Protection Features
| OCP (Normal @ 26.1°C) | 12V: 284.20A (136.44%), 11.886V* Didn’t shut down 5V: 31.1A (141.36%), 4.972V 3.3V: 31.1A (141.36%), 3.196V 5VSB: 5.6A (186.67%), 4.972V |
| OCP (Hot @ 43.5°C) | 12V: 287.20A (137.88%), 11.894V* Didn’t shut down 5V: 31.3A (142.27%), 4.945V 3.3V: 31.2A (141.82%), 3.187V 5VSB: 5.5A (183.33%), 4.971V |
| OPP (Normal @ 30.2°C) | 3232.57W (129.30%)* Didn’t shut down |
| OPP (Hot @ 44.6°C) | 2985.95W (119.44%) |
| OTP | ✓ (100°C @ Heat Sink) |
| SCP | 12V to Earth: ✓ 5V to Earth: ✓ 3.3V to Earth: ✓ 5VSB to Earth: ✓ -12V to Earth: ✓ |
| PWR_OK | Proper Operation |
| UVP (Full Load @ 90V) | ✓ |
| UVP (No Damage @ 80V) | ✓ |
| Conducted Emissions EN55032 & CISPR 32 | ✗ |
| NLO | ✓ |
| Fan Failure Protection | ✗ |
| SIP | Surge: MOV Inrush: NTC & Bypass Relay |
Testing the protection features on high-capacity units can be challenging, and this is exactly the case here. The OCP triggering points are set too high, and the same applies to OPP, so we had to abort testing because it doesn’t make sense to exceed the AC socket’s amperage limit. We are referring to a desktop PSU, not a server one. Moreover, the OCP settings on the minor rails, besides being sky-high, are also incorrectly set, as they are higher under high temperatures than at normal ones, which also doesn’t make sense. On the other hand, we did notice that OPP triggers at a reasonable level under high temperatures, while under normal temperatures, it is set too high. Lastly, a high-end and expensive PSU like this one should have fan-failure protection.
EMC Pre-Compliance at a Glance
Every electronics device, including PSUs, can be an EMI source, which, depending on the amount of EMI emitted, can affect the proper operation of nearby devices. EMI can, in some extreme cases, even render them unusable. Some standards have been established to minimize electromagnetic interference (EMI) noise. The corresponding standards for IT (Information Technology) products are CISPR 32 and its derivative, EN 55032, which applies to products sold in the EU. In the EU, every product bearing the “CE” marking must comply with the EN 55032 standard. CISPR 32 and EN 55032 standards categorize devices into two classes, A and B. B-class equipment is intended for domestic environments, so its permitted EMI emissions are significantly lower than those of A-class devices.
Our equipment for EMI readings:
- Rohde & Schwarz FPC1500 (loaded with all options)
- Tekbox TBLC08 LISN
- Tekbox TBFL1 transient limiter
- Tekbox EMCview software
| CISPR 32 / EN55032 Limits | ||
| CISRP 32 / EN 55032 Class A Conducted EMI Limit | ||
| Frequency of Emission (MHz) | Conducted Limit (dBuV) | |
| Quasi-peak | Average | |
| 0.15 – 0.50 | 79 | 66 |
| 0.50 – 30.0 | 73 | 60 |
| CISPR 32 / EN 55032 Class B Conducted EMI Limit | ||
| Frequency of Emission (MHz) | Conducted Limit (dBuV) | |
| Quasi-peak | Average | |
| 0.15 – 0.50 | 66 – 56 | 56 – 46 |
| 0.50 – 5.00 | 56 | 46 |
| 5.00 – 30.00 | 60 | 50 |
| CISRP 32 / EN 55032 Class A 10-Meter Radiated EMI Limit | ||
| Frequency of Emission (MHz) | Field Strength Limit (dBuV/m) | |
| 30 – 88 | 39 | |
| 88 – 216 | 43.5 | |
| 216 – 960 | 46.5 | |
| > 960 | 49.5 | |
| CISRP 32 / EN 55032 Class B 3-Meter Radiated EMI Limit | ||
| Frequency of Emission (MHz) | Field Strength Limit (dBuV/m) | |
| 30 – 88 | 40 | |
| 88 – 216 | 43.5 | |
| 216 – 960 | 46.0 | |
| > 960 | 54.0 | |
Please note that the ATX spec allows a 4 dB margin for conducted and radiated emissions. This means that if a PSU exceeds the limits but stays within the 4 dB margin, it meets the corresponding ATX spec requirement (8.1 Emissions).
EMI Results
The PSU’s conducted emissions are too high under low frequencies under both average and peak EMI detectors.
Is there a test planned für the FSP Mega Ti 1650W? 🙏
Yeap
Nice 🤘