
For the system to measure the Tuning Constant accurately, the VCO must
tune monotonically across ± 45% of the Voltage Tune Range around the
Center Voltage, and the slope must not go to zero. If the VCO Tuning
Constant is not measured by the system, the VCO must tune to within
± 10% of the Tune Voltage Range around the Center Voltage using the
defined Tuning Constant.
To protect the VCO from possible damage, the Tune Voltage output port
should not be connected to the VCO's input port until the Connect
Diagram is displayed.
Phase Detector: This is the Phase Detector that was defined for the
measurement. (For AM and Baseband Noise measurements, the Exter-
nal Phase/AM Detector must be selected in the Instrument Parameter
display.)
K_Detector Method: This is the calibration method selected for determin-
ing the Phase Detector Constant. (For descriptions of each method for de-
termining the Phase Detector Constant, please refer to Calibration Process
in the Measurement Definitions chapter of this manual.)
Detector Constant: This is the Phase Detector Constant (sensitivity of the
phase detector) used for the measurement. The accuracy of the Phase
Detector Constant is verified if the PLL suppression is verified. The
accuracy of the Phase Detector Constant determines the accuracy of the
noise measurement.
The Phase Detector Constant value, along with the LNA In/Out param-
eter, determines the HP 3048A System noise floor exclusive of the refer-
ence source. The Phase Detector Constant can be used to approximate the
phase detector's R port input level (refer to graph
1
Approximate HP 3048A
Phase Noise Floor vs. R Port Signal Level in Chapter 7, Quick Reference).
Param Summary 3-7
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