Check-line DT-311D User manual

DT-311D Line Powered Digital Stroboscope
Operation Manual
Don’t look directly into the light Source. This may result in eye injury.
Don’t use or store in the following environments: Direct sunlight,
condensation, dust or caustic.
Do not alter, or modify. Such action may cause damage and void
warranty.
Operate with 0-35°C (32-95°F), 35-85% RH. Use outside of this range may
alter the unit’s performance.
The DT-311D is a portable, highly stable, industrial-quality stroboscope
for non-contact inspection and observation of moving parts by
providing the user the illusion of stopped or slowed down equipment
movement. Constructed with a rugged, metal enclosure, the DT-311D’s
withstand harsh industrial usage. The universal power range (85-240
VAC) allows one model to be utilized on various power voltages in a
multitude of countries. The included top and bottom handles aid in
portability and usage flexibility. The control adjustment settings allow
the flash rate to be readily altered by the user to visually inspect rotating
or reciprocating machinery such as gear teeth, rotors, shafts, rewinders,
printing presses, etc. all without stopping production. These features
make the DT-311D ideal for quality inspection and preventive
maintenance of automated motion equipment.
SPECIFICATIONS
Flashing Range: 60-12,000 fpm (flashes per minute) Accuracy:
±0.01% F.S.
Resolution: 0.1 from 60-6,000; 1 from 6,001-12,000 Display: 5
digits 0.4” (10 mm) height
Flashtube Power/Life: Xenon ≤ 45W / 50,000,000
Flash Duration: 10-30 μs automatically adjusts with flash rate
External Trigger Input: 5 V dc ~ 12 V dc pulse signal input
(high level trigger) from sensor
Sensor Power Supply: 12 V dc up to 50 mA
Lux Rating: 8” (20 cm) Distance = 1550 lx @ 1500 fpm, 2350 lx @
6000 fpm with 15.5” (400 mm) irradiation diameter. 20” (50 cm)
Distance = 650 lx @ 1500 fpm , 580 lx @ 6000 fpm with 23.5” (600
mm) irradiation diameter
Sensor Power Supply: 5-12 VDC up to 50 mA
Battery Life: 1.5 to 2 hours depending on settings
Time to Charge Battery: 5 hours to full charge
Power Requirement: 85-240 VAC 50/60 Hz
Operating temperature: 32° – 104°F (0 – 40°C)
Dimensions: 8.3 x 4.7 x 4.7” (210 x 120 x 120 mm)
Product Weight: 2.2 lb (1.0 kg)
Package Weight: 2.6 lb (1.2 kg)
Warranty: 1 Year
Certification: CE, RoHS
Included Accessories: Top & bottom handles, 9.8’ (3 m) power cable,
3 pin female M16 theaded connector
FEATURES & FUNCTIONS Display
FPM Flash speed indication in flashes per minute
HZ Flash speed indication in Hz
INT Operation in internal user settings mode
EXT Operation in external sensor input settings mode
Function Keys
SIG Signal selection. Press this key to switch between
internal and external signal operation
MODE Switches between Hz and FPM
+ Increases the frequency (internal trigger mode only)
- Deceases the frequency (internal trigger mode only)
×2 Multiplies the flash rate/frequency by a factor of 2
(internal trigger mode only)
÷2 Divides the flash rate/frequency by a factor of 2
(internal trigger mode only)
EXT
AC85~240V

EXT External trigger Input
ON Switch on button
2
OPERATION The Use of Internal Trigger
Turn the power on. The system enters the internal trigger mode. Turn
the encoder knob, or press the “+” “-” keys to adjust the strobe
frequency or flash speed so that detected the object appears stationary.
Use “× 2” “÷ 2” keys to make large changes to the flash frequency.
To measure true revolutions per minute (RPM) by Marking:
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. If the object has a uniform shape, such as multi blade fan or the
shaft of a motor, you should give it an identifying mark with reflective
tape or paint to distinguish its direction.
2. Turn power switch on.
3. Set flash rate to the highest value and adjust downward.
4. 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).
5. To verify RPM reading, press “÷2”; a single image should appear
again.
To measure true revolutions per minute (RPM) without Marking: This
example explains that if the object has a suitable, unique shape, then
the actual speed of the object may not need to be determined by
marking the object.
In this example, the rotation is below 7000 rpm, the following harmonic
image appears:

TROUBLESHOOTING
Harmonic images at 6000 and 4000 rpm are not a single still image, but double
and quadruple. Single image appears at 3000 and 1500 rpm. 1500 is half of
3000 and the same single image appears, therefore, the actual speed of the
object is 3000 rpm.
The Use of External Trigger
When in EXT mode: In this mode, the flash trigger signal frequency or
flash rate speed is automatically adjusted according to an external
sensor’s input signal.
Wiring of the external sensor is as follows:
1: +12 V dc up to 50 mA
2: Ground
3: Trigger signal 5 - 12 V dc
Issue Troubleshooting Methods
Unit does not work and
no display
Check the power supply is proper
Power Switch is functioning
Whether internal fuse is burn out, check
and replace
Unit does not work but
displays properly
Silicon controlled rectifier / optical coupler
(IRF840/521-1) need replacement
Strobe flashtube needs to be replaced
Check if unit is in external trigger mode
Does not flash under
external trigger mode
Check if the trigger sensors are working
properly
Flashes intermittently
Flashtube needs to be replaced
Flash but the flash is
darker or dimmer than
typical
Actual Speed
RPM
Strobe
Frequency
FPM
Multiple Number of
Still Images
3000 12,000 4 4
3000 9,000 3 3
3000 6,000 2 2
3000 3,000 1 1
3000 1,500 1/2 1
3000 1,000 1/3 1

3
DIMENSIONS (mm)