Checkline PK2X - Manual (Page 7)

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5.0 OPERATING FROM AC-POWER (PK2X-AC MODEL ONLY )
Plug the AC-Adapter into and appropriate AC output, selecting and installing the
appropriate plug adapter for the country of use (N. America, Europe, UK and
Australia plug-in adapter provided). Refer to Charger Set-up (Section 4.1, page6).
Plug the other end of the AC-Adapter into the DC-Input receptacle located in the
bottom of the handle on the strobe housing (refer to Section 3.1, page 4)
After inserted into the AC power outlet, the Red LED will turn on (upper left side of
the AC-Adapter housing) indicating that the AC-Adapter is powered and operating
properly. It is now possible to turn on and operate the PK2X.
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The harmonic images at 6,000 and 4,000 RPM are not singular, but double and
quadruple. A singular image does appear at 3,000 and again at 1,500 RPM.
1,500 is one half of 3,000. Therefore, the rate is 3,000 RPM.
Example 3: (Out of Range)
This final example shows how speeds faster than 12,000 RPM (the upper limit of the
Pocket-Strobe) can be calculated.
This is the object which is rotating. Its speed is known only to be
greater than 12,000 RPM. Because it has a uniform shape, an
orientation mark is added.
To determine its speed, three steps are required:
1 . Starting from the maximum speed of the strobe, slowly reduce the flash rate.
Look for singular frozen harmonic images.
2. Find at least two images. (For greater accuracy, find three). Label these rates as
“X,” “Y’ (and possibly “Z”).
3. Plug these values into a suitable equation (see page 19) and calculate the
object’s RPM.
Step 1: As the speed is reduced, the following images appear:
Image No.: 1 2 3 4
Flash Rate: 6,000 4,000 3,000 1,500
Image No: 1 2 3 4
Flash Rate: 9,600 7,200 4,800 3,600
Point “X” Point “Y” Point “Z”