best way to measure the thermistor

Hello!

We are looking for a solution for measuring temperature thermistor. I've read the material resources OR recommend for the thermistor measures.
Can you give me some ideas other alternatives for usable material temperature through resistance (we would use the default configuration, excitation of 2.5 Volts and a resistance of 5 + thermistor). So we need something capable of giving 2, 5V output and to measure the tension caused falling across the thermistor.

Would be a NI USB-6009 suitable for this task? I guess that the resolution is not enough maybe?
Another option might be cheaper with a USB-GPIB interface Keithley 2010 multimeter, but in this case what should we use as a reference of tension?

Thanks for the tips!

I want to second opinion to Henrik about repeatability in high resolution.  Measures of temperature with Thermistors are particularly difficult.  You have to worry:

  1. Auto-echauffants because of the power generated by the excitation current

  2. Time to balance the thermistor and electronic

  3. Stability of the excitation source

  4. Stability of the measuring device

In general, if you want something more than about 1% reproducibility, things start to me interesting.  Of course, it's what makes it fun to do.

If you go the road of the sound card, remember that while most modern computers have quite high resolution a/d (sometimes up to 24 bits at 96 kHz) converters, you must watch the noise figures to get what you can actually solve.  Off-board solutions (e.g., M - Audio Delta 44) will give you the best numbers of noise, since the ADCs are isolated from noisy inside your computer.

Good luck and have fun.

Tags: NI Software

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