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.
But first, to be on the safe side, we check the maximum speed at 100% PWM and compare it with the datasheet. The fan easily manages the specified data and even exceeds it significantly. An inquiry with the manufacturer revealed that this was known and also wanted. Very well.
In today’s DC test, we see that once the fan has started up, it can handle low voltages starting at around 3 volts, while Noctua’s fan requires at least 4.6 volts. In addition, all PWM fans achieve maximum speed and sufficient throughput as well as static pressure only when PWM-controlled.
While the starting speed is higher than the reference, the minimum speed is significantly lower. So the plain bearing can’t be that bad. The 181 rpm is an outstanding value, although rather useless in practice.
Start-up and shut-down behaviour
The following measurement curves once again illustrate the very different behaviour. Let’s look at DC control first. Here the 181 rpm minimum speed is reached at approx. 3 volts, which is even below the values of the data sheet. Below that comes fan-stopping, which is marketed as semi-passive mode.
With the PWM protocol, we can also see very well the distinct start-up pulse, which was set so concisely for safety and which is also pleasing in this form. The rest then reflects the data from the bar chart.
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