THERMISTOR
R/T
CURVES
FOR VARYING ROOM TEMP. RESISTANCES
TEMPERATURE (DEGREES C)
Figure
A.l
Thermistor Resistance Versus Temperature
In
prnctlce ne have found that the constants
A,
B
and C for virtually all common thermistors lie within
a
narrow
range Consequently, we have defined the constants C1, C2, C3 as follows:
The constants C
1,
C2. And
C3
may all be expressed in the form n.nnn
simplifying
entry into the LDC-3700 Series
Laser D~ode Controller.
If
high
accuracy is not required, the Steinhart-Hart equation may
be
simplified to a first order polynomial:
In=
A'
+
B'
*
In
R
Equation
2
Th~s equation is easier to solve and often provides adequate results. Table
A.
1
also shows that the use of Equation
2
introduces temperature errors of less than 0.5OC over the range -20 C to 50°C. Once the constants
A'
and
B'
are
dcterm~ned.
the
LDC-3700 Series Laser Diode Controller is programmed with the following values of C1, C2 and
C
3
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