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Termistor NTC

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Re: Termistor NTC

Notapor pichu » Jue, 10 May 2012, 11:35



Introduction: . . . . . . . . . . . . . . . . . . . . . . . .2-3
Overview of Markets and Applications . . . .4-5
NTC Thermistor Theory . . . . . . . . . . . . . . .6-42
Chip Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Volume Resistivity . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Slope (Resistance Ratio) . . . . . . . . . . . . . . . . . . . . . . .9
Alpha (Temperature Coefficient) . . . . . . . . . . . . . . . .10
Modelling of Conduction in Thermistors . . . . . . . . . .11
Mathematical Modelling of Thermistors . . . . . . . . . .12
Exponential Model of NTC Thermistors . . . . . . . . . .13
Beta Value, b, or Sensitivity Index . . . . . . . . . . . . . .13
The Steinhart-Hart Thermistor Equation . . . . . . . . . .16
Summary of Steinhart-Hart Equation . . . . . . . . . . . .19
Steinhart Coefficients for BetaTHERM
standard part numbers . . . . . . . . . . . . . . . . . . . . . . . .19
Factors affecting measured resistance value of
thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Self heating effect of thermistors . . . . . . . . . . . . . . . .20
Zero-power resistance characteristic . . . . . . . . . . . . .20
Thermal Time Constant (T.C.) . . . . . . . . . . . . . . . . . .21
Thermal Dissipation Constant (D.C.) . . . . . . . . . . . .22
VoltageÐCurrent Characteristics . . . . . . . . . . . . . . . .22
Tolerance of Thermistors . . . . . . . . . . . . . . . . . . . . . .23
BetaCURVE and BetaCHIP Products . . . . . . . . . .23-24
Stability & reliability of thermistors . . . . . . . . . . . . .25
Specification of thermistors for applications . . . . . . .25
Thermistor Application Notes . . . . . . . . . . . .26
Zero power sensing applications . . . . . . . . . . . . . . . .26
Linear thermistor networks . . . . . . . . . . . . . . . . . . . .28
Self-Heat sensing applications . . . . . . . . . . . . . . . . . .29
Time dependency Applications . . . . . . . . . . . . . . . . .30
Temperature compensation . . . . . . . . . . . . . . . . . . . .31
Circuit notes for thermistors . . . . . . . . . . . . .32
Wheatstone Bridge circuits . . . . . . . . . . . . . . . . . . . .32
Voltage divider circuits and linearization . . . . . . . . . .35
Thermistors interfaced to computers . . . . . . . . . . . . .38
Technical Note from Analog Devices . . . . . .39
Resistance versus Temperature Tables for
BetaTHERM thermistors . . . . . . . . . . . . .43-47
Thermistor coefficients and deviation
values for BetaTHERM materials . . . . . .48-49
Resistance ratio, slope and Beta specifications
for BetaTHERM materials . . . . . . . . . . . . . . .50
pichu
 
Mensajes: 244
Registrado: Vie, 08 Jul 2011, 22:01


Re: Termistor NTC

Notapor pichu » Jue, 10 May 2012, 11:36

NTC Thermistor theory




NTC Thermistor Theory . . . . . . . . . . ………. . . . ...2
Chip Configuration . . . . . . . . . . . . . . . . . . . . . . . .. . . .2
Volume Resistivity-. . . . . . . . . . . . . . . . . . . . . .. . . . . .3
Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 4
Slope (Resistance Ratio)- . . . . . . . . . . . . . . . . ... . . . .5
Alpha (Temperature Coefficient) . . . . . . . . . . . . . . . . 6
Modelling of Conduction in Thermistors . . . . . .. . . ...7
Mathematical Modelling of Thermistors . . . . . . . . . ...8
Exponential Model of NTC Thermistors . . . . . . . . . . .9
Beta Value, b, or Sensitivity Index . . . . . . . . . . . .. . . .9
The Steinhart-Hart Thermistor Equation . . . . . . . . . .12
Summary of Steinhart-Hart Equation . . . . . . . . . .. . .15
Steinhart Coefficients for BetaTHERM
standard part numbers . . . . . . . . . . . . . . . . . . . . . . . .16
Factors affecting measured resistance value of
thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . .16
Self heating effect of thermistors . . . . . . . . . . . . . . .16
Zero-power resistance characteristic . . . . . . . . . . . . .16
Thermal Time Constant (T.C.) . . . . . . . . . . . . . .. . . .17
Thermal Dissipation Constant (D.C.).. . . . . . . . . . . .18
Voltage-Current Characteristics . . . . . . . . . . . . . .. ..18
Tolerance of Thermistors . . . . . . . . . . . . . . . . . . . . .19
BetaCURVE and BetaCHIP Products . . . . . . . ...19-20
Stability & reliability of thermistors . . . . . . . .. . . . .21
Specification of thermistors for applications . . . . . .21
Your Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22-24

pichu
 
Mensajes: 244
Registrado: Vie, 08 Jul 2011, 22:01


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