Using Detector
Calibration
Detector calibration is useful for characterizing and comp ensating for
negative dio de detectors used in external leveling. Detectors maybe
characterized by three op erating regions as shown in Figure 1-12: the
square law, the linear, and the transition region. The following steps
use an HP/Agilent 437B to automatically characterize the operating
regions and use this information to automatically comp ensate for
the detector b eing used. The equipment setup shown in Figure 1-22
assumes that the steps necessary to correctly externally level have
been followed.
Refer to menu map 9, USER CAL.
Figure 1-22. Automatically Characterizing and Compensating for a Detector
1. Connect the power meter as shown.
2. Zero and calibrate the p ower meter/sensor.
3. Enter the appropriate power sensor calibration factors into the
power meter.
4. Enable the power meter/sensor cal factor array.For op erating
information on the HP/Agilent 437B p ower meter, refer to its
operating and service manual.
5. Connect the power sensor to the output of the coupler
(or splitter).
6. On the swept signal generator, set the p ower level and start/stop
frequency information as desired.
7. Press
4
USER CAL
5
.
8.
Select
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Ext Det Cal
. The p ower meter is now under swept
signal generator control and is performing the sequence of steps
necessary to generate the compensation information.
Getting Started Advanced 1-47
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