The S331P supports the following user calibration methods for Cable and Antenna measurements.

For all measurement types except Transmission (Ext Sensor), you can manually calibrate the S331P using an external precision OSL calibration kit. Refer to OSL Calibration Setup for calibration instructions.

Select the Transmission (Ext Sensor) calibration method for transmission measurements with an external power sensor. A normalization process is used to calibrate the frequency response of the sensor and any test port cables/adapters used. An optional zeroing step is performed to remove any residual noise in the sensor, followed by a normalization step performed with the sensor connected directly to the S331P RF test port or through a test port cable. Refer to Transmission (Ext Sensor) Setup for the calibration procedure.

When this calibration method is active and not combined with OSL, the S331P automatically applies the default ReadyCal to all measurements other than Transmission.

The combined calibration method OSL + Transmission allows the instrument to be calibrated once for all the supported measurement types, eliminating the need to re-calibrate when switching from one type of measurement to another, such as Return Loss to Transmission. Refer to OSL + Transmission (Ext Sensor) Setup for calibration instructions.