Title :
Precision automated capacitance bridges for the low frequency range at the PTB
Author :
Hanke, R. ; Melcher, J. ; Muciek, A. ; Koster, R.
Author_Institution :
Physikalisch Tech. Bundesanstalt, Braunschweig, Germany
fDate :
June 27 1994-July 1 1994
Abstract :
Two computer-controlled capacitance bridges for different fields of application have been developed at the PTB. The first one, the universal bridge, works in the capacitance range of less than 1 pF up to 1 /spl mu/F and in a frequency range up to 1 kHz, The total calculated relative uncertainties (2/spl sigma/) are in the order of 5/spl middot/10/sup -6/ and 20/spl middot/10/sup -6/. The second one, the fixed ratio bridge, calibrates primary standards with capacitance values from 1 pF to 1 nF in 1:1, 1:2, 1:5 or 1:10 steps at frequencies from 100 Hz to 10 kHz. The relative uncertainty of one 1:10 step at a frequency of 1592 Hz is estimated to be 3/spl middot/10/sup -8/ (1/spl sigma/).<>
Keywords :
bridge instruments; calibration; capacitance measurement; computerised instrumentation; measurement standards; 1 kHz; 1 pF to 1 muF; 1 pF to 1 nF; 100 Hz to 10 kHz; 1592 Hz; PTB; automated capacitance bridge; computer-controlled capacitance bridges; fixed ratio bridge; low frequency range; primary standards; relative uncertainties; relative uncertainty; universal bridge; Bridge circuits; Calibration; Capacitance; Capacitors; Error correction; Frequency estimation; Laboratories; Quality control; Switches; Uncertainty;
Conference_Titel :
Precision Electromagnetic Measurements, 1994. Digest., 1994 Conference on
Conference_Location :
Boulder, CO, USA
Print_ISBN :
0-7803-1984-2
DOI :
10.1109/CPEM.1994.333188
