Rev
Counter Tacho Signal Information
MBE
Systems, The Elliott Centre Love Lane Ind. Est., Cirencester, GL7 1YS,
England
Tel General: +44 1285 883030 Fax: +44 1285 883020
info@mbesystems.com www.mbesystems.com
4
Cylinder Tacho Signal (Open Collector with 12v Pullup)
Tacho
Signal can source about 14mA
IMPORTANT
NOTE
In some instances we have seen tachos such as VDO, although supposed to
run on this signal, appear to drag the output voltage of the tacho signal
down to approx. 3 volts. On some occasions this has been overcome by fitting
a 390 ohm (1 watt) resistor across the tacho signal wire on the tacho
and its 12V supply wire.