MRC DT-2279 User manual

Digital synthesis, Hight intensity light, External trigger
Metal housing case, professional and long life
DIGITAL STROBOSCOPE XENON
Model : DT-2279
Your purchase of this STROBOSCOPE marks a step forward for you into
the field of precision measurement. Although this Meter is a complex
and delicate instrument, its durable structure developed. Please read the
following instructions carefully and always keep this manual within easy
reach.
OPERATION MANUAL
3, Hagavish st. Israel 58817 Tel: [phone], Fax: [phone] [email protected]
MRC. 5.19

Warning !
Do not look directly at strobe/reflector. Light pulses
at the frequency greater than 5 Hz may cause
photosensitive epilepsy in some individuals if directly
viewed.
A feature of the instrument is to make moving objects
appear to be stationary. Precaution should therefore
be taken to ensure that there is no physical contact
made with objects being viewed.

Caution Symbol
Caution :
* Risk of electric shock !
Caution :
* Do not use fingers or any tool
to touch the FLASH TUBE.
* The instrument contains no user
serviceable parts and should not
be opened by the user.
* Repair or after service should be
done by a qualified technician
only.
* Power plug should apply the correct
ACV power voltage
* Operating duty cycle should be
adhered to.
* Cleaning - Only use the dry cloth to
clean the plastic case !
Environmental Condition
* Comply with EN61010
Transient overvoltage at Mains Supply 2500V
*
Pollution Degree 2.
* Altitude up to 2000 meters.
* Indoor use.
* Relative humidity 80% max.

TABLE OF CONTENTS
1
FEATURES.....................................................................................................................
1
2
SPECIFICATIONS.................................................................................................
2
3
FRONT PANEL DESCRIPTION.............................................................................................
6
4. STROBOSCOPE MEASURING PROCEDURES.......................................................
8
4-1 Preparation and operating consideration...............................................
8
4-2 Checking Speed (RPM/FPM) -Internal signal MODE..............................................................................
9
4-3 Checking Speed (RPM/deg/ms) -External signal MODE ...................................................................................................
11
4-4 Synchronous signal output ...................................................................................................
12
4-5 Checking Motion...................................................................................................
12
5. FLASH TUBE REPLACEMENT............................................................................................
13
6
THE ADDRESS OF AFTER SERVICE CENTER........................................................
14

1. FEATURES
*
The Digital Stroboscope is used the microprocessor
circuit design, high accuracy, digital readout, light duty,
that is ideal for inspecting and measuring the speed of
moving gears, fans, centrifuges, pumps, motors and
other equipment used in general industrial
maintenance, production, quality control, laboratories
and as well as for schools and colleges for
demonstrating strobe action.
* Digital synthesis circuit, high stability and high adjusting
resolution, easy operation.
* Crystal time base to offer high accuracy measurement &
fast measuring time.
* Metal housing case.
* Xenon flash tube, high intensity.
*Wide range : 50 to 35,000 RPM.
* Adjustment resolution : 0.1 RPM ( < 1,000 RPM ),
1 RPM ( 1,000~9999 RPM ). 10 RPM ( ≧10000 RPM ).
* High intensity light.
*External signal trigger and Synchronous signal output .
* Setting buttons : Digital adjust konb, MODE, Int./Ext.
x 2 button,÷ 2 button, + button, - button, easy operating.
* Xenon flash tube with plug and socket, easy to make
the tube replacement.
* Compact and heavy duty housing case.
1

2. SPECIFICATIONS
2-1 General Specification
Display 5 digits ( 0 to 99999 ) LCD display.
Flash adjust 50 to 35,000 RPM/FPM.
range
* FPM : flash per minute.
Resolution 0.1 RPM : < 1,000 RPM. 1 RPM : 1,000~9999 RPM
10 RPM : ≧10000 ~ 35000RPM.
Function
Digital rotate knob, MODE, int/Ext. Select,
buttons x 2 button, ÷ 2 button, + button, - button,
Accuracy ± (0.05 % reading, + 2d)
* Spec. tested under the environment
RF Field Strength less than 3 V/M &
frequency less than the 30 MHz only.
Power Supply
110 Vac ± 10%, 50/60 Hz.
or
220 Vac ± 10%, 50/60 Hz.
or
230 Vac ± 10%, 50/60 Hz.
* A " Voltage rating label "
is affixed under the bottom
case to show the voltage
rating of power supply.
When use the stroboscope,
make sure to identify the
power supply voltage
exactly.
Circuit *
Microcomputer LSI circuit & crystal control time base.
*Digital synthesis circuit for the signal adjusting.
Signal
The signal adjusting circuit is used the digital synthesis
Stability circuit, the output signal will existing high stability and
not change.
2

Power Supply AC ( 110V ) , AC ( 220V or 230V )
Power AC 240mA ( 3600 FPM )
Consumption
Operating Temp. 0 to 50 ℃(32 to 122 ℉).
Operating Less than 80% R.H.
Humidity
Dimension HWD 230 x 110 x 150 mm (9.1 x 4.3 x 5.9 inch).
Weight 1145g/2.52 LB (Meter only)
Housing Compact and impact plastic injection
case with plastic mirror type reflector.
Calibration Crystal time base and microprocessor
circuit, don't necessary take any
external calibration process.
Accessories
Operation manual.................................................................
1 PC.
Included
Power cord.................................................................
1 PC.
SKT-B2279.................................................................
1 PC.
Optional
Flash Xenon tube.......... Model : GA-TB79
Accessory
2-2 Electrical Specification ( 23 ± 5 ℃)
Stroboscope Int /Ext mode : RPM
Flash adjust 50 to 35,000 RPM/FPM.
range * RPM : round per minute.
* FPM : flash per minute.
Resolution
0.1 RPM :
10 RPM :
< 1,000 RPM.
≧10,000 ~ 35000 RPM
1 RPM :
1,000 ~ 9999 RPM
Function Digital rotate knob, MODE, Int./Ext. Select ,
buttons x 2 button, ÷ 2 button, + button, - button,
Accuracy ±(0.05 % reading, + 2d)
3

Stroboscope Int /Ext mode : Frequency
Flash adjust 0.833 to 583.3 Hz.
range * 50 to 35,000 RPM/FPM.
Resolution 0.001 Hz : 0.1 Hz :
< 599.9 RPM. 6,000-35,000 RPM
0.01 Hz :
600.0-5999 RPM
Function Digital rotate knob, MODE, Int./Ext. Select ,
buttons x 2 button, ÷ 2 button, + button, - button,
Accuracy ±(0.05 % reading, + 2d)
Stroboscope External Trigger :Phase Shift (degree)
External Trigger 0 to 359°.
Phase Shift * Use range : 50 to 10000RPM.
* " ° " : degrees.
Resolution 1°
Function buttons Digital rotate knob, MODE, Int./Ext. Select ,
Accuracy ±(0.1 % reading, + 2d)
Signal input
H Level: 2.5 V ~ 12 V , L Level: 0.8 V MAX. > 50 µs
Stroboscope External Trigger : mSec.
Flash adjust 0 to 1200 mSec.
range *Use range : 50 to 10000RPM.
* mSec : mini secend.
Resolution
0.1 RPM :
10 RPM :
< 1,000 RPM.
≧10,000 ~ 35,000 RPM
1 RPM :
1,000 ~ 9999 RPM
Function buttons Digital rotate knob, MODE, Int./Ext. Select ,
Accuracy ±(0.1 % reading, + 2d)
Signal input
H Level: 2.5 V ~ 12 V , L Level: 0.8 V MAX. > 50 µs
*
Spec. tested under the environment RF Field Strength less than
3 V/M & frequency less than the 30 MHz only.
4

2- 3 Flash Tube Specification
Flash tube
Xenon lamp.
Flash Duration Approximately 10 to 30 microseconds.
Flash color Temp. Xenon white 6,500 K degree.
Flash energy 8 Watts-seconds (joules).
Beam Angle 80 degrees.
Flash tube
It is required to change the flash tube
replacement when the instrument start to flash
irregularly at speeds > 3600 RPM/FPM.
Operating duty For prolong life and safety, please
Cycle
adhere to the following operation duty
cycle:
< 2000 RPM - 4 hours
2001 to 3600 RPM - 2 hours
3601 to 8000 RPM - 60 minutes
> 8000 RPM - 30 minutes.
* 10 min. cooling off period between cycles.
5

3. FRONT PANEL & LAYOUT
DESCRIPTION
Fig. 1
6

3-1 Front Cover Screws
3-2 Xenon Tube and Tube Socket
3-3 int/Ext. Select button.
3-4 x 2 button
3-5 ÷ 2 button
3-6 MODE select button
3-7 + button
3-8 - button
3-9 Digital adjusting knob
3-10 External Trigger & Signal output
3-11 ACV Input Socket
3-12 Power On/Off Switch
3-13 LED Display
3-14 RPM function indecator
3-15 deg. function indecator
3-16 mSec. function indecator
3-17 Hz function indecator
3-18 INT. function indecator
3-19 EXT. function indecator
3-20 Trigger function indecator
3-21 Handle
3-22 Tripod fix nut
7

4. STROBOSCOPE MEASURING
PROCEDURES
4-1 Preparation and operating consideration
1) Connect the Power cable into the Power input socket
" 3-11, Fig. 1 ".
Caution :
* The power plug should be
connected to the correct AC
power supply.
2) A " Voltage rating label " is affixed under the
bottom case to show the voltage rating of
power supply.
When use the stroboscope, make sure to identify
the power supply voltage exactly.
Plug power cable's plug into a properly grounded
AC outlet.
3) For prolong life and safety, please adhere to the
following operation duty cycle:
< 2000 RPM - 4 hours
2001 to 3600 RPM - 2 hours
3601 to 8000 RPM - 60 minutes
> 8000 RPM - 30 minutes.
* 10 min. cooling off period between cycles.
4) Do not use fingers or any tool to touch the " Xenon tube "
( 3-2, Fig. 1 )
Caution :
* Do not use fingers or any tool to touch
the " Xenon tube "
* Risk of electric shock !
8

4-2 Checking Speed (RPM/FPM) ---Internal signal MODE
1) Power off the installation to be measured, make a
" mark " on the rotation area where it is intended to
measure the RPM, then power on the installation to
be measured.
2) Press the " Power switch " ( 3-12, Fig. 1 )" to turn on
the Stroboscope.
" 1 " position is power on.
" 0 " position is power off.
3) Press the int/Ext. button. " ( 3-3, Fig. 1 )" select to
INTERNAL SIGNAL MODE.
4) The display will show " 100.0 " RPM ( FPM ), it is the
default value.
Use the " x 2 button " ( 3-4, Fig. 1 ) to adjust the
display value near the estimate setting signal's RPM
approximately..
* Press the " x 2 button " once will double the
display value.
For example, the display is " 100.0 " , press the
" x 2 button " , the display will change to " 200.0 ".
Press once again, the display will change to "
400.0 ".....
* Press " ÷ 2 button " ( 3- 5 , Fig. 1 ) will divide
the display value by two.
For example, the display is " 400.0 ", press the
" ÷ 2 button " , the display will change to " 200.0 ".
Press once again, the display will change to
" 100.0 ".....
5) Setting value by " Digital adjusting knob "
Rotate " Digital adjusting knob " ( 3-9, Fig. 1 )
to adjust the exact display value.
* Turn the knob to clockwise direction will increase
the display value.
* Turn the knob to counter-clockwise direction will
decrease the display value.
9

* If rotate the knob slowly, the display value will
change with high resolution ( change just with 1 digit ).
* If rotate the knob fast, the display value will
change with low resolution ( change with more digits ).
Setting value by " + button " , " - button "
Use the " + button " ( 3-7, Fig. 1 ) , " - button " ( 3-8,Fig. 1 )
to adjust the exact display value.
* Press the " + button " once ( continuously ) will
increase the display value.
* Press the " - button " once ( continuously ) will
decrease the display value.
* If press the button once, the display value will
change with high resolution ( change just with 1 digit ).
* If press the button continuously, the display value will
change with low resolution ( change with more digits ).
When checking the speed, care must be taken
to ensure that the strobe is flashing in unison
(one to one) with the object being monitored.
6) The Stroboscope will also stop motion at 2:1, 3:1, 4:1 et.,
this is normally referred to as harmonics. To ensure
unison, turn the dial until two images appear - this will
double the actual speed. Then lower the flashing rate
until a single and stationary image appears - this is the
actual true speed.
10

4-3 Checking Speed (RPM/deg/ms) ---External signal MODE
1) Connect signal wires with
main body of the instrument
after soldering the wires with
connectors.
Fig.2
2) Firmly plug power cord into a 110VAC (USA) or
220VAC (Europe) single phase outlet.
3) Turn power switch on
4) use int/Ext. button. " ( 3-3, Fig. 1 )" select to External Signal
MODE. And use " MODE button ( 3-6, Fig. 1 )" select to as
following application function.
RPM Mode
When receiving the input signal, the flashing will start and the input
signal will be converted and displayed in rpm. At this moment the
Digital adjusting knob does not interfere
degree , ms Mode ( Delay Mode )
When the input signal cycle is 360°, the flashing can be delayed
by 1~359°.
The delayed angle is adjusted by the Digital adjusting knob.The display
unit can be selected in degree or ms. LED indecator will light up.
deg flashing --shows angle display
ms flashing -- shows time, converted from angle
11

* In delay mode, the correct delayed angle can only be obtained
with a stable input signal
When the input signal frequency exceeds the upper and lower limits,
the alarm mark will be flash displayed and the strobe will stop
flashing
4-4 Synchronous signal output
The synchronous signal is output from # 4 pin connector.
connect wire digram ref. Fig. 2
4- 5 Checking Motion
For motion analysis, simply locate the actual speed as mentioned
above and then turn the dial slowly up or down. This will give a
slow motion effect allowing complete inspection.
12

5. FLASH TUBE REPLACEMENT
The flash tube requires changing when the instrument start
to flash erratically at speeds of 3600 RPM/FPM or more.
Caution :
* Change of the Flash Tube
should only be done by a
qualified technician. As the
instrument contains no user
serviceable parts.
* Before replace the tube, should
power off the meter, and wait
at least 15 minutes until the
circuit be discharged completely.
1) Loosen ( rotate ) the " Front Cover Screws " ( 3-1, Fig.1 )
and take away the " Front end protection cover " and
" reflectors of light ".
2) There is a plug and the socket for connecting
the tube with the main instrument.
Take away the tube and replace the new unit.
3) Assemble the light reflector and protective cover and lock
the screws.
13

6. THE ADDRESS OF AFTER SERVICE
CENTER
14