The Keysight (Agilent) 8903E is a distortion analyzer that combines measurement functions for audio and electronic signal characterization across 20 Hz to 100 kHz. This single instrument integrates distortion analysis, SINAD measurement, frequency counting, AC/DC voltage measurement, and signal-to-noise analysis—eliminating the need for multiple benchtop units. True-rms detection captures complex waveforms and noise accurately, with selectable average (RMS calibrated) and quasi-peak detection modes. Most measurements execute with one or two keystrokes, while automatic tuning and autoranging optimize accuracy without manual intervention. Input frequency displays in all AC measurement modes for rapid signal identification.
Technical Specifications
Distortion Measurement
• Fundamental frequency range: 20 Hz to 100 kHz
• Bandwidth options: 80 kHz or 500 kHz
• Residual distortion and noise (80 kHz BW): −80 dB or 15 µV (20 Hz to 20 kHz)
• Residual distortion and noise (500 kHz BW): −70 dB or 45 µV (20 Hz to 50 kHz); −65 dB or 45–50 µV (50–100 kHz)
• Accuracy: ±1 dB (20 Hz to 20 kHz)
• Display range: 0.001% to 100% (−99.99 to 0 dB)
• Flatness: ±0.7% (±0.06 dB) at 1 kHz reference (20 Hz to 20 kHz)
SINAD & AC Level Measurement
• SINAD range: 0 to 99.99 dB; accuracy ±1 dB (20 Hz to 20 kHz)
• AC level: 50 mV to 300 V input; accuracy ±2% (20 Hz to 20 kHz)
• DC level: 600 mV to 300 V; accuracy ±1.0% of reading (±6 mV below 600 mV)
Frequency Measurement
• Range: 20 Hz to 150 kHz overall (20 Hz to 100 kHz in distortion/SINAD modes)
• Resolution: 5 digits (0.01 Hz below 100 Hz)
• Accuracy: ±(0.004% + 1 digit)
• Sensitivity: 50 mV (distortion/SINAD); 5 mV (AC level/signal-to-noise)
Filters
• Standard: 30 kHz and 80 kHz low-pass
• Optional: 400 Hz high-pass (Opt 010/050); CCITT and CCIR weighting filters (Opt 011/051)
– Key Features
• True-rms detection with average and quasi-peak alternatives
• Multi-function integration: distortion, SINAD, frequency counter, voltmeter
• Autoranging and automatic tuning
• Seven AC voltage ranges from 0.3 mV to 300 V full scale
– Typical Applications
R&D audio characterization, manufacturing acceptance testing, field service measurements, and signal quality assessment in communications and industrial electronics.
