Hi,
Can somebody tell me the temperature specs of this NTC resistor? Through Google I've come across some hits, but they don't mention specs.
Thank you,
Huub
- posted
18 years ago
specs Siemens NTC K164/1K5
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- posted
18 years ago
formatting link
RL
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- posted
18 years ago
forgotten - use curve 1011
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RL
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- posted
18 years ago
Thank you.
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- posted
18 years ago
There 1 problem for me: I need to calculate the temperature, not a resistance. The interface I'm working with, and where the 1.5K NTC is connected to, provides me with a digit from 0 to 1023. Let's say I get the value 484. What would the temperature be then?
Thank you for helping me out.
Huub
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- posted
18 years ago
You've only got a 10-bit ADC? So calculate the input for every temperature over the range and create a lookup table. It's hardly worth doing the calculations (which involve ln(x)) even if you had the coefficients.
Best regards, Spehro Pefhany
-- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
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- posted
18 years ago
It depends on what the digits represent - how they are generated.
If they represent a recording of resistance, then you need to know what zero and full scale represent, and whether the scale is linear or logarithmic, to interpolate intermediate values.
The Siemens app notes give a formula for converting temp to resistance or vice versa, using material type 'K' values.
Why are you using this part, if it is so unfamiliar to you? Are you just doing homework for school?
RL
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- posted
18 years ago
It's for a project I'm working on. The interface it suited to be connected with an NTC thermistor, but the analog input itself is converted through a 10 bits AD converter. So, when I probe the temperature, I have to convert the value from the interface into the data I actually want. And yes, it is unfamiliar to me, since I'm a technical informatics engineer, not an applied physics or electronics engineer.