Digifobpro - Enforcement Functions
Digifobpro User Instructions - Enforcement supplement Page - 6
4Hz Speed Data
Simply na igate from the Main Menu to ‘Vehicle Unit’. Use the ‘File Viewer’ op-
tion followed by the Up or Down arrow to na igate to the required file identi-
fied by the ehicle licence number in the top left corner. Press the OK button
whilst your chosen file is displayed and select ‘4Hz Speed Data’ by using the UP
and Down arrows. Press the OK button.
N.B. You will only be able to iew 4Hz data on records where TREP 18 is in-
cluded and this is only currently a ailable from VDO Tachograph Units.
The 4Hz data is split into six records each depicting two minute periods of
dri e at 4Hz and including a braking e ent which ends in the ehicle coming to
rest. See below for details of the function of each of the on-screen controls
which can be accessed using the UP and Down arrows.
Icon Function within 4Hz Speed Trace graph
Na igates between the six 4hz data records
Na igates in the opposite direction
Zooms out one step from the current iew. Steps are; 1 second per
screen pixel and one quarter of a second per screen pixel.
Zooms one step into the current iew. Steps are; 1 second per
screen pixel and one quarter of a second per screen pixel.
Shifts to the left effecti ely mo ing back in time for the period.
Shifts to the right effecti ely mo ing forward in time for the period.
Digifobpro User Instructions - Enforcement supplement Page - 7
4Hz Speed Data continued:-
Displaying the breakdown of user defined periods in 4Hz data
When you zoom into a 4Hz data record you are able to iew the 2 minute pe-
riod at the full 4Hz granularity. If you zoom in a second time using the ‘+’ icon
the screen control icons will change and two ertical bars appear. You must
ensure that the period you would like to analyse further is as close to the mid-
dle of the screen as possible before zooming.
The left of the two bars is identified as ‘I
II
I’ and the second as ‘II
IIII
II’. By using the
left hand control icons (see fig 1.) it is possible to mo e the ertical bars to a
start point and an end point. As you mo e the ertical bars the top of the
screen displays the deceleration between the start and end points and the dis-
tance in metres that this represents. By using the ‘’ icon you can additionally
iew the speed at the start and end points and elapsed time for the period in-
clusi e of the start and end points.
Fig 1.
