Checkline DT-900 - Manual (Page 5)

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3.0 M EASURING RPM
DT-900 Stroboscopes are DUAL function instruments that give the operator the illu-
sion of “stopped motion” when in actuality the equipment under observation is in a
moving state. By adjusting the flash rate, equipment in motion appears to be standing
still. With a slight adjustment, movement can be viewed in apparent slow motion,
which enables the operator or observer to study the process in action. All Electromatic
stroboscopes can also measure rotational (RPM) or reciprocating (strokes per minute)
speeds with the same high precision as with an electronic digital tachometer.
3.1 To measure true revolutions per minute (RPM)
1. “Mark” the object to be measured by either visually noting an inherent
distinguishing characteristic (such as a label, scratch, etc.) or physically
marking the object with a small piece of tape, pencil mark, etc.
2. Turn power switch on.
3. Aim the light beam at the object under observation.
NOTE: The optimal distance between strobe and moving object is
approximately 2 feet.
4. Adjust flash rate from highest Flash Per Minute (FPM ) downward.
5. The true RPM can be noted once the action appears frozen and the first
single image of the “mark” appears (see diagram below for further
explanation).
6. To verify RPM reading, press ÷2. A single image should appear again.
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7.0 T ROUBLESHOOTING
FPM reading is displayed but unit is not flashing:
Flash tube may need to be replaced (See flash tube replacement section)
Stroboscope is in external trigger mode, with no flash:
• Check flash tube.
• Check sensor.
• Check wire continuity.
• Check phono connector wiring for a possible loose connection.
Stroboscope is in internal trigger mode, no flash:
• Check flash tube.
• Check battery and recharge if needed.
Stroboscope will not turn on completely
• Check battery, it may need to be charged.
• The DT-900 may have reached its Max. Flash Rate, triggering the auto shutoff
feature. The DT- 900 will shutoff after 60 seconds if no buttons are pressed,
or the dial knob is not turned.
If the Max Flash rate is reached, allow a couple
of minutes to make adjustments.
• Allow the unit to cool down if unit turns off due to high flash rate and
continuous operation.
Red LED flashing from Battery while charging
• Continue charging, the battery has been drained below its safe charging level.
• Observe the LED indicator, it should stop flashing after a couple of minutes if
flashing does not stop charger can not recover battery by trickle charging. A
replacement is needed.
IMPORTANT: Remove battery pack prior to charging.
IF, AFTER PERFORMING THE ABOVE PROCEDURES, THE DT-900 IS STILL
NOT WORKING, CONTACT ELECTROMATIC FOR SERVICE INFORMATION.