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Start from the lowest setting on the strobe, and then work your way up till you find the highest setting that freezes the rotating item. This will hold for a single blade. Lower strobe settings (lower rpms) may also look correct, but you're actually catching the item at half the true rpm. The item will appear to be stopping after 1 revolution, but you're watching it after 2 revolutions every time the strobe flashes. With a two bladed propeller, you run into a similar problem, except that running the strobe twice as fast can give misleading results. It is helpful to make an identifying mark on one blade that can be easily seen when the strobe is running. Then find the highest rpm where that marking stays in the same spot. This will assure you that you aren't counting half rpm, and that you aren't counting twice rpm by watching the other blade move to the same spot.

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โˆ™ 2007-09-04 16:06:43
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Q: When using a strobe light to determine the RPM of a rotating item and you read 1000 and 2000 how do you know which is correct?
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Related Questions

How does a strobe light work?

2. A strobe light works by illuminating an object with a very brief flash of light. If this flash of light is repeated at the same rate as an object is rotating, then the rotating object will appear to be stationary. The flash of light is produced by a flash tube similar to that on a modern camera, but one capable of having a very short pulse of light, and at very great intensity. The modern Strobe light was invented by Edgerton, and he went on to invent Side Scan Sonar, a powerful technique for viewing the seabed. The primitive origin of the strobe light can be seen as a slit in a cardboard disk, which is rotation at the same speed as the object is rotating. The technique is not limited to rotating machinery - any repetitive motion may be studied. And with single flashes, a short-lived phenomena may be captured on film.

Who invented the strobe light?

I believe dr. Harold edgerton invented the strobe light.

What is the definition of strobe?

Answer=1.A Strobe is a light that flashes on and off continuously.

How much is a strobe light for Halloween decorating?

Well to determine the cost of a strobe light you would have to figure out how many lights you would like to have as well as the quality of the lighting.I have seen them range from maybe $6.99 to $20.99 or higher depending on what you want.

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When a strobe light is tuned to exactly half times RPM how many reference marks will appear?

Assuming there is one reference mark on the rotating object to start with, a strobe tuned to exactly one half times RPM will show only one reference mark, i.e. one every other revolution.

How many watts does a strobe light need?

180 per light your welcome

Can you test a strobe light bulb?

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Flash strobe spotlight snd photofloodsae all sources of?

Flash, strobe, spotlights and photofloods are all sources of Artificial Light.

What is a strobe light used for?

Strobe lights are usually used in DJ parties or disco Parties.. they are white Thunder type lights.

Where can I get a strobe light?

You must always be careful when using strobe lights, but they can be lots of fun. You can find great lighting equipment at

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"Strobe" gives plenty light intermittently.

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A flashing light with timed periodic movements.

What is the purpose of a car strobe light?

A car strobe light is used to get someones attention such as when a police officer is pulling someone over. It is also used to warn of danger or to get out of the way such as when an ambulance is hurrying by.

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What do you call the flashing white light at parties and clubs?

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Are strobe lights harmful to the eyes?

That depends on the light. Exposing your eyes to light so bright that it makes you uncomfortable can be bad for your retinas regardless of how it flashes. They can cause headaches as your brain attempts to adjust back and forth between light and dark. If you are looking directly at the strobe, then it can be.

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Two methods, one uses a dial that is held in the center of the revolving shaft and is directly read off of the dial face. The second method uses a strobe light. The light is focused on the shaft and the dial on the strobe is turned until it looks like the shaft has come to a stand still. The RPM is read off of the meter face of the strobe light.

What is it in the night sky that blinks blue red white and green?

Probably an airplane. Aircraft have red and green navigational lights on the wingtips, and a red rotating beacon on the top. Many airplanes also have a brilliant white strobe light, which could appear to be blue.

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To make the hazard lights alternating flash, a kit called a wig wag is added to the flasher system. To have actual strobe lights, then a strobe kit with its own light has to be installed.

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