Steinhart-Hart Thermistor Calculator
Steinhart-Hart Calculator: This allows users to input resistance and coefficients (A, B, C) to calculate the temperature using the Steinhart-Hart equation. If you have a random thermistor (like a random Engine Coolant Temperature (ECT) sensor or a random Intake Air Temperature (IAT) sensor), you can calculate the coefficients for the Steinhart-Hart Equation, which provides excellent curve fitting, based on three meaurments: low temperature, mid-range temperature and high temperature.
NTC Thermistor Voltage Divider Temperature Calculator
Voltage Divider Calculator: This section allows users to input the input voltage and the resistances of the fixed resistor and the thermistor to calculate the output voltage of the divider. A thermistor is a temperature-sensitive electronic device that changes its resistance in response to temperature variations. The name “thermistor” comes from the words “thermal resistor.” In temperature measurement and control applications, Negative Temperature Coefficient (NTC) thermistors are commonly used, indicated by the “-t°” in the circuit symbol. These components are particularly useful in microcontroller-based projects. To accurately measure temperature with a thermistor, a potential divider (PD) network is often the most effective circuit configuration.
Steinhart-Hart Temperature Calculation
Thermistor resistance is related to temperature in degrees Kelvin by the following formula:
1/T= A + B*ln(R/Rt) + C*ln(R/Rt)2 + D*ln(R/Rt)3
In the standard Steinhart-Hart equation the C parameter is set to zero. However, some manufacturers use all 4 coefficients. In the calculator below, you can specify whether to use this term or not, by just setting it to zero.
Voltage Divider Output
A voltage divider is a passive linear circuit that produces an output voltage (Vout) that is a fraction of its input voltage (V1). Voltage dividers are used to make signal level adjustments, for active device and amplifier bias, and for measuring voltages.
