Start-up and shut-down voltage
This chapter should be read with caution and attention as long as the fans are not purely analog, i.e. DC-controlled fans with 3-pin connection. The PWM control electronics almost always stand in the way of clean voltage regulation and it is therefore also not advisable to regulate PWM fans via voltage. Nevertheless, we have also carried out this measurement for all models, regardless of whether they are DC or PWM fans, because even strange results say a lot about the control electronics and the use as a DC-controlled fan.
Our new 140mm reference will therefore be a deliberately chosen DC fan and not a PWM fan. But first we check the maximum speed at 100% PWM and compare it with the datasheet. The Noctua fan manages a precision landing here! So the technical data is almost exactly right on the revolution/minute.
In today’s test we see that Noctua’s fan starts up at around 4.6 volts and stops again at around 4.2 volts. That’s a pretty decent value for such a large fan.
The fan starts at about 381 rpm and then quickly climbs well above 400 rpm. If the voltage is then reduced again, the fan stops at approx. 470 rpm. The manufacturer’s specification is clearly exceeded here, hats off, that fits so. This means that we can also test this fan stably in the usual 500 rpm setting, which is one of the requirements for the speaker.
Start-up and start-up behaviour with DC control
The following measurement curves once again illustrate the behaviour of the tested fan:
- 1 - Einführung, Testmuster und technische Daten
- 2 - Testaufbau, Messkammer und Equipment
- 3 - Anlaufspannung und Drehzahlen
- 4 - Volumenstrom (Airflow)
- 5 - Statischer Druck
- 6 - Geräuschemission Gehäuselüfter
- 7 - Geräuschemission auf 25 mm Radiator
- 8 - Geräuschemission auf 45 mm Radiator
- 9 - Geräuschemission auf 60 mm Radiator
- 10 - Zusammenfassung und Fazit
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