The Fluke 742A-1 is a precision 1 Ω resistance standard engineered for high-accuracy calibration and verification in laboratory and field environments. This metrology-grade artifact delivers traceable, stable resistance values with no requirement for environmental controls such as oil or air baths, enabling on-site calibration work without infrastructure constraints.
Technical Specifications
Resistance & Accuracy
• Nominal resistance: 1 Ω
• Initial trim accuracy: ±2 ppm of nominal
• Best 1-year specification: ±4 ppm
• Temperature deviation (18°C to 28°C): 3.0 ppm maximum from 23°C reference
Stability & Thermal Performance
• Six-month stability: ±2.5 ppm
• One-year stability: ±4 ppm
• Retrace error (hysteresis): typically <2 ppm after 0°C to 40°C thermal cycling; negligible shift for 18°C–23°C–28°C cycles
• Operating temperature range: 18°C to 28°C
• Storage temperature range: 0°C to 40°C
• Temperature coefficients (alpha and beta) referenced to 23°C; on-board label enables temperature correction
Electrical Ratings
• Maximum voltage: 0.5 V
• Maximum current: 500 mA
• Four-wire (Kelvin) configuration supported via dedicated binding posts for low-resistance measurement
Connections & Interfaces
• Current HI/LO binding posts
• Sense HI/LO binding posts
• Chassis ground binding post
• Five-way low-thermal binding posts
Physical Specifications
• Dimensions: 86 mm H × 105 mm W × 127 mm D
• Weight: 1.5 to 2 lbs (0.68 to 0.91 kg)
• Construction: small and rugged form factor
– Key Features
• No special environmental conditioning required
• Fluke Primary Standards Lab calibration with full traceability documentation
• Rear panel label with measured value and temperature coefficients for field reference
• Report of Calibration included with each unit
– Typical Applications
• Artifact calibration of precision calibrators and resistance bridges
• Traceable resistance verification in accredited laboratories
• On-site calibration and field standards work
– Compatibility & Integration
Ideally suited for artifact calibration of Fluke 5700A and 5720A Calibrators.
