QEP measurement depends a lot on the quality of the sensor signals. As long as both signals have nearly 50 % duty cycle and the phase shift is near to 25 %, you can measure 10 MHz (as Charles mentioned) and even more. In contrast a bad sensor system can be inaccurate at 10 kHz and below. Ie. bearing slackness can cause significant problems, or vibrations in the range of the sensor disk resonant frequency. (Shouldn't happen at 200 rpm, but may be an issue when vibrations come from other systems.)
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