Protection Features & EMI
| OCP (Normal @ 30.6°C) | 12V: 119.20A (136.23%), 12.010V 5V: 26.5A (132.50%), 5.062V 3.3V: 30.4A (152.00%), 3.328V 5VSB: 4.6A (153.33%), 4.977V |
| OCP (Hot @ 45.4°C) | 12V: 114.60A (130.97%), 12.029V 5V: 28.2A (141.00%), 5.053V 3.3V: 30.1A (150.50%), 3.323V 5VSB: 4.4A (146.67%), 4.977V |
| OPP (Normal @ 27.6°C) | 1413.08W (134.58%) |
| OPP (Hot @ 44.5°C) | 1353.59W (128.91%) |
| OTP | ✓ (100°C @ Secondary Side) |
| 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 |
The 12V rail’s OCP triggering points are set correctly, with a notable difference between normal and hot conditions. I cannot say the same for the 5V rail, which, like in the 1200W unit, has a higher triggering point at high temperatures. This is, of course, incorrect, since the PSU experiences more stress at high temperatures. Moreover, the 3.3V rail’s triggering points are set sky-high, and they are also very close under normal and hot temperatures. Thankfully, the over power protection is appropriately set. The rest of the essential protection features are present, except for fan failure, which is not typically found in most desktop power supplies (unfortunately).
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 EMI noise. The corresponding standards for IT (Information Technology) products are CISPR 32 and its derivative EN 55032, which is for products sold in the EU. In the EU, every product featuring the “CE” marking has to comply with the EN 55032 standard. CISPR 32 and EN 55032 standards divide devices into two classes, A and B. B-class equipment is for domestic environments, so their permitted EMI emissions are significantly lower than for 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 in control.
Thanks for a review crmaris. Will you be doing a review of PCCooler YS1000?
I think I have them too somewhere 🙂