MeasurementBlues

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Senior Technical Editor

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MeasurementBlues

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  • 02.01.2016
  • Minimize measurement errors in RTD circuits
  • Related article: Temperature sensors are improving, but select carefully http://www.edn.com/design/sensors/4441379/Temperature-sensors-are-improving--but-select-carefully
  • 02.09.2016
  • Temperature sensors are improving, but select carefully
  • Remember that CJC on a thermocouple is only good when you really know the temperature at the junction where the thermocouple wires meet the terminals of the instrumentation. Thus, you need material with high thermal conductivity between the terminals and the CJC temperature sensor. I've seen instruments with heavy metal thermal blocks to minimize the temperature difference between the CIC sensor and the terminals. Also, you need to consider there can be differences in temperature from one set of termianl connections to another. The goal is the minimize temperature gradients as much as possible. Air flow is another consideration, you want temperature at the CJC sensor and at the thermocouple connections to be stable. Heat from electronic components can cause thermal drift and gradients.
  • 02.09.2016
  • Bandwidth 101
  • What did you find interesting about the instrumentation?
  • 09.27.2013
  • Bad crimp, bad news
  • I have an air conditioner with a power cord that has a, LCDI made by Tower Manufacturing of Providence, RI. I doubt it's the same Tower mentioned here. http://www.towermfg.com/lcdi.htm
  • 01.29.2016
  • It’s always a capacitor
  • Hello Paul, I once had an air conditioner fall out the window. I caught it by the power cord and pulled it back in. The cord got damaged but the unit still worked. I need to replace the power cord before putting it back into service. But this is New England where we use air conditioners for about 6 weeks. http://www.eetimes.com/author.asp?section_id=30&doc_id=1324136
  • 02.01.2016
  • Minimize measurement errors in RTD circuits
  • In general, I found that 4-wire RTDs were mostly used for calibration and 3-wire RTD for most industrial applications because they are less expensive than those with 4-wires. I worked for Azonix when they developed a precision RTD thermometer and calibrator. Here's one I found on eBay. http://www.ebay.com/itm/Azonix-A1011-Digital-Precision-RTD-Thermometer-/311056395475