A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z  

Emmenegger, M.

Paper Title Page
THPP129 New Generation of AD-measurement Cards for High Accuracy Measurements 3664
 
  • St. Schnabel, M. Emmenegger, F. Jenni, H. Jäckel, R. Kuenzi
    PSI, Villigen
 
  Current transducers, together with the AD conversion of the measured current, are the key elements of high precision power supplies. The accuracy of commercially available current transducers is within the range of a few ppm. Any degradation of this precision by the succeeding stages must be kept as small as possible. Therefore, the accuracy of the AD conversion has to be at least in the same order of magnitude. The presented AD-measurement card improves the accuracy of the available, already calibrated precise ADCs by correcting the remaining errors. The necessary accuracy can only be achieved by measuring and correcting the miscellaneous errors of ADC and involved components, like voltage reference, antialiasing filter and input amplifier. From the measured deviation a correction look-up table is derived and later processed. Other implemented means for the improvement of the precision are the stabilization of the temperature, minimization of the electromagnetic influence by galvanic isolation, reduction of electrical noise and a fully differential signal path.