User`s guide

Agilent Technologies E5500 Phase Noise Measurement System 8-27
Residual Measurement Fundamentals
The Calibration Options
Figure 8-17 Carrier-to-spur Ratio of Non-modulated Signal
5. Connect the phase detector.
6. Adjust the phase difference at the phase detector to 90 degrees
(quadrature) either by adjusting the test frequency or by adjusting an
optional variable phase shifter or line stretcher. Quadrature is achieved
when the meter on the front panel of the Agilent/HP 70420A is set to
center scale.
NOTE For the system to accept the adjustment to quadrature, the meter must be
within
±
2mVto
±
4mV.
7. Enter sideband level and offset.
8. Check quadrature and measure the phase detector constant.
9. Remove audio source.
10. Reset quadrature and measure phase noise data.