The Fluke 742A-100 is a precision 100 Ω resistance standard engineered for calibration and verification of resistance measuring instruments in metrology labs and production environments. Built from hermetically-sealed wirewound resistor arrays with no adjustable components, it delivers calibration uncertainty of ± 1.0 ppm at 23°C and six-month stability of ≤ 2.5 ppm. The unit requires no temperature-controlled air or oil baths and arrives with NIST-traceable calibration documentation including temperature characterization data in 0.5°C increments.
Technical Specifications
Resistance & Accuracy
• Nominal resistance: 100 Ω
• Initial trim: ± 2 ppm of nominal
• Calibration uncertainty (23°C): ± 1.0 ppm
• Six-month stability: ≤ 2.5 ppm
• One-year stability: ≤ 4 ppm
Temperature Performance
• Operating range: 18°C to 28°C
• Storage range: 0°C to 40°C
• Temperature coefficient: Near zero at 23°C
• Maximum deviation (18°C to 28°C): ≤ 3.0 ppm
• Retrace error (0°C to 40°C cycles): Typically < 2 ppm
Electrical Ratings
• Maximum current: 20 mA
• Maximum voltage: 2 V
Connectors
• Five-way tellurium-copper binding posts (current HI/LO, sense HI/LO, chassis ground)
• Low-thermal emf construction
Physical
• Dimensions: 8.6 cm H × 10.5 cm W × 12.7 cm D
• Weight: 0.68 kg to 0.91 kg
– Key Features
• No oil or air bath required
• Hermetically-sealed construction minimizes thermal and mechanical shock effects
• Temperature characterization table in 0.5°C increments supplied with calibration report
• Four-terminal configuration supports precision kelvin resistance measurement
• NIST-traceable calibration from Fluke Primary Standards Lab
– Typical Applications
• Resistance meter and multimeter calibration
• Data acquisition system validation
• Production test equipment traceability
• Metrology laboratory reference standards
• Temperature-corrected measurement verification
– Compatibility & Integration
Connects directly to four-terminal resistance measurement systems via standard binding posts. Temperature correction data provided on calibration certificate enables operation across 18°C to 28°C with minimal uncertainty.
