Resistance Calibration

Our DC resistance measurement is by Direct Current Comparison (DCC) using the state-of-the-art Guildline 6625 Resistance Measurement System (incorporating a Guildline 6622A Bridge) from 1 mΩ to 1 GΩ achieving UKAS uncertainties from 0.07 ppm at currents up to 150 A utilising the Guildline 6623A Range Extender. AC resistance using ratio transformer bridges from 40 Hz and 1592 Hz from 0.1 to 10 kohm result in uncertainties from 6 ppm to 0.030%. Low Value Resistors Absolute Calibration's UKAS Best Measurement Capability is for 4-terminal resistors suitable for oil immersion at 20°C. The uncertainties may be increased for other types of resistors. Specific Value Best Measurement Capability 100μΩ 4.0 ppm 1 mΩ 0.30 ppm 10 mΩ 0.30 ppm 100 mΩ 0.24 ppm 1 Ω 0.090 ppm 10 Ω 0.080 ppm 100 Ω 0.070 ppm 1 kΩ 0.080 ppm 10 kΩ 0.22 ppm 100 kΩ 0.22 ppm 1 MΩ 0.61 ppm 10 MΩ 1.8 ppm 100 MΩ 4.5 ppm 1 GΩ 5.3 ppm High Value Resistors Values from 1 GΩ to 2 TΩ are measured using the Guildline 6520 Teraohmmeter with uncertainties from 0.021% to 0.10%. For uncertainites on other resistance values, please take the link below to view our full UKAS Calibration schedule.