LT-Spice NTC resistor?

Elektrotechn123ByElektrotechn123

Hello,

The temperature of an NTC resistor as well as the direct measurement of current and voltage with LT Spice are to be carried out.

According to another article, a resistor must be connected in series with the NTC thermistor. Unfortunately, I can't find anything about a series resistor in our textbook. My logic tells me that I would choose a series resistor R2 << R1 (e.g., 1 mOhm?). This way, the current would be barely affected, and the voltage can be distributed. Is this approach correct? And what about the graph?

Thanks.

(No Ratings Yet)
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Lutz28213
Lutz28213
2 years ago

If you mean “m” Milli-Ohm, that’s naturally totally unrealistic and too small. “M” like “mega2” would be too big.
How large is the nenn resistance Rn?

  • Voltage measurement: For this you need the pre-resistance Rv, because otherwise the NTC is always the supply voltage. Rv may be approximately in the order of magnitude of Rn
  • Electricity: Of course we are the total current through Rv smaller – yes and? You can select your test voltage accordingly.
  • Temperature: I want you to measure? Anyway, you write that. You can reset these at most by determining the current NTC value (if you know Rn and Tn and B),
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