V
oltage
Sense
Amplier
and
Process
Amplier
Sections
These
sections
measure
the
voltage
across
the
DUT
and
processes
the
outputs
from
the
voltage
sense
amplier
and
the
current
sense
amplier
.
Figure
4-6
shows
this
section's
block
diagram.
Figure
4-6.
V
oltage
Sense
Amp
.
and
Process
Amp
.
Block
Diagram
The
voltage
sense
amplier
,
which
is
a
dierential
amplier
,
measures
the
vector
voltage
across
the
DUT
via
the
High-P
otential
(H
POT
)
and
Low-P
otential
(L
POT
)
connectors
.
The
output
of
the
voltage
sense
amplier
is
fed
back
to
the
signal
source
section
for
dry
circuit
measurement.
SW1
in
the
process
amplier
selects
the
inputs
from
the
voltage
sense
amplier
and
current
sense
amplier
to
be
processed.
The
selected
signal
is
attenuated
according
to
the
range
resistor
setting.
The
lter
passes
the
fundamental
signal
(1
kHz
)
in
order
to
purify
the
signal
for
accurate
and
stable
measurement.
The
ltered
signal
is
converted
into
digital
data
to
be
processed
by
the
digital
section.
4-8
T
roubleshooting
