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“Floating Ground Accidents” Are Exploding in 2025 – Why 99% of Bench Oscilloscopes (Including DOS1104) Are NOT Channel-Isolated & How to Measure Safely
— Full Review + Best Floating-Safe Setup with the HANMATEK DOS1104 110 MHz 4-Channel Beast
Google searches for “oscilloscope blew up”, “floating ground accident”, and “burned scope frontend” jumped 84% in 2025. The culprit in nearly every case? Using a standard grounded bench oscilloscope to measure floating or offline power circuits – instantly shorting hundreds of volts through the scope’s common ground.
Today we answer the #1 question we get daily:
Are the channels on the HANMATEK DOS1104 isolated?
Official answer (straight from HANMATEK Support): No – all four channels share a common ground. CH1–CH4 BNC shields, probe ground clips, and the metal chassis are all tied together – exactly like 99% of bench scopes (Rigol DS1000/2000, Siglent SDS1000X-E, Hantek, Keysight DSOX1000, etc.).
| Oscilloscope | Channel Isolation | Typical 2025 Price | Verdict |
|---|---|---|---|
| HANMATEK DOS1104 | Not isolated | under €200 | Best value 4CH 110 MHz ever |
| Rigol DS1204B | Not isolated | €549 | Same architecture |
| Siglent SDS1104X-E | Not isolated | €499 | Same architecture |
| Micsig STO1104C / TO1104 | Fully isolated | €899+ | True isolation – 3× the price |
| Cleverscope CS448 | Fully isolated | €3999 | Lab-grade isolation |
The 5 Most Common “Boom” Scenarios in 2025 (and how to stay safe with DOS1104)
| Scenario | Dangerous Move | Safe Method with DOS1104 |
|---|---|---|
| Measuring primary-side MOSFET | Clip GND to Drain | Use 100:1 high-voltage differential probe |
| Measuring 3-phase inverter | Ground two channels to different phases | Use A–B math or three differential probes |
| Measuring offline SMPS | Clip GND to live or neutral | Power DUT via isolation transformer + diff probe |
| Measuring car O2 sensor / ECU | Ground clip to chassis | 100% safe – car chassis is common ground |
| Comparing 220 V input vs 12 V output | Two grounds on different potentials | Two differential probes or isolated handheld scope |
Why the DOS1104 Is Still Our #1 Recommended 4-Channel Scope in 2025
- Real 110 MHz bandwidth + 1 GSa/s + 4 channels at only under €200 (lowest price ever)
- 7″ bright display + 50,000 wfm/s update rate (crushes everything under €500)
- FFT, math, protocol decoding (I²C, SPI, CAN, UART) built-in
- Comes with 4× genuine PP150 probes + 2-year replacement warranty
- Black Friday 2025 deal: Buy DOS1104 → get FREE SF3 stud finder (€18.73 value)
Cheapest Safe Floating Measurement Setup in 2025 (Total < €380)
- Main scope: HANMATEK DOS1104 – under €200
- Must-have: HANMATEK DP100 100:1 differential probe (700 Vpk) – €69
- Optional: Battery-powered isolation module or 1:1 isolation transformer – €20–40
This combo safely handles 99% of offline power, motor drives, and inverter testing – while costing half of a true isolated-channel scope.
Final Verdict
- 90% of your work (Arduino, automotive ECU, audio, sensors, logic)? → Buy the DOS1104 today and use it worry-free.
- Regular offline SMPS, half-bridge, inverters? → DOS1104 + one differential probe = the smartest €350 you’ll spend in 2025.
Stop being scared of “non-isolated channels” – just measure the right way.
→ Grab the hottest 110 MHz 4-channel scope of 2025 while the Black Friday bundle lasts: HANMATEK DOS1104 110 MHz 4-Channel Oscilloscope – under €200
Your power supplies, motor drives, and inverters deserve to be seen clearly – and safely.
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