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 with 3-pin connector. The PWM control electronics almost always stand in the way of clean voltage regulation and it is also therefore not advisable to regulate PWM fans via voltage. Nevertheless, we also performed 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.
First, however, we check the maximum speed at 100% PWM to be on the safe side and compare it with the data sheet. The fan does not manage the specified data and even undercuts it significantly. Annoying, tolerance level or not.
In today’s DC test, we see that the fan, after starting at 1.8 volts, can even handle voltages of around 1.4 volts, while the fan from be quiet! requires at least 3.2 volts. In addition, all PWM fans also only achieve the maximum speed and sufficient throughput as well as static pressure when PWM-controlled.
Dwr fan does not have a stop, but always continues to rotate with at least 550 rpm (and above) with PWM control.
Start-up and shut-down behavior
The following measurement curves once again illustrate the very different behavior with DC control:
With the PWM protocol, we can also see very well the distinct start-up pulse, which was probably set so concisely for safety, but is pointless. The rest then reflects the data from the bar chart.
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