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6. Engine-speed measurement (ETT 6.22 only)
6.1 Connecting the sensors to the exhaust-gas analyser
On the side of the unit are 3 plug-in sockets. The sensors for
measuring the engine-speed are connected to the plug-in sok-
kets 23 and 24.
– Inductive trigger clamp-on pickup
Part number 1 687 224 842, 6 m
Connect to plug-in socket (23).
– Connecting cable to terminal 1, TD/TN, EST, B- or vehicle
earthing-point. Part number 1 684 460 178
Connect to plug-in socket (24).
6.2 Performing engine-speed measurement
Always switch off the engine and ignition before car-
rying out any type of work on the ignition system.
– Connect terminal B- of connecting cable to the negati-
ve battery (-) terminal or to an vehicle earthing-point.
This connection must always be made, even if the
measurement is being taken using the trigger clamp-on
pickup. It is possible when connecting the trigger
clamp-on pickup that physical injury and/or damage to
property may arise due to flashover if the ignition
system is faulty. For this reason, always connect an
earthing lead before operating the exhaust-gas analyser.
– Clip the trigger clamp-on pickup on the spark-plug cable on
which the measuring point is most easily accessible
or
– pick off the engine-speed signal at the most accessible measu-
ring point using the banana plug of the connecting cable.
6.3 Setting the number of pulses
The number of pulses is set in the user menu (see section 5.2)
under the submenu option PUL5E.
P U L 5 E
. . .
– Start setting the number of pulses by pressing the E key (5).
The number of pulses currently set flashes on the display.
l n
-
0 1 1 1 1 1
0
- - -
The number of pulses is increased by 1 each time you press the
key (4).
You can set the number of pulses to between 1 and 16 pulses per
720° rotation of the crankshaft.
Possible pulse rates are: 1, 2, 3, 4, 5, 6, 8, 10, 12 and 16.
When the maximum value of 16 is reached, pressing the
will take you back to 1 again.
– Set the necessary number of pulses (see section 6.3.1) by
pressing the
key (4).
– Press the E key (5) to return to the user menu.
key (4)
15
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