Fluke 732B Direct Voltage Standard

The Fluke 732B Direct Voltage Standard is a portable, high-precision DC voltage reference instrument designed for calibration laboratories and metrology applications requiring stable, traceable voltage standards. It replaces saturated standard cells with solid-state technology, providing two independently selectable outputs (1.018 V DC and 10 V DC) with exceptional long-term stability and minimal drift. The 732B is engineered for transferring calibration values from national standards and advanced systems like Josephson Arrays while maintaining institutional voltage references in demanding measurement environments.

Technical Specifications

• 1.018 V DC: ±0.8 ppm (30-day), drift ~1 ppm/month


• 10 V DC: ±0.3 ppm (30-day), ±2.0 ppm (1-year), drift ~0.8 ppm/month


• Output current drive: 12 mA per output


• Output noise: 130 hours Environmental & Physical


• Operating temperature: 15°C to 35°C


• Non-operating temperature: −51°C to 71°C


• Operating humidity: <95% RH to 30°C; <75% RH to 35°C (non-condensing)


• Operating altitude: <3049 m (10,000 ft)


• Vibration: MIL-T-28800 Type III, Class 5, Style E


• Dimensions: 13.4 cm H × 9.8 cm W × 40.6 cm D


• Weight: 5.91 kg (13 lbs)

Key Features

• Dual voltage outputs for flexible reference configurations


• Compact, light design rated for portable field and laboratory deployment


• Trickle-charge capability maintains battery health during AC operation


• Sub-microvolt output noise

Typical Applications

• Metrology lab voltage reference standards


• Calibration value transfer from national laboratories


• Institutional standards maintenance


• Portable voltage calibration work