00:00Dead power stage on bench. No gate drive, shorted MOSFET, blown buck converter.
00:06Bench scope too big or too pricey. Hunted down cheap scopes with actual chops to catch dead PWM
00:13signals and fried FETs without burning cash. First, AlienTek MT1. 5590. Combined scope,
00:22component tester, signal generator. Screen tiny, but built-in ESR meter identifies shorted
00:28switching FETs instantly. Generates test PWM pulses too. Great field grab for under 60 bucks.
00:37Second, ZOII ZT703S. 7826. Best raw specs here. 50 MHz bandwidth, 280 MHz samples per second.
00:50Catches ring, overshoot, rise times on high-speed gate drivers dead scopes miss.
00:55Save waveforms directly to storage. Prograde utility meter body. Third, NERSI DSOTC-4 upgrade.
01:068825. 10 MHz bandwidth, 48 MHz samples. Solid autoset detects switching frequencies immediately.
01:15Built-in USB charging diagnostics test current draw from suspicious power rails.
01:20Worth extra cash if dual-purpose bench work needed. Fourth, AA98ZT702S.
01:296360. Cheaper sibling to 703S. Retains 50 MHz bandwidth, high sample rate.
01:37Nails fast rise times on dead VRM phases. Build quality drops slightly, 4.6 rating shows it.
01:44Value pick for purely catching fast transients on budget. Fifth, base FNERSI DSOTC-4.
01:546299. 10 MHz analog front-end, 48 MHz samples. Includes fast continuity buzzer alongside basic
02:03transistor tester. Great dedicated tool for finding direct short-to-ground MOSFETs,
02:08then immediately scoping PWM input pin. Links for all scopes below in description.
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