MICROPOTENTIOMETERS WITH NEW DISC RESISTORS AND PLANAR MULTIJUNCTION THERMAL CONVERTERS CALIBRATING HIGH INPUT IMPEDANCE mV-AMPLIFIER

摘要

In the new design of micropotentiometers ((mu)pots) planar multijunction thermal converters (PMJTCs) are used together with a new design of the housing and new disc resistors. Only two (mu)pots are needed for the step-down chain from 100 mV to 2 mV. A new mV-amplifier in conjunction with a PMJTC is designed to measure the output voltage of the (mu)pots. Its high input impedance of >1 M(OMEGA) || <10 pF avoids the loading of the output resistor of the (mu)pots. Uncertainties in the mV-ac-dc transfer are reduced considerably.