Sutron
Corporation
SDI
‐
TB
Users
Manual
Rev.
1.1
5/24/2018
pg.
5
The
SDI
‐
TB
measures
the
time
between
the
current
tip
and
the
previous
tip
and
uses
the
bucket
size
to
compute
the
equivalent
rainfall
in
inches/hour.
The
polynomial
is
then
used
to
convert
the
resultant
rainfall
in
inches/hour
to
rainfall
per
tip.
If
the
coefficients
have
not
been
configured,
the
bucket
size
is
used.
The
SDI
‐
TB
has
an
internal
Real
Time
Clock
(RTC)
that
is
used
to
keep
time
and
can
be
programmed
to
perform
daily
and
annual
rainfall
resets.
The
SDI
‐
TB
has
a
built
in
rechargeable
backup
power
source
that
is
used
to
power
the
module
for
upto
10
hours
of
uninterrupted
operation
in
case
SDI
‐
12
power
is
lost.
The
current
draw
will
be
higher
during
the
charging
phase
and
reduce
over
time,
till
the
backup
power
source
is
completely
charged.
0.009
0.0095
0.01
0.0105
0.011
0.0115
0.012
0.0125
0.013
0.0135
0
5
10
15
20
25
30
Inches/tip
Rain
(inches/hour)
