Explain the working of TDR along with its symbol and characteristics.

Explain the working of TDR along with its symbol and characteristics. 
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1 Answer

Answer :

  • TDR are also called as thermistors.
  • Thermally sensitive materials are used to manufacture thermistors.
  • Depending on the temperature co- efficient of resistance value thermistors are classified as

NTC Thermistors: Negative temperature co- efficient

PTC Thermistors: Positive temperature co- efficient.

Symbol

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Diagram
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NTC Thermistors
NTC thermistors have negative temperature co-efficient of resistance where resistance of the resistive material decreases with increase in temperature.
NTC thermistors are used when continuous change of resistance is required over wide temperature range.
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PTC Thermistors
PTC thermistors have positive temperature co-efficient of resistance in which resistance value decreases with decrease in temperature.
PTC thermistors are used when a drastic change in resistance is required at specific temperature.
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