17
Figure
1.
An
NIST
‐
traceable
RTD
thermometer
(accuracy
±0.03
°C
from
‐
99.9
°C
to
+99.9
°C)
was
inserted
in
the
body
of
the
cuvette
holder
and
the
temperature
readings
(y
axis)
compared
to
the
value
set
by
the
TC
1
temperature
controller
(x
axis).
Data
points
shown
as
red
squares
are
results
were
obtained
with
the
temperature
decreasing;
the
blue
diamonds
indicate
results
obtained
with
the
temperature
decreasing.
Temperature
Reproducibility:
better
than
±
0.15
°C
over
the
range
of
0
°C
to
80
°C
Temperature
reproducibility
is
a
measure
of
the
ability
of
the
temperature
to
return
to
an
original
value
(See
Figure
1.).
It
accounts
for
differences
depending
on
the
direction
of
temperature
change
and
differences
from
day
to
day.
Reproducibility
is
measured
using
a
NIST
‐
traceable
RTD
temperature
probe
inserted
in
the
metal
block
of
the
cuvette
holder.
Example
of
Temperature
Performance
Figure
2.
turret
6
cuvette
holder
temperature
and
sample
temperature
(red,
measured
with
a
thermistor
probe
connected
to
the
t
2)
as
the
target
temperature
setting
was
progressed
through
20.0
°C,
50.0
°C,
0.0
°C,
‐
15.0
°C,
80.0
°C
and
20.0
°C
degrees
.
time (min)
160
140
120
100
80
60
40
20
0
te
m
p
er
a
tur
e
(
°C
)
80
70
60
50
40
30
20
10
0
-10
