Keysight 3400A RMS Voltmeter

The Keysight 3400A RMS Voltmeter is an analog instrument that delivers accurate true RMS voltage measurements across complex waveforms and high crest factor signals. Its thermal RMS converter enables precise readings from DC through 10 MHz, making it suitable for demanding electronic testing where conventional meters fall short. The meter provides 12 full-scale voltage ranges, dBm measurement capability, and a proportional DC output for system integration.

– Technical Specifications

Voltage Measurement
• 12 ranges: 1 mV to 300 V full scale
• Sensitivity: 1 mV minimum
• Accuracy: 1% of full scale
• Input impedance: 10 MΩ ∥ 40 pF (0.001–0.3 V range); 10 MΩ ∥ 15 pF (1.0–300 V range)
• Maximum input: 1000 V peak; 30 dB per range or 1000 V peak, whichever is less

Frequency Response
• Bandwidth: 10 Hz to 10 MHz

dBm Measurement
• Range: −72 to +52 dBm
• Reference: 0 dBm = 1 mW into 600 Ω
• Option 001 expands the dB scale to the top meter position

Crest Factor Performance
• 10:1 crest factor supported at full scale for 1% duty cycle pulses
• 100:1 crest factor (0.01% duty cycle) measurable at 1/10 full scale

Electrical
• Power: 115 or 230 V AC (±10%), 50–60 Hz
• Dissipation: ~7 watts
• Line fuse: 0.25 A fast-blow type

Output & Response
• DC output proportional to meter reading
• Response time: <2 seconds to 1% of final value

– Key Features

• True RMS measurement insensitive to waveform shape
• High crest factor capability for pulse and modulated signal analysis
• Wide frequency coverage from 10 Hz to 10 MHz
• Dual meter scales: voltage (0.1–300 V) and decibels (−12 to +2 dBm)
• Individually calibrated meter movement for accuracy

– Typical Applications

• Measurement of complex and distorted AC signals in power electronics
• Pulsed signal characterization in RF and microwave testing
• dBm power level monitoring in 600 Ω systems
• Bench-level precision voltage monitoring across industrial and communications equipment

– Compatibility & Integration

The 3400A integrates into modular instrument systems through benchtop combining cases or the optional Adapter Frame (Part No. 5060-0797) for rack mounting. The proportional DC output enables integration with data acquisition and automated test systems.