Shimpo DT-311A Instruction Manual

DT-311A & DT-315A Stroboscope
Operation Manual

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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)

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

display: 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

13. ( ÷2) Switch: In the internal mode, pressing “÷ 2” divides
the flashing rate by two

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

15. Input and output connector:
PIN #1: +12V

PIN #2: Synch output signal
PIN #3: Input signal

PIN #4: 0V

16. Power cord (DT-311A) / AC adapter (DT-315A)

17. Power switch

Internal Triggering Mode

To operate the stroboscope in internal triggering mode:

1. Firmly plug in power cord.

2. Turn power switch on.

3. If internal indicator is not on, press “SIG”; the INT light
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
rate to the rotational speed of the object.

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.