Title :
Micropotentiometers Providing Low Output Impedance for Millivolt AC–DC Transfer
Author :
Klonz, Manfred ; Funck, Torsten
Author_Institution :
Phys.-Technische Bundesanstalt, Braunschweig
fDate :
4/1/2007 12:00:00 AM
Abstract :
Millivolt ac-dc transfer devices and ac measuring instruments are calibrated with new micropotentiometers (mupots) with low output impedance. Newly designed output resistors of 0.2 and 0.1 Omega lead to reduced load corrections for 150 kOmega input impedance amplifiers of only a few muV/V. The higher current required is measured at 1 MHz with a 500 mA thermal current converter. At 1 MHz, expanded uncertainties (k = 2) less than 40 muV/V are achieved from 100 down to 10 mV
Keywords :
AC-DC power convertors; electric current measurement; electrometers; potentiometers; transfer standards; voltage measurement; 1 MHz; 150 kohm; 500 mA; ac measuring instruments; impedance amplifiers; low output impedance; micropotentiometers; millivolt ac-dc transfer devices; thermal current converter; Current measurement; Frequency; Impedance measurement; Instruments; Resistors; Testing; Thermal loading; Thermal resistance; Uncertainty; Voltage; AC–DC transfer; load correction; low output impedance; micropotentiometers $(muhbox{pots})$; planar multijunction thermal converter (PMJTC);
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2007.890810
