Charder MG 4800 User manual

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USER MANUAL
MG4800
Handgrip Dynamometer
Please keep the instruction manual at hand all the time for future reference.

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Explanation of Graphic Symbols on Label/Packaging
Caution, consult
accompanying documents
before use
Separate collection for
waste of electrical and
electronic equipment,
in accordance with
Directive 2002/96/EC
Manufacturer of medical
device
Manufacturing year of
medical device
Carefully read user manual
before installation and
usage, and follow
instructions for use.
Medical electrical
equipment with Type B
applied part

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Copyright Notice
Charder Electronic Co., Ltd.
No.103, Guozhong Rd., Dali Dist., Taichung City 41262 Taiwan
Tel: [phone]
Fax: [phone]
Website: www.chardermedical.com E-mail: [e-mail]
Copyright© Charder Electronic Co., Ltd. All rights reserved.
This user manual is protected by international copyright law. All content is
licensed, and usage is subject to written authorization from Charder
Electronic Co., Ltd. (hereinafter Charder) Charder is not liable for any
damage caused by a failure to adhere to requirements stated in this
manual. Charder reserves the right to correct misprints in the manual
without prior notice, and modify the exterior of the device for quality
purposes without customer consent.
Charder Electronic Co., Ltd.
No. 103, Guozhong Rd., Dali Dist.,
Taichung City, 41262 Taiwan

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CONTENTS
I. Safety Notes .......................................................................... 5
A. General Information ................................... 錯誤! 尚未定義書籤。
II. Installing Batteries............................................................... 8
III. Display and Key Functions .................................................. 9
IV. Using Device .......................................................................10
A. Correct Grip ...................................................................... 10
B. Incorrect Grip.................................................................... 12
C. Mode Switching ................................................................. 13
D. Real Mode......................................................................... 14
E. Count Mode....................................................................... 15
F. AVG Mode.......................................................................... 16
G. Max Mode ......................................................................... 17
V. Product Specifications ..........................................................19
A. Device Information ............................................................ 19
VI. Declaration of Conformity ...................................................20

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I. Safety Notes
Thank you for choosing this Charder Medical device. It is designed to be
easy and straightforward to operate, but if you encounter any problems
not addressed in this manual, please contact your local Charder service
partner.
Before beginning operation of the device, please read this user manual
carefully, and keep it in a safe place for reference. It contains important
instructions regarding installation, proper usage, and maintenance.
Intended Use
This device is intended to measure the handgrip of subjects, for diagnosis
of strength-related issues by professionals.
General Handling
Ensure the correct spring is installed before usage.
Make sure the display shows zero before use. The device is designed
to detect when a stable force has been achieved, and the indicator
will beep to indicate that the reading can be taken.
Safety Instructions
Before putting device into use, please read this user manual carefully. It
contains important instructions for installation, usage, and maintenance
of device.
The manufacturer shall not be liable for damages caused by failure to
heed the following instructions:
Batteries should be kept away from children. If swallowed, promptly
seek medical assistance.
Expected service life: 5 years.
Always comply with appropriate regulations when using electrical
components under increased safety requirements.
Observe permissible ambient temperatures for use
Environmental
All batteries contain toxic compounds; batteries should be disposed
of via designated competent organizations. Batteries should not be
incinerated.

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Cleaning
Device surface should be cleaned using alcohol-based wipes.
Do not use large amounts of water when cleaning the device, as it
may cause damage to the internal electronics.
Maintenance
Please contact your local Charder distributor for regular maintenance
and calibration.
Device does not require routine maintenance. However, regular
checking of accuracy is recommended; frequency to be determined
by level of use and state of device. If results are inaccurate, please
contact local distributor.
Warranty/Liability
If Charder is responsible for a fault or defect present upon receipt of
the unit, Charder shall either repair the fault, or supply a
replacement unit. Should the repairs or replacement delivery fail,
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.
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 and tear, changes or modifications, incorrect or
negligent handling, chemical, electrochemical, or electrical
interference, unless damage is attributable to negligence on the part
of Charder.
This device does not contain any user-maintained parts. All
maintenance, technical inspections, and repairs should be conducted
by an authorized Charder service partner, using original Charder
accessories and spare parts. Charder is not liable for any damages
arising from improper maintenance or usage. Dismantlement of the
device will void the warranty.
Disposal
This product is not to be treated as regular household waste, but
should be taken to a designated collection points for electronics.
Further information should be provided by local waste disposal
authorities.
Warning
Do not under any circumstances dismantle or alter the device, as this

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could result in electric shock or injury as well as adversely affect the
precision of measurements.
Do not place the device in direct sunlight, or in close proximity to an
intense heat source. Excessively high temperatures may damage the
internal electronics.

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II. Installing Batteries
1. Remove battery cover (rotate
counter-clockwise to loosen)
2. Insert new CR-2450 lithium
battery
3. Secure battery cover (rotate
clockwise to tighten)
NOTE: If device is to be placed in storage for extended period of time
(e.g. >3 months), please remove battery to avoid damage to device.
Open
Close

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III. Display and Key Functions
LCD Screen
Key Function
/Zero: Power on/Power off/Zero. When device is off, press to power
on. Press to zero value. Press and hold for 3 seconds to turn off.
(NOTE: please release device (do not squeeze) before zeroing value.)
Mode: press to toggle between different modes
Set: In real mode, this will switch between units. In other modes, this will
adjust digits.

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IV. Using Device
A. Correct Grip

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B. Incorrect Grip

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C. Mode Switching
NOTE: Real Mode is the default mode. If the device is powered off in any
other mode, it will start in that mode the next time it is powered on.
Real time display and Unit setup
Counts the number of times subject
reaches target force
Measures maximum force exerted
AVG Mode
Max Mode
Power ON
Real Mode
Count Mode
Average the last two results

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D. Real Mode
Real Mode is a dynamic mode. The force value will fluctuate according to
force exerted during usage.
Real Time Display:
Release
Grip
Release
kg / lb setup:

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E. Count Mode
Count Mode sets a target grip force to be achieved by the subject. Grip
force must reach target goal in order to be counted.
SETUP TARGET GRIP FORCE
COUNTING OPERATION

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F. AVG Mode
AVG mode is designed to help average the grip strength of both hands.
Ex: Subject grips device with left and right hand. Physician presses SET
to calculate the average value of the last two usages.
NOTE: force must exceed 2 kg to be registered
1st
2nd
Calculate average
by pressing SET.
Return to
average mode
Ready to grip
First use
Second use

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G. Max Mode
Max mode is designed to compare the force of an impaired hand with a
healthy hand.
Ex: Subject has impaired left hand. Subject measures grip strength of
healthy right hand. Percentage goal is set. Subject then grips using left
hand, and device will evaluate if grip strength exceeds defined
percentage of last measurement.
If gripping force is
less than 31% of last
use, result will not
refresh on LCD.
If gripping force
exceeds 31% of last
use, new result
appears on LCD.
Set up percentage of grip
force for refresh
First use is 50 kg
Start in Max mode

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Error Messages
Error Message
Reason
Action
Low battery warning
Voltage of battery is too
low to operate device
Replace batteries
Force under zero
Force is under zero when
device is powered on
Press ZERO key and
try again
Force over zero
Force is over limit when
device is powered on
Ensure nothing is
pushing on device and
power on again. If
problem persists,
please contact
distributor
Counting Error (too
low)
Force is under limit when
device is powered on
Ensure nothing is
pulling on device and
power on again. If
problem persists,
please contact
distributor
Program Error
Fault with device software
If problem persists,
please contact
distributor

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V. Product Specifications
A. Device Information
Model
MG4800
Weight
Measurement
Capacity
80 kg
(blue)
40 kg
(green)
20 kg
(red)
Graduation
0.1 kg / 0.2 lb
Accuracy
±0.2kg / ± 0.4lb
Unit
kg / lb
LCD Screen
0.5-inch LCD screen (4 digits)
Dimensions
Overall
212(W) x 55(D) x 101(H) mm
Grip Span
64 mm
Device
Weight
0.4 kg
Key Functions
On/Off/Zero, Mode, Set
Data Transmission
Power Supply
CR-2450 Lithium Battery
Operation Temperature &
Humidity
5℃~35℃
Standard Accessories
Carry case x1, Battery x1, Spring Set
(80 kg) x1, Spring Set (40 kg) x1,
Spring Set (20 kg) x 1

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VI. Declaration of Conformity
This product has been manufactured in accordance with the harmonized
European standards, following the provisions of the below stated
directives:
Electro Magnetic Compatibility Directive 2014/30/EU
Low Voltage Directive 2014/35/EU
FCC Class B Declaration of Conformity
This device complies with the limits for a Class B digital device, persuant
to Part 15 of the FCC rules
Manufactured by:
Charder Electronic Co., Ltd.
No.103, Guozhong Rd., Dali Dist.,
Taichung City, 41262 Taiwan (R.O.C.)
Patent number list
Japan Patent: 1314405
RCD Patent: 000702592-0001
US Patent: D564382
CD-IN-1035 REV 001 11/2020