N5511A Phase Noise Test System User’s Guide 71
Absolute Measurement Fundamentals
Estimating the Tuning Constant
Estimating the Tuning Constant
The VCO tuning constant is the tuning sensitivity of the VCO source in Hz/V.
The required accuracy of the entered tuning constant value depends on the
VCO tuning constant calibration method specified for the measurement. The
calibration method is selected in the Calibration Process menu.
lists
the calibration method choices and the tuning constant accuracy required for
each.
Table 5-3
VCO tuning constant calibration method
VCO Tuning Constant Calibration Method
(selected in calibration screen)
Required Tuning Constant Accuracy (entered
in parameter screen)
Use the current tuning constant
(must be accurate from a previous
measurement of the same source).
Within a factor of 2 of actual value.
(Enter 1 E + 6 for Input Resistance.)
Measure the VCO tuning constant
Within a factor of 2 of actual value.
(Enter 1 E + 6 for Input Resistance.)
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