Optimizing the PLL
As soon as a SYNC signal is given cyclically, the measured value is visible under
fb19 measured sync interval. If an offline recording of this value is taken with the
scope of COMBIVIS 6, it can be determined how exactly the respective master can
preset the SYNCS. With this calculated deviation you can determine the setting for
fb11 set sync level. (largest value of fb19 – smallest value of fb19). The value for
fb11 should always be greater than the deviation of the measured values deter-
mined from the scope recording.
The gain of the PLL can be influenced with fb12 KP sync PLL and by way the
speed which reacts to changes of the SYNC. For this you can make an offline re-
cording with aa85, st00 and fb10. The offline measurement is started by setting a
value to fb10, thus the transient response of the PLL can be seen. At the point
where fb10 is preset, aa85 will change to a maximum value until the SYNC bit is
set in st00. This behavior can now be changed with fb12 until a required character-
istic occurs.
The changed values of fb11 and fb12 have only an effect when fb10 is written
again.
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