Page 38 · 6300 Series ComboSource User’s Manual
hidden from the menu, and the current limit is adjusted to the mount’s rated limit
to prevent damage to the mount’s Peltier cooler.
Adjusting the Mount setting to User Defined removes all software limits, allowing
unrestricted operation of the ComboSource.
Working With Thermistors
The ComboSource is designed to work with negative temperature coefficient
(NTC) thermistors, such as the BetaTHERM 10K3A1 thermistor used in the
LaserMounts. A thermistor works by translating temperature into resistance,
with resistance decreasing as temperature increases (hence the ‘negative
coefficient’).
Here is a typical response curve of a thermistor:
Typical 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. When evaluating the performance of a thermistor, it is
important to understand the resistance sensitivity of the thermistor at your
0
10000
20000
30000
40000
50000
-10.00 10.00 30.00 50.00 70.00 90.00 110.00
Resistance (Ω)
Temperature (°C)
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