Nidec DT-CHRG-735 Battery Powered Digital Stroboscope User Manual

DT-735 Battery Powered Digital Stroboscope
Operation Manual

DT-CHRG-735 Battery Powered Digital Stroboscope

Warning
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-735 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-735’s withstand harsh industrial usage. The internal rechargeable battery and 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-735 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 s automatically adjusts with flash rate
External Trigger Input: 5 V dc ~ 12 Vdc 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
Battery: Ni-MH Battery Life: 1.5 to 2 hours depending on settings
Time to Charge Battery: 5 hours to full charge
Power Requirement: 100-240 VAC 50/60 Hz
Operating temperature: 32° ­ 104°F (0 ­ 40°C)
Dimensions: 9.8 x 4.7 x 4.7″ (250 x 120 x 120 mm)
Product Weight: 2.75 lb (1.25 kg) Package Weight: 4.1 lb (1.86 kg)
Warranty: 1 Year Certification: CE, RoHS
Included Accessories: Upper and Lower Handle, AC converter charger with cable, 3 pin female M16 threaded connector

5 Commonwealth Ave
Woburn, MA 01801
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

FEATURES & FUNCTIONS

Display

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|  External trigger Input
ON| Switch on button

Note:

• Units have a 5 minute automatic shut-off. When the internal timer has expired, the strobe will stop flashing. To restart the strobe, press SIG and the cycle will repeat.
• If the product is not used for extended periods, in order to avoid battery performance degradation, charge the battery one time per month.
• The stroboscope may operate while powered by the external power supply.
• If the battery loses too much power, the displayed digits will appear to fade. Please charge the battery. When charging, the charging indicator will light up. When the battery is fully charged, the light goes off.
• In the charging process, if the charging indicator blinks, it indicates the battery was completely depleted. Charge the battery for the full 5 hours.

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.
   Rotatton of shaft (φm)| Number of flashes (φm)| Flashes/φm shaft| Number of stopped Images
   ---|---|---|---
   at 1,500 φm| 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

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:

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.

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

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

TROUBLESHOOTING

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

DIMENSIONS (mm)

SEALS USA, Inc.
Instruments Division
Test Equipment Depot – 800.517.8431 – 5 Commonwealth Ave, Woburn, MA 01801
TestEquipmentDepot.com

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