SAEHAN DHD-1 User manual

DHD-1 Digital Hand Dynamometer
User Manual
Includes Data Transfer Software Installation and Usage

3
DHD-1 Digital Hand Dynamometer – Operating precautions
Preparations
Warnings
“WARNING: No modification of this equipment is allowed”
Do not use this device near equipment emitting strong electromagnetic waves
(e.g. X-ray, MRI. etc.) which can affect measured values.
Do not disassemble, modify, or attempt to repair this device including the
gauge cover and body, or replace the battery. If there is a problem, contact
your supplier or Saehan Corporation. Saehan Corporation is not responsible
for degradation of performance and operational errors due to any attempt to
disassemble, modify, or repair the device.
Cautions
The power of this device can be supplied by connecting to a PC and using
the USB cable provided. The rated power of the PC to USB connection is 5V,
500mA. Check the rated power before use.
This device is designed to measure grip strength. Do not measure other parts of
the body or other objects, or the device may be permanently damaged.
Use this device only after fully charging when 'Lobt' is displayed at bottom left
corner of the LCD. The button functions will not work before charging. If the
LCD panel does not operate regardless of charging, contact your supplier or
Saehan Corporation. Do not attempt to repair yourself.
To insure accurate measurements, avoid applying maximum load on the device.
The most unfavorable condition to avoid is testing when first connecting the
USB cable to a PC for charging when the battery is fully discharged. Allow the
battery to charge before using.

4
DHD-1 Digital Hand Dynamometer - Operating precautions
Do not expose the equipment to high temperature over 60°C (140°F) and high
humidity to reduce the risk of electric shock. Do not touch the device with wet
hands.
The internal connections and external gauge cover are insulated with plastic and
flame retardant materials to prevent induction of electrical current. In addition,
the device body and the handle which are subject to contact with human body
parts (hands) are also insulated.
The device can be cleaned by wiping the surface with a soft cloth dampened
with water and then drying the surface thoroughly with a clean cloth. Do not
use any of the following chemicals for cleaning the device or the protective case
resulting in damage:
- Thinner, benzene, alcohol, insect repellent, pesticide, sunscreen, etc.
Do not touch the any part of the device with hands stained with any of the
substances listed above.
Do not make contact of the USB cable and patients. This will prevent risk of
slight electric shock.
Guidance
This device should be only be used by professionals (or under the direction a
professional) that fully understands the contents of the manuals before usage.
Although synthetic resins, with hardness in accordance with standards, are
used in the protective gauge cover, avoid abnormal shocks to the gauge such as
dropping from any height onto a hard surface.
The USB cable provided is USB A – mini B USB 2.0 cable (480Mbps) and is
used to charge the battery and to transmit data. Be careful to avoid damaging the
connector ends of the cable by forcing into the device or PC. Pay attention to the
shape of the connectors and the shape of the receptacles on the device and PC.

5
DHD-1 Digital Hand Dynamometer - Operating precautions
Be aware that conductors delivering power are more likely to be damaged when
the USB cable is stored with excessive bending. Replace a damaged USB cable
with a USB cable with the same standard connectors on each end.
Use the instrument by combining the body and the adjustable handle by aligning
the directional arrow labels to prevent incorrect placement of the handle.
One type of printed manuals is provided for the use of equipment. Users can
download and use the electronic manuals (PDF files) from the manufacturer’s
website (www.saehanmedical.com) as needed.
Keep the device in the hard case provided when not in use and when moving the
device to prevent damage. Be sure the case is fully closed and the latch secured.
Press and hold the PWR button for a long duration for safe shutdown of the
device.
The manufacturer will provide circuit diagrams, lists of components,
descriptions, directions for correction, and other information to authorized
service representatives as needed.

6
DHD-1 Digital Hand Dynamometer - Operating precautions
Disposal of old Electrical & Electronic Equipment
(Applicable in the European Union and other European
countries with separate collection systems.)
This symbol indicates that this device shall not be treated as
household waste. Instead, it shall be handed over to the applicable
collection point for the recycling of electrical and electronic
equipment. By ensuring this device is disposed of correctly, you will help
prevent potential negative consequences for the environment and human health
which could otherwise be caused by inappropriate waste handling of this
device. For more detailed information about recycling this device, please refer
to local governing ordinances and recycling plans.

7
DHD-1 Digital Hand Dynamometer - Operating precautions
Information on Components
1. Load Cell: FX1901 series (FX1901-0001-0100-L)
2. Battery: Lithium-Ion Polymer Re-chargeable Battery
(BK053048AH 700mA)
3. Gauge Cover and Ring: Plastic Enclosure - ABS (Fire retardant)
4. Guide: Plastic Enclosure - PC (Fire retardant)
5. PCB Connector (Socket / Housing):
12505WS-02/04 (Socket), 12505HS-02/04 (Housing)
6. Body and Handle: Die cast aluminum alloy
7. Posts: Aluminum Plating
8. Handle Clip: Stainless Steel
9. Safety Strap: Nylon
10. USB Cable: USB A - mini B USB 2.0 Cable (480Mbps)
11. Hard Case: HDPE

8
DHD-1 Digital Hand Dynamometer - Operating precautions
Definition of using symbols
CATALOGUE NUMBER
DATE OF MANUFACTURE
SERIAL NUMBER
CONSULT INSTRUCTIONS FOR USE
MANUFACTURER
AUTHORISED REPRESENTATIVE IN THE
EUROPEAN COMMUNITY
TYPE BF APPLIED PART
CAUTION
A HANDLE DIRECTION ERROR
PREVENTION STICKER
CLASS II EQUIPMENT
KEEP DRY
FRAGILE, HANDLE, WITH CARE
REF
SN
EC REP
!

9
DHD-1 Digital Hand Dynamometer - DHD-1 Components
Copyright 2012 SAEHAN Corporation All Rights Reserved.
No portion of this manual may be reprinted or copied without the written permission of
SAEHAN Corporation.
DHD-1 Digital Hand Dynamometer
Battery
LCD
Gauge
Five
Handle Positions
(Handle shown in
position #2)
Posts Handle
(Applied Part)
Body
(Applied Part)
Guide
Handle Clip Safety Strap
#5 #1

10
DHD-1 Digital Hand Dynamometer - Technical Specifications
Technical Specifications
Model Name Digital Hand Dynamometer
Model Number DHD-1 (SH1001)
Unit of Measure U.S. pounds (lb.) or kilograms (kg)
Range 0 ~ 200 lbs. (0 ~ 90 kg)
Resolution 0.1 lb and 0.1 kg
Accuracy ± 1% of Full Scale
Expected Service Life Five Year
Power Supply Lithium-Ion Polymer Re-chargeable Battery
Warrant y One-Year Limited Warranty
Dimensions 138mm (W) X 258mm (L) X 75mm (H)
Weight 1.3 lb. (0.59 kg)
Operation Environment
a. Ambient temperature range : 10 ~ 40°C (50 ~ 104°F)
b. Relative humidity range : 30% ~ 75%
c. Atmospheric pressure range : 700hpa ~ 1,060hpa
Storage Environment
a. Ambient temperature range : 0 ~ 50°C (32 ~ 122°F)
b. Relative humidity range : 10% ~ 90%
c. Atmospheric pressure range : 700hpa ~ 1,060hpa
Altitude Considered 3000m
Protection Type and Level
Regarding Electric Impact Internally Powered Equipment, Type BF Applied part

11
DHD-1 Digital Hand Dynamometer - Battery
The DHD-1 includes a built-in Lithium Ion Polymer rechargeable battery. When
connected to a PC using the USB cable, the PC provides power to the DHD-1
and charges the battery at the same time. A fully charged battery will operate
the DHD-1 up to 43 hours before needing to be recharged, and it takes about
eight hours to fully recharge the battery. The battery charge level appears on
the upper right corner on the LCD display when operating on battery power, but
does not appear when connected to a PC for power and recharging.
The battery can be recharged many times before needing to be replaced. If the
battery quickly discharges or the charge level remains low after attempting
to fully recharge, the battery should be replaced. Contact your supplier to
arrange for replacement of the battery. Do not try to replace the built-in battery
yourself.
Note: To prolong battery life, the DHD-1 will automatically power off after
three minutes. When connected to the PC for power and charging,
the DHD-1 will not automatically power off.
Warning: Replacement of the lithium battery by inadequately trained personnel
could result in a risk of fire or explosion. Please contact your supplier
to arrange for replacement of the battery.
Battery
Product Name
Life
Time for complete charging
Time for continuous use
after discharge
Note
BK053048AH 700mA
30% of original capacity after charging 250~260 times
8 hours
Approximately 43 hours
Battery Cell (UL 1642 approved)
Battery Pack (anti-overcharge and over-discharge
circuits inside)

12
DHD-1 Digital Hand Dynamometer - Display Modes
DATE DATE
TIME
Setting Mode
Setting Month / Day - mm.dd Setting Year - yyyy
Setting Time - hh:mm

13
Testing Mode
Right hand Test Number 02 saved
Ready for next test
Right hand Test Number 03
Ready to save
Right hand Test Number 03 saved
Ready for next test
DHD-1 Digital Hand Dynamometer - Display Modes

14
AVG
Reading Mode
Time and Date for Test Number 03
AVG, SD, CV sequentially displayed
based on all 3 RIGHT hand tests
DHD-1 Digital Hand Dynamometer - Display Modes

15
DHD-1 Digital Hand Dynamometer – Grip Strength Testing Protocol
Step 1: Select the Handle Position
Set the adjustable handle to the desired position (normally position #2).
Make sure the handle clip is located at the lower post (furthest from the
gauge) and is locked securely around the post. Failure to position the
handle correctly will cause inaccurate readings.
Step 2: Placing the DHD-1 in the Patient’s Hand
While supporting the base to prevent accidental dropping, place the
DHD-1 in the patient’s hand with the safety strap around their wrist as
shown below.
Always Use
the Safety Strap
Step 3: Preparing the Patient for Testing
With the patient sitting erect, have the patient arrange the device so it fits
comfortably in their hand. The shoulder should be adducted and neutrally
rotated, and the elbow should be flexed at a 90° angle. The forearm
and wrist should be in a neutral position. Grip force should be applied
smoothly, without rapid wrenching or jerking motion. Wrist extension
from 0 to 30° is permissible as maximal grip is achieved. Wrist extension
exceeding 30° should be noted in the chart.

16
DHD-1 Digital Hand Dynamometer – Grip Strength Testing Protocol
Step 4: Documenting Results
Generally, use handle position #2 (see DHD-1 Components) and
alternately test each hand three times. Test the normal hand, followed by
the injured hand. The mean of three trials is recorded in either pounds or
kilograms (lbs. or kg).
To determine maximal effort, test each hand three times in all five handle
positions. Test the normal hand followed by the injured hand and record
the average for each hand. Repeating the tests after short rest periods
helps determine if a patient is exerting maximal effort.
If the patient has performed the tests with maximal effort, there should
be less than 10% variation in the results from the various grip positions.
Greater than 10% variation between the tests indicates the patient has not
exerted maximal effort.
For more information regarding testing procedures and results, refer to
the following literature:
Fess EE. “Grip Strength”, Clinical Assessment Recommendations, 2nd
Edition. Chicago, American Society of Hand Therapists, 1992.
Kellor M, Frost J, Silberberg N, et al. “Hand Strength and Dexterity”, The
American Journal of Occupational Therapy 1971; 25:77-83.
Mathiowetz V, Federman S, Wiemer D. “Grip and Pinch Strength: Norms
for 6 to 19 Year Olds”, The American Journal of Occupational Therapy
1986; 40:705-11.
Mathiowetz V, Kashman N, Volland G, Weber K, Dowe M, Rogers S.
“Grip and Pinch Strength: Normative Data for Adults”, Archives of
Physical Medicine Rehabilitation Vol. 66, February 1985.
(1)
(2)
(3)
(4)

17
DHD-1 Digital Hand Dynamometer – Grip Strength Testing Protocol
Schectman O, Taylor C. ‘The Use of Rapid Exchange Grip Test in
Detecting Sincerity of Effort”, Journal of Hand Therapy 2000; 13; 195-202
Firrel J, Miller G. “Which Setting of the Dynamometer Provides Maximal
Grip Strength?”, The Journal of Hand Surgery 1996; 21A:397-401.
Note: Normative data for children and adults may be found at www.saehanmedical.
com. Under the “Customer Support” tab, click on “Dataroom” and “Score
Table (Norms)” to view and download.
(5)
(6)

18
DHD-1 Digital Hand Dynamometer – Introduction
DHD-1 Introduction
The Digital Hand Dynamometer, Model DHD-1 provides digitized Grip
Strength measuring and Endurance Strength testing in real time. This device is
used to measure the dysfunction of injured hands. Test results can be displayed
in Kg (kilograms) or lb (Pounds).
The DHD-1 Digital Hand Dynamometer represents the latest electronic
technology applied to the familiar design of hydraulic hand dynamometers.
Utilizing electronic load cell transducers instead of hydraulic fluid mechanisms
that are prone to leakage; the DHD-1 is extremely durable and designed to last
for many years. Highly accurate grip strength measurement from 0-200 pounds
(lbs.) or from 0-90 kilograms (kg) is digitally displayed on the LCD and up
to 20 test results for each hand can be stored in memory. The built-in battery
is long lasting and is easily recharged when connected to a PC using the USB
cable included with the DHD-1. To transfer saved test results from the DHD-1
to a PC, see DHD-1 Digital Hand Dynamometer - Data Transfer Software
Installation and Usage beginning on page 26.
The DHD-1 has three modes of operation: Setting Mode, Testing Mode, and
Reading Mode. The buttons perform different functions depending on the
current mode of operation.
Setting Mode is used for setting the date and time. The DATE and TIME of
each test can be saved in memory with the corresponding test result.
Testing Mode is used for testing grip strength and measuring the maximum
grip force applied. Up to 20 test results for each hand can be saved in memory
and referenced by Test Number, which indicates the number of test results
stored in memory for each hand.
Reading Mode is used to display the test results for each Test Number saved
in memory. Test results include the maximum grip force (MAX), DATE and
TIME of individual tests as well as the average (AVG), standard deviation (SD),
and coefficient of variation (CV) based all tests for the selected HAND.

19
DHD-1 Digital Hand Dynamometer – Introduction
Note: When reading the following sections, refer to the Display Mode diagrams
on pages 12-14 to quickly learn the operation and button functions in
each mode, and to benefit using the many features of the DHD-1 Digital
Hand Dynamometer.

20
DHD-1 Digital Hand Dynamometer – Operation
DHD-1 Operation
Calibration
Press the PWR button to power on the DHD-1. Then press and hold the ZERO
button to calibrate the DHD-1. After two beeps, the DHD-1 is calibrated and
0.0 is displayed. The DHD-1 is extremely sensitive such that the 0.0 current
and maximum force readings on the display may increase if the handle is
reclined due to the force of gravity, or if the handle is touched after the device is
calibrated or reset.
Note: There is no difference in measured values due to unperformed zero correction
except cases such as damages of Load Cell. Though zero correction (zero
point) in advance of the measurement is not of absolute necessity, make
measurement after executing electric zero correction (with “ZERO”
button) if possible.
Reset
Press inside the hole to the left of the LCD screen with a small pin or paperclip
to reset the DHD-1. The firmware version is displayed and the calibration reset
to 0.0. Saved test results are not erased. However, the Month/Day, Year, and
Hour/Minute settings are erased. See Setting Mode instructions for setting the
Month/Day, Year, and Hour/Minute.