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TECMount
User’s Manual
Using the Thermistor on Standard Versions
The standard version of the
286
LaserMount
is equipped with a 10k
Ω
negative
temperature coefficient (NTC) thermistor, specifically, the BetaTHERM 10K3A1.
A thermistor works by translating temperature into resistance, with resistance
decreasing as temperature increases (hence the ‘negative coefficient’).
Below is the response curve of the thermistor:
Resistance vs. Temperature Graph
As can be seen be the graph, the resistance of the thermistor drops very quickly.
In the typical control range (0°C to 40°C), typical 10K thermistors offer good
sensitivity to changes in temperature, and this is the range in which most 10K
thermistors are typically used. 10K thermistors can be used at much higher
temperatures, but will suffer poorer temperature stability performance because
of the lower sensitivity.
All Arroyo temperature controllers support operation using a 10
μ
A or 100
μ
A
thermistor bias, which limits the upper control range to 450k
Ω
or
45k
Ω
,
respectively. To minimize noise and maximize stability, you should select
highest current while still allowing you full operation across your required
temperature range. The typical setting is 100
μ
A, but your application will
determine the actual needs.
0
10000
20000
30000
40000
50000
-10.00
10.00
30.00
50.00
70.00
90.00
110.00
Resistance (
Ω
)
Temperature (°C)
