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3\15 Dawn's Early Light - March 2003
Part 2 of 2

The ranges and sensitivity of the magnetometer are tailored to the 
expected environments to be found at Vesta and Ceres as well as the 
magnetic environment of the spacecraft. We have conservatively chosen 
a ± 1000 nT range for the magnetometer, sampled at 20 Hz. The data are 
digitized to 16 bits providing ± 0.015 nT digitization. The UCLA 
magnetometer derives from a long line of missions including OGO5 
(1968); ISEE 1 and 2 (1977), Pioneer Venus (1978); Galileo (1989); 
Polar (1996) and ST5 (in fabrication).  The main electronics unit, a 
sensor triad, and a block diagram are shown in Figure 1. The main 
electronics and the sensors are completely redundant, use a single 
range and data rate and operate continuously. A third new technology 
magnetometer, with a design based on the sigma delta modulator, adds 
further redundancy. This overall instrument design was chosen because 
of its low-noise level, simplicity, low cost and its high inheritance 
from recent missions.

http://www-ssc.igpp.ucla.edu/dawn/newsletter/html/20030314/

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