The Agilent/Keysight 427A is a solid-state analog multimeter designed for DC voltage, AC voltage, resistance, and decibel measurements across laboratory and field environments. Built on discrete component circuitry with double-sided PCBs, the 427A delivers reliable performance through a mirrored analog meter display and offers flexible power options for both benchtop and portable applications.
– Technical Specifications
DC Voltage
• Ranges: 1 mV to 1000 V
• Accuracy: ±2% of full scale (0°C to 50°C)
• Input Resistance: 10 MΩ on all ranges
• Overload Protection: 1200 Vdc
AC Voltage
• Ranges: 10 mV to 300 Vrms (10 ranges)
• Frequency Range: 10 Hz to 1 MHz
• Input Impedance: 10 MΩ shunted by 40 pF (10 mV–1 V ranges); 20 pF (3 V–300 V ranges)
• Response: Average responding, calibrated in Vrms for sine wave input
• AC Rejection: Superimposed peak AC ≥60 Hz at 100× full scale causes <1% reading error
Resistance
• Ranges: 0.2 Ω to 500 MΩ
Additional Capability
• Decibel (dB) measurement mode
– Key Features
• Mirrored analog meter for reduced parallax error
• Dual power architecture: 115 V or 230 V AC mains (IEC connector) or internal 22.5 V dry cell battery (Eveready 763, RCA VS102)
• 1/3 rack width, 4U height—compact benchtop footprint
• Isolated 5-way binding post connector, independent of chassis ground
• Carrying handle for field deployment
• 10 MΩ input impedance provides high input resistance across voltage ranges
– Typical Applications
• Laboratory measurements and general troubleshooting
• Field service and component diagnostics
• Manufacturing quality assurance
• Research and development verification
– Compatibility & Integration
The 427A integrates into standard lab setups via isolated binding posts and accepts universal AC line power. Battery operation eliminates AC dependency for portable measurement tasks, making it suitable for both fixed installations and mobile field use.
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