Thermistor-type power meters use DC substitution to measure microwave and millimeter wave power.To compensate for environmental temperature changes,these power meters typically employ both measurement and compensation bridges,operating in a dual-bridge mode.When calibrating a coaxial thermistor-type power sensor using a microcalorimeter power standard,the measurement bridge alone cannot be used,even with stable environmental temperatures.To ensure valid calibration results,both environmental temperature compensation and ceramic core temperature variation compensation(due to dual-element errors)are necessary.Experiments show that at 18 GHz and 10 mW power level,the substituted power deviation for an N-type coaxial thermistor power sensor is 0.38% when measured with single versus dual-bridge power meters.For waveguide thermistor-type power sensors with single-element structures,calibrating effective efficiency does not require consideration of single versus dual-bridge measurement issues.
metrologydual-element errorthermistor-type power meterpower sensorsubstituted powermeasurement bridgecompensation bridge
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