USACRREL (US Army Cold Regions Research and Engineering Laboratory) precise thermistor meter
Abstract
To facilitate the study of frazil ice in the field, a highly accurate, portable water temperature meter was required. The USACRREL Precise Thermistor Meter was designed and built to meet this need. The meter is rugged, battery-operated, waterproof, and able to operate over a wide range of ambient temperatures. A unique feature of this instrument is the use of software to compensate for temperature-dependent variation in the analog electronics. The circuitry consists of an analog printed circuit board and a low power microcomputer. The resistance of a calibrated thermistor is determined and its temperature calculated using the Steinhart-Hart equation. The accuracy of the meter was determined both theoretically and in cold room tests. The hardware and software used in the meter are described.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- December 1985
- Bibcode:
- 1985STIN...8630129T
- Keywords:
-
- Analog Data;
- Calibrating;
- Circuit Boards;
- Fabrication;
- Ice;
- Measuring Instruments;
- Microcomputers;
- Portable Equipment;
- Precision;
- Printed Circuits;
- Temperature Measurement;
- Thermistors;
- Water Temperature;
- Accuracy;
- Computer Programs;
- Range (Extremes);
- Systems Engineering;
- Variations;
- Instrumentation and Photography