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Agilent U8903A Audio Analyzer
Make an Audible Difference
Data Sheet
Capabilities
Select generator, analyzer, graph and sweep modes with one-button access Measure at DC and from 10 Hz to 100 kHz Characterize signal-to-noise ratio, SINAD, IMD, DFD, THD+N ratio, THD+N level, crosstalk, and more Apply weighting functions, standard filters and custom filters Stimulate your device with high-quality signals and arbitrary waveforms View numerical and graphical displays of measurement results Connect to a PC through GPIB, LAN and USB interfaces Whether listening to mono, stereo or surround, the human ear knows what sounds good. Measuring "how good," however, can be a challenge. The Agilent U8903A audio analyzer helps you measure and quantify audio performance in applications such as wireless audio, analog components and ICs, and consumer audio. Across the audio spectrum and beyond, this scalable, single-unit solution provides versatile measurement functions, diverse test signals and powerful analysis capabilities. Whatever your application, the U8903A can help you make an audible difference in device performance.
Step up from the HP 8903B
The U8903A is the next-generation replacement for the widely used HP 8903B audio analyzer. Application note `Migrating Code from the 8903B to U8903A (5990-4135EN)' provides compatible equivalent commands, and sample test programs comparing the old R2D2 codes with new U8903A SCPI commands'.
The U8903A audio analyzer combines the functionality of a distortion meter, SINAD meter, frequency counter, AC voltmeter, DC voltmeter and FFT analyzer with a lowdistortion audio source. On the bench or in a test system, its accuracy and versatility will help you make an audible difference in your end product.
Generate high-quality test signals
The built-in, dual-channel signal generator lets you stimulate your device with a variety of highquality signals: sine (-105 dB noise floor), square, rectangular, noise (Gaussian and rectangular), two-tone and multi-tone (up to 60) (Figure 3). To simulate complex and real-world signals, you can also create arbitrary waveforms with up to 16,384 points and a 321.5 kHz sampling rate. The output voltage range is 0 V to 8 Vrms with 1% accuracy. For unbalanced connections, you can select 50 W or 600 W output impedance.
Measure and analyze essential audio parameters
With the U8903A, you can measure below, across and above the audio spectrum with its 10 Hz to 100 kHz frequency range and built-in DC measurements. Its dual input channels let you perform stereo audio, frequency response, wireless and component tests--all at a singlechannel price. Easily characterize parameters such as signalto-noise ratio, SINAD, intermodulation distortion (IMD), different-frequency distortion (DFD), total harmonic distortion (THD+N ratio, THD+N level), crosstalk and more. Additional measurement capabilities include AC level, DC level, frequency count and frequency spectrum (through FFT analysis; see Figure 1). For all measurements, you can apply weighting functions as well as low-pass, high-pass and standard filters (Figure 2). You can also create custom filters using MATLAB(R) and other applications and upload them through the analyzer's USB port. Filters and weighting functions can be applied one, two or three at a time.
Figure 1: Perform FFT analysis with up to 32 Kpoints and a wide selection of informative graphing functions. Figure 2: Apply an extensive selection of filters, including a variety of weighting functions.
Figure 3: Utilize high-quality test signals that provide low distortion and low noise level.
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Easily perform manual and automated tests
One-button access makes it easy to select the four main operating modes: analyzer, generator, graph and sweep. The 5.7-inch color display provides numeric readouts as well as graphical views of analog sweeps, FFT spectra and more.
Figure 4: The new U8903A audio analyzer offers numerous improvements over the widely used HP 8903B.
For PC-based control on the bench or in a test system, the U8903A includes GPIB, LAN and USB interfaces. If your system currently uses an HP 8903B audio analyzer, the application note `Migrating Code from the 8903B to U8903A (5990-4135EN)' describes compatible equivalent commands, and provides sample test programs comparing the old R2D2 codes with new U8903A SCPI commands'.
Frequency range Frequency accuracy
U8903A DC and 10 Hz to 100 kHz 5 ppm (0.0005%)
HP 8903B 20 Hz to 100 kHz 0.004%
Table 1: Comparison of frequency range and accuracy
Replace your 8903B and add next-generation capabilities
For nearly two decades, the HP 8903B provided unparalleled versatility and performance in audio applications. Today, the U8903A audio analyzer builds on the legacy of the 8903B by offering faster single-point measurements (0.4 sec vs. 3.0 sec) as well as a wider frequency range, expanded performance and greater functionality (Tables 1, 2 and 3). Because the U8903A is based on the latest digital technologies, we also predict greater instrument uptime on the bench and in test systems. With the U8903A, you can configure measurements faster through its graphical user interface (GUI) and one-button selection of major operating modes. The color screen lets you view dual-parameter displays from one or two channels as well as graphical displays of sweeps, frequency spectra and more (Figure 4).
AC voltage input range AC accuracy DC voltage input range DC accuracy
U8903A 0 V to 140 Vrms 1% 0 to 200 V 1%
HP 8903B 0.3 mVrms to 300 Vrms 4% 4 V to 300 V 1%
Table 2: Comparison of accuracy and ranges in AC and DC level measurements
Frequency range Residual THD+N (signal distortion) at 80 kHz BW
U8903A 10 Hz to 100 kHz ~ -101 dB (at 1kHz, 1Vrms), 20 Hz to 20 kHz
HP 8903B 20 Hz to 100 kHz -80 dB (or 15 V), 20 Hz to 20 kHz
Table 3: Comparison of range and residual THD+N measurements
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Take a closer look
Front panel
5.7-inch color display One-button access to analyzer, generator and sweep modes Front-panel output on/off button for DUT protection
Quick buttons for graphical analysis Plug-and-play USB 2.0 connectivity
Softkeys for easy function selection
Dual-channel generator outputs and analyzer inputs with XLR connectors
Rear panel
GPIB, LAN and USB interfaces
Upgraded rear panel
The next release of the U8903A will include multi-channel measurement capabilities designed for the testing of consumer audio products. Total channel count will expand from two to eight with the additional six inputs and outputs accessible through the rear panel of the instrument. For the latest information, please visit www.agilent.com/find/audioanalyzer.
Two DB-25 connectors for multi-channel connections
Six additional input and output channels
DB-25-to-XLR cable
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Address challenging audio applications
General audio testing
The U8903A provides essential measurement capabilities that enable efficient analysis of audio amplifiers and other devices in the audio chain. For example, the analyzer includes balanced and unbalanced outputs and inputs. It also provides a wide selection of filters and enhances your flexibility by making it easy to upload customized filters. With an array of sweep functions and flexible data display formats for each measurement, you'll be ready to address a wide range of challenging audio applications.
Balanced inputs
In the quest for higher output power, many audio amplifiers use bridged output stages. Such amplifiers can be difficult to characterize because their outputs cannot be grounded. To test these devices, the usual approach has been to use a balanced, calibrated isolation transformer connected to an analyzer with an unbalanced input. The widely used HP 8903B eliminated the need for a transformer, but it was still necessary to float the analyzer input before connecting the bridged device and making measurements. With Agilent U8903A, you simply make a balanced connection with an XLR connector and make measurements--no floating required.
Amplifier testing
Standard and custom filters
A selection of built-in filters simplifies audio measurements by providing weighting networks required by international standards. These include CCIR, CCIR/ARM and CCIT weighting filters; a C message filter; and an ANSI "A" weighting filter. In addition to the standard filters, you can create custom filters using applications such as MATLAB or Agilent VEE and upload the filters through the analyzer's USB port. The U8903A also includes selectable 15 kHz, 20 kHz and 30 kHz low-pass filters to reject unwanted out-of-band signals and noise.
Generator output
Analyzer input
Audio amplifier
Display scaling and formatting
U8903A gives you flexible control over data displays. For example, you can choose volts, millivolts, dBm into 600 ohms (or other resistance values), or watts for AC level measurements, and select percent or dB for distortion measurements.
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Address challenging audio applications (continued)
Swept measurements
With its internal audio source and precise digital control, the U8903A can perform automatic swept measurements of frequency response, distortion and signal-to-noise. For example, to check the frequency response of an active filter, only a few steps are required. After connecting the device and setting the required source level, simply enter the start and stop frequencies, and then press the "Sweep" key (Figure 5).
Figure 5: Use a single button to access the swept measurement mode.
Transmitter and receiver testing
The U8903A includes several measurement features that simplify the testing of the transceivers used in devices such as car radios, telephones, mobile radios, broadcast radios, FM tuners and television. The U8903A can handle all of these applications when combined with a modulating signal generator for receiver testing and a signal analyzer for transmitter testing (see diagrams).
Receiver testing
Signal generator
Modulated signal Two-way radio
Generator output
Analyzer input
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Address challenging audio applications (continued)
Transmitter testing
Spectrum analyzer
Generator output Two-way radio
Modulated signal
True-RMS detection
To accurately characterize signals with high noise content, true-RMS detection is required. The U8903A employs true-RMS detection for all signals with crest factor less than three. In addition, quasi-peak detection (CCIR 468-4) and peak-to-peak detection are also available through softkey selections.
SINAD measurements
Commonly used to test FM receivers, SINAD measurements must be made repeatedly when checking receiver sensitivity or adjacentchannel selectivity. To smooth out the typically noisy signals that are present during receiver testing, the analyzer's SINAD mode employs extra filtering circuits. These have been optimized for high speed and excellent repeatability: The U8903A provides distortion and SINAD measurements with an acquisition time of less than 1.5 seconds and a measurement rate of greater than two reading per second after locking.
Built-in filters
The U8903A includes a variety of essential filters for transmitter and receiver testing. Its CCITT, CCIR, and C-message weighting filters meet international standards for receiver testing. For transmitter testing, the seven-pole 400 Hz high-pass filter provides better than 40 dB rejection of signals up to 250 Hz, letting you measure transmitter audio distortion to 1% without disabling squelch signals. For even greater flexibility, you can apply custom filters created using applications such as MATAB and Agilent VEE. Once you've uploaded a filter via the U8903A's USB port, it can be applied to your measurements through a softkey selection. In all, you can apply up to three filters at a time.
Signal-to-noise ratio
To characterize signal quality in AM receivers, the U8903A can automatically make the necessary signal-to-noise ratio measurements. It does this by monitoring the incoming AC signal level while turning its low-distortion source on and off.
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Characteristics
Power Consumption 250 VA Power Requirements * 100 Vac to 240 Vac * 47 Hz to 63 Hz Operating Environment * Operating temperature from 0 C to 55 C * Relative humidity at 30% to 80% RH (noncondensing) * Altitude up to 3000 m * Pollution Degree 2 * Installation Category II Storage Compliance -55 C to 75 C Safety Compliance Certified with: * IEC 61010-1:2001/EN61010-1:2001 (2nd Edition) * 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 x D x H) 426.80 x 405.00 x 141.35 mm Weight < 7.5 kg (without cards) Warranty One year for U8903A Three months for standard-shipped accessories (see page 13)
Specifications
The following specifications are based on performance with a 30 minutes warm-up time and at a temperature from 0 C to 55 C unless stated otherwise.
Audio generator
Generated waveform Sine, Dual Sine, And Variable Phase Frequency Range Accuracy Resolution Output Range (Balanced) Range (Unbalanced/Common) Amplitude accuracy Amplitude resolution Sine, Dual sine, Variable Phase, Square, Noise (Gaussian and Rectangular), Arbitrary, DC, Multitone, SMPTE IMD (1:1, 4:1, and 10:1), DFD (IEC 60118/IEC 60268)
5 Hz to 80 kHz 5 ppm 0.1 Hz 0 V to 16 Vrms 0 V to 8 Vrms 1% 1 Vrms (limited to five digits of resolution)
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Specifications (continued)
Flatness 20 Hz to 20 kHz 5 Hz to 80 kHz THD + N at 1 kHz, 1 Vrms, 20 Hz to 20 kHz bandwidth Dual sine ratio range Phase Sweep Square Frequency Range Output Range (Balanced) Range (Unbalanced/Common) Rise time SMPTE IMD (1:1/4:1/10:1) Frequency Low frequency (LF) tone High frequency (HF) tone Output Range (Balanced) Range (Unbalanced/Common) Mixed ratio (LF:HF) Residual IMD (20 Hz to 20 kHz) Sweep DFD (IEC 60118/IEC 60268) Frequency Difference frequency Upper frequency Center frequency Output Range (Balanced) Range (Unbalanced/Common) Inherent distortion (20 Hz to 20 kHz) Sweep Arbitrary/Multitone Sample rate Length Maximum number of tones Noise Type Output Range (Balanced) Range (Unbalanced/Common) DC Output Range (Balanced) Range (Unbalanced/Common) Amplitude accuracy 0.01 dB 0.1 dB ~ -95 dB (at 23 C 5C) ~ -92 dB (from 0 C to 18 C and 28 C to 55 C) 0 dB to 100 dB -180 to 179.99 Frequency, amplitude, phase
5 Hz to 30 kHz 0 V to 45.2 Vpp 0 V to 22.6 Vpp < 2 s
40 Hz to 500 Hz 2 kHz to 60 kHz 0 V to 16 Vrms 0 V to 8 Vrms 10:1, 4:1, or 1:1 ~ -92 dB Upper frequency, lower frequency, amplitude
80 Hz to 2 kHz 3 kHz to 80 kHz 3 kHz to 79 kHz 0 V to 16 Vrms 0 V to 8 Vrms ~ -101 dB Upper frequency, center frequency, amplitude 312.5 kHz 32 to 32768 points/channel (Length/2) - 1 Gaussian, Rectangular 0 V to 7.2 Vrms (Gaussian), 0 V to 13.16 Vrms (Rectangular) 0 V to 3.6 Vrms (Gaussian), 0 V to 6.58 Vrms (Rectangular)
-22.6 V to 22.6 V -11.3 V to 11.3 V 1.5%
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Specifications (continued)
DC Offset Applicable for all waveform types except Variable Phase, DC, and Square Output level -11.3 V to 11.3 V Range 1.5% Amplitude accuracy Output Characteristics Connection type XLR Balanced BNC Unbalanced XLR Common mode Impedance 100 W, 600 W Balanced 50 W, 600 W Unbalanced 50 mA Output current limit (typical) Maximum output power into 600 W 20 dBm Balanced (600 W) 14 dBm Unbalanced (600 W) Crosstalk ~ -101 dB (at 23 C 5 C) 20 Hz to 20 kHz ~ -99 dB (from 0 C to 18 C and 28 C to 55 C) 20 kHz to 80 kHz ~ -85 dB
Audio analyzer
Input Characteristics Connection type Balanced Unbalanced Coupling Measurement bandwidth Low High Input ranges Measurement range Maximum rated input Impedance Balanced Unbalanced Flatness 20 Hz to 20 kHz 20 kHz to 100 kHz THD + N at 1 kHz, 1 Vrms, 20 Hz to 20 kHz bandwidth CMRR ~ 20 kHz (input range ~ 6.4 V) ~ 20 kHz (input range > 6.4 V) Crosstalk 20 Hz to 20 kHz Input protection
XLR BNC DC, AC 30 kHz 100 kHz 400 mV to 140 Vrms < 1 V [1] to 140 Vrms 200 Vp for altitude up to 3000 m 200 kW 100 kW 0.01 dB [2] (at 23 C 5 C) 0.012 dB [3] (from 0 C to 18 C and 28 C to 55 C) 0.1 dB (at 23 C 5C) 0.15 dB (from 0 C to 18 C and 28 C to 55 C) ~ -101 dB
70 dB 40 dB
[4] [4]
~ -101 dB Overload protection for all ranges, onscreen warning message on the front panel
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Specifications (continued)
Triggering Type Level Minimum trigger high voltage Maximum trigger low voltage Input impedance Amplitude DC measurement range DC accuracy AC accuracy (20 Hz to 100 kHz) AC level detection Frequency Range Minimum input Accuracy Resolution Phase Accuracy < 20 kHz < 100 kHz Minimum input Resolution SMPTE IMD Residual IMD Free Run, External 5V 1.25 V 0.5 V > 50 kW 0 to 200 V 1% 1% (at 23 C 5 C) 2% (from 0 C to 18 C and 28 C to 55 C) RMS, Peak-to-Peak, Quasi Peak 10 Hz to 100 kHz 1 mV (S/N > 40 dB) 5 ppm 6 digits
2 4 1 mV (S/N > 40 dB) 0.01
~ 0.0025% (-92 dB)
[1] Defined by 24-bit measurement. [2] 0.01 dB - 0.001 dB/Hz below 50 Hz. [3] 0.012 dB - 0.001 dB/Hz below 50 Hz. [4] When AC coupled, CMRR will deteriorate at low frequencies.
Graph mode
Size/Acquisition length Window Amplitude accuracy (Flattop window) Display mode Time domain Frequency domain 256, 512, 1024, 2048, 4096, 8192, 16384, 32768 Rectangular, Hann, Hamming, Blackman-Harris, Rife-Vincent 1 and 3, Flattop 0.1 dB ( 1.2%) Normal, Interpolate, Peak, Absolute Value Displays highest FFT bin between graph points
Audio filters
Low pass filter * * * * * * * * * * * * * * 15 kHz low pass 20 kHz low pass 30 kHz low pass User-defined [1] 20 Hz high pass 100 Hz high pass 400 Hz high pass User-defined [1] A-Weighting (ANSI-IEC "A" weighted, per IEC Rec 179) 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] 11
High pass filter
Weighting filter
[1] User-defined filters can be uploaded through standard I/O connections.
Specifications (continued)
Sweep capability
Frequency Sweep (Sine And Dual Sine Waveforms) Start point 5 Hz to 80 kHz Stop point 5 Hz to 80 kHz Amplitude spot value (Balanced) 0 V to 16 Vrms Amplitude spot value (Unbalanced/Common) 0 V to 8 Vrms Frequency Sweep (Square Waveform) Start point 5 Hz to 30 kHz Stop point 5 Hz to 30 kHz Amplitude spot value (Balanced) 0 V to 22.6 Vrms Amplitude Spot Value (Unbalanced/Common) 0 V to 11.3 Vrms Frequency Sweep (SMPTE IMD 1:1/4:1/10:1 Waveform) Start point (Upper frequency) 2 kHz to 60 kHz Start point (Lower frequency) 40 Hz to 500 Hz Stop point (Upper frequency) 2 kHz to 60 kHz Stop point (Lower frequency) 40 Hz to 500 Hz Amplitude spot value (Balanced) 0 V to 16 Vrms Amplitude spot value (Unbalanced/Common) 0 V to 8 Vrms Frequency Sweep (DFD IEC 60118/IEC 60268 Waveform) Start point (Upper frequency) 3 kHz to 80 kHz Start point (Center frequency) 3 kHz to 79 kHz Stop point (Upper frequency) 3 kHz to 80 kHz Stop point (Center frequency) 3 kHz to 79 kHz Amplitude spot value (Balanced) 0 V to 16 Vrms Amplitude spot value (Unbalanced/Common) 0 V to 8 Vrms Difference frequency spot value 80 Hz to 2 kHz Voltage Sweep Start point (Balanced) 0 V to 16 Vrms [1] Start point (Unbalanced/Common) 0 V to 8 Vrms [1] Stop point (Balanced) 0 V to 16 Vrms [1] Stop point (Unbalanced/Common) 0 V to 8 Vrms [1] Frequency spot value (Sine and Dual 5 Hz to 80 kHz sine waveforms) Frequency spot value (Square waveform) 5 Hz to 30 kHz Frequency spot value 40 Hz to 500 Hz (lower frequency), 2 kHz to 60 kHz (upper frequency) (SMPTE IMD 1:1/4:1/10:1 waveform) Frequency spot value 3 kHz to 80 kHz (upper frequency), 3 kHz to 79 kHz (center frequency), (DFD IEC 60118/IEC 60268 waveform) 80 Hz to 2 kHz (difference frequency) DC Sweep Start point (Balanced) -22.6 V to 22.6 V Start point (Unbalanced/Common) -11.3 V to 11.3 V Stop point (Balanced) -22.6 V to 22.6 V Stop point (Unbalanced/Common) -11.3 V to 11.3 V Phase Sweep Start point -180 to 179.99 Stop point -180 to 179.99
[1] This range is applicable for sine wave only.
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Ordering Information
Model Number U8903A - 200 Description 2-channel audio analyzer
Standard-shipped accessories
LAN and USB cables, power cord, Product Reference CD-ROM (contains U8903A Quick Start Guide and User Guide), Quick Start Guide, 1GB USB Flash Memory device and Certificate of Calibration.
Optional accessories
U8903A - 101 Male BNC to Male BNC cable;1.2 m
U8903A - 102 Male BNC to Male RCA cable; 2m
U8903A - 103 Male XLR to Female XLR cable; 2m
U8903A - 908 Rack mount kit - standard 3U U8903A - ABJ Japanese User Guide (hardcopy)
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Make an audible difference
In audio applications, measuring "how good" is fast, easy and accurate with the Agilent U8903A audio analyzer. Across the audio spectrum and beyond, this single-unit solution provides versatile measurement functions, diverse test signals and powerful analysis capabilities for bench and test-system use. For applications in wireless audio, analog components and ICs, consumer audio, and beyond, the U8903A can help you make an audible difference in your end product.
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Product specifications and descriptions in this document subject to change without notice.
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Revised: October 6, 2008
(c) Agilent Technologies, Inc. 2009 Printed in USA, July 3, 2009 5990-3831EN

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