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PCL-813 User's Manual
A/D Calibration
Because
the
PCL-813
supports
a
variety
of
A/D
input
ranges,
accurate
calibration
for
a
certain
A/D
range
may
result
in
a
small
offset
when
the
input
range
is
altered.
It
is
strongly
suggested
that
you
recalibrate
whenever
a
different
A/D
range
is
selected.
Calibration
Steps:
a.
Bipolar
Adjustment:
(JP100
located
at
“B”)
(1)
Short the A/D input of Channel 0 to AGND. Adjust VR1
until the reading of the A/D conversion flickers between
2047 and 2048.
(2)
Apply a voltage with a full-scale value corresponding to the
specific A/D input range to A/D Channel 0. Adjust VR2
until the reading of the A/D conversion flickers between
4094 and 4095.
b. Unipolar Adjustment: (JP100 located at “U”)
(1)
Short the A/D input of channel 0 to AGND. Adjust VRI
until the reading of the A/D conversion flickers between
0000 and 0001.
(2)
Apply a voltage with a full-scale value corresponding to the
specific A/D input range to A/D channel 0. Adjust VR4
until the reading of the A/D conversion flickers between
4094 and 4095.
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