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Unformatted text preview: 1 min / 000 , 18 sec / = sec / 600 , 3 pulses By what number must the number of counts in a second be multiplied to produce a result in rpm? min 1 sec 60 12 sec 1 = pulses rev pulse conversion 5 = conversion A strobe based tachometer is shining at a disk rotating at 2400 rpm. The disk has one circumferential mark for speed measurements. a. How many marks will you see if the strobe flashing rate is 1200 per minute? b. Repeat part (a) for flashing rates of 800, 2400, 4800, and 7200 flashes / min. Rotation Rate (rpm) Flash Rate (fpm) Rotations per Flash Marks Seen 2400 800 2400 / 800 = 3 1 2400 1200 2400 / 1200 = 2 1 2400 2400 2400 / 2400 = 1 1 2400 4800 2400 / 4800 = 1/2 2 2400 7200 2400 / 7200 = 1/3 3 Disk Rotation Rates Flash Rates (fpm) 2400 (rpm) 2400 (rpm) 2400 (rpm) 2400 (rpm) 2400 (rpm) 800 1200 2400 4800 7200...
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 Spring '08
 Miller

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