The Fluke 5790A is a metrology-grade AC measurement standard engineered for high-precision calibration of AC voltage and current equipment in advanced calibration laboratories. It combines a true thermal converter with digital AC voltmeter operation, delivering absolute AC voltage measurements with uncertainties as low as ±24 ppm (1-year, 23°C ±5°C). The instrument operates in two modes: Measurement Mode, where it functions as an 8-digit AC voltmeter with an internal DC reference, and Transfer Mode, which compares against an external DC or AC reference source and automatically displays AC/DC or AC/AC differences without manual switching.
Technical Specifications
• AC Voltage Measurement: 700 µV to 1000 V; standard frequency range 10 Hz to 1 MHz; wideband option extends to 30 MHz; best 1-year accuracy ±24 ppm (standard) or ±0.35% (wideband); minimum transfer voltage 70 mV
• AC/DC Current Transfer: Compatible with Fluke A40 and A40A current shunts; up to 20 A maximum; frequency range 40 Hz to 10 kHz
• Measurement Resolution: 8-digit digital display on vacuum fluorescent screen
• Input Configuration: Two Type-N connectors, two five-way binding post sets; dedicated SHUNT binding posts for current shunt connection
• Remote Interfaces: RS-232C, IE connectivity
– Key Features
• Fluke Solid-State Thermal RMS Sensor (FTS) provides true RMS conversion with exceptional stability and fast settling
• Hermetically sealed thin-film resistor networks minimize AC measurement errors and temperature drift
• Fully automated operation with autoranging and manual range selection/locking
• Self-contained calibration with operator-guided prompts
• MET/CAL calibration software compatible
– Typical Applications
Calibration verification of Fluke calibrators, amplifiers, transfer standards, and AC voltmeters; primary AC voltage transfer in metrology environments requiring national/international standards traceability.
– Compatibility & Integration
The 5790A integrates with Fluke A40-series current shunts for AC/DC current measurement and operates with MET/CAL software platforms via RS-232C and IE interfaces.
