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Detector calibration is useful for characterizing and compensating for

negative diode detectors used in external leveling. Detectors may be
characterized by three operating regions as shown in Figure 1-12:
the square law, the linear, and the transition region. The following
steps use an HP 

 to automatically characterize the operating

regions and use this information to automatically compensate for
the detector being used. The equipment setup shown in Figure 
assumes that 

 steps necessary to correctly externally level have

been followed.

Refer to menu map 9, USER CAL.

 

 

1. Connect the power meter as shown.

2. Zero and calibrate the power meter/sensor.

3. Enter the appropriate power sensor calibration factors into the

power meter.

4. Enable the power meter/sensor cal factor array. For operating

information on the

HP 

 power meter refer to its operating and service manual.

5. Connect the power sensor to the output of the coupler

(or splitter).

6. On the synthesizer, set the power level and start/stop frequency

information as desired.

7. Press 

 Select Ext Det Gal . The power meter is now under synthesizer

control and is performing the sequence of steps necessary to
generate the compensation information.