Estimating The Tuning Constant - Agilent Technologies E5500A User Manual

6 Absolute Measurement Fundamentals

Estimating the Tuning Constant

Estimating the Tuning Constant
6-12 E5500 Phase Noise Measurement System Version A.02.00
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.
choices and the tuning constant accuracy required for each.
Table 6-3 VCO Tuning Constant Calibration Method
VCO Tuning Constant Calibration Method
(selected in calibration screen)
Use the current tuning constant
(must be accurate from a previous
measurement of the same source).
Measure the VCO tuning constant
Calculate from expected T. Constant
Table 6-3 lists the calibration method
Required Tuning Constant Accuracy
(entered in parameter screen)
Within a factor of 2 of actual value.
(Enter 1 E + 6 for Input Resistance.)
Within a factor of 2 of actual value.
(Enter 1 E + 6 for Input Resistance.)
Exact, within 5% of actual.
(Also requires that entered Input
Resistance value is accurate.)
Document Part No. E5500-90024 Ed. 1.0