Accurate temperature monitoring is often crucial in metrology, since all of the other physical properties have thermal dependency. Your resistance or voltage precise measurements can be valid only for specific (often quite narrow) temperature range. Problem become even more tricky, once you realize that any thermometer itself is also affected by the thermal effects and have own uncertainty. We did some testing and even service of Fluke 52 II thermometer, however that is not precision type instrument.
In this article more advanced meter will be studied, and we will see what it takes to make good temperature measurement. Hart Scientific (today part of Fluke) 1529 Chub-E4 thermometer readout have multiple channel input, onboard battery power, outstanding accuracy, and abile to read various sensor types.
The Chub-E4 features:
- Four channels, configured as 4 PRT/thermistor inputs or 2 PRT/Thermistor + 2 TC(thermocouples) or 4 TC ports
- Displays eight user-selected data fields from any channel
- Logs up to 8000 date/timestamped readings
- Battery for 8+ hours of continuous operation
- RS232 remote interface (+GPIB is optional)
Inputs have either DWF connectors (compatible with bare wire, spade lugs or banana jacks) or thermocouple standard interface. Standard PRTs and RTDs with nominal value 100 Ω/25 Ω or 10 Ω are supported, reading using ITS-90, IEC-751 (DIN), or Callendar-Van Dusen conversion methods. Typical accuracies include ±0.004 °C at -100 °C and ± 0.009 °C at 100 °C. Thermistor readings are converted using the Steinhart-Hart polynomial or standard YSI-400 curve and are as accurate as ± 0.0025 °C at 25 °C with resolution of 0.0001 °.
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Diagnostics and repairs
Summary and conclusion
Modified: Jan. 15, 2019, 4:42 a.m.