HP 8360 Using Detector Calibration, Getting Started Advanced, Figure l-22.Automatically Characterizing and Compensating for a Detector

Using Detector Calibration

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 437B to automatically characterize the operating regions and use this information to automatically compensate for the detector being used. The equipment setup shown in Figure l-22 assumes that .the steps necessary to correctly externally level have been followed.

Refer to menu map 9, USER CAL.

HP $378

POUER NETER

Figure l-22. Automatically Characterizing and Compensating for a Detector

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 437B 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 [USERCAL).

8.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.

Getting Started Advanced 1-47