Calibration of resistances is a very important activity for industry laboratories and metrology laboratories. Primary metrology laboratories are estimated to carry out some 10.000 calibrations per year over all in the Community.
The value of the resistance in a.c. is influenced by the frequency and this results in increased causes of inaccuracy at high frequency.
The intercomparison involves resistors 0.1 ohm, 1 ohm, 100 ohm, 1 kohm, 10 kohm, 100 kohm and 1 Mohm with coaxial UHF connectors.
Measurements are to be done at frequencies ranging from 120 Hz to 10 kHz.
Resistors of nominal values 1 ohm, 10 ohm, 100 ohm, 1 kohm, 10 kohm, 100 kohm and 1 Mohm have been calibrated at 120 Hz, 400Hz, 15922 Hz and 10000 Hz. The uncertainties observed have been of the order of 1 ns in the time constant and of a few parts in 1E-6 in the time constant.
Funding SchemeCSC - Cost-sharing contracts
TW11 0LW Teddington