ILX Lightwave LDT-5525 User Manual page 61

1.6
0.8
ABSOLUTE
0
ERROR
(DEGREES C)
-0.8
-1.6
If a maximum absolute error of 0.8 °C is tolerable (over the entire temperature range), the one point calibration of C1
should be used (see page C-5). If C1 is calibrated at 25 °C, and the intended operating range is 0 to 50 °C, a maximum
error of about +0.2 °C may be expected over that operating range. If a greater accuracy is desired, the two point
method of determining C1 and C2 should used (see page C-6). Note however, the absolute error curve is non-linear,
therefore the constant C2 will vary over different temperature ranges.
LM335 Sensor
The LM335 is a linear thermal sensor which acts as a constant voltage source. It produces a voltage, v, which is
directly proportional to absolute temperature, over its useful range (-40°C to +100°C). This nominal value can be
expressed as:
-where v is the nominal voltage produced by the LM335 and K is in Kelvin.
-55
DEGREES C
v = 10mV / K
150
Figure C.1 AD590 Nonlinearity
C-3