34| 8.0 LinLab - Motorized Device Configuration and Control
Software
8.3.13 Approach
The approach function is generally only used with a Scientifica
PatchStar manipulator. It allows the user to manually set an approach
angle or sense an approach angle (from the rotary sensor within the
PatchStar manipulator). Once enabled the X and Z axis will be driven
proportionally to create a virtual 4
th
axis. This allows the user to
approach the sample on the same axis as the pipette rather than
vertically in the Z axis alone.
Having the “Enable approach angle” ticked will drive the manipulator at
the value shown in the Set approach angle screen. If the user wishes to
over-ride this angle the indicator can be dragged to the desired angle
and the Auto Angle (within the PatchStar) will not be used again until the
Use Auto Angle button is re-selected again.
8.3.14 Speed
This enables the user to adjust the Maximum speed and the rate of
acceleration for computerised Point to Point moves, ie between Home
In and Home Out or Memory positions. Changes to the acceleration
setting also apply to the deceleration value. If the user experiences
resonance etc then the system can be optimized by adjusting these
settings. If the acceleration value is increased, the rate of response will
increase.
8.3.15 The Joystick / Rotary Speed scaling
The joystick/rotary speed scaling slider changes the ratio of ACC wheel
rotation (or joystick deflection) to the distance moved by a stage. Eg;
with a Speed Scaling of 100 a PatchStar manipulator would move 1.6
mm per revolution of the ACC knob in high speed. At a scaling of 200,
the manipulator would move 3.2 mm per rev. The user may also adjust
the slow speed scaling to increase or decrease the rate of motion
relative to the ACC knob rotation (or joystick deflection).
8.3.16 Acceleration / Deceleration
Is used to adjust the rate of acceleration and deceleration that is applied
when initiating or ceasing motion using the ACC or Joystick. Reducing
the value means that the device will respond more rapidly, increasing
the number induces lag.
