SHIMPO DT-721 - Manual (Page 2)

Operation
True RPM
Internal Triggering
1. Firmly plug power cord into a 100VAC (Japan), 120 VAC
(US) or 230 VAC (Europe) single phase.
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. Plug power cord into a 100VAC (Japan), 120 VAC (US)
or 230 VAC (Europe). 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 require-
ments.
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.
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.
Memory
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.
Rotation of shaft
(rpm)
Number of
flashes (rpm)
Flashes/
rpm shaft
Number of
stopped images
at
1,500 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