating dual tones for this test The SMPTE IMD measurement is shown as follows Figure 5 12 SMPTE IMD measurement Difference frequency distortion DFD The DFD measurement is similar to SMPTE IMD except that the two tones in the stimulus signal are of equal amplitude and are spaced closer to each other typically 19 kHz and 20 kHz This measurement also allows you to select eit...

Страница 125: ...eform measured from a reference waveform The reference is usually the same signal at a different point in the system or a related signal in a different channel of the system Phase is expressed in degrees 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 p...

Страница 126: ...onnected to channel 2 Set the analyzer to measure phase If channel 1 is set as the reference channel the channel 2 result is the interchannel phase delay A phase response measurement compares the phase of the output signal of a UUT to the phase of the signal at its input A simple way to make this measurement is to use the analyzer channel 1 to measure the input and the analyzer channel 2 to measur...

Страница 127: ...riate bias point Crosstalk is largely due to capacitive coupling between the channel conductors in the device and generally varies with frequency There are two modes of crosstalk measurement comprising channel driven and channel measured Crosstalk can be computed as follows Crosstalk 20 log In the channel driven mode the designated reference channel will be injected with the stimulus The presence ...

Страница 128: ...en mode In the channel measured mode as shown below the designated reference channel is used to measure the crosstalk from the other channel to this channel The crosstalk result of the channel indicates the crosstalk from the other channel to the reference channel Figure 5 16 Crosstalk Channel measured mode ...

Страница 129: ...dio Analyzer User s Guide 129 6 Frequency and Time Domain Analysis Frequency Domain and Time Domain 130 Graph Functions 138 This chapter explains how to configure the graph settings for frequency and time domain analysis ...

Страница 130: ...ain To access the frequency or time domain mode press or on the Mode panel respectively The settings available in both the frequency and time domain modes are as follows Monitor settings Axis settings Input settings To generate the graph once you have configured the settings press on the U8903A front panel The frequency domain mode is shown in the following figure Figure 6 1 Frequency domain mode ...

Страница 131: ... continuously by pressing Running Mode Continuous The Running Mode Single function enables you to perform a single acquisition of the graph data each time is pressed 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 2 Save on page 63 for more information on using the File Manager menu ...

Страница 132: ...e channels 3 to 8 will only be available in future releases The other functions of the monitor settings are listed as follows Analysis mode The analysis mode allows you to set the graph display to either time domain frequency domain magnitude or frequency domain phase In the time domain mode the steps involved are acquiring the data and displaying the results On the other hand the steps for the fr...

Страница 133: ...t are close together The Hann window has the best overall filter characteristic and is a good general purpose window for most signal analyses Hamming This window provides better frequency resolution but less amplitude accuracy compared to the Rectangular window The Hamming window has a slightly better frequency resolution than the Hann window and is suitable for measuring sine periodic and asymmet...

Страница 134: ...048 4096 8192 16384 32768 Synchronous averaging Synchronous averaging reduces noise levels by averaging the acquired data in the time domain This has the effect of producing a cleaner waveform in the time domain or lowering the noise floor in the frequency domain display NOTE Synchronous averaging is only applicable when the trigger source is set to the channel based trigger Refer to Input setting...

Страница 135: ...gnal or to autoscale the X axis or Y axis Figure 6 4 Axis settings page Input settings The input settings section allows you to select the channel to be configured measurement bandwidth input connection input range and coupling You may set the trigger source and trigger edge on the trigger settings section The trigger source selection consists of Free Run External Channel 1 and Channel 2 Refer to ...

Страница 136: ...e enables you to display the level of each signal harmonic component of the frequency domain analysis 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 ...

Страница 137: ... User s Guide 137 Hold The hold function sets the graph hold configuration type to be used to update the graph data for channels 1 and 2 You can set the hold configuration to none maximum or minimum Figure 6 7 Hold page Figure 6 8 Hold configuration type ...

Страница 138: ...h You can set the threshold level that the marker can identify as a peak or minimum on the graph 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 X axis and Y axis values of the marker will be displayed at the top...

Страница 139: ...e 6 10 Marker menu Using the marker functions you may set the current and reference markers to be placed on the graph for the selected channel The markers can be moved along the graph plot by rotating the knob on the U8903A front panel You also have the option to display the measurement data of the selected marker s in a table as shown in Figure 6 11 NOTE For more information on the marker functio...

Страница 140: ...aph based on the selected current marker position Using the softkeys you may configure the graph area to be displayed by positioning the current marker at either the center start or stop point of the graph plot In addition you can also view the area between the current marker and reference marker by pressing Marker Δ Span To access the Marker menu press on the Graph panel ...

Страница 141: ...he Marker menu is shown as follows Figure 6 12 Marker menu 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 13 Full screen ...

Страница 142: ...6 Frequency and Time Domain Analysis 142 Keysight U8903A User s Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Страница 143: ...Keysight U8903A Audio Analyzer User s Guide 143 7 Sweep Function Sweep 144 This chapter describes the U8903A sweep functions for performing sweep ...

Страница 144: ...ep mode a generator parameter such as frequency amplitude or phase is varied across a certain range At each point of the sweep an analyzer measurement is made The sweep mode allows you to easily collect and plot data for parameters such as frequency response gain compression and amplitude linearity To start the sweep press on the U8903A front panel The Sweep menu is shown as follows Figure 7 1 Swe...

Страница 145: ... points to a file by pressing Save Pts to File To load the sweep points from a file press Load Pts to List The File Manager will be launched to allow you to save or load the sweep points Refer to Chapter 2 Save on page 63 and Recall on page 64 for the information on using the File Manager menu You may also perform sweep using a list of user defined sweep points Refer to Appendix D User defined Swe...

Страница 146: ...Manual Sweep mode is selected The spot parameter panel will change according to the selected waveform type and sweep parameter Refer to Appendix E Spot Parameters on page 166 for the list of spot parameters For the sweep spacing you may select either linear or log interval You may also set the dwell time which represents the delay for each measurement to be taken during the sweep NOTE Multitone an...

Страница 147: ...nce channel for the phase measurement Noise Level is not applicable for the sweep measurement parameter selection 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 or to autoscale the X axis or Y axis Figure ...

Страница 148: ...on 148 Keysight U8903A User s Guide Hold The hold function sets the sweep hold configuration type to be used to update the graph data You can set the hold configuration to none maximum or minimum Figure 7 5 Hold page ...

Страница 149: ... set to Auto Sweep pressing will initiate the sweep from start to end Sweep points are based on the Start Stop and Step Size sweep parameter settings Manual Sweep If the sweep mode is set to Manual Sweep pressing will step the next point of the sweep parameter 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 ...

Страница 150: ...essing will automatically start the sweep in the Auto List mode For Manual List the sweep point will increment each time is pressed List view This function allows you to display the sweep results in list form 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...

Страница 151: ... and output settings as shown in the following figure Figure 7 8 I O settings page Refer to Chapter 3 Input Settings on page 76 Common Settings on page 83 and Output Settings on page 90 for details on the measurement bandwidth input connection and range coupling measurement time as well as the output connection and impedance ...

Страница 152: ...7 Sweep Function 152 Keysight U8903A User s Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Страница 153: ...8903A Audio Analyzer User s Guide 153 8 Specifications For the characteristics and specifications of the U8903A Audio Analyzer refer to the datasheet at http literature cdn keysight com litweb pdf 5990 8499EN pdf ...

Страница 154: ...8 Specifications 154 Keysight U8903A User s Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Страница 155: ...6 90 waveforms 44 45 94 graph menu 56 settings 57 H harmonics 57 help 62 I I O 59 68 input configuration 80 input range 50 54 81 L local 62 M manual sweep list 59 149 marker 60 measurement bandwidth 55 83 category 5 functions 53 113 time 55 84 Mode 94 112 multitone waveform 48 106 N noise level 53 noise signals 48 104 P peak search 60 phase measurement 53 125 power on 25 69 preset 62 66 print 62 R...

Страница 156: ...156 Keysight U8903A User s Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Страница 157: ... Guide 157 Appendixes Appendix A SMPTE IMD and DFD Default Settings 158 Appendix B Arbitrary File Format 159 Appendix C User defined Filter File Format 162 Appendix D User defined Sweep Points File Format 165 Appendix E Spot Parameters 166 ...

Страница 158: ... following table SMPTE 1 1 SMPTE 4 1 SMPTE 10 1 Amplitude ratio of the lower frequency to upper frequency 1 1 4 1 10 1 Upper frequency 7 kHz 7 kHz 7 kHz Lower frequency 60 Hz 60 Hz 60 Hz Amplitude 0 Vrms 0 Vrms 0 Vrms DC offset 0 V 0 V 0 V DFD IEC 60118 DFD IEC 60268 Difference frequency 80 Hz 80 Hz Upper frequency 10 kHz N A Center frequency N A 10 kHz Amplitude 0 Vrms 0 Vrms DC offset 0 V 0 V ...

Страница 159: ...to load an arbitrary file The File Manager will be launched to allow you to select the file to be loaded Once you recall an arbitrary file the waveform preview page will appear as shown in the following example 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 ...

Страница 160: ...at 312 5 kHz Thus the interval between samples is 3 2 μs 1 312 5 Parameter Range Vpeak 0 to 22 6 Vp Balanced output connection 0 to 11 3 Vp Unbalanced or Common output connection DC offset 11 3 V to 11 3 V Points 32 to 32768 points NOTE When the DC offset and amplitude are added together it must not exceed the maximum voltage for the current output connection type For the Balanced output connectio...

Страница 161: ...heir ratio to the maximum Vpeak 2 DC offset 3 Points 0 1 1 5 1 0 2 4 6 4 2 Any of the following conditions may cause an error or warning message to appear Unable to load the sample points as the points may not be a valid float 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 arbi...

Страница 162: ...ponse FIR You need to specify the coefficients or sections as well as group delay for the respective filter type Use the following examples to configure the filter file format The file is saved in the juf format Example of the FIR filter file format Type FIR Delay 10 Coefficients 0 001 0 002 0 003 0 004 0 005 The coefficients of the FIR filter are described as follows 0 001 A 0 0 002 A 1 0 003 A 2...

Страница 163: ...ator 0 021888116917017919 Section 1 Gain1 1 Section 1 A1 0 1 8522189864275376 Section 1 A1 1 0 93977145409560914 Section 1 A1 2 1 Section 1 B1 0 2 Section 1 B1 1 1 Section 1 B1 2 0 020670375338350408 Section 2 Gain2 1 Section 2 A2 0 1 7491711051903651 Section 2 A2 1 0 83185260654376658 Section 2 A2 2 1 Section 2 B2 0 2 Section 2 B2 1 1 Section 2 B2 2 NOTE The IIR filter transfer function H z is de...

Страница 164: ...fficients for the FIR filter type and up to 36 sections for the IIR filter The number of FIR coefficients must not be less than four while the minimum number of sections allowed for 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 separator...

Страница 165: ...ction explains how to configure the user defined sweep points file You may specify the values of the sweep points in a row or column For example 100 200 300 400 500 or 100 200 300 400 500 The file is saved in the csv format NOTE The system will sort the values in ascending order after parsing the file ...

Страница 166: ...Upper Frequency DFD IEC 60268 Difference Frequency Center Frequency DC Gaussian Rectangular Phase Variable Phase Frequency Amplitude Frequency Sine Square Amplitude Frequency 1 Dual Amplitude Frequency 2 Frequency 2 Dual Amplitude Frequency 1 Lower Frequency SMPTE IMD 1 1 4 1 and 10 1 Amplitude Upper Frequency Upper Frequency SMPTE IMD 1 1 4 1 and 10 1 Amplitude Lower Frequency DFD IEC 60118 Ampli...

Страница 167: ...on is subject to change without notice Always refer to the Keysight website for the latest revision Keysight Technologies 2009 2016 Edition 7 April 1 2016 Printed in Malaysia U8903 90002 U8903 90002 www keysight com ...

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