Fluke 5790B – AC Measurement Standard

The Fluke 5790B AC Measurement Standard is a precision calibration instrument that combines thermal transfer standard accuracy with digital multimeter usability. It performs absolute AC voltage and current measurements alongside AC/DC transfer mode operations for demanding metrology and calibration laboratory applications. A 6.5-inch color touchscreen displays measurement results, automated AC/DC or AC/AC difference calculations, and waveform analysis in real time.

Technical Specifications

• Range: 600 µV to 1000 V


• Frequency: 10 Hz to 1 MHz (standard); 10 Hz to 30 MHz or 10 Hz to 50 MHz with wideband options


• Absolute uncertainty: ± 24 ppm (one year, 23 °C ± 5 °C)


• Wideband ranges: 2.2 mV to 7 V (Option /3); dedicated 50 MHz, 225 mV, 50 ohm input for RF power meter reference outputs AC Current Measurement


• Direct, absolute, or relative current measurements with Fluke A40B Current Shunts


• Shunt memory: Up to 150 shunts with serial numbers, calibration constants, and dates


• Simultaneous voltage, current, and shunt information display Measurement Modes


• Measurement mode: 8-digit resolution AC/DC voltmeter with internal DC reference


• Transfer mode: AC/DC or external DC reference comparison; ± 24 ppm uncertainty


• Simultaneous mA measurement and sourcing/simulation


• Frequency measurement to 20 kHz


• Peak-to-peak waveform and statistics functions


• Waveform calculations for sine, square, triangle, and truncated waveforms


• 5790A emulation mode for legacy system replacement

Key Features

• 6.5-inch color touchscreen with real-time waveform display


• Operating temperature range: 0 °C to 50 °C


• Power: 95 VA nominal (120 VA with wideband option)


• Line supply: 50/60 Hz; 100–120 V or 220–240 V AC


• Dimensions: 43.2 cm (W) × 63 cm (D) × 17.8 cm (H) with rackmount kit


• Weight: 24 kg (24.5 kg with wideband option)

Typical Applications Calibration and verification of AC voltage and current measurement devices in metrology laboratories, transfer standard operations, AC/DC difference measurements, and RF power meter reference output validation.