E Diagnostics quick reference
Dispense to Waste task parameters
254 Bravo Platform User Guide
Related information
Dynamic tip retraction
(mm/µL)
The rate at which to raise the pipette head during
the Dispense to Waste task.
Use dynamic tip retraction to prevent spills as the
pipette tips displace the liquid.
To move the pipettes:
• At the same rate as the volume change.
Calculate dynamic tip retraction (DTR) as
follows:
DTR = (well depth)/(well vol) = 1/A, where A is
the cross-sectional area of a well with straight
walls
• Faster than the volume change.
DTR > 1/A
• Slower than the volume change.
DTR < 1/A
The starting and ending positions can be
calculated as follows:
(V
dispensed
* DTR) + Distance
well bottom
Perform tip touch on North/
East side
The option to touch the tip on an outer side of the
adjacent northeast chimney or wall in the Tip
Wash Station after performing the dispense.
Tip touch retract distance
(–20 to 50 mm)
The vertical distance for the pipette tips to rise
before performing the tip touch.
Tip touch horizontal offset
(–5 to 5 mm)
The horizontal distance the tips move. The value
is based on the well diameter specified by the
labware definition.
For example, if you set a value of:
• 0, the tips move a horizontal distance equal to
the well radius
• > 0, the tips attempt to move past the well
radius, which results in a more forceful tip
touch
• < 0, the tips move a distance less than the
radius of the well, resulting in a lighter tip
touch
Parameter Description
For information about… See…
Opening Diagnostics “Opening Bravo Diagnostics” on page 24
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