开云体育Tobias,As?G?ran said, 8568 and 8566 are different design. I have no knowledge of 8568 so I can only speak for 8566. In 8566, if the frequency span is less than 5mhz, YTO is phase locked during the entire sweep?— the FM coil is driven by the loop’s LPF?so that the YTO is phase locked. Side note, HP called it?“integrator" which is not what my?professor and textbook say. Integrator(1/s) is not LPF(a/(s+a)) mathematically but oh well... For frequency span >5mhz, the YTO is?phase locked to the sweep start frequency during retrace(Lock), then the sample/hold circuit (between YTO’s second LPF and FM coil) is first in sample mode to store the tuning voltage from the LPF, then is placed in hold mode, which breaks the loop, the capacitor holds the constant voltage to the FM coil. Then the sweep ramp is fed to the YO mail coil to sweep(Roll). This Lock-and-Roll scheme is also used in 8340/41 too. Hope that helps! Calvin On Oct 18, 2017, at 12:53 PM, Tobias Pluess tobias.pluess@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
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