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Figure 2-6. Guide number correction for repetitive flashing with a Type 1531 Stroboscope.
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TM-9-6625-2465-15 Electronic Stroboscope (General Radio Type 1531-AB STROBOTAC) 6680-892-1560 Manual
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CIRCUIT DETAILS.


PRINCIPLES
OF
OPERATION
3-1.BASIC STROBOSCOPE OPERATION.
3.1.1 WHAT IS A STROBOSCOPE
A stroboscope is a source of flashing light that can be synchronized
with any fast, repetitive motion so that a rapidly moving device seems to
stand still, or to move slowly.
To illustrate this principle, consider the following example:
Assume a white disc, with a single black dot, mounted on
the shaft of an 1800 -rpm motor.
When the disc is rotating at 1800 rpm, it is impossible for
the human eye to distinguish a single image and the dot
will appear to be a blurred continuous circle.
When illuminated by the flashing stroboscope light, syn-
chronized to flash once every revolution of the disc (when
the dot is at 3 o`clock, for example), the dot will be seen
at this position and only at this position at a rate of
1800 times each minute. Thus, the dot will appear to
"freeze" or stand still.
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