Kusam-meco KM 2240 User manual

G 17, Bharat Industrial Estate, T. J. Road,
Sewree (W), Mumbai - 400 015. INDIA.
Sales Direct : [phone]
Tel. : [phone]. Fax : [phone]
Email : [email protected]
Website : www.kusamelectrical.com
www.kusam-meco.co.in
®
MODEL - KM 2240
®®
AN ISO 9001:2008 COMPANY
DIGITAL STROBOSCOPE
TACHOMETER
OPERATION MANUAL

MODEL - KM 2240
DIGITAL STROBOSCOPE
TACHOMETER
TABLE OF CONTENTS
PAGE
01
01
02
03
04
05
10
12
13
1. Introduction............................................
2. Features..................................................
3. Technical Parameter..............................
4. Displays..................................................
5. Panel Description..................................
6. Operation...............................................
7. Attention.................................................
8. Test Certificate.......................................
9. Warranty.................................................
TITLE
WARNING
Do not point the light beam of the instrument
at have it reflected into the eyes of people or
animals to avoid injury.

0201
I. Introduction about the functions :
Flash-frequency velocity measuring device is a rotation
speed measuring device that makes use of persistence of
vision (when the light source synchronizes with the rotation
speed of an object at a pre-set flashing frequency, a
relatively static phenomenon called visual persistence will
occur). In the course of observation of an object that rotates
or moves at a high speed, adjust the flashing frequency of
the device to synchronize it with the rotation or movement
speed of the object. Although the object being measured
moves at a high speed, it appears to move slowly or static.
This is an optical phenomenon of visual persistence where
high-speed movement of an object can be easily observed
with the naked eye. By using this method, the rotation
speed of various rotating objects can be measured, and the
movement and defects on the surface of an object can be
inspected or detected. It is widely used to detect the defects
on the surface and movement track of high-speed rotating
objects such as various types of rotors, meshing gears,
vibration, diagnostic equipment as well as textiles, printing
production lines, etc.
II. Performance features :
The advanced technology such as micro-computer
technology (CPU), photovoltaic technology and anti-
jamming technology are applied to conduct non-contact
measurement of rotation speed, as well as to inspect the
status of moving objects and detect defects on the
surface.
Large LCD with backlight, which ensures a clear display
of data and the avoidance of visual errors.


Two regulation ways : single-step regulation (coarse / fine
tuning) and continuous regulation (course/ fine tuning).
Easy for measurement.

There are special backlight and flash control switches
available, saving battery power.

When the power supply voltage is lower than the required
value, the device will automatically give a message.

The device has a sturdy and exquisite structure. Durable
electronic components are used. Its shell is made of light
solid ABS plastic with excellent shape. Easy to carry and
to operate.

Data storage function available. Up to 10 pieces of flash
frequency data can be stored and can be retrieved at any
time for use. It is convenient and quick.

III. Technical parameters :
Measurement range : 60 ~ 40000RPM/FPM
RPM : R / min
FPM : F / min
When the coarse / fine tuning range <1000RPM,
Coarse tuning : 10RPM/FPM
Fine tuning : 0.1RPM/FPM
≥1000RPM,
Coarse tuning : 100RPM/FPM
Fine tuning : 1RPM/FPM
Accuracy : 0.05%
Resolution : <1000RPM : 0.1RPM/FPM
≥1000RPM : 1RPM/FPM
Time base : 10MHz quartz crystal oscillator
Display : 5 digits, LCD with backlight in it,
max. display : 40000
Power supply : battery : 4 1.5VAA (UM-3)

04
Power loss : about 60mA
Overall dimensions : 195 73 38mm 
FPM : F / min
* The values of FPM and RPM are same, so let’s use
RMP in the following example.
IV. Displays :
1. Fine tuning symbol. When it appears, it means fine
tuning.
2. Symbol for rotation speed unit, R/ min.
3. Prompt symbol for “under measurement”.
4. Prompt symbol for measurement data storage (by a flick
of the storage button, “PRESTORE” will be on, and data
will be stored. After data storage is complete, the light will
turn off).
5. Measurement data.
6. Low-voltage prompt symbol.
When it appears it means that the battery power is low.
03
+
-
40000
FINE
PRESTORE
RPM
43
5
2
1
6
V. Description of the Panel :
A. Object being measured
B. Optical path
C. Flash
D. Flash switch
E. LCD
F. Value increase button
G. Value reduction button
H. Coarse / fine tuning switch button
I. Power switch, data retrieval button
J. Data storage button
K. Battery compartment cover
L. Backlight control switch
L K
UP
DOWN
FINE
ADJUST
DOWN
PEAK
B
B
C
I
+
-
40000
PRESTORE
RPM
FINE
G
H
F
E
D
J

0605
VI. Operation :
1. Select a place for observation :
As the surfaces of some objects are fissured, rough and
uneven, which vary in light reflection, there are bright
and dim lights, or there are asymmetric texts, images or
marks at different positions. We can select one of these
most obvious positions as an observation place. If the
surface of the object is very smooth and gives the same
light reflection, the surface can be made fissured, rough
or uneven manually, or some asymmetric texts, images
or marks may be created on it.
2. Power on / off :
Open the battery compartment cover on the back of the
shell, fit in batteries and press the starting button “ ” for
a while. After 3 seconds, the device will start and the
initial value of 4000RPM will be displayed. If the
measurement data has been stored after previous use,
the latest measurement data stored will be displayed. At
this time, the state of single-step coarse tuning is the
default. Press “ ” again for a while, and after 3 seconds
the device will turn off and cease operation.
3. Switch on the backlight :
Open the battery compartment cover on the back of the
shell, take out a battery at the lowest end, and set the
backlight control switch at “ON” (it means “turn on the
backlight”) or “OFF” (it means “turn off the backlight”)
according to your needs. After you start the device, if the
switch has been set at “ON” position, backlight will be
on; otherwise, backlight will be off.
4. Switch on the flash :
After you start the device, any time you press the flash
switch, the flash will flicker at the frequency value
displayed on the screen. After you stop pressing the
button, the flash will be off.
5. Coarse / fine tuning switch :
After you start the device, any time you press the
“FINE” button, you switch between coarse / fine tuning.
In the case of fine tuning, the characters “FINE” will
appear on the left top of the display. In the case of
coarse tuning, no prompt will appear.
6. Single-step regulation of rotation speed :
In the state of coarse tuning, every time when you press
the “UP” button on the “OWN” button, the value of
rotation speed will increase or reduce by 100RPM
accordingly (when the tuning range > 1000RPM) or
10RPM (when the tuning range < 1000RPM). In the
state of fine tuning, every time you press the “UP” button
or the “DOWN” button, the value of rotation speed will
increase or reduce by 1RPM accordingly (when the
tuning range > 1000RPM) or 0.1RPM (when the tuning
range < 1000RPM).
7. Continuous regulation of rotation speed :
In order to improve the regulation efficiency and save
the time of regulation, the device can also be regulated
in a continuous way. In case of single-step regulation,
keep pressing the “UP” or “DOWN” button. After one
second, the device will enter the state of continuous
regulation. In the state of coarse tuning, the device will
automatically increase or decrease by 100RPM (when
the tuning range > 1000RPM time) or 10RPM (when the
tuning range < 1000RPM) every 0.2S. In the state of
fine tuning, the device will automatically increase or
decrease by 1RPM (when the tuning range > 1000RPM
Time) or 0.1RPM (when the tuning range < 1000RPM)
every 0.2S. Once you stop pressing the button,
continuous regulation will be terminated, and the device
will be in the state of single-step regulation.

0807
8. Data storage function :
*(Regulation limits : In case of any tuning state, when the
upper limit of 40,000RPM is exceeded, the device will
automatically remain at the 40,000RPM / FPM. At this
time if you press the “UP” button again, there will be no
response. When the speed is lower than the lower limit of
60RPM, the device will automatically remain at 60RPM /
FPM. At this time, even if you press the “DOWN” button,
there will be no response.)
After adjusting speed, press the data storage button in
the center of the device panel to store the current value.
The next time the device is started, the latest
measurement data stored in it will be displayed and you
will not have to adjust the flash frequency. So it’s very
easy to use. In the future, the pre-set data stored in the
device can be retrieved at any time (up to 10 pieces of
data can be stored).
9. Data retrieval :
Every time after the measurement, flick the data storage
button (J) to store the measurement value. Up to 10
pieces of frequently used data can be stored in the
device. Every time you start the device, the latest value
stored in the device will be displayed. In case of retrieval
of the data stored in the device, flick the “READ” button.
With every flick of the button, one piece of data will be
displayed (press it for a little while). The frequently used
data stored can be retrieved successively in a cycling
way (10 default values stored in the device at the
initialization phase are as follows in numerical order :
4000, 8000, 12000, 16000, 20000, 24000, 28000,
32000, 36000, and 40000, which is easy for the user to
find the data quickly, is close to the actual value, and
shortens the time of regulation).
10. Measurement of rotation speed :
After you start the device, press the flash source
switch, direct the light bar onto the rotating surface of
the object, observe the light spot and adjust the
flashing frequency of flash. If the flashing frequency of
flash is adjusted to the same rotation speed of the
object, there will be a visual persistence phenomenon
that the object appears static. If the surface is
obviously uneven or there are asymmetric texts,
images, or marks on the surface of the object, the
persistence of vision will be very obvious. When the
texts, images, or marks are almost static and the light
spot flickers increasingly slowly, the fine tuning function
can be applied. At this time there will be N texts,
images, or marks which are relatively stable or even
static. (See Figure 1)
1)
Figure 1
N = 1 N = 5
When N = 1, the texts, images or marks will be static
and the light spot does not rotate; at this time the value
displayed on the device is the rotation speed value of
the object. When N = 1, the texts, images or marks will
be static and the light spot does not flicker; at this time
the value displayed on the device is N times the speed
value of the object. Divide the value displayed on the
device by N to calculate the actual speed value of the
object.

1009
If the surface of the object is relatively smooth, adjust
the flashing frequency of the flash until the light spot on
the rotating surface of the object no longer flickers,
appears static and the brightest. At this time, the value
displayed on the device is the rotation speed value of
the object. (Because in this case, the optical
phenomenon of visual persistence is not obvious so it
is not easy for the testing personnel to make
observations. In order to improve the measurement
accuracy, it is suggested that the user affix a small
piece of reflective slip or a label, or mark with a pen on
the rotating surface.) If you select other places for
observation, there will be a similar optical phenomenon
on the rotating surface of the object.
2)
11. Monitor the movement of the object :
If you have already known the movement rate of the
object, adjust the device to the corresponding flashing
rate (FI minute), press the flash switch and direct the
light bar to the moving surface of the object. If the
optical phenomenon of visual persistence occurs (if the
object appears static, or the texts, images or marks are
static and the light spot does not flicker), it indicates
that the object operates properly. If no optical
phenomenon of visual persistence occurs, it indicates
that the object does not operate properly and the
movement speed has exceeded the limited scope, so it
i s n e c e s s a r y t o c a r r y o u t m a i n t e n a n c e .
Check if there are any defects on the surface of
high-speed rotating object :
The optical phenomenon of visual persistence occurs
when you measure the rotation speed. It is because the
flashing frequency of flash synchronizes with the
rotation speed of the object. At this time the object
appears static, and even with the naked eye, it is easy
to detect if there is any defect on the surface of the
object.
VII. ATTENTION :
1. If you know the approximate rotation speed of the object,
better results can be achieved by using this device to
measure and monitor the rotation speed.
2. The surface of the object shall need to be fissured,
rough and uneven, or there are obvious parts for
reflection on the surface, such as an electric drill bit, fan
blades, etc.
3. When the voltage of power supply is lower that the
required value, the low voltage prompt will appear at the
left bottom of the display, which means the voltage of
batteries is too low and replacement of battery is
required.
4. Do not direct the flash toward humans’ or animals’ eyes,
as it may cause harm.
5. Do not leave the device close to water or any other
corrosive liquid so as to avoid causing Damages to the
device.
6. In case the device is not used for a long time, please
remove the batteries so as to avoid causing damages to
the device as a result of battery leakage.

1211
MUMBAI
TEST CERTIFICATE
DIGITAL STROBOSCOPE TACHOMETER
This Test Certificate warrantees that the product has been
inspected and tested in accordance with the published
specifications.
The instrument has been calibrated by using equipment
which has already been calibrated to standards traceable
to national standards.
MODEL NO. ________________
SERIAL NO. ___________
DATE: ___________
ISO 9001
REGISTERED
QC
PASS
KUSAM-MECO
KM 2240
WARRANTY
Each “KUSAM-MECO” product is warranted to be free from defects in
material and workmanship under normal use & service. The warranty
period is one year (12 months) and begins from the date of despatch of
goods. In case any defect occurs in functioning of the instrument, under
proper use, within the warranty period, the same will be rectified by us
free of charges, provided the to and fro freight charges are borne by you.
This warranty extends only to the original buyer or end-user customer of a
“KUSAM-MECO” authorized dealer.
This warranty does not apply for damaged Ic’s, fuses, burnt PCB's,
disposable batteries, carrying case, test leads, or to any product which in
“KUSAM-MECO’s” opinion, has been misused, altered, neglected,
contaminated or damaged by accident or abnormal conditions of
operation or handling.
“KUSAM-MECO” authorized dealer shall extend this warranty on new
and unused products to end-user customers only but have no authority to
extend a greater or different warranty on behalf of “KUSAM-MECO”.
“KUSAM-MECO’s” warranty obligation is limited, at option, free of charge
repair, or replacement of a defective product which is returned to a
“KUSAM-MECO” authorized service center within the warranty period.
THIS WARRANTY IS BUYER’S SOLE AND EXCLUSIVE REMEDY AND
IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
“KUSAM-MECO” SHALL NOT BE LIABLE FOR ANY SPECIAL,
INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR
LOSSES, INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE
WHATSOEVER.
All transaction are subject to Mumbai Jurisdiction.