User's Manual

The Zero.B incorporates an advanced
debounce (anti-bounce) algorithm known
as the Trigger Transition Filter (TT Filter),
which is fully adjustable and can be used
to completely eliminate trigger bounce.
The TT Filter works by analysing each
trigger pull and determining whether
that trigger pull is a legitimate pull of the
trigger by the user, or one that has been
caused by the gun bouncing, in which
case the algorithm will take steps to stop
that bounce.
There are two adjustable parameters
associated with the TT Filter -
TT BAND
This parameter denes the operating
range of the TT Filter in terms of trigger
movement. The larger the TT Band, the
less the gun is able to bounce.
TT TOLERANCE
This parameter denes how strictly the
TT Filter applies its debounce rules - the
lower this value, the less the gun is able
to bounce.
USING THE TRIGGER
TRANSITION FILTERING
In order to optimise the TT Filter it is nec-
essary to have the TT Band parameter
as high as possible and the TT Toler-
ance parameter as low as possible -
1. Select the TT Band parameter.
Observe that the graphical bar rises and
falls as the trigger is pulled and released.
The actual value of the bar is displayed
in the top right of the display.
2. Set the Post-travel Trigger Stop
as required and ensure that the bar is
as close to 100% as possible when the
trigger is fully depressed against the set
screw.
3. Set the Pre-travel Trigger Set Screw
as required and ensure that the bar is as
close to 0% as possible when the trigger
is fully released against the set screw.
4. Set the Trigger Return Force Set
Screw as required, making the return
force as strong as possible without com-
promising the ‘feel’ of the pull.
5. Adjust the TT Band parameter, shown
in the bottom right of the screen, and ob-
serve the movement of the two horizontal
markers by the side of the bar. As the
TT Band is decreased these markers
move closer together, and as the TT
Band is increased these markers move
further apart. Set the TT Band such that
when the trigger is fully depressed the
bar settles above the upper marker and
when the trigger is fully released the bar
settles below the lower marker. This en-
sures that the TT Band operates across
the full range of the trigger pull
6. Select the TT Tolerance parameter.
With the gun gassed up and preferably
tted with loader and ring paint, try to
get the gun to bounce by pulling the trig-
ger very slowly. If the gun does bounce
then reduce the TT Tolerance until it
no longer does so. If the gun does not
bounce then increase the TT Tolerance
until the gun does bounce and then
reduce the TT Tolerance again until the
bouncing stops.
Whilst this set up should completely
eliminate bounce, it may result in a trig-
SETTING UP THE TT FILTER
continued ...
Advanced Set-Up
36
Advanced Set-Up
37