Temperature measurement

The temperature measurement is a crucial component of quality assurance in resistance measurements of electrical windings. It serves to compensate for temperature-sensitive measurement values and ensures precise, comparable results—regardless of the actual temperature of the test object.

Measurement methods and compensation

As standard, the thermometry is carried out using an external sensor placed in close proximity to the testing device. This method enables reliable detection of the ambient temperature and thus precise compensation for test objects at ambient temperature. The target temperature for compensation is usually 20 °C, but it can be individually adjusted to meet specific requirements.

All measurement results for copper resistances are automatically recalculated to the defined target temperature, taking into account the temperature coefficient. This effectively eliminates measurement deviations caused by temperature fluctuations.

Advantages of external temperature measurement

• Precise detection of the ambient temperature
• Simple positioning of the sensor
• Automatic conversion of the measurement results to the target temperature

Measurement on heated test objects

For DUT that have been heated during the production process, non-contact thermal sensing using an infrared thermometer is available. This method offers the following advantages:

• Fast, contactless measurement: No direct contact with the test object is required.
• Flexibility: Particularly suitable for DUT with temperatures above ambient.
• Adaptation to surfaces: The measurement can be adjusted to different surface conditions by setting the emissivity factor.

Requirements for precise infrared measurement:

• The DUT temperature must be above the ambient temperature.
• The DUT should have as homogeneous a temperature distribution as possible.
• The surface to be measured should remain consistently uniform.

Advantages of temperature compensation

• Increased measurement accuracy: Compensation of thermal-related measurement deviations.
• Comparability: Uniform measurement results regardless of test object temperature and environmental influences.
• Automation: Fully automatic conversion of resistance values to the target temperature.
• Flexibility: Choice between ambient sensor and infrared thermometer depending on DUT requirements.

Conclusion

Precise thermal evaluation and compensation are indispensable for accurate resistance measurements and for ensuring consistent quality standards. We offer flexible solutions for both ambient temperature measurement and non-contact temperature detection on heated test objects.