The Fluke 734C DC Reference Standard is a metrology-grade voltage reference system that houses four electrically and mechanically independent Fluke 732C standards in a single rack-width enclosure. Designed for primary and secondary standards laboratories, it maintains DC voltage references traceable to national standards and the Fluke Calibration 10 V Josephson Array. The modular architecture enables on-site intercomparisons to verify stability and reduce measurement uncertainty while allowing individual 732C units to be transported for remote calibration work.
Technical Specifications
Voltage Outputs
• 10 V DC
• 1 V DC
• 0.1 V DC
Stability (per year)
• Base models: ±2 µV/V at 10 V, ±3 µV/V at 1 V, ±9.8 µV/V at 0.1 V
• Select models: Two times more stable than base models at 10 V
Power Input
• AC line voltage via front panel (0.13 A typical at 120 V AC)
• External DC: 12 V to 15 V DC at ≥300 mA (rear-panel input)
• Internal battery: Minimum 72 hours operation at 23±5 °C with 0–0.1 mA output drain; up to 210 hours with optional external battery and charger
Output Protection
• All outputs short-circuit proof
• 10 V output protection: 50 mA continuous at ≤220 V DC; 25 mA continuous or 0.6 J short-duration at ≤1100 V DC
• Insulation resistance: >10,000 MΩ (chassis to any binding post or AC line), <1000 pF capacitance
Connectors
• Front-panel binding posts for outputs and internal guard access
• Chassis ground connections on front and rear panels
– Key Features
• Four independent 732C reference units in single enclosure with integrated AC power distribution
• Portable individual standards for field verification while primary reference remains lab-secure
• Extended battery operation supporting field deployment and portable metrology
• Short-circuit tolerant outputs with overvoltage protection to 1100 V DC
• High insulation integrity for low-noise measurement chains
– Typical Applications
• Primary and secondary voltage standard establishment and maintenance
• DC reference dissemination in calibration laboratories
• Multi-unit intercomparison for uncertainty assessment
• Field verification of voltage standards at remote sites
– Compatibility & Integration
The 734C enclosure accommodates up to four 732C DC Standards and 732C-7001 External Battery/Charger modules with unified AC power distribution.
