User manual

Servo Parameter Definitions
Used to “fine tune” the machine for servo into lock.
Servo Wait (frames)
Wait this number of frames after a play command before beginning servo action.
This parameter is used to delay the onset of servo action for a given number of frames. This can be set to allow
time for the machine’s transport to stabilise before beginning servo action. Some machines may give
inaccurate information to the MCS when servo is begun too quickly. Increasing this value may help to
compensate for this.
Lock Acceleration (frames)
Number of frames away from lock that minimum servoing is applied.
Servo action is applied in 3 stages by the MCS, each stage being more aggressive. If the machine persistently
overshoots the lock position during locking, increasing this value will apply gentler servoing as the machine
approaches lock and may help reduce this.
Hold Off time (frames)
Wait for this number of frames after fine slewing into lock has achieved a zero error before releasing.
Normally, when zero error has been achieved the machine is released from servo in order to lock to the video
frame edge. However, depending upon the transport ballistics, some machines may have moved through zero
error and be moving away from zero error at this point. If released in this situation the machine may repeatedly
report lock & locking. Increasing the hold off time causes the MCS to wait after zero error has been achieved
before releasing the machine.
Start-up time (frames)
Play command is issued when the timeline is this many frames behind the machine position.
When machine synchronisation is begun after the PLAY key has been pressed, the system will pre-roll by 16
frames and then run the timeline through the machine position. If the machine error is observed to count down
slowly from 16 frames to zero, adjusting this parameter by 2 frames may correct this. If the machine can be seen
to have several frames to servo after receiving its play command, adjusting this parameter may correct this.
Park Time (frames)
Machine parks ahead when chasing to a moving timeline by this many frames.
Servo type (0, 1 or 2)
Final approach : 0 means servo up from 1 frame behind; 1 means servo directly into lock; 2 means come back
from 1 frame in front.
This parameter determines the way the machine servos into lock. The most common method is to servo up from
1 frame behind. However, this is not suitable for some machines, which will be unable to lock by this method. If
the machine hovers between zero error and 1 frame error, try an alternate servo type. NOTE: The servo
software can make automatic changes to this value.
Slew limit (frames)
Maximum number of frames of error which will be made up by servoing rather than shuttling.
Error above this value will cause the machine to go into shuttle mode rather than servo mode.
Transport Menu Group Setup
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