Analyzing the Automatic Power Level Control Effect of a Signal Generator in RF Power Sensor Calibration by a Direct...

Area of Science:

• Electrical Engineering
• Metrology

Background:

• Direct Comparison Transfer Method (DCTM) is widely used for radio frequency (RF) power sensor calibration.
• Automatic Power Level Control (APLC) is often recommended with DCTM to maintain stable signal generator output.
• Accurate calibration is crucial for reliable RF measurements.

Purpose of the Study:

• To evaluate the impact of Automatic Power Level Control (APLC) on Direct Comparison Transfer Method (DCTM) calibration of RF power sensors.
• To compare calibration factor values obtained with and without APLC.
• To determine the optimal DCTM application for different connector types and frequency ranges.

Main Methods:

• The study employed the Direct Comparison Transfer Method (DCTM) for RF power sensor calibration.
• Mechanisms of APLC for RF signal generators were analyzed.
• Calibration factors were compared between DCTM with APLC and DCTM without APLC.
• Calibrations were performed on sensors with coaxial and waveguide connectors.

Main Results:

• DCTM with APLC provides consistent results for RF power sensor calibration.
• A significant difference in calibration factor values was observed when APLC was not used.
• Waveguide power sensors at millimeter wave frequencies showed particular sensitivity to the absence of APLC.

Conclusions:

• APLC is a critical component for accurate DCTM calibration of RF power sensors, especially for waveguide types at millimeter wave frequencies.
• The DCTM without APLC may lead to inaccuracies for specific sensor configurations.
• Further research into APLC mechanisms can enhance calibration reliability.