Hello Nick and sorry for my late reply
Using the Mixmaster I would not use channel D for an input, could you try the method below?
1. Connect the BNC channel A cable from the Mixmaster to the scope's Channel A
2. Connect an ignition pick up lead to BANK “A” No.1 on the Mixmaster and number 1 HT lead. (This will be your trigger)
3. Connect the remainder of your ignition pick up leads to the relevant cylinders and to BANK “A” BNC sockets 2 to 6 if measuring up to 6 cylinders.
4. Ensure the Bank select switch is set to “A” only
5. Use the pre-set as described above but increase your time base to 20 ms/div
6. Drag your trigger icon (Yellow Diamond) to the left of the scope screen to view all firing events on one screen
7. The trigger is set only for channel A only as channel D is not used and so the option will not be available
8. Run the scope and the engine and you should now see up to 6 x ignition events on channel “A” only, with the trigger on number 1 cylinder and the remainder following on from left to right in the vehicle firing order.
Regarding “how do I know which is #1 since the yellow diamond is moveable, i.e. during playback the yellow diamond seems to stay on the left side of the screen”
When reviewing waveforms in the buffer, they are displayed exactly how they were captured and displayed on screen. The trigger icon will still be identified on the waveform in the buffer in the form of a “greyed out” diamond. Once you identify the ignition signal containing the diamond (trigger) you will have identified number 1 ignition event and again, continue from left to right after the trigger in the vehicle firing order to identify the remaining ignition events
I can only see three waveforms on the PICO screen. What do I have to adjust in order to see all?
If you have the Mixmaster connected as above using Bank A only, connected to Channel A on your scope with the Bank select switch set to A only, then all ignition pick up leads connected to the Mixmaster should be displayed in a parade formation on channel A.
Can you check your time base is set to 20 ms/div (200ms across the screen)?
Can you ensure your ignition pick up leads are connected correctly and in good order?
Can you confirm the Mixmaster is earthed correctly at the front panel?
Can you confirm the Mixmaster battery is in good working order?
Does the vehicle misfire because of a HT fault-hence no ignition event on screen?
I hope this helps but please feedback if not