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DT-311A & DT-315A Stroboscope
Operation Manual
z
The DT-311A/DT-315A heavy duty stroboscopes, provide the il-
lusion of “stopped motion”
equipment appear to be standing still or in slow motion. The DT-
311A/DT-315A also measure rotational (RPM) or reciprocating
(strokes per minute) speeds with the same precision as an elec-
tronic digital tachometer. Ideally suited for printing inspection, mo-
tion analysis, preventive maintenance and speed measurement of
repetitive motion, DT-311A/DT-315A strobes provide timely data
on vibrating parts, leaks, spray patterns and a variety of industrial
and scientific operations the DT-311A/DT-315A stroboscopes are
extremely easy to maneuver and operate via its lightweight and
compact design and simplified user interface. Its rugged metal
construction provides unequaled reliability in the harshest envi-
ronments.
SET-UP
The DT-311A and DT-315A may be operated handheld or else
mounted on a tripod or swing armfor added convenience.
To mount the strobe on a tripod (or any other mounting surface),
use screw ¼ -20 UNC, length 0.3” (8 mm) or shorter for the tripod
screw hole on the bottom.
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 prevent getting burned, let lamp cool after use before attempting replacement.
by adjusting the strobe’s flash rate,
DT-311A
DT-315A
SPECIFICATIONS
Flashing Range: 40.0 - 35,000 fpm (flashes per minute)
Accuracy: ±0.01 % of reading
Resolution: 0.1 fpm: 40.0 - 5,000 fpm / 0.2 fpm: 5,001 - 8,000 fpm /
0.5 fpm: 8,001 - 10,000 fpm / 1 fpm: 10,001 - 35,000 fpm
Phase Shift: Use +/- push buttons (360° in 6 seconds)
Display Update Time: 0.2 sec approx
Output Signal:Synchronous, 400 μsec. Pulse output, 0 to +12
VDC amplitude(approx.), 4.7 KΩ impedance
Rate Multiplier/Divider: Multiply by 2, divide by 2
Flashing Range: Synchronous Mode: 60.0 ~ 3,000FPM / Delay
mode:200 ~ 3,000 FPM
External Mode Accuracy: ±0.01 % ±1 digit
Phase Shift: 0 to 359° with 1° resolution
Delay Time: 0 to 2,000 mSec from 40 - 10,000 fpm
External Trigger Input Signal: LO level: 0 -0.8 VDC, HI level: 2.5
- 12 VDC or open collector (NPN),pulse width 50 μsec min.
Input Impedance: 4.7 KΩ to 12 V / 6.8 KΩ to 0 V
Display: 5 digits, 0.4” (10 mm) high, LED
Flashtube Power/Life: Xenon, 10 W max. (100 million flashes)
Flash Duration: 10 to 40 μs automatically adjusts with flash rate
Lux Rating: (20 cm) Distance = 4500 lx @ 1500 fpm, 3375 lx @
6000 fpm with 4.5” (110 mm) irradiation diameter.
20” (50 cm) Distance = 1300 lx @ 1500 fpm, 930 lx @ 6000 fpm
with 10” (250 mm) irradiation diameter.
Sensor Power Supply: 12 VDC (40 mA)
Battery Life: (DT-315A)1 - 2 hours depending on flash rate
Power Requirement: DT-311A: 115 VAC or optional 220 VAC
±10 % 60/50 Hz, 30 VA (specify voltage); DT-315A: Rechargeable
Battery or AC Line Power with included AC adapter
Operating Temperature: 32 - 104°F ( 0 - 40°C )
Product Weight: DT-311A: 3.35 lbs (1.52 kg); DT-315A: 4.4 lbs (2
kg)
Package Weight: DT-311A: 4.4 lbs (2 kg), DT-315A: 5.5 lbs (2.5
kg)
Dimensions: DT-311A: 7.28” L x 4.72” W x 4.72” H (185 mm x
120 mm x 120 mm); DT-315A: 9.84” L x 4.72” W x 4.72” H (250 x
120 x 120 mm)
Warranty: 2 year
Certifications: CE
Included Accessories: Handle, flash tube removal tool. AC
Charger/Adapter (DT-315A only)
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OperationDisplay Panel
True RPM Measurement
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. Firmly plug in power cord.
3. Turn power switch on.
4. Turn setter from highest FPM downward.
1
4
2
3
5. The true RPM can be noted once the action appears frozen
and the first single image of the “mark” appears (see chart
below and accompanying diagram for further explanation).
6. To verify RPM reading, press “÷2”; a single image should
appear again.
1. LED displa
y: Displays function and value
2. EXT: External mode indicator
3. INT: Internal mode indicator
4. B-CH: Battery charge indicator (DT-315A only)
5. FPM: Flash per minute indicator
6. deg: Phase shift degree indicator
7. mSec: Millisecond delay time indicator
8. Signal switch :Switches the unit from the external mode
to the internal mode (and vice-versa)
9. Display mode switch: When unit is set to the external
mode, the strobe will switch to RPM (FPM)/deg/msec
each time “MODE” is depressed
RPM (FPM) Displays flashes per minute
External input 0-35,000 RPM (FPM)
deg Displays flash delay in degrees
msec Displays flash delay in msec
10. Setter: Changes the flashing rate
11. (x2) Switch: In the internal mode, pressing “x2”
doubles the flashing rate
Shaft Rotation Flashes Flashes/ Stopped
(RPM) (RPM) RPM Shaft Images
6,000 4 times 4
4,500 3 times 3
At 1,500 RPM
3,000 2 times 2
1,500 1 time 1
750 1/2 time 1
500 1/3 time 1
12. (+) Switch: In the internal mode, when object appears
to be standing still, pressing “+” will give the illusion
that the object is moving towards the rotating direction
at a speed of 1 rotation in 6 seconds
Internal Triggering Mode
To operate the stroboscope in internal triggering mode:
1. Firmly plug in power cord.
13. ( ÷2) Switch: In the internal mode, pressing “÷ 2” divides
the flashing rate by two
2. Turn power switch on.
3. If internal indicator is not on, press “SIG”; the INT light
14. (-) Switch: In the internal mode, when object appears
to be standing still, pressing “-“ will give the illusion
that the object is moving in reverse at a speed of 1 rotation
in 6 seconds
will then turn on.
4. Aim light beam at object under observation. The optimal
distance between the strobe and moving object is
approximately 2 feet.
5. Measure RPM by turning the setter to adjust the flashing
15. Input and output connector:
rate to the rotational speed of the object.
PIN #1: +12V
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PIN #2: Synch output signal
PIN #3: Input signal
PIN #4: 0V
16. Power cord (DT-311A) / AC adapter (DT-315A)
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NOTE: To achieve a particular rate quickly, use the “x2” or
“÷2” switches and then the setter for fine tuning.
NOTE: Once the internal timer has expired, the strobe will stop
flashing and the display will flash rapidly. To restart the strobe,
turn power switch off, then on, and the cycle will repeat.
17. Power switch
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Operation
External Triggering Mode
To operate the stroboscope in external triggering mode:
1. Connect external trigger or sensor wires according to
connector pin designation:
1 +12V (for powering sensor)
2 Synch output signal
3 External input signal
4 0V (common)
2. Firmly plug in power cord.
3. Turn power switch on.
4. If INT lamp is on, press “SIG” until EXT lamp turns on.
5. Press “MODE” to select proper mode:
FPM Light will flash in correspondence with input signal;
the input signal will be calculated into FPM and
displayed.
deg One cycle of input signal is 360°. A delayed angle
will be displayed from 0 up to 359°. (The delayed
angle can be changed by turning the knob setting as
previously described).
msec The above delayed angle will be displayed in msec.
NOTE: If the input signal frequency exceeds upper or lower
limits, the alarm dashes (-----) will be displayed and the strobe
will stop flashing.
NOTE: Once the internal timer has expired, the strobe will stop
flashing and the display will flash rapidly. To restart the strobe,
turn power switch off, then on, and the cycle will repeat.
Memory
The following parameters are set at the factory:
• Decimal point: autorange
• Internal timer: continuous
• External trigger edge: L-H (Lo to Hi)
These parameters can be changed in the field to facilitate different
situations. To change any of the above parameters, follow these steps:
1. Turn power on.
2. Make sure that INT lamp is on. If not, press “SIG” until it
turns on.
3. Change the desired memory parameter:
a. To change the decimal point
Press “÷2” and “-“ at the same time for approximately
2 seconds until display alternates between —1— and
0.0. Press “+”. The display will freeze and show 0.0.
Change decimal point accordingly by pressing “+”. If
0.0 is selected the decimal point is in the autorange
mode. If 0 is selected the decimal point is eliminated
throughout the entire range.
b. To change the internal timer
Press MODE. The display will alternate between
—2— and 0; press “+”. The display will freeze to 0.
Use the setter to set timer anywhere between 1 and 120
minutes.
c. To change the trigger edge or the external mode
Press MODE. The display will alternate between
—3— and L-H. The external trigger edge is set from
the factory to occur during the positive transition of the
incoming pulse. T o change it to the negative transition,
press “+”. Display will change from L-H to H-L.
4. Press “SIG” to go back to normal operation.
NOTE: the above settings can be checked quickly by performing
steps A to C as described above and then pressing “SIG”.
Synchronous Output Signal
For triggering and controlling additional stroboscopes, the
synchronous output signal appears on pin #2 (see below).
Battery Charge (DT-315A Only)
If battery is low , “LLLLL” is displayed and display will eventually
disappear. Charge battery as follows:
1. Turn power off.
2. Insert AC adapter/charger plug into the strobe receptacle
(CAUTION: charge the unit only with the provided AC
adapter/charger).
3. B-CH lamp will be lit during battery charge; within 2 hours
the battery should be charged completely.
NOTE: The adapter/charger may be used as a power supply to
power the strobe continuously.
Battery R eplacement (DT-315A Only)
FPM Display Mode
If the input signal exceeds 585Hz, the upper dashes on the digital
display will be flashing:
----- upper dashes
If the input signal is lower than 0.67Hz, the lower dashes on the
digital display will be flashing:
----- lower dashes
Deg/msec Display Mode
If the input signal exceeds 167Hz, the upper dashes on the digital
display will be flashing:
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If the input signal is lower than 0.67Hz, the lower dashes on the
digital display will be flashing:
(deg) ----- upper dashes ----- (msec)
(deg) ----- lower dashes ----- (msec)
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The life of the built-in battery should last for approximately 300
charges. If the time period between recharges becomes
increasingly shorter, then replace battery with a new one.
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.
2. Turn power switch off (wait a few minutes until
stroboscope is cool before proceeding).
3. Remove protective window by removing the 4 screws.
4. Use tube removing tool provided: insert tool all the way
and turn clockwise until tool locks. Pull out tube.
5. Install new flash tube using the removing tool.
6. Replace protective window.
7. Mount reflector in the center so that the reflector will not
interfere with the screw spacer on the corners.
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Troubleshooting
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, no flash:
• Check flash tube. Replace if necessary
• Check for damaged wiring and/or loose pin connections
Dimensions
Stroboscope is in internal trigger mode, no flash:
• Check flash tube. Replace if necessary
• Check for damaged wiring and/or loose pin connections
DT-311A DT-315A
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