CHAPTER 5 THEORY OF OPERATION
5-3
8)
v
It
c
=
where
v is in volts I is in amps t is in seconds and c is in farads. Substituting equation 7 for I
and
C
f
for
c gives:
9)
v
e
R C
t
i
i
f
=
Since the junction of
C
f
and
R
i
is at virtual ground, the voltage developed across
C
f
is equal to
the integrator output voltage
e
o
. This gives the transfer function for the integrator.
10)
e
e
R C
t
o
i
i
f
=
The integrator output voltage is therefore directly proportional to the time integral of the input
signal. If a search coil is connected to the input of the integrator and then experiences a
change in magnetic flux
∆∅
, the output of the integrator will be dependent upon the total flux
crossing the coil, and independent of the speed with which the coil is withdrawn.
Summary of Contents for 2130
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