Title :
Low noise programmable current source for the NIST-3 and NIST-4 watt balance
Author :
Haddad, D. ; Waltrip, B. ; Steiner, R.L.
Author_Institution :
Nat. Inst. of Stand. & Technol., Gaithersburg, MD, USA
Abstract :
We give a brief description of a low noise, high resolution programmable current source that was designed for the NIST-3 watt balance to determine the Planck constant h and will be used for the NIST-4 watt balance. The current source is used to control the induction coil position in the magnetic field. It features bipolar operation to ±20 mA, high resistance isolation to ground, and low power consumption.
Keywords :
balances; coils; constant current sources; constants; digital-analogue conversion; measurement standards; programmable logic devices; NIST-3 watt balance; NIST-4 watt balance; Planck constant; induction coil; low noise programmable current source; magnetic field; Coils; Noise; Optical fiber amplifiers; Optical fiber cables; Optical receivers; CPLD; GPIB to fiber optic interface; Planck constant; programmable current source; watt balance;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM), 2012 Conference on
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4673-0439-9
DOI :
10.1109/CPEM.2012.6250939
