
How do You Enhance the Tuning Range?
The Enhanced Tuning Range allows the system to use the total VCO
Tuning Range available from a calibrated DC FM Source when Defining
the Measurement:
• Enter the VCO Tuning Constant and the Tune Port Resistance in the
Instrument Parameter display. These entries must be within ± 5% of
there actual values for the measurement to be properly calibrated. The
verification of the Loop Suppression will verify the entered accuracy of
the VCO Tuning Constant, Tune Port Resistance, and Phase Detector
Constant.
• Enter a Voltage Tuning Range 5 to 10 times the maximum voltage
required to achieve the peak deviation of the VCO. This artificially
increases the PTR. (The HP 3048A will allow a maximum Voltage
Tune Range of ± 10 volts).
• Choose "Compute from expected T. Constant" in the Calib. Process
display. This restricts the system from measuring the non-linear VCO
Tuning Constant.
• Verify the Beatnote is less than 10% of the PTR at the Connect
Diagram. This insures the System can Zero-Beat the sources and
measure the Phase Detector Constant. (Phase Detector Constant must
be entered in the Calib. Process display if it cannot be measured by
the system).
2-26 Instr. Params: $N w/PLL
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