The Agilent/Keysight 339A is a distortion measurement set that combines a low-distortion sine wave oscillator, a high-resolution THD analyzer, and a true RMS voltmeter in a single benchtop instrument. It delivers comprehensive signal analysis across a wide frequency spectrum, with particular strength in measuring total harmonic distortion and individual harmonic content. The instrument integrates automatic nulling and level-setting functions to streamline measurement workflows in electronics testing, circuit characterization, and quality control.
Technical Specifications
Oscillator
• Frequency range: 10 Hz to 110 kHz (four overlapping decade ranges with 2-digit resolution)
• Frequency accuracy: ±2% of selected frequency (FREQUENCY VERNIER in CAL position)
• Output level: 3 V RMS into 600 Ω load
• Level control: 10 dB/step with 10 dB VERNIER adjustment
• Level flatness: +0.1 dB (20 Hz to 20 kHz); ±0.2 dB (10 Hz to 110 kHz)
• Output impedance: 600 Ω ±5%
Distortion Analyzer
• Fundamental frequency range: 10 Hz to 110 kHz with simultaneous tuning to oscillator
• Distortion measurement range: 0.01% to 100% full scale (-80 dB to 0 dB) across nine ranges
• THD measurement capability: 0.0018% minimum over 10 Hz to 110 kHz (including harmonics to 330 kHz)
• Residual noise: <-92 dB referenced to 1 V (fundamental <20 kHz, 80 kHz filter engaged, source ≤1 kΩ shielded)
• Active filters: 30 kHz low-pass (FCC broadcast band limiting), 80 kHz low-pass (high-frequency noise reduction), 400 Hz high-pass (line frequency hum rejection)
• AM detector: 550 kHz to 1.6 MHz frequency response for modulation distortion measurement
• Auto set level: 10 dB range with LED indicator for INPUT RANGE adjustment guidance
• Auto nulling: Fully automatic with internal oscillator as signal source
– Key Features
• Simultaneous oscillator and analyzer frequency tuning eliminates manual retuning
• OSC LEVEL position allows oscillator output verification without breaking test connections
• OFF position terminates oscillator output in 600 Ω for signal-to-noise measurements
• Harmonic analysis extends to 300 kHz with full specification compliance
– Typical Applications
• Amplifier and filter characterization across audio to ultrasonic frequencies
• Broadcast equipment verification and FCC compliance testing
• Power supply ripple and noise analysis
• Audio equipment distortion profiling
– Compatibility & Integration
The instrument operates as a standalone benchtop unit with internal signal generation and analysis. The 600 Ω source and load impedances align with broadcast and audio industry standards.
