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Using Detector
Detector calibration is useful for characterizing and compensating for
Calibration
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