## KAB SpeedStrobe™## STROBE DESIGN THEORY
Strobes work on the principal of "freeze
motion" illusion by using a precise flashing light. A disc with incremental
markings, evenly spaced around a circle is illuminated while it is revolving.
When the rate of the flashing light matches the passing of the markings beneath
it, the motion of the disc will appear stationary. The mathematic formula that
describes this condition is: The Ratio of F
÷ RPM = N × (1 ÷ 60) With
Strobe Frequency and Platter RPM known, solving for
N: N = F ÷ RPM × 60
. Where F = Strobe Light Repetition Rate or Frequency RPM = RPM of Turntable N = Number of incremental dots, lines or other icons, evenly spaced around the disc. Example for 33.33 RPM 60 Hz: N = 60hz ÷ 33.33 = 1.800 × 60 = 108 markings. Example for 33.33 RPM 50 Hz: N = 50hz ÷ 33.33 = 1.500 × 60 = 90 markings. The two above examples apply to strict 60Hz or 50Hz illumination as with the KAB Speedstrobe illuminator. Note that older strobe discs that used neon or overhead fluorescent light will have double those markings because gas lamps flash on every half cycle and thus produce flashes at twice the line frequency
KAB SPEEDSTROBE TURNTABLE SPEED TESTER
KAB ELECTRO ACOUSTICS |