The Agilent/Keysight 3400B is a true RMS analog voltmeter engineered for precision AC voltage and decibel measurements across audio and RF frequencies. It delivers accurate RMS readings on sinusoidal and non-sinusoidal waveforms, making it essential for broadband noise characterization, fast-rise pulse analysis, and high-frequency signal assessment. The instrument combines wide dynamic range with frequency-dependent accuracy specifications, enabling reliable measurements in demanding RF and audio test environments.
Technical Specifications
Measurement Ranges & Resolution
• Voltage: 1 mV to 300 V full scale across 12 ranges
• Decibel: −72 dBm to +52 dBm (0 dBm = 1 mW into 600 Ω)
• Frequency response: 10 Hz to 20 MHz
Measurement Performance
• True RMS response for all waveforms, including non-sinusoidal signals
• Crest factor handling: up to 10:1 at full scale; up to 100:1 at 10% of full scale
• Frequency-dependent accuracy (within 20°C to 30°C): ±5% FS (10–50 Hz), ±1% (50 Hz–1 MHz), ±2% (1–2 MHz), ±3% (2–3 MHz), ±5% (3–10 MHz)
• Response time: < 5 seconds to final value for step function input
Input Specifications
• Input impedance: 10 MΩ shunted by < 50 pF (1–300 mV ranges, AC-coupled); 10 MΩ shunted by < 20 pF (1–300 V ranges, AC-coupled)
• Maximum continuous input: 30 dB above full scale or 800 Vpeak, whichever is less, per range
• Maximum DC input: 600 Vdc on all ranges; tolerates 500 Vac peak at 1 kHz
Output
• DC output: 0 to 1 V linear, proportional to meter deflection; drives auxiliary equipment or functions as RMS ac-to-dc converter
– Key Features
• AC-coupled input design minimizes DC offset sensitivity
• AC-coupled architecture across all voltage ranges
• Bench or rack-mount configuration options available
– Typical Applications
• Audio frequency signal measurement and verification
• RF broadband noise floor assessment
• Fast-rising pulse characterization
• Decibel-based power and level measurements
– Compatibility & Integration
Direct form, fit, and function replacement for the HP 3400A voltmeter.
