Agilent/Keysight 340A

The Agilent/Keysight 340A is a True RMS AC voltmeter engineered for precise voltage measurements across extended frequency ranges in research, development, and manufacturing environments. This instrument delivers frequency-independent accuracy and high input impedance, making it suitable for low-level signal detection and impedance-critical measurements.

– Technical Specifications

Measurement Range
• Voltage: 1 mV to 300 V (12 ranges, full scale)
• Frequency: 10 Hz to 10 MHz
• dB Range: −72 dBm to +52 dBm (referenced to 1 mW into 600 Ω)
• Input Impedance: 10 MΩ

Accuracy
The 340A maintains frequency-dependent accuracy across its operating band:
• ±5% of full scale (10 Hz to 50 Hz)
• ±1% (50 Hz to 1 MHz)
• ±2% (1 MHz to 2 MHz)
• ±3% (2 MHz to 3 MHz)
• ±5% (3 MHz to 10 MHz)

– Key Features

• True RMS measurement capability for accurate AC voltage readings on complex waveforms
• 12 discrete voltage ranges accommodate both low-level millivolt and high-voltage applications
• Decade accuracy specifications enable direct measurement without correction factors across standard audio and RF frequency bands
• High input impedance minimizes loading effects on sensitive circuits and high-impedance sources
• Direct dB readout referenced to 600 Ω impedance standard, eliminating manual conversion

– Typical Applications

The 340A addresses applications requiring accurate True RMS measurements at audio and RF frequencies: precision AC voltage characterization in audio systems, RF test and development, telecommunications signal level monitoring, and general-purpose laboratory AC measurement where frequency-dependent accuracy is required.

– Compatibility & Integration

Status: This product is obsolete and no longer sold by Keysight. Historical manuals remain available for reference and operational guidance.