Improved offshore calibration with Cropico decade boxes

The RBB series features a re-engineered lightweight case designed for high impact resistance and protection, and offers 0.05% calibration accuracy over a wide range of 0.001Ω to 11MΩ.

Five and six decade versions are available, which use Cropico maintenance free switches with gold plated contacts to ensure a low contact resistance and negligible thermal emf. The boxes give long-term stability of ±3ppm per year and similarly have a low temperature co-efficient of ±3ppm/°C to 85°C.

Units come in special models ideal for temperature and insulation resistance simulation.

Some models employ the Waidner Wolf technique to eliminate switch contact resistance errors and, with resolution as low as 0.0001Ω (0.0025°C), these are particularly suited to PT100 simulation. Another option is in-house test figures.