Real-World Scope Tests: Coil Amp Ramps, Fuel pump test and MORE!! Do U-Scope? (Episode 2) скачать в хорошем качестве

Real-World Scope Tests: Coil Amp Ramps, Fuel pump test and MORE!! Do U-Scope? (Episode 2)

Learn practical lab-scope workflows you can use today. We reinforce the basics with real-world tests: checking primary ignition current with a low-amp probe, verifying an entire bank of coils via the common power feed, reading fuel-pump current through a fuse-loop adapter, understanding turn-on oscillations, setting up a clean crankshaft position (CKP) waveform, and using a capacitive secondary probe as a reliable cylinder-ID trigger for multi-channel captures. What you’ll learn How to amp-ramp a coil safely at the fuse box and what a “good” ramp looks like Why turn-on oscillations matter (saturation, driver health, primary circuit integrity) Fast bank-wide coil checks using the common B+ feed (no need to probe every coil one by one) Fuel pump current signatures (brush/commutator ripple, worn pump clues, cavitation hints) CKP waveform setup (timebase, trigger, coupling) and why missing/odd teeth look the way they do Using a secondary capacitive probe (Wyzeprobe) for rock-solid cylinder identification across channels Gear shown / useful links AESwave uScope handheld oscilloscope: https://www.aeswave.com AESwave Wyzeprobe (capacitive secondary probe): https://www.aeswave.com Fuse-loop current adapter (ATC/Mini add-a-fuse style) Low-amp probe (20A/60A range, 10 mV/A typical) ScannerDanner book/video resources: https://www.aeswave.com Coil primary current via fuse loop: 20A range, 10 ms/div, DC coupling, trigger on rising current; expected ~5–10 A peak, clean linear ramp, distinct turn-on oscillations just after driver turns on Common B+ feed (bank check): Clamp around common feed to multiple coils; watch for uniform peak height and ramp slope across events; a single “low peak” or missing event flags one coil/circuit Fuel pump: 20A range, 50 ms/div (idle) or 100 ms/div (under load), DC coupling; look for stable average current and consistent commutator ripple spacing; irregular spacing/low amplitude = wear CKP (VR sensor example): AC coupling, ~2–5 V scale (depends on sensor), 5 ms/div initial; center trigger; you should see uniform sine/reluctor pulses with a recognizable gap or “odd tooth” pattern Secondary (Wyzeprobe): AC coupling, 5–20 kV eq. scale (scope volts if using attenuator), 2 ms/div; use firing line for cylinder ID timing; don’t diagnose mixture from this alone—use it to sync channels Added tests to try (for next captures) Coil dwell comparison at idle vs. 2,500 rpm (watch dwell control and oscillation quality) Fuel pump loaded vs. key-on prime current comparison CKP vs. CMP correlation (overlay to verify timing without teardown) Relative compression using an amp clamp on the starter feed with the Wyzeprobe as cylinder sync Safety & tips Always place the amp loop in the fuse position feeding the circuit, not on ground returns. Zero your clamp, orient arrow with current flow, and verify scale before cranking/run. For VR CKP, start AC coupled to remove DC bias, then refine. Use the secondary probe as a sync—it’s quick and reliable, but not a full secondary analysis tool. Downloadable quick reference (copy into your shop wiki/notes) Coil peak current target, ramp slope, and oscillation presence = health snapshot Bank-wide coil check = instant outlier detection Fuel pump ripple = commutator health; average draw = pump load CKP pattern = mechanical timing & sensor health baseline Secondary probe = fast sync for multi-channel captures