Agilent/Keysight 3406A

The Agilent/Keysight 3406A is a broadband sampling voltmeter engineered for high-frequency RF measurements from 10 kHz to 1.2 GHz. Using sampling techniques, it resolves signals as small as 50 µV across eight voltage ranges (1 mV to 3 V full scale) with 20 µV resolution on the 1 mV range. The instrument delivers ±3% accuracy between 100 kHz and 100 MHz, and ±8% accuracy from 700 MHz to 1 GHz. Beyond RF voltage measurement, the 3406A accepts a clip-on transducer probe for DC current measurement from 1 mA to 10 A full scale across nine ranges, with ±3% accuracy plus ±0.15 mA at calibration. The magnetic field sensing approach provides DC isolation without circuit contact. Low-frequency current up to 400 Hz can be monitored via front panel output to an external oscilloscope or voltmeter. Front panel output delivers variable linear response with a calibrated 1 V setting at full-scale deflection. A proportional DC recorder output (0 to 1.2 mA into 1000 Ω) tracks meter deflection. The instrument operates from 0°C to 55°C and draws 71 W from 115 or 230 V ±10%, 48–440 Hz mains. Housed in a compact 292 mm H × 191 mm W × 368 mm D chassis weighing 8.6 kg net.

– Technical Specifications

• Measurement Type: Broadband sampling voltmeter
• RF Bandwidth: 10 kHz to 1.2 GHz
• Voltage Ranges: 1 mV to 3 V full scale (8 ranges)
• Voltage Sensitivity: 50 µV minimum resolvable signal; 20 µV resolution (1 mV range)
• Voltage Accuracy: ±3% full scale (100 kHz–100 MHz); ±8% full scale (700 MHz–1 GHz)
• DC Current Ranges: 1 mA to 10 A full scale (9 ranges)
• Current Accuracy: ±3% full scale ±0.15 mA (0°C to 55°C, calibrated)
• Front Panel Output: Variable linear; 1 V calibrated setting at full scale
• Recorder Output: 0 to 1.2 mA into 1000 Ω at full scale
• Low-Frequency Current Limit: DC to 400 Hz (3 dB point)
• Power Input: 115 or 230 V ±10%, 48–440 Hz; 71 W consumption
• Operating Temperature: 0°C to 55°C
• Dimensions: 292 mm H × 191 mm W × 368 mm D
• Net Weight: 8.6 kg

– Key Features

• Sampling technique extends bandwidth to 1.2 GHz with microvolt sensitivity
• Clip-on transducer for DC current measurement with galvanic isolation
• Eight voltage ranges and nine current ranges for flexible signal capture
• Proportional DC recorder output for data logging and strip-chart recording
• Dual-function capability: RF voltmeter and DC current monitor

– Typical Applications

• Receiver and amplifier characterization
• Coaxial transmission line measurements
• Magnetic field monitoring (with 3529A magnetometer probe)

– Compatibility & Integration

The 3406A accepts the HP 3529A Magnetometer Probe for magnetic field measurement (1 mG to 10 G full scale, DC to 80 Hz). Proportional DC recorder output allows integration with external strip-chart recorders or data acquisition systems.

Note: This product is discontinued.