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KAB SpeedStrobe™
($ 99.00) In Stock and Available at Excel Stereo now !
The most accurate speed
strobe on the market !
STROBE DESIGN THEORY
The KAB SpeedStrobe was designed to replace and improve upon older
strobe designs that relied on power line frequency. We also wanted
something that was easier to use and included the ability to actually
measure small amounts of error. Not just a go - no - go - test.
The KAB SpeedStrobe features a quartz locked illuminator with
99.99% accuracy. And since it is battery operated, it works everywhere.
No need for 50 or 60 Hz versions. The Disc is silk screen printed on
durable 20 mil PVC.
Instead of hypnotic bars, the KAB SpeedStrobe
features the actual speed numbers. In use, the desired speed is read
directly from the disc. no searching for the right band. Covers 16.66,
33.33, 45, 70.59 - 90 RPM. By timing the drift of the display over one
minute, accuracy can be measured to 0.03%
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 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. |
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