Power Arc ignition with Motogadget's Motoscope issues

[jueby]

Hi there,

I'm Herbert, resident of the Netherlands.
I'm building a cafe racer based on a CB650 sohc.

What I ran into recently is after installing a PowerArc ignition with multiple spark, I can't get the tach signal to communicate with the motoscope pro.
If I use the PA's tach pulse wire, which provides 1 pulse per rotation, the tach doesn't react.
If I use the motogadget's induction signal pickup, I get 3 pulses per rotation because of the multispark.
If I connect the PA's pulse wire to a different tach, that of a zxr400, that works (so the signal does its job).
I know I can set the amount of pulses for the tach with the motoscope's engine input setting. I just can't get the correct setting.

Anyone that also has these two premium brands working together, please, I could use all the help. Any ideas?

Kind regards,

Herbert

 

[jueby]

Problem is identified.

I hooked up the trigger wire from the PA module and the trigger form the induction signal pick up.
When cranking the engine you can instantly see the difference.
Both signals have a 12V strong signal.
The trigger of the PA module drops to about 2V to 3V (never hits 0V!!)
The trigger from the induction signal pick up hits 0V.

With this knowledge I came to the conclusion that this is the only difference why one signal works with the Motoscope Pro and the other doesn't.

I only need to make the trigger from the PA module hit 0V when it pulses.
I tried this with a pull down resistor. I had 3 sizes, 10 kΩ, 4,7 kΩ and 1 kΩ.
Only the 1 kΩ gives a result. The tach from the motoscope reacts to the PA module's trigger!!!!!!!!
But it seems 1 kΩ is too small so the 12V sips away and the signal never reaches the Motoscope in about 5 seconds after cranking.

But the source of the problem is identified!!! I'm closer to the solution.