Introduction
PT12
Manual
7/20/2021
Page
5
of
48
INTRODUCTION
The
PT12
is
a
highly
precise
and
stable
platinum
resistance
thermometer
(PRT)
based
multi
‐
channel
temperature
measurement
system.
Using
a
custom
designed
high
precision
measurement
circuit
with
full
current
reversal
and
multiplexed
sampling,
the
PT12
provides
12
channels
of
low
uncertainty
temperature
data
for
validation
and
calibration.
Using
one
of
three
automatic
or
user
selectable
currents,
the
PT12
repeatedly
scans
all
12
channels.
Employing
a
full
reversal
current
source,
the
PT12
eliminates
polarity
sensitive
errors
normally
inherent
to
DC
measuring
techniques.
Accuracy
is
further
enhanced
by
referencing
all
measurements
to
a
series
of
high
accuracy,
temperature
stable
internal
reference
resistors.
The
integrated
firmware
allows
each
channel
to
be
individually
programmed
with
ITS
‐
90
or
Callendar
‐
Van
Dusen
(CVD)
coefficients
for
direct
conversion
of
resistance
measurements
to
temperature.
It
incorporates
a
full
color,
pinch
zoom
touch
screen
as
the
user
interface.
Although
not
required
for
operation,
the
PT12
may
also
be
connected
to
a
PC
over
an
RS
‐
232
or
USB
interface.
