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      [2010-05-18 14:53:27] Quick Way to Test NTC Thermistors (A)

      We, the Department of Technical Engineering (“DTE” as below), are instructed by KPD Technology Development Limited (the “Company”) to represent the best interest of the clients of the Company and provide a technical report to you and the Company for due and careful consideration before significant investment/procurement decision to make.
      1. PURPOSES
      DTE provides you with an easy and quick way to test NTC thermistors under circumstances that no specialized NTC thermistor detector, specialized meter, and alligator clips are available. Although the accuracy cannot be taken into consideration for professionalism purpose, this way introduced hereby can provide the approximation of resistance value and accuracy of the thermistors.
      DTE advises you to prepare the following tools and materials:
      1. Two units of universal meters;
      2. One set of alligator clips;
      3. One unit of ±0.1℃ thermometer; and
      4. One pair of stainless alligator clips;
        1. Air-condition a room to a stable temperature degree around 25±0.1℃;
        2. Place the thermometer in the room and monitor the room temperature;
        3. Attach the pair of alligator clips to both ends of the universal meters A and B;
        4. Attach the wires of the standard thermistor to alligator clips, and connect one end of the universal meters A with one end of universal meters B. After this, turn on the universal meters and properly adjust its thermistor measuring parameter, and resistance value of the thermistor will be shown according to the current room temperature on universal meters (Note: nominal resistance value should be within ±0.1% and B value should be ±1%).
        5. Place the alligator clips nearby the thermometer in order to allow universal meters to monitor the temperature variables in the interior room.
        6. The constant temperature of the thermistor inside the room can be measured when universal meters that monitors the room temperature shows a relative stable values reading a stable temperature in the room. By then, a comparative measurement can be conducted when the resistance value and accuracy shown on the monitoring thermistor attached by alligator clips is comparable to those of a thermistor to be measured.
        7. Qualified products can be identified according to the room temperature when the thermistor to be measured falls into the nominal resistance value of ±5%.
        1. The room temperature must be controlled within the temperature degree range of 25±1℃, and thus all windows must be closed up when the measurement test is underway in order to reduce the air flow and prevent interior personnel moving back and forth.
        2. If the stable temperature cannot reach the accuracy, a thermistor that contains the same resistance accuracy could be used as a room temperature monitor for comparative measurement.
        3. Two units of universal meters MUST be correctly adjusted before the measurement and consistency test on the two units should be run at least twice.
        4. The constant temperature of thermistor to be measured in the room should have a stable temperature over thirty minutes and allow a second test in 12 hours after the first test.
        5. The thermometer, the thermistor monitor, and the thermistor to be measured should be placed in the same area of the room so as to ensure the accuracy of the measurement.
        6. When the thermistor is measured, the measuring personnel should try his best to keep his hands off the thermistor at a certain distance in the event of the difference caused by the body temperature.
      The information set out hereof only represents opinions and recommendations provided by the DTE, and must not be considered the very scientific approaches/technologies even though such information might be of great assistance to you and your associates. We would love to avail this opportunity to express our greatest gratitude to you and your constant support in our work together with your affirmative recognition of the information provided hereof.
      Yours faithfully,
      By order of the Company
      Department of Technical Engineering
      Contact: Shenzhen KPD Electronics Co., Ltd
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