Nidec DT-725 User manual

DT-725 Digital Stroboscope/Tachometer
Operation Manual
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.
SPECIFICATIONS
Flashing Range: 40.0 - 12,500 fpm (flashes per minute)
Accuracy: ±0.02 % of reading
Resolution: 0.1 fpm: 40.0 - 4,999.9 fpm / 0.2 fpm: 5,000 - 7,999.9
fpm / 0.5 fpm: 8,000.0 - 9,999.5 fpm / 1 fpm: 10,000 - 12,5000 fpm
Phase Shift: Use +/- push buttons (360° in 6 seconds)
Display Update Time: Ext. mode : varies with flashing rate
Output Signal: NPN open collector (24 VDC max., 50 mA), 150
μsec typical
Rate Multiplier/Divider: Multiply by 2, divide by 2
External Trigger Input Signal:
a) 12 - 24 VDC thru a 3-wire NPN output sensor (requires external
power
b) 12 VDC thru a 2-wire proximity sensor (leakage current 1 mA
max., load current 8 mA min.)
c) Switch or relay contact
Display: 5 digits, 0.3” (8 mm) high, LED
Flashtube Power/Life: Xenon, 10 W max. (100 million flashes)
Flash Duration: 10 - 15 μsec
Low Battery Indicator: Flashing LED
Battery Life: 1 - 2 hours depending on flash rate
Power Requirement: 115 VAC or 220 VAC ±10 % 60/50 Hz /
Internal battery pack
Operating Temperature: 32 - 104°F ( 0 - 40°C )
Product Weight: 2.75 lbs (1.25 kg)
Package Weight: 4.45 lbs (2.02 kg)
Dimensions: 7.28” L x 4.72” W x 4.72” H (185 mm x 120 mm x
120 mm)
Warranty: 2 year
Included Accessories: AC adapter
The DT-725 portable, light weight stroboscope with rechargeable
battery possess many of the same features as the famous DT-
300 Series Stroboscopes, but are lighter in weight. Constructed of
strengthened high impact plastic, these rugged units are excep-
tionally reliable and withstand the same harsh conditions as more
expensive units. Employing its unique phase shifting feature, the DT-
725 “freezes” rotating or reciprocating machinery for visual inspec-
tion of covered gear teeth, shafts, oil/fuel/ink injector patterns, and
print media; all without stopping production.
These features make the DT-725 ideal for quality inspection and pre-
ventive maintenance of automated motion equipment. Units can be
ordered separately or as a convenient kit.
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.
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

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, press-
ing “+” will give the illusion that the object is moving towards the
opposite direction of rotation. This action increases the rate sligh-
ly (phase shift) and is used to place the object in desired position.
Minus (–) Switch: When object appears to be standing still, press-
ing “–” 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
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.
2
External Triggering
1. Connect wires according to connector pin designation: Tip: sig-
nal 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 inter-
nal mode to the external.
3. The strobe will flash every time the sensor puts out a pulse. See
specifications table for input signal requirements.
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.

3
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.
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.
FLASH TUBE REPLACEMENT
When FPM reading is displayed but unit is not flashing, flash tube
may need to be replaced.
1. Unplug line cord from power line. Turn power switch OFF. Wait a
few minutes until stroboscope is cool before replacing flash tube.
2. Remove protective window by removing the 4 screws.
3. Use a rag and pull the tube out of its socket by rocking it slightly
up and down. Do not use bare hands to remove tube, it may break
and cause injury.
4. Insert new tube using the technique mentioned above. Make
sure that the tube is placed properly in the socket otherwise it
will touch the reflector. Tube should be set symetrically within the
neck of the reflector.
5. Replace protective window.

DIMENSIONS (mm)
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