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.
