The Agilent/Keysight 432A is an analog RF power meter designed for precise measurement of RF and microwave power across seven selectable ranges. It delivers ±1% full-scale accuracy from 10 µW to 10 mW and operates across frequencies from 10 MHz to 18 GHz depending on thermistor mount selection. The instrument features a taut-band meter with computer-calibrated, mirror-backed scales and includes a 13-position calibration factor switch to normalize readings for specific sensor characteristics. A recorder output provides 1.000 V at full-scale deflection with ±0.5% accuracy into 1000 Ω impedance via BNC connector. The 432A supports DC substitution for independent power meter calibration and minimizes thermoelectric errors on sensitive measurement ranges. Operating temperature range is 0°C to +55°C with power requirements of 115 or 230 VAC ±10%, 48 to 440 Hz, at 13 VA maximum. An optional rechargeable nickel-cadmium battery (Option 01) extends operation to 20 hours continuous use with automatic recharge capability. This legacy instrument maintains broad compatibility with original thermistor sensor families while the Keysight N432A provides modernized digital alternatives.
Technical Specifications
• Power measurement range: 7 ranges, 10 µW to 10 mW (-20 dBm to +10 dBm) full scale
• Accuracy: ±1% of full scale (0°C to +55°C); enhanced ±0.2%, ±0.5 µW available via thermistor bridge voltage output
• Frequency range: 10 MHz to 10 GHz (HP 478A mount); 10 MHz to 18 GHz (HP 8478B mount)
• Calibration factor control: 13-position switch for sensor normalization
• Meter movement: Taut-band suspension with individually computer-calibrated, mirror-backed scales
• Recorder output: 1.000 V = full scale into open circuit; ±0.5% accuracy; 1000 Ω output impedance (BNC connector)
• DC substitution: Supported for calibration and verification
• Operating temperature: 0°C to +55°C
• Storage temperature: -20°C to +60°C
• Humidity: Up to 95% RH at 40°C (non-condensing)
• Power input: 115 or 230 VAC ±10%, 48 to 440 Hz, 13 VA max
• Weight: 6.5 lb (3 kg) standard; 9.25 lb (4.2 kg) with battery pack
• Optional battery: Rechargeable nickel-cadmium, 20 hours continuous operation
– Key Features
• Thermoelectric error minimization on sensitive ranges
• Dual thermistor mount compatibility extends frequency coverage
• Independent meter calibration via DC substitution
• EMC compliance: EN55011:1991 (Group 1, Class A) and EN50082-1
– Typical Applications
• RF and microwave power measurement and verification
• Communication system calibration and testing
• Radar equipment characterization
• High-frequency electronic device testing
– Compatibility & Integration
• Agilent HP 478A Coaxial Thermistor Mount: 10 MHz to 10 GHz
• Agilent HP 8478B Coaxial Thermistor Mount: 10 MHz to 18 GHz
• Successor instrument: Keysight N432A (enhanced digital capabilities, sensor compatibility maintained)
