0.8
--
..--.............
........--.--..--........
.
ABSOLUTE
ERROR
(DEGREES
C)
-1.6
I
I
-55
150
DEGREES
C
Figure
C.l
AD590
Nonlinearity
If
a
maximum absolute error of
0.8
"C is tolerable (over the entire temperature range), the one point calibration of
C
I
should be used.
If
C 1 is calibrated at
25
OC, and the intended operating range is 0 to
50
"C, a maximum error of
about
51.2
"C
may be espected over that operating range.
If
a greater accuracy is desired, the two point method of
determining
C1
and C2 should used. Note however, the absolute error curve is non-linear, therefore the constant
C2
will vary over different temperature ranges.
Lh1335
Sensor
The
Lhliij
IS
a
l~near thermal sensor which acts as a constant voltage source. It produces a voltage, v, which is
d~rectl! proport~onal to absolute temperature, over its useful range (-40°C to +lOO°C). This nominal value can
be
c\presscd
as
-11
here
\.
IS
the nominal voltage produced
by
the
LM335
and
K
is
in Kel~in.
The LDC-3700 Series Laser Diode Controller uses v to determine the nominal temperature,
T,,
by the formula:
-I\
here
T,,
is
in
"C
The temperature, T,, which is displayed by the LDC-3700 Series Laser Diode Controller, is first calibrated as
follo\\~s~
-\\here
C
1
and
C2
are the constants stored by the user in the LDC-3700 Series Laser Diode Controller for
rile
Lhl335
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