研究目的
To establish RF power sensor calibration in the frequency range of 10 MHz to 18 GHz at RCM - LIPI to build the measurement traceability of RF power sensor in Indonesia.
研究成果
The calibration system of RF power sensor in the frequency range of 10 MHz to 18 GHz has been established at RCM - LIPI with a measurement uncertainty of 2.3% up to 18 GHz. The traceability of RF power measurement in Indonesia has been achieved through this calibration system. Further works are required to build the heating block as temperature controller for DUT thermistor mount, and to reduce the measurement uncertainty.
研究不足
The drifts of temperature highly affect the repeatability of thermistor mount. The ambient temperature condition should be kept stable within ±1°C to get better repeatability. Further work is required to build a heating block as a temperature controller for DUT thermistor mount and to reduce the measurement uncertainty.
1：Experimental Design and Method Selection:
The RF power sensor calibration system uses a modified direct comparison transfer method for more accurate measurement results. A terminating power standard M110 is used as the standard power sensor, and a digital multimeter measures DC voltages before and after the application of RF power.
2：Sample Selection and Data Sources:
The system calibrates RF power sensors from calibration laboratories and industries in Indonesia.
3：List of Experimental Equipment and Materials:
Includes a signal generator, power splitter, power indicating instruments, terminating power standard M110, dual type power meter 1806A, digital multimeter, feedthrough mount F1109, RF control unit, and vector network analyzer.
4：Experimental Procedures and Operational Workflow:
The calibration is conducted automatically using a program built from C#. The system measures the powers of the standard power sensor and the monitoring power sensor first, then the DUT power sensor and the monitoring power sensor.
5：Data Analysis Methods:
The calibration factor of the DUT power sensor is calculated using a specific equation considering the equivalent source mismatch of power splitter and the reflection coefficients of the standard and DUT power sensors.
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