Transcription of Temperature Coefficient of Resistance for Current Sensing
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Temperature Coefficient of Resistance for Current Sensing
V I S H AY D A L E. Resistors White Paper Temperature Coefficient of Resistance for Current Sensing By Bryan Yarborough HOW Temperature AND CONSTRUCTION AFFECT Resistance STABILITY. OBJECTIVE represent ppm/ C that may be easier to consider is that 1. What is TCR? 3900 ppm/ C is the same as %/ C. These may seem like small numbers until you consider the change in 2. How is TCR determined? Resistance due to a Temperature rise of 100 C. For copper 3. How does construction affect TCR performance? that would cause a 39 % change in Resistance . 4. TCR in applications An alternate method for visualizing the effect of TCR is to consider it in terms of the rate of expansion of a material with 5. How to compare datasheets Temperature . Consider two different bars, A and B, that are (1) each 100 m in length. Bar A changes length at a rate of CAUSE AND EFFECT. +500 ppm/ C and bar B changes length at a rate of Resistance is a result of a combination of factors that cause +20 ppm/ C.
The temperature coefficient of resistance (TCR), sometimes referred to as resistance temperature coefficient (RTC), is a characteristic of the thermal energy component of the above imperfections. The effect of this resistance change is reversible as the temperature returns to reference temperature, assuming the grain structure was not altered
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