
21-1
Current-measuring devices are selected for the following:
• Precision
•
Sta
bility
• Frequency response, including direct current (dc)
• Galvanic isolation
• Presentation of the data
•
E
ect
o
n
m
easured
c
ircuit
In this chapter, the most common current sensors will be introduced in detail. Some less common
sensors will follow aer denitions and a bit of magnetic theory, which can be skipped. Any mag-
netic
e
ld
se
nsor
ca
n
be us
ed
as a cu
rrent
se
nsor,
an
d
th
ere
ar
e
so
me
ex
otic
ex
amples
su
ch
as qu
antum
eects in low-temperature superconductors used to measure currents in neurons within the brain. is
discussion will be limited to measurement ...