Theory
of
Operation
TRUE
RMS
AC
(OPTION
-09)
which feedback is used to perform an equivalent
analog
output is further filtered
by
a three-pole post-filter com-
computation.
prised
of
U809B
and associated resistors and capacitors.
This output is then switched into the Track/Hold Amplifier
The
filter averages the divider output signal. This filter
of the dc front end via
U302
pins
15
and
14.
The
consists of
U809A,
C813,
R815,
and the internal
25
kQ
TracMHold Amplifier is set up for unity gain on alL ac
.
-
resistor
and
op amp between pins
8
and
9
of
U802.
The
ranges.
v...
I
I
.. 2
-
IN
v,,z
FILTER
I
Figure
5-18.
True
RMS
AC-to-DC
Converter
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