NTC Temperature Calculator

NTC Thermistor Equation:

\[ T = \frac{1}{\frac{1}{T_0} + \frac{1}{B} \times \ln\left(\frac{R}{R_0}\right)} \]

Reference Temperature (T₀):

B-Value (B):

Measured Resistance (R):

Reference Resistance (R₀):

Calculated Temperature:

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1. What is the NTC Thermistor Equation?

The NTC (Negative Temperature Coefficient) thermistor equation calculates temperature based on the resistance of a thermistor. It uses the Steinhart-Hart approximation to model the relationship between resistance and temperature in NTC thermistors.

2. How Does the Calculator Work?

The calculator uses the NTC thermistor equation:

\[ T = \frac{1}{\frac{1}{T_0} + \frac{1}{B} \times \ln\left(\frac{R}{R_0}\right)} \]

Where:

\( T \) — Calculated temperature (Kelvin)
\( T_0 \) — Reference temperature (usually 25°C = 298.15K)
\( B \) — B-value of the thermistor (material constant)
\( R \) — Measured resistance at temperature T
\( R_0 \) — Resistance at reference temperature T₀

Explanation: The equation models the exponential relationship between resistance and temperature in NTC thermistors.

3. Importance of NTC Thermistor Calculations

Details: Accurate temperature calculation from NTC thermistor resistance is crucial for temperature sensing applications in electronics, automotive systems, medical devices, and industrial equipment.

4. Using the Calculator

Tips: Enter all values in appropriate units. Typical B-values range from 2000K to 5000K. R₀ is often 10kΩ for 25°C thermistors. All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical B-value for NTC thermistors?
A: Common B-values range from 2000K to 5000K, with 3950K being a standard value for many 10kΩ thermistors.

Q2: Why use Kelvin instead of Celsius?
A: The equation requires absolute temperature. Results can be converted to Celsius by subtracting 273.15.

Q3: How accurate is this calculation?
A: The equation is an approximation. For highest accuracy, use manufacturer-provided tables or more complex models like full Steinhart-Hart equation.

Q4: What affects the B-value?
A: The B-value depends on the thermistor material and manufacturing process. It's typically specified over a temperature range (e.g., 25°C-85°C).

Q5: Can I use this for PTC thermistors?
A: No, this equation is only for NTC (Negative Temperature Coefficient) thermistors. PTC thermistors have different characteristics.