RR400/420 User Manual - CRISARTECH
Firmware version 190122 - © CRISARTECH 2019 - Page 14 / 29
This page help to compare all th
e wheel “sensors”, the distance calculated for each wheel,
the GPS distance calculated and Trip1, based on the configuration and the above distances
In case the timer is connected to wheel speed sensor (s), first check that each pulse increments the counter of
the rotating wheel.
At the end of the installation, before calibration, carry out
a test by accelerating progressively up to the
maximum speed
of the vehicle. The displayed speed must be stable (even if it is false because not yet calibrated).
If this is not the case, the speed sensor(s) are incorrectly adjusted:
-
if the speed tends to fall to 0 beyond a certain speed, the sensor misses tops at high speed, it must be too far
from the "target" or "target" is not of good "ferromagnetic quality",
-
if the speed tends to double at certain times, the sensor records "rebounds". This can happen with ILS sensors
when they are too close to a very powerful magnet. Or problems of false contacts
5.3 Calibration
Once measurement configuration has been chosen (GPS, OBDII, or sensor), it is necessary to calibrate for your
device measures the distances precisely, but especially in the same way as that of the organizer. The RR400 uses a
very precise calibration coefficient. Or rather several coefficients:
-
calibration coefficient when the measurement is made by GPS (the value is about 1),
-
calibration coefficient when the measurement is made by the OBDII socket (the value is about 1),
-
3 calibration coefficients when the measurement is made by the wheel speed sensor (the value corresponds to
the distance of a sensor top, ie the perimeter of the wheel divided by the number of tops per revolution), one
coefficient for each tyre type (A, B or C),
-
calibration coefficient when the speed is simulated (the value is about 1).
But this coefficient is then used to measure ALL distances (Trip1 to Trip3, and Totalizer)
On the calibration page, select the calibration
mode
:
-
Trip1
uses the first counter to perform the calibration. This is the default mode, the simplest,
-
Trip2
uses the second counter to perform the calibration. Used to calibrate (or refine calibration) during the
first ZR. In this case the Trip1 was used and adjusted during the ZR, so not usable to calibrate. Trip2, on the
other hand, has not been modified and can be used to calibrate at the end of ZR, using the theoretical distance
written on the road-book. The advantage is to have a distance generally longer than the calibration zone and
taking into account the cut curves (driving style),
-
Free calcul
: here only the function of "special calculator
with rule of proportionality " is used: calculation of
the calibration from a distance that has been measured before and the corresponding theoretical distance,
-
GPS
: to perform a
rapid calibration
of the speed sensors, we use the GPS speed. This method does not have
the precision required to perform a rally, but allows a quick calibration after the sensor test. This allows you to
have a correct speed displayed in the main page without needing to go on a calibration zone, but
does not
replace in any case a real calibration at the beginning of the rally
.
Typical case of Trip1:
-
drive to the the beginning of the calibration zone,
-
press button "0.000"
-
drive to the end of calibration zone, the distance is displayed in the left field,
-
enter the zone theoretical distance in the right field,
-
then press the "
Compute
" button: the new value is displayed next to it.
