Zero Power Resistance Value RT (Ω)
RT imatanthawuza mtengo wokana womwe umayesedwa pa kutentha kwapadera T pogwiritsa ntchito mphamvu yoyezera yomwe imayambitsa kusintha kosawerengeka kwa mtengo wotsutsa wokhudzana ndi cholakwika chonse cha muyeso.
Ubale pakati pa mtengo wotsutsa ndi kusintha kwa kutentha kwa zinthu zamagetsi ndi motere:
RT = RN expB(1/T – 1/TN)
RT: NTC thermistor resistance pa kutentha T (K).
RN: NTC thermistor resistance pa kutentha kwake TN (K).
T: Kutentha kodziwika (K).
B: Zinthu zokhazikika za NTC thermistor, zomwe zimadziwikanso kuti thermal sensitivity index.
exp: exponent yotengera nambala yachilengedwe e (e = 2.71828…) .
Ubalewu ndi wamphamvu ndipo umakhala wolondola pang'ono pokhapokha kutentha kwa TN kapena kukana RN, popeza zinthu zosasintha B ndi ntchito ya kutentha kwa T.
Kuvotera Zero Power Resistance R25 (Ω)
Malinga ndi muyezo wadziko lonse, mtengo wokana mphamvu ziro ndi kukana kwa R25 kuyeza ndi thermistor ya NTC pa kutentha kwa 25 ℃. Mtengo wotsutsa uwu ndi mtengo wotsutsa mwadzina wa NTC thermistor. Nthawi zambiri anati NTC thermistor kuchuluka kukana mtengo, amatanthauzanso mtengo.
Material Constant (thermal sensitivity index) B mtengo (K)
Makhalidwe a B amafotokozedwa motere:
RT1: Zero mphamvu kukana pa kutentha T1 (K).
RT2: Zero mphamvu kukana mphamvu pa kutentha T2 (K).
T1, T2: Kutentha kwapadera kuwiri (K).
Kwa zotenthetsera wamba za NTC, mtengo wa B umachokera ku 2000K mpaka 6000K.
Zero Power Resistance Temperature Coefficient (αT)
Chiŵerengero cha kusintha kwachibale mu kukana kwa ziro-mphamvu kwa thermistor ya NTC pa kutentha kwapadera ndi kusintha kwa kutentha komwe kumayambitsa kusintha.
αT: zero mphamvu kukana kutentha kokwanira pa kutentha T (K).
RT: Zero mphamvu kukana mphamvu pa kutentha T (K).
T: Kutentha (T).
B: Zinthu zokhazikika.
Chigawo cha Disipation (δ)
Pa kutentha kwapadera kozungulira, mphamvu yowonongeka ya NTC thermistor ndi chiŵerengero cha mphamvu yomwe imatayika mu resistor ndi kusintha kofanana kwa kutentha kwa resistor.
δ : choyerekera cha dissipation cha NTC thermistor, (mW/ K).
△ P: Mphamvu yogwiritsidwa ntchito ndi NTC thermistor (mW).
△ T: NTC thermistor imadya mphamvu △ P, kusintha kofananira kwa kutentha kwa thupi la resistor (K).
Nthawi Yotentha Yokhazikika ya Zida Zamagetsi (τ)
Pansi pa mphamvu ya zero, pamene kutentha kumasintha mwadzidzidzi, kutentha kwa thermistor kumasintha nthawi yofunikira kwa 63.2% ya kusiyana kwa kutentha kuwiri koyambirira. Kutentha kwa nthawi yotentha kumayenderana ndi mphamvu ya kutentha kwa NTC thermistor ndipo imagwirizana mosagwirizana ndi koyefi yake yotaya.
τ: nthawi yotentha nthawi zonse (S).
C: Kuchuluka kwa kutentha kwa NTC thermistor.
δ : gawo la kutentha kwa NTC thermistor.
Adavotera Power Pn
Mphamvu yovomerezeka ya thermistor ikugwira ntchito mosalekeza kwa nthawi yayitali pansi pamikhalidwe yodziwika bwino. Pansi pa mphamvu iyi, kutentha kwa thupi kukana sikudutsa kutentha kwake kokwanira.
Kutentha kwakukulu kwa ntchitoTmax: kutentha kwakukulu komwe thermistor imatha kugwira ntchito mosalekeza kwa nthawi yayitali pansi pamikhalidwe yodziwika bwino. Ndiye kuti, T0- Kutentha kozungulira.
Zida zamagetsi zimayesa mphamvu Pm
Pa kutentha komwe kumatchulidwa, mtengo wotsutsa wa thupi lotsutsa lotenthedwa ndi muyeso wamakono ukhoza kunyalanyazidwa pokhudzana ndi cholakwika chonse cha muyeso. Nthawi zambiri pamafunika kuti kusintha kwa mtengo wokana kukhale kwakukulu kuposa 0.1%.
Nthawi yotumiza: Mar-29-2023