electrodes.
The
cent
re
electrode
is
used
for
excitation;
because
it
is
encircled
by
the
ground
electrode,
the
path
for
a
ground
loop
through
the
soil
is
greatly
reduced.
Moisture
blocks
that
consist
of
two
parallel
plate
electrodes
are
particularly
susceptible
to
ground
loop
problems.
Similar
considerations
apply
to
the
geometry
of
the
electrodes
in
water
conductivity
sensors.
The
ground
electrode
of
the
conductivity
or
soil
moisture
probe
and
the
datalogger
earth
ground
form
a
galvanic
cell,
with
the
water/soil
solution
acting
as
the
electrolyte.
If
current
is
allowed
to
flow,
the
resulting
oxidation
or
reduction
will
soon
damage
the
electrode,
just
as
if
dc
excitation
was
used
to
make
the
measurement.
Campbell
Scientific
resistive
soil
probes
and
conductivity
probes
are
built
with
series
capacitors
to
block
this
dc
current.
In
addition
to
preventing
sensor
deterioration,
the
capacitors
block
any
dc
component
from
affecting
the
measurement.
See
also
10).
9.8
Field
calibration
Calibration
increases
accuracy
of
a
measurement
device
by
adjusting
its
output,
or
the
measurement
of
its
output,
to
match
independently
verified
quantities.
Adjusting
sensor
output
directly
is
preferred,
but
not
always
possible
or
practical.
By
adding
the
FieldCal()
or
FieldCalStrain()
instruction
to
a
CRBasic
program,
measurements
of
a
linear
sensor
can
be
adjusted
by
modifying
the
programmed
multiplier
and
offset
applied
to
the
measurement,
without
modifying
or
recompiling
the
CRBasic
program.
For
more
information,
see
the
CRBasic
help.
9.9
File
system
error
codes
Errors
can
occur
when
attempting
to
access
files
on
any
of
the
available
drives.
All
occurrences
are
rare,
but
they
are
most
likely
to
occur
when
using
optional
memory
cards.
Often,
formatting
the
drive
will
resolve
the
error.
The
errors
display
in
the
File
Control
messages
box
or
in
the
CardStatus
field
of
the
Status
table.
See
for
more
information.
1
Invalid
format
2
Device
capabilities
error
3
Unable
to
allocate
memory
for
file
operation
4
Max
number
of
available
files
exceeded
5
No
file
entry
exists
in
directory
6
Disk
change
occurred
7
Part
of
the
path
(subdirectory)
was
not
found
8
File
at
EOF
9
Bad
cluster
encountered
10
No
file
buffer
available
9. Tips and troubleshooting
122
Summary of Contents for CR1000X
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