8485D
In this functional test the calibration factor data is read from the EEPROM of the power sensor or the previously saved or loaded calibration factor file. Then it is compared to the measured data run in the Calibration Factor test. The difference between the original and measured calibration factors shows how much the calibration factor has deviated since the last calibration.
As the specified maximum uncertainty is a relative uncertainty, the deviation will be computed as relative to the original calibration factor.
The calibration factor uncertainty of the 8485D UUT depends on the calibration factor uncertainty of the 8485D Standard Power Sensor. The calibration factor uncertainty of the Standard Power Sensor is smaller when calibrated by itself than when calibrated with the 11708A 30dB reference attenuator. To meet the Maximum Calibration Factor Uncertainty Specification of the UUT, it is recommended to have the Standard Power Sensor calibrated by itself without the reference attenuator. Ask your service provider to calibrate the 8485D Standard Power Sensor and reference attenuator separately.
| Instrument | Recommended product | Alternative product |
| Power Meter | N1914B | N1914A E4419B N1912A |