Bosch CP009 User Manual download pdf (Page 138)

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Page 55

DS2020

User’s Guide

ILL. 4-18. Trigger Selection

C. Trigger Selection

1) The probe that receives the trigger signal can be selected.

2) This trigger selection method has been designed to obtain better secondary

ignition patterns of Distributorless vehicles(DLI). On some DLI cars, the

primary lines may be difficult to find.

3) Since it is very easy to find the primary lines for conventional cars with

distributor type ignition, we strongly recommend that the 'Primary signal' is

selected as the trigger. The secondary signal is not stable enough since it

fluctuates in relation to engine RPM and engine load. In this case,

DS2020

may fail in displaying the correct voltage lines.

4) To use the primary signal as the trigger, connect the scope probe with needle

to the primary side negative line of ignition coil and the other end to CH1 port

of DS2020

(these cable connections are always recommended for all

cars with distributor ignition)

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Bosch CP009 User Manual Page 138