Keysight / Agilent / HP 8903A Audio Analyzer

The Keysight/Agilent/HP 8903A Audio Analyzer combines a low-distortion programmable oscillator, high-performance distortion analyzer, frequency counter, and AC/DC voltmeters into a single instrument. It delivers distortion measurements down to <0.003% and residual distortion as low as –101 dB, making it ideal for characterizing audio equipment across manufacturing, service, and development environments. The analyzer integrates true RMS AC measurement, SINAD and signal-to-noise ratio analysis, and programmable filtering to streamline audio system validation and eliminate setup complexity.

## Technical Specifications

**Oscillator**
• Frequency range: 20 Hz to 100 kHz (0.1 Hz resolution)
• Output level: 0.3 Vrms to 300 Vrms (±1% accuracy, 20 Hz to 50 kHz)
• Distortion: <0.003% typical (combined source and analyzer at 1 V, 20 Hz to 20 kHz)
• Residual distortion + noise: <–80 dB (source), <–101 dB (analyzer, 20 Hz to 20 kHz)

**Distortion & SINAD Measurement**
• Distortion measurement range: <0.003%
• SINAD range: 0 to 99.99 dB (0.01 dB resolution)
• Signal-to-noise ratio: 0 to 99.99 dB; display range –999.999 dB to 0 dB

**AC Voltmeter**
• True RMS detector; range: 0.3 mV to 300.0 V
• Accuracy: 4% of reading (50 mV), both 20 Hz to 20 kHz
• Bandwidth: >500 kHz (–3 dB)

**Frequency Counter**
• Range: 20 Hz to 150 kHz (5-digit resolution)
• Accuracy: 0.004 + 1 digit
• Input sensitivity: 50 mV (distortion/SINAD modes); 5.0 mV (AC level/sig-noise modes)

**Filters**
• 400 Hz high-pass (40 dB/decade rolloff, >68 dB rejection)
• 30 kHz low-pass (12 dB/decade rolloff)
• 80 kHz low-pass (60 dB/decade rolloff)
• CCITT psophometric filter

**Interfaces**
• HP-IB (GPIB) for ATE integration

## Key Features

• Programmable rapid source mode for multi-frequency test sequences
• Analog and digital meter indication for simultaneous monitoring
• DC voltmeter for bias level measurement
• Reciprocal frequency counting with packed four-byte output capability

## Typical Applications

• Audio equipment manufacturing test and characterization
• Distortion, noise, and signal integrity validation
• Codec and transducer performance verification
• Service and calibration workflows

## Compatibility & Integration

HP-IB interface enables integration into automated test systems and production floor implementations.