Test #1 : Servo current - moving, without load



The servo was connected to the aileron channel, with centered trim. There was no load on the servo arm. The oscilloscope was set to trigger on the current waveform going higher than 280mA (28mV). After the servo settled down to center (no jitter or hunting), I quickly moved the aileron stick from center to full left (~45° servo travel). Note that the S90 appears to be faster than the 94461 and the 94141. There may be a slight error due to how fast I moved the stick, but it was consistent over several tries (see below for speed specs.)

Note that the 94461 and 94141 don't look like they're done moving before going off screen. Because the servos didn't transit in the same amount of time, I had to compromise when it came to taking the averages. The S90 was fastest, followed by the 94141 and the 94461 (I measured them, but didn't save the waveforms). If I averaged all three over the slowest servos' time, it would skew the faster ones because they'd be averaged over more time that their currents were in idle, and vice versa. So I chose a point in between the fastest and the slowest. This is why the screen shows the S90 already stopped, while the 94461 and 94141 were still in motion, but not too far behind. This same reasoning applies to Test #3 and allows us to compare it to this test directly. Opinions?


Continue to Test #2

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