Chapter 4 Temperature Controller Module Operation 67
When an AD590 sensor is used, another two-point conversion equation is used to
determine the temperature. Its reference current is sensed across a resister, and this
voltage is measured. The ITE current is also measured.
4.6.9.2 R Mode
In constant R mode, the TEC is driven to the set point resistance, voltage, or current.
This resistance, voltage, or current is measured and converted to a temperature. The
ITE current is also measured.
4.6.9.3 ITE Mode
In constant ITE mode, the TEC is driven with a constant current, at the ITE
set point value. The ITE current is sensed across a resistor and the voltage is
converted to ITE current.
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