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41
1.4.4.
Analog
section (multifunction
measurements)
1.4.4.
1.
R.M.S. convertor
In
the R.M.S. convertor the
difference
in
voltage
between
the
Vin2 and
Vini
is
converted
into current
in a
dual V-l convertor.
The
current
is
determined
by
Y_il!_and the
state
of the
RNGA
signal,
(where
R
is
either
R305
or
R
R306
+
R307).
This
relay
signal
from D1 908
selects
the input
sensitivity
of the R.M.S. convertor.
The
current
in
the
a.c.
to
d.c.
convertor
is
rectified
and
then converted
into
a
current again
by
the R.M.S.
section.
This current
is
proportional to the
r.m.s.
value of the input
signal
V.
Capacitor
C302
is
the
integrating
capacitor for the
R.M.S.
section.
Capacitors
C303
and
C304
provide the
automatic
zero
(AZ) compensation
for
the R.M.S. convertor.
The output
of the R.M.S. convertor
is
converted
into a voltage
by
resistor
network
R309-R312. The
output
voltage
can be
adjusted
by
R310
and
is
filtered
by R314/C306.
It is
supplied
via
relay
contact
K301
to the
active
filter.
RMS CONVERTOR
INPUT
R.M.S.
CONVERTOR
Fig.
29.
R.M.S. convertor
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