
System Control The system can control the calibration source if it is a
supported RF Source and has been configured in the System Configuration
Table. The RF Source to be used as the calibration source must also be
configured in the Source Control Diagram.
Calibration Process under system control requires the entry of the FM
Rate and Deviation in the Calibr. Process menu. The Connect Diagram
will provide the connection information for the calibration source. Once
the calibration source is connected to the system, the HP 3048A will
set the calibration source to the entered parameters, adjust the frequency
to obtain quadrature, and measure the Discriminator Constant. After the
calibration process is completed the Connect Diagram will appear again
showing the connections for the DUT. The output level of the DUT must
be within ±0.3 dB of the calibration source level to ensure the validity of
the Discriminator Constant.
Considerations for the Derive From FM Rate and
Deviation Method
The HP 11848A's front-panel meter can be used as an aid for adjusting
quadrature. The meter has a full scale sensitivity of 20 mV with a
2 mV/Div resolution. The meter reading must be within ±1 division
of center scale for starting a measurement and must remain within ±2
divisions of the center during the measurement.
2-88 Calibr Process:
<3>N
w/FM Discriminator
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