K" Constant; (Car Transmission Ratio) - Digitax F3 Plus Technical Manual

"K" Constant
(Car Transmission Ratio)
The "K Constant" is the number of pulses per Kilometer emitted by a transducer and received by a taximeter.
The pulses can be emitted by the car's electronic transducer or, if the car is not provide of it, by the Digitax
mechanical one. This constant can be knowed or be tested on road.
Follow this procedure to find out the car tansmission ratio (K‐constant).
For a right procedure it must be done in a road with a carefully marked distance of 1 Kilometer(default).
Align carefully the car's front wheels with the test distance's start line
Autotest Finishing Point
Select For Hire position.
Press K2 and K3 buttons at the same time.
The fare display shows "Attest" for a few seconds and then the
"For Hire ‐ Stopped ‐ Hired" signs light on together.
Now start driving the test distance (1 kilometer) at 30 Km/Hour
maximum.
Reach the finish line, previously marked, and stop the car:
the extras display will show the number of pulses emitted during the
test‐distance run.
Keep note of this value. The aim of it is to calibrate the taximeter to
calculate the K‐constant.
Press OP button to end the procedure and go back to For Hire position.
Take out the taximeter programming cover
Select For Hire position.
Insert the Black Programming Key in its slot.
Press K2 and K3 buttons at the same time.
The big display shows "Attest" for a few seconds.
The "For Hire ‐ Stopped ‐ Hired" signs light on together.
The fare display shows the programmed K‐Constant value.
The extras display shows the meters to be covered for the Autotest
Press K2 button to increase the pulses/km number.
Press K1 button to decrease the pulses/km number.
Referring to the above example, press K1 button till to reach 680 value
( pulses finded out in the autotest) showed in the fare display.
Press OP button to end the procedure and go back to For Hire position.
Take out the Black Programming Key from the taximeter.
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K Constant = Pulses/Kilometer
How to find out the K‐Constant value (Autotest)
1 Kilometer at Max 30 Km/Hour.
How to insert the K‐Constant value
Follow this procedure to calibrate the taximeter with a know K‐Constant value.
Autotest Starting Point
party is strictly prohibited.
Meters