The Keysight U8903A is a dual-channel audio analyzer and signal generator for comprehensive analog and digital audio testing. It consolidates distortion metering, SINAD analysis, frequency counting, AC/DC voltage measurement, and FFT analysis into a single instrument, eliminating the need for multiple tools on the test bench. Designed as the successor to the HP 8903B, the U8903A delivers faster measurement speed, expanded functionality, and improved performance across product development, quality control, and maintenance workflows.
Technical Specifications
Measurement Range and Accuracy
• Frequency range: DC to 100 kHz
• Frequency accuracy (generator and analyzer): 5 ppm
• Amplitude accuracy (generator and analyzer): ±1%
• Analyzer residual distortion + noise: −101 dB (20 Hz to 20 kHz)
Analysis Functions
• Signal-to-noise ratio (SNR), SINAD, intermodulation distortion (IMD), and different-frequency distortion (DFD)
• Total harmonic distortion + noise (THD+N) as ratio and level
• Crosstalk and AC/DC level measurements
• Frequency counting and spectrum analysis
• FFT analysis up to 32,768 points
• Configurable low-pass and high-pass filters with CCITT, CCIR, and C-message weighting; user-defined filters uploadable via USB
Audio Generator
• Output voltage: 0 V to 8 Vrms
• Output impedance: selectable 50 Ω or 600 Ω (unbalanced)
• DC offset: 0 to ±250 mV
• Arbitrary waveform generation: up to 32,768 points at 312.5 kHz sampling rate
• Frequency-locked generator capability
Digital Audio Interfaces
• AES3/SPDIF (consumer and professional) and digital serial interface (DSI) support
• DSI formats: I²S, left justified, right justified, DSP
• Audio bit depth: 8-bit to 24-bit
• AES3/SPDIF sampling rate: 28 kHz to 205 kHz
• DSI sampling rate: 6.75 kHz to 400 kHz
• DSI logic level input: 1.2 V to 3.3 V
• Balanced I/O level: 0.3 Vpp to 5.1 Vpp; unbalanced: 0.3 Vpp to 2.5 Vpp
– Key Features
• 5.7-inch color LCD display with numerical and graphical results
• Two-channel analog and digital measurements (upgradeable to eight channels)
• Four measurement modes: generator, analyzer, graph, and sweep
• High-distortion audio source integrated with analyzer
– Typical Applications
IC component testing, audio module design, wireless audio assessment, and consumer electronics quality assurance.
– Compatibility & Integration
USB connectivity for filter uploads and instrument control.
