Shimpo Instruments DT-725 Instruction Manual
DigitalDigital
Digital
DigitalDigital
Stroboscope/TStroboscope/T
Stroboscope/T
Stroboscope/TStroboscope/T
Model DTModel DT
Model DT
Model DTModel DT
-725-725
-725
-725-725
achometerachometer
achometer
achometerachometer
Operational Precautions
! Do not operate or store instrument in the following
places:
Explosive areas
Near water, oil, dust or chemicals
Areas where temperature is above 104°F (40°C).
! Do not look at the emitted light for long periods of
time; it can be harmful to the eyes.
! Do not disassemble or repair unit while in operation.
! To mount the strobe on a tripod (or any other
mounting surface), use screw 1/4 - 20unc, length
8mm or shorter , for the tripod screw hole on the bottom.
Instruction ManualInstruction Manual
Instruction Manual
Instruction ManualInstruction Manual
Features
Setter
The setter changes the flashing rate. Turn CW to
increase the rate, turn CCW to decrease rate.
x2 Switch
Pressing "x2" will double and display the flashing rate.
1/2 Switch
Pressing the "1/2" will divide flashing rate by two and
display it.
Plus (+) Switch
When object appears to be standing still, pressing "+"
will give the illusion that the object is moving towards
the opposite direction of rotation. This action increases
the rate slightly (phase shift) and is used to place the
object in desired position.
Minus (–) Switch
When object appears to be standing still, pressing "–"
will give the illusion that the object is moving towards
the rotating direction. This action decreases the rate
slightly (phase shif) and is used for the same reason as
above.
Input and Output Connectors
Phonejack (3.5 mm)
Tip: Signal
Sleeve: GND
Power switch with lock option
Operation
Memory
Internal Triggering
1. Charge battery for approx. 15 hrs. before using strobe
for the first time.
2. Aim light beam at object under observation. The best
distance between the strobe and moving object is
approximately 2 ft.
3. Measure rpm by turning setter. Turn setter to adjust the
flashing rate to the rotational speed of the object. To
reach the desired rate faster, use the 1/2 or x2 switches.
External Triggering
1. Connect wires according to connector pin designation:
Tip: signal
Sleeve: Gnd
2. Pull power trigger switch and lock it. When the ext.
phone jack is inserted in unit, the strobe automatically
switches from the internal mode to the external.
3. The strobe will flash every time the sensor puts out a
pulse. See specifications table for input signal requirements.
When the strobe is turned off and on again at a later time, it
will start to flash at the previous displayed rate regardless if
the setter has been moved or not.
True RPM
All strobes give the illusion of stopped motion when flashing
in submultiples of the true speed.
To obtain the correct rpm, turn knob from highest fpm
downward. When the first single image appears, read the
true rpm. To verify it, press "1/2". A single image will appear
again.
4. If the input signal frequency exceeds upper or lower
limits, the alarm mark will be displayed and the strobe
will stop flashing.
Synchronous Output Signal
The Synchronous output signal appears on the tip of the
output phonejack.
See table for more information.
Rotation of shaft
(rpm)
at
1,500 rpm
Number of
flashes (rpm)
6,000 4 times 4
4,500 3 times 3
3,000 2 times 2
1,500 1 times 1
750 1/2 times 1
500 1/3 times 1
Flashes/
rpm shaft
Number of
stopped images
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