Fluke 742A-100 Resistance Standard

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

• 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.