The hybrid coupler company keys installed below the display window are used to measure and set up the power meter. The functions of hybrid coupler company keys are described as follows:

ZEROCAL key: This key is used to zero and calibrate the power probe. If the power probe needs to be zeroed and calibrated at the same time, the probe must be connected to the output port of the calibrator. When the key is pressed, the power probe will be zeroed automatically, and then the calibration data processing process will be automatically completed. The process completes the linear calibration of the power probe and the power tracing, and the calibration data will be stored in the memory of the power meter host. If only the power probe is calibrated, the power probe does not need to be connected to the output port of the calibrator. When the key is pressed when the probe is not connected to the calibrator, the power meter only completes the automatic zeroing function. When the power probe is calibrated, it is best to connect the probe and measured signal source together, in the signal source output power off state operation, so that the power meter can be measured and power probe between the micro voltage normalization off.

FREQ key: This key is used to input the frequency of the measured signal. The power meter automatically calls the calibration factor value of the power probe corresponding to the set frequency to correct the measured value, so as to improve the accuracy of power measurement. If the frequency change of the input signal is too fast to be placed in the front panel, you can input a voltage value corresponding to the frequency change of the signal source from the "VFIn" on the back panel of the power meter, and through the appropriate menu setting, you can quickly call the calibration factor value of the corresponding frequency. If the power meter is in remote control mode, the power meter can read frequency information from the GP-IB bus.

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