2.5.6.5Tachometer Master Gauge
2.5.6.5.1 Tolerance
The Tachometer indication must be within ± 2% of full scale with nominal voltage applied at temperature of 24 ± 3° C. [SAE
J1399].
2.5.6.5.2 Tachometer Gauge Operation
The Master gauge receives the engine speed information either via CAN-Bus or via one of two frequency inputs. During confi-
guration the source of the engine speed information has to be defined. The input signal is first converted into a physical engi-
ne speed value. The micro-controller calculates the deflection angle of the Tachometer.
2.5.6.5.3 Specification of the hourmeter
The standard Tachometer version of the Master gauge contains an Hourmeter. It can be also configured with the WINgauge
that also the Speedometer can contain an Hourmeter.
U
Legal demands are to fulfil!
a. Information comes from CAN-Bus Interfaces (one of two):
For the Hourmeter indication it must be ensured that a ECU is broadcasting this information on the CAN-Bus. If no signal is
received only dashes will be indicated.
b. Total hours information generated by master gauge:
The Hourmeter counts the number of engine hours, when the engine speed exceeds a threshold value configurable via
WINgauge (default value 300 rpm). If the engine speed is below the threshold value the hour counting stops (total and trip).
The last value willI be stored within 10 sec in EEPROM after the ignition is turned off, then counting stops, no matter if the en-
gine is running or not.
The time indication is 5 sec with nominal voltage supplied at 25 degrees C and 10 sec with nominal voltage
supplied over the full operating temperature range.
The total hour information is backed-up in EEPROM every 7.5 minutes. A special 16-word-ring-counter algorithm is applied to
recover total hours in case battery had been disconnected.
2. Functional Specification
Product Manual
Technische Änderungen vorbehalten Technical details subject to change
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