Charder MG 4800 User manual

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MG 4800
Medical Handgrip Dynamometer
USER MANUAL
Please keep the instruction manual at hand all the time for future reference.

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TABLE OF CONTENTS
PREFACE........................................................................................2
GENERAL INFORMATION..............................................................2
SAFETY INSTRUCTION..................................................................2
ENVIRONMENTAL ..........................................................................3
CLEANING.......................................................................................3
MAINTENANCE...............................................................................3
MEASURING OPERATION .............................................................4
WARRANTY-LIABILITY...................................................................4
DISPOSING.....................................................................................5
CAUTION.........................................................................................5
INCORRECT GRIPPING POSTURE-1............................................6
INCORRECT GRIPPING POSTURE-2............................................7
CORRECT GRIPPING POSTURE-1................................................8
CORRECT GRIPPING POSTURE-2................................................9
SPECIFICATION............................................................................10
LCD DISPLAY................................................................................10
KEY FUNCTIONS..........................................................................11
MODE SWITCHING.......................................................................12
MODE DESCRIPTION...................................................................13
INSTRUCTION FOR BATTERY INSTALLATION..........................17
ERROR MESSAGE........................................................................18

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PREFACE
Thank you for choosing CHARDER MEDICAL product. All features of this
product were designed to state of the art and are optimized for simple and
straightforward use. If you have any queries or experience any problems
not addressed in the operating instructions, please contact your
CHARDER MEDICAL service partner, or visit us on the Internet at
www.chardermedical.com
GENERAL INFORMATION
The Medical Handgrip Dynamometer is a medical device for doctors to
evaluate the recovery condition of patient’s impaired hand. The data
acquired from the Medical Handgrip Dynamometer could be used as a
reference for therapists and physicians to view the rehabilitation progress.
The Medical Handgrip Dynamometer provides rehabilitation exercise
solutions for patients and physicians.
SAFETY INSTRUCTION
Before putting the device into use, please read through the
Operating Instructions carefully. They contain important instructions for
installation, proper use and maintenance of the device. The manufacturer
shall not be liable for damages cause by failure to heed the following
instructions:
When using electrical components under increased safety requirements,
always comply with the appropriate regulations.
Improper installation will render the warranty null and void.
This device is designed for use indoors.

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Observe the permissible ambient temperatures for use (Technical
Information).
The device meets the requirements for electromagnetic compatibility. Do
not exceed the maximum values specified in the applicable standards.
If you have any problem, contact your local CHARDER MEDICAL service
partner.
ENVIRONMENTAL
The optimum operating temperature for the device is 5℃to +35℃;
although it will operate at higher and lower temperatures the battery life will
be adversely effected.
All batteries contain toxic compounds; disposal of batteries should be
delegated to a competent organization, complying with the deposit of
Poisonous Waste Regulation 1972.
Please do not incinerate batteries.
CLEANING
We would recommend using alcohol based wipes or similar when cleaning
the device.
Please do not use large amounts of water when cleaning the device as this
will cause damage to the device electronics, you should also refrain from
using corrosive liquids or high pressure washers.
Always power off the device before cleaning.
MAINTENANCE
The device does not require any routine maintenance. However, we
recommend checking the device’s accuracy at regular intervals. The
regularity of these checks is dependent on the level of use and the state of
the device. If any inaccuracies occur, please contact your local dealer or
CHARDER MEDICAL service partner.

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MEASURING OPERATION
Before reading detailed instructions on how to use all the measuring
functions that are built into your device, please read the following important
guidelines:
 Always be sure that the display shows `Zero` before use, if it does not then
please press the ZERO key.
The Medical Handgrip Dynamometer is designed to detect when a stable
force is achieved, the indicator will `beep` to indicate a stable force value,
your reading should be taken at this point.
WARRANTY-LIABILITY
If a fault or defect is present on receipt of the unit which is within CHARDER
MEDICAL’s scope of responsibility, CHARDER shall have the right to either
repair the fault or supply a replacement unit. Replaced parts shall be the
property of CHARDER. Should the fault repairs or replacement delivery not
be successful, the statutory provisions shall be valid. The period of warranty
shall be two years, beginning on the date of purchase. Please retain your
receipt as proof of purchase. Should your device require servicing, please
contact your dealer or CHARDER MEDICAL Customer Service.
No responsibility shall be accepted for damage caused through any of the
following reasons: Unsuitable or improper storage or use, incorrect
installation or commissioning by the owner or third parties, natural wear,
changes or modifications, incorrect or negligent handling , overuse,
chemical, electrochemical or electrical interference or humidity, unless this
is attributable to negligence on the part of CHARDER MEDICAL.
If operating climatic or any other influences lead to a major change in
conditions or material quality, the treaty for perfect unit functioning shall be
rendered null and void. If CHARDER provides an individual warranty, this

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means that the unit supplied will be free of faults for the length of the
warranty period.
DISPOSING
This product is not to be treated as regular household waste, but should be
handed in to an electrical/electronic equipment recycling centre.
You can obtain further details from your local council, your municipal waste
disposal company or the firm which you purchased the product.
CAUTION
DO NOT USE THIS DEVICE WITHOUT HELP FROM MEDICAL
PROFESSIONALS.
!

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INCORRECT GRIPPING POSTURE-1
a.
b.

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INCORRECT GRIPPING POSTURE-2
c.
d.

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CORRECT GRIPPING POSTURE-1
a.Left Hand b.Right Hand

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CORRECT GRIPPING POSTURE-2
c.Left Hand
d.Right Hand

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SPECIFICATION
Capacity 80kg
(blue) 40kg (green) 20kg (red)
Division 0.1kg / 0.2lb
Accuracy ±0.2kg / ±0.4lb
LCD Display 0.5 inch 4 digital LCD
Operating Temperature 5℃/ 35℃
Unit kg / lb
Dimensions (including handles)
212 x 55 x 101 mm
Battery CR-2450 x 1
Auto Off Time 60 sec
Standard Accessory Carry case x 1 , CR-
2450 x 1 , spring set
80kg x 1 , spring set 40kg x 1 , spring set
20kg x 1 , MG4800 x 1
LCD DISPLAY

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KEY FUNCTIONS
MG 4800
Key Description
 /ZERO : Power on / Power Off / Zero
Press to Power On, hold for 3 seconds to Power Off.
Press to ZERO the value.
 Mode : Mode selection.
 Set : Real Mode: Unit switches.
Other modes: digit adjusts.
※ Please release the device before zeroing the value.

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MODE SWITCHING
The following procedure gives you a specific idea of using Medical
Handgrip Dynamometer.
Please note that Real Mode is the default mode. If the device is powered off
in any other modes. Next time it will start with the powered off mode.
Real time display and Unit setup.
Count the number of times by
reaching target force.
Displays maximum force during
usage.
AVG Mode
Max Mode
Power ON
Real Mode
Count Mode
Average the last two results.

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MODE DESCRIPTION
R
RE EA AL L M MO OD DE E
The Real Mode is a dynamic mode. The force value fluctuates according
to the gripping force during usage.
Real Time Display：
：：
：
Following is an operation process.
Release Gripping Release
kg & lb SETUP：
：：
：

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C
CO OU UN NT T M MO OD DE E
The Count Mode is for physician to set up a rehabilitation program for
patient to do rehabilitation exercise with exact force measurement.
For Example：
：：
：
Set up target grip force before use.
NOTE: Only if the force reaches the target is counted one times.
SETUP TARGET GRIP FORCE
COUNTING OPERATION

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A
AV VG G M MO OD DE E
The AVG Mode is for physician to evaluate the average of both hand’s
force.
For example：
：：
：
Grip once individually with right and left hand, then press SET to calculate
average value of last two grips.
NOTE: The force must be greater than 2kg
1
st
2
nd
Calculate average
by pressing SET.
Any operation will
have no effect.
Return to
average mode
Ready to grip
The first try
The second try

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M
MA AX X M MO OD DE E
The MAX Mode presents the maximum force of impaired hand. Medical
professions can evaluate the condition of patient’s impaired hand through
the results.
For example：
：：
：
If gripping force less
than 31% of last force.
It will not refresh the
result on LCD.
If gripping force
exceeds 31% of last
force. The new result
appears on LCD.
Set up percentage of
gripping force for refresh
The first grip is 50kg
Start in MAX MODE

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INSTRUCTION FOR BATTERY INSTALLATION
MG 4800 uses CR-2450 lithium battery. Please read the following
instruction before replacing battery.
1. Removing the battery cover 2.Installing a new CR-2450
by turning anticlockwise. lithium battery.
3. Locking the battery cover by turning clockwise.
Open
C
lose

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ERROR MESSAGE
1. Low Battery Indication
This warning show that the voltage of battery is too low for
operation, please replace battery.
2. Force Under Zero
The force is under zero when power on; press ZERO key
and try again.
3. Force Over Zero or Counting Error
The force is over limit when power on, please reduce the
force and power on again. If the problem still exists, please
contact your local CHARDER MEDICAL service partner.
4. Counting Error (too low)
The force is lower than limit when power on, please
increase the force and power on again. If the problem still
exists, please contact your local CHARDER MEDICAL
service partner.
5. EEPROM Error
The program has encountered internal error; please
contact your local CHARDER MEDICAL service partner.

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Please see separate document showing on sticker of device for above CE
marking.
Patent number list
Taiwan Patent：D120762
Japan Patent：1314405
RCD Patent ：000702592-0001
US Patent ：D564382
FDA no.: D072477
Manufactured by:
Charder Electronic Co., Ltd.
No.103, Guozhong Road, Dali District,
Taichung City 412, Taiwan (R.O.C.)
IN-1035 [7031H] 06/2016