Fluke 742A-10M Resistance Standard

The Fluke 742A-10M is a 10 MΩ precision resistance standard engineered for high-accuracy calibration and metrology in laboratory environments. This hermetically-sealed wirewound standard delivers initial accuracy of ±2 ppm with exceptional long-term stability and minimal temperature dependence, enabling calibration uncertainty as low as ±0.2 ppm. Its compact, portable design and low-thermal-emf binding posts eliminate the need for temperature baths, supporting both laboratory and on-site calibration workflows.

Technical Specifications Nominal Resistance: 10 MΩ Accuracy & Stability

Initial trimming: ±2 ppm of nominal

6-month stability: ±2.5 ppm

1-year stability: ±4 ppm typical

Calibration uncertainty: as low as ±0.2 ppm Temperature Performance

Operating range: 18°C to 28°C (degradation <2 ppm)

Storage range: 0°C to 40°C

Temperature coefficient: near zero at 23°C (unit-specific α and β values labeled)

Retrace error (0°C to 40°C cycling): <2 ppm typical

On-site correction using supplied calibration table: 0.5°C increments reduce uncertainty to near zero Electrical Limits

Maximum voltage: 200 V

Maximum current: 20 µA

Key Features

Arrays of hermetically-sealed wirewound precision resistors with no adjustable elements

Low-thermal-emf binding posts and materials reduce temperature-induced errors

Two-terminal output configuration

Dimensions: 8.6 cm H × 10.5 cm W × 12.7 cm L (including binding posts)

Weight: 0.68–0.91 kg

Rugged enclosure rated for transport and field deployment

Typical Applications

Electrical standards laboratory calibration

Primary and secondary resistance standard verification

High-resistance measurement traceability

Temperature-compensated on-site calibration

Compatibility & Integration Optional transit case accommodates two standards. Low Thermal Copper EMF Plug-In Cables with Banana Connectors (e.g., Fluke 5440A-7002) are recommended for optimal measurement performance.