ARROWELD ARW-DPIT Touch User manual

Instruction Manual
ARW-DPIT Touch
AS, 02.12.2010 DPIT GB Page 1 of 13
ARROWELD ITALIA Spa
Via M. Pasubio, 137
36010 Zanè (VI)-(Italia)
Tel [phone]
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E-mail:[e-mail]
HMO LEEB IMPACT HARDNESS TESTER
Table of contents
Caution
1. Summarize
1.1 Measuring principle scope
1.2. The Hardness value “L”
1.3 Main features
1.4 Application range
1.5 Technical information
1.5.1 Display unit
1.5.2 Impact unit D
1.6 Overview the Display unit
2. Checking supplied accessories
3. Quick start guide
3.1 Connection
3.2 Charge the battery
3.3 Calibration
4. Operating instructions
4.1 Display unit
4.1.1 Keyboard description
4.1.2 Measuring mode
4.1.3 Adjusting the LCD contrast manually
4.2 Using the Menu
4.2.1 Testing Setup
4.2.1.1 Material group
4.2.1.2 Impact direction
4.2.1.3 Conversion
4.2.1.4 Limit values
4.2.1.5 Statistics
4.2.2 Printing Setup
4.2.2.1 Items
4.2.2.2 Print Memory
4.2.2.3 Print all
4.2.3 Memory management
4.2.3.1 The Format of Memory data
4.2.3.2 Data Browser mode
4.2.3.3 Delete Memory Data
4.2.4 System setting
4.2.4.1 System function switch
4.2.4.2 Language
4.2.4.3 Date/ Time
4.2.5 Calibration
4.2.5.1 HL Calibration
4.2.5.2 Touch Calibration
4.3 Charging
4.4 Backlight
4.5 Reset
4.6 Automatic Shutdown
5. Data Printing
5.1 Printer Link
5.2 Infrared Printing
5.3 Test Report Format
5.4 Test Report Printing
5.4.1 Automatic Printing
5.4.2 Manual Printing
5.4.3 Assemble Printing
5.4.4 Other Printing ways
6. Hardness Test
6.1 Test preparation
6.2 Sample preparation
7. Test Steps
8. Troubles and solutions
9. Maintenance and Service
9.1 Impact Device maintenance
9.2 Storage of the report
9.3 Normal Maintenance procedures
9.4 Service
Appendix 1 Daily Checking
Appendix 2 Factors affecting the Accuracy
Appendix 3 Measuring and Conversion Range
Appendix 4 Material Code
10. Declaration of conformity
Caution
Please carefully read this first:
1. Only the special battery and provided power adapter
may be used for the hardness tester. Otherwise it may
cause damages to the product i.e. battery leakage, even
fire or explosions.
2. Any components of the hardness tester may not be
submerged into water or exposed to rain which could
cause a battery explosion and the instrument might be
damaged.
3. To avoid electrical shocks, the housing may not be
opened.
4. If the instrument isn’t used for a longer period, it has to
be stored in a cool and dry place after fully charging it once
a year. This serves to maintain the battery functions.
1. Summarize
1.1 Measuring principle scope

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The measuring principle of DPIT Hardness Tester is
physically a rather simple dynamic hardness test:
An impact body with a hard metal test tip is propelled by
spring force against the surface of the test piece. Surface
deformation takes place when the impact body hits the test
surface, which results in a loss of kinetic energy. This
energy loss is calculated by velocity measurements when
the impact body is at a precise distance from the surface
for both, the impact phase and the rebound phase, of the
test. The permanent magnet in the impact body generates
an induction voltage in the single coil of the impact device.
The voltage of the signal is proportional to the velocity of
the impact body. A signal processing by the electronics
provides the hardness reading for display and storage.
Simply said, harder materials produce higher rebound
velocities than less harder ones (higher L- value).
DPIT Hardness Tester provides a direct hardness
measurement within any particular material group (i.e.
steel, aluminium etc.). It can be used as a final test result
without conversion. However, there are established
conversions to other hardness scales in this Hardness
Tester as a comfort for our customers. These conversions
to other scales (HRC, HRB, HB, HV, HSD etc.) are
programmed into the electronics and they can be shown
directly on the display as a test result. All data is stored in
the native L scale to prevent any possible errors with
multiple conversions.
1.2. The Hardness value “L”
This term was introduced 1978 into measuring technology
by Dr. Dietmar Leeb. It contains the quotient for the impact
body’s rebound and impact velocity, multiplied by 1000.
Harder materials produce higher rebound velocity than
less harder ones. With reference to a particular material
group (i.e. steel, aluminium etc.), the L value represents a
direct hardness measurement and is used as such.
Comparison curves with other standard statistic hardness
values have been established (Brinell, Vickers, Rockwell
C, B) for the most prevalent materials, enabling the
L values to be converted into the relevant values by these
procedures. With this hardness tester, such hardness
values can directly be displayed in the hardness scales
HRC, HRB, HB, HV, HSD and tensile strength (MPa).
1.3 Main features
- Highly accurate, ± 6 HL
- Automatic correction for impact direction
- Large, easy to read display with backlight
- User profiles for fast change of all settings
- Operation with Touch Screen
- Large memory with on- screen review of data
- Conversion to all common hardness scales
HRC, HRB, HB, HV, HSD and tensile strength
(MPa).
- Rechargeable Li- ion batteries
- Conforms to the standard ASTM A956-02
1.4 Application range
- Appropriate for all metals
- Ideal for production level testing
- Best suited for on- site testing of heavy, big or
already installed parts
- Handy for difficult to access or confined test
locations
- Automatic compensation for impact direction
- Excellent for material selection and acceptance
tests
- Easy to handle and accurate on curved test
surfaces (R> 10mm)
- Metal production & processing
- Automotive & transportation
- Aerospace & shipyard
- Testing services & laboratories
1.5 Technical information
1.5.1 Display unit
HL Display Range: 0 ~ 1000 HL
Accuracy: ± 6 HL
Display of the main body: large LCD with
adjustable contrast, backlight, Touch Screen
Unit Material: shock resistant ABS plastic
Internal Data Storage : ~ 800 measured values
• Resolution: 1 HL; 1 HV; 1 HB; 0,1 HRC;
0,1HRB; 1 HSD; 1 MPa
• Battery type: rechargeable Li- Ion
• Operating temperature: 0°C up to + 50°C
(32°F up to 122°F)
• Storage Temperature: -10°C up to + 60°C
(14°F up to 140°F)
• Humidity: 90 % max.
• Dimension: 135 x 83 x 24mm
(5.3 x 3.2 x 0.9 inches)
• Weight: 228 g
1.5.2 Impact unit D
Impact energy: 11 Nmm
Mass of the impact body: 5.5 g
Test tip diameter: 3 mm
Test tip material: tungsten carbide
Test tip hardness: ≥ 1600 HV
Impact length: 147 mm
Impact maximum diameter: 20 mm
Impact weight: 75 g

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1.6 Overview the Display unit
2. Checking supplied accessories
It should be checked that the following accessories are
supplied with your instrument (Fig. 2.1):
3. Quick start guide
3.1 Connection
The signal cable is used to connect the impact sensor and
the display unit.
Picture 3-1
3.2 Charge the battery
The battery (in the display unit) has to be charged before
the first use of the Impact Hardness Tester.
3.3 Calibration
The test block has been calibrated in accordance with the
dynamic hardness value L. The DPIT Impact Hardness
Tester has to be calibrated by the test block before the first
use.
4. Operating instructions
4.1 Display unit
4.1.1 Keyboard description
The Power on/off button has to be pressed to turn on the
instrument. In any case, this button can be pressed again
for one second to turn it off.
Note: During the instrument is charging, it may not be
turned off, because the Tester is on a supervision
mode.
4.1.2 Measuring mode
1. Impact unit type
2. Material group
3. Battery remaining indicator
4. Hardness value L
5. Impact direction
6. Conversion value
7. Statistic values
8. Statistic times value: The impact times in a statistic data
group
9. Impact times counter
10. Time and date
11. Print current date
12. Adjustment of the contrast of LCD
Note: When “---“ appears at this position, it is
indicated that conversion is out of range.
Picture 4-1
4.1.3 Adjusting the LCD contrast manually
Due to the use of different ambient temperatures and light
conditions, it is necessary to adjust the contrast of the LCD
for a better observing and reading of data.
If “A” area is clicked, the dialog box which adjusts the
contrast of the LCD, can be opened (see picture 4-2).
Then it has to be clicked directly to “Contrast Adjustment”
and the contrast can be adjusted on the touch screen.
After this is achieved, “A” area has to be clicked to confirm
the contrast and to close this dialog box.
If there is no operation within 3 seconds during the dialog
box is opened, it will close automatically. After adjusting
the contrast, it will be stored to its original state as long as
“A” area isn’t clicked again for the next current operation.
4.2 Using the Menu
HMO Impact Hardness Tester selects the Multistage Menu
Mode, as shown in picture 4-3. In Measuring Mode, MENU
has to be clicked on the screen to display the menu.

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MENU:
Picture 4-4
Picture 4-4 contains six options:
Testing Setup, Printing Setup, Memory Management,
System Setting, Calibration and Information.
4.2.1 Testing Setup
Picture 4-5
Testing Setup item has to be clicked in Menu Mode to
display the Testing Setup Menu.
This Menu contains five selectable items:
Material Group, Impact Direction, Conversion, Limit Values
and Statistic.
4.2.1.1 Material group
Picture 4-6
Picture 4-7
In Measuring Mode, the touch pen has to be used to click
the “Material Group” to select the desired material.
When the “Conversion” is set to hardness scale
(see picture 4-6) and it is clicked on “Material Group”
continuously, the material changes according to following
sequence:
Steel & Cast Steel→ Alloy Tool Steel→ Stainless Steel→
Grey Cast Iron→Ductile Iron→Cast Alloys→Brass
→Bronze→Copper→Forging Steel→Steel & Cast Steel..
When the “Conversion” is set to MPa (tensile strength),
(see picture 4-7) and if it is clicked on “Material Group”
continuously, the material changes according to following
sequence:
Low Carbon Steel→Hi Carbon Steel→Chrome Steel→
Cr-V Steel→Cr-Ni Steel→Cr- Mo Steel→Cr-Ni-Mo
Steel→Cr-Mn-Mo Steel→Cr-Mn-Si Steel→Hi Strength
Steel→Stainless Steel→Low Carbon Steel…
It has to be clicked onto the desired material with the touch
pen to select the material. With or it has to be
scrolled up and down. To get to the upper menu, it has to
be clicked “Back”.
Note: 1. It is necessary to select the material
classification. If the type of material isn’t known, the
handbook will provide assistance.
2. If the material group has been changed, the impact
times counter will be set to “0”.
4.2.1.2 Impact direction
In measurement mode, the touch pen is used to click to
“Impact direction” logo to set the desired impact direction.
If it is clicked continuously on that logo, the impact
direction changes according to following sequence:
The desired position has to be chosen and clicked.
Picture 4-8
4.2.1.3 Conversion
In measurement mode, the touch pen has to used to click
on “Conversion” logo to select the desired hardness scale
or tensile strength. By clicking continuously on that logo,
the conversion changes according to following sequence:

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ARW-DPIT Touch
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Picture 4-9
In Conversion Menu, the desired hardness scale or tensile
strength has to be clicked to select to select the hardness
scale or tensile strength.
Note: 1. If the conversion is set from hardness scale to
tensile strength, the material group has to be reset.
2. The conversion value only supplies a general
reference, which results in some offset. Generally,
comparative tests are necessary to achieve precise
conversion.
3. Standard setting for the conversion is “HRC”.
4.2.1.4 Limit values
When the measured value “L” is out of the limit value
range, the display unit will alarm and send out a prompt.
In Testing Setup Menu, Limit Values item has to be clicked
to display the Limit Values Setup Menu. The Limit Values
have to be set by a click on the screen control panel.
OK has to be clicked to confirm the Limit Values Setup.
Click back to cancel the Limit Values Setup.
Click to select a desired bit.
Picture 4-10
4.2.1.5 Statistics
HMO Impact Hardness Tester has got an automatic
statistic function. If the impact times are up to the Statistic
Times Value, value ( the mean value of the measured
hardness value L) and „S“ value (the difference of the max.
value and the min. value) are automatically formed and
displayed on the screen. In Measurement Mode, “Statistic “
item has to be clicked with the touch pen to display the
Statistic Times Value setup menu; or in Testing Setup
Menu, “Statistic “ item has to be clicked to display the
Statistic Times Value setup menu (see picture 4-11).
The Statistic Times Value has to be set by a click on the
screen and then OK has to be clicked.
Click OK again to confirm the Statistic Times Value entry.
Click BACK to cancel the procedure.
Click to increase or decrease the Statistic Times
Value.
Picture 4-11
Note: 1. The Statistic Times Value range is 1~99. If this
value is set to 1, the system has got no Statistic
process.
2. When this value has been reset, the impact times’
counter will start counting from “0”.
4.2.2 Printing Setup
With the Micro- printer it is possible to print out the
measured values in many formats. In Menu Mode, Printing
Setup has to be clicked to display the Printing Setup Menu
(see picture 4-12). There are three options in this menu:
Items, Print Memory and Print All.
4.2.2.1 Items
A complete test result report should include: measured
values, conversion values, date, time, impact direction,
statistic value, material etc. The printing items can be
chosen in this menu. There are five options in this menu:
Date, Time, Direction, Mean Value and Material (see 4-12)
In Items Menu, the desired item has to be clicked to
display its Function Switch.
“ON” or “OFF” has to be clicked to confirm the choice.
“BACK” or “X” has to be clicked to return to the upper
menu.
Picture 4-12
4.2.2.2 Print Memory
The measured values and related items can be printed by
means of this menu. In Printing Setup Menu, Print Memory
item has to be clicked with the touch pen to display the
Serial No. Range menu (see picture 4-13).
The printing range has to be set by a click on the screen
control panel (click to select a desired bit). Then OK
has to be clicked to display the Confirm Menu.
Click “YES” to confirm printing or “NO” to cancel printing.

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“BACK” or “X” has to be clicked to return to the upper
menu.
4.2.2.3 Print all
With this menu, all the measured data in memory can be
printed by the following steps:
In Printing Setup Menu, the touch pen has to be clicked on
Print All item to display the Confirm Menu,
see picture 4-14 below.
Picture 4-14
The touch pen is used to click “YES” to confirm printing or
with “NO” printing will be cancelled. With “BACK” or “X”
printing is cancelled and it is returned back to the upper
menu.
Note: HMP Impact Hardness tester can save about 800
data in memory. It will take a very long time to print
out all data in memory.
4.2.3 Memory management
In this menu, it is possible to browse and delete the
memory data, simultaneously the memory data can also
be printed out.
In Menu Mode, Memory Management item has to be
clicked to display Memory Management Menu (see 4-15).
There are five options in this menu:
Browse A to Z, Browse Z to A, Browse Selected, Delete
Selected and Delete All.
Picture 4-15
4.2.3.1 The Format of Memory data
The data group, such as test result, conversion result,
sample material and impact direction, are automatically
saved in memory after each measurement. The format of
memory data is shown in picture 4-16:
4.2.3.2 Data Browser mode
This tester includes three browser modes: Browse A to Z,
Browse Z to A and Browse Selected.
It has to be clicked directly onto Memory Management
Menu to display the relevant Data Browse Menu. If
“Browse A to Z” item is selected, the menu is shown in
picture 4-15.
In this menu it has to be clicked to page up, to
page down, to delete a selected group of data. It has to
be clicked to print a selected group of data.
By clicking OK the test time of a selected group of data will
be demonstrated. If “Browse Z to A” item has been
selected, the menu is shown in picture 4-17.
It has to be clicked to page up and to page down,
to delete a selected group of data. It has to be clicked
to print a selected group of data. By clicking OK the
test time of a selected group of data will be demonstrated.
If Browse Selected item is desired, the serial No. range of
the group of data stored in memory can be selected. This
menu is shown in picture 4-18. In this menu, the input
method is the same as in Print Memory, please refer to
4.2.2.2. If the serial No. input is finished, OK has to be
clicked to browse the selected group of data (see 4-19).
It has to be clicked to page up and to page down,
to delete a selected group of data. It has to be clicked
to print a selected group of data. By clicking OK the
test time of a selected group of data will be demonstrated.

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Picture 4-18 Picture 4-19
4.2.3.3 Delete Memory Data
There are three ways to delete memory data:
1. Delete Memory Data in Data Browser Menu,
refer to 4.2.3.2.
2. Delete Selected: In Memory Management menu, Delete
Selected item has to be clicked to display the Serial No.
Range menu (see 4-20).In Serial No. Range menu, the
desired range to delete has to be input. Then OK has to be
clicked on the screen to display the Confirm Menu. The
touch pen is used to click “YES” or OK to confirm deletion
or “NO” to cancel deletion. With “BACK” or “X” deletion is
cancelled and returned back to the upper menu.
Picture 4-20
Note: If the input range is out the Serial No. range, the
actual data group will be deleted in the input range
and in memory data sequence the number will be
arranged.
Picture 4-21
3. Delete All: This operation will delete all data in memory.
To do this, in Memory Management it has to be clicked
onto Delete All item to display the Confirm Menu
(see 4-21). Click “YES” or OK to confirm deletion.
Click “NO” to cancel deletion.
With “BACK” or “X” deletion is cancelled and returned back
to the upper menu.
4.2.4 System setting
System setting contains some system function switches.
Various switching functions can be setup according to the
users’ requirements, such as the adjustment of system
calendar and clock.
In Menu Mode, System Setting item has to be clicked on
the screen to display System Setting Menu. There it can
be set for the corresponding switches to turn into the
windows of system setting calendar and clock.
By clicking “BACK”, it will be returned to the upper menu.
4.2.4.1 System function switch
Four functions can be setup on the System Setting Menu:
Auto Print, Gross Error, Key Sound (Alarm), Language.
Picture 4-22
The function-setting window can be opened by pressing
the button to choose relative operation options. This item
has to be clicked to conduct function-setting (see 4-22).
It can be chosen to turn this function on or not. It has to be
clicked directly ON or OFF to confirm the amendment.
Operation can be cancelled by clicking “BACK” or “X” on
the screen.
If Auto Print is set at “ON”, the data will be printed
automatically after the data measurement is finished.
If Gross Error is set at “ON”, gross errors will be shown
according to Grubbs criteria as the Statistic Times Values
have been completed, see picture below:
Picture 4-23
Deletion can be conducted by clicking (please refer to
4.2.3.3). When data have been deleted without
supplementary measurements taken, it can be clicked OK
to confirm the end of the measurement and be ready for
the next one. If supplementary point’s measurement is
needed, it has to be clicked BACK to get to the
Measurement Mode window and then perform supplement.
When Key sound is set at “ON”, the buzzer will shortly
beep once, if effective icons are clicked on the touch
screen.
When Alarm is set at “ON”, the buzzer will continuously
beep twice, if the measured value is out of the limit values
or if a gross error appeared.

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4.2.4.2 Language
In System Setting menu, Language item has to be clicked
to display the Language Setup menu (see 4-24). It has to
be clicked “EN” (English), then OK for the English menu
(or CH for the Chinese menu).
4.2.4.3 Date/ Time
IN System Setting Menu, it has to be clicked directly on
Date/Time item to display the Date/Time setup menu.
Picture 4-25
By clicking on the button on the screen, setting contents
can be chosen (year/ month/ date/ hour/ second).
4.2.5 Calibration
Calibration contains the HL Calibration and the Touch
Calibration.
HL Calibration is used to calibrate the measured value
(HL) of the hardness tester up to the farthest decrease
measuring error.
Touch Calibration is used to calibrate the accuracy of the
touch screen position to provide a correct and fast
operation of the touch screen itself.
In System Setting menu, calibration has to be selected and
clicked upon to enter the calibration screen,
see picture 4-26:
4.2.5.1 HL Calibration
There are two possibilities to get into this menu:
In Calibration menu, it has to be clicked OK on the screen
to display the HL Calibration menu; or it has to be clicked
directly on HL Calibration item in Calibration menu to
display the HL Calibration.
Picture 4-27
Five effective impact tests have to be carried out on the
test block (if the number of impact times is less than five,
OK has to be clicked and an alarm prompt will be
displayed, indicating that there is an operation error). The
measured values are displayed on the screen (the wrong
ones can be deleted and it can be measured again) (see
picture 4-28), then it has to be clicked “BACK” to get back
to the HL Calibration menu.
The mean value gets automatically formed after five
measurements taken.
The HLD value which is marked on the test block, has to
be input by clicking on the screen keyboard. Then, by
clicking OK, the HL Calibration is finished.
Picture 4-28
Note: If the Impact Hardness Tester is used for the first
time or if it hasn’t been used for a longer period, it
should be calibrated by using the test block.
The standard impact direction is downward (see
Appendix 1 in details).
4.2.5.2 Touch Calibration
Touch Calibration is actually used to calibrate the
consistency between Touch Screen sensor and LCD
coordinates. If there is a deviation existing between the
actual position of touch screen pressing and the actual
position of the pressed figures displayed on LCD, Touch
Calibration should be performed.
The coordinates of this Hardness Tester have been
carefully calibrated when it was launched.
Coordinate errors may appear during the process of use
due to the change of environmental conditions (especially
notable changes in temperature and humidity).
Small errors can be corrected well on this function.
Picture 4-29

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Picture 4-30
The cross center can be clicked with the touch pen for
Step 1 to Step 3, as shown in picture 4-30. After
completing the above three Stepps, a rectangular frame
will be automatically displayed in the middle of the window,
see Picture 4-31:
The core of the rectangular frame has to be clicked with
the touch pen and the system automatically returns to the
window of calibration. Now Touch Calibration is finished.
If it isn’t possible to return to the window of Calibration, the
operation was inefficient. The core of rectangular frame
has to be re-clicked (three times at most). If it is still
inefficient after three times, it will automatically return to
the window shown in Picture 4-30 (step 1). All the steps
of Touch Calibration should be restarted until it is
performed successfully.
4.3 Charging
The batteries have to be charged before the first use and,
during use, if exhaustion of electricity arises.
The capacity of battery is shown as full with three columns
filled and it is shown as empty with no column is filled. The
word “Power Shortage” will appear and the buzzer will
beep once in two seconds to tell that it is time to charge.
First, the USB plug of the charger has to be inserted into
the right USB jack of the display unit, see Picture 4-33:
Then the charger has to be connected with the AC socket
(220V/ 50Hz) to start charging (see 4-34). If the machine is
at the turn-off state, charging machine will be automatically
switched on and the battery symbols will be shown.
At the end of charging, “charging complete” appears on the
screen. If now the ON/OFF button is pressed, the
instrument won’t be turned off because it is on a
supervision mode.
Note: Only the exclusive charger may be used for the
HMP Impact Hardness Tester!
4.4 Backlight
The LED backlight is used for poor light conditions. It can
be automatically opened if the instrument is turned on. If
there is no measurement and no touch screen operation,
the backlight will be closed to save power. It will reboot as
soon as a measurement is performed or any touch screen
operation is done.
5. Reset
If the display unit isn’t in order or if it halts during the
process of use, the Reset button can be pressed by
inserting a slender rod into the Reset hole at the right side
of the display unit. Then the instrument will restart.
4.6 Automatic Shutdown
The instrument will automatically shutdown in the following
two cases in order to save battery power. All the
parameters will be stored before turning off:
1. If there is no measurement performed and no touch
operation within 3 minutes, the display unit will
automatically switch off. It will beep continuously in 10
seconds before shutdown.
2. When the battery power is not sufficient, it will be
displayed “power shortage”, and the buzzer will beep once
a second. The display unit will automatically switch off after
10 seconds.
5. Data Printing
HMO Impact Hardness Tester can be linked with the
exclusive micro printer to print out the measured values.
The micro printer can be acquired as an optional device.
5.1 Printer Link
If the power of the display unit is switched off, the USB
plugs of the printer cable (optional) have to be inserted into
the USB jack for the printer on the right side of the display
unit. The other side of the cable has to be inserted into the
socket on the left side of the printer to connect both parts.
Picture 5-1
Now the printer can be booted by pressing the Power
button on the printer. Then the display unit has to be
turned on. Other printer operations involving printer power
connecting or power recharging are attached in the printer
instruction manual.
5.2 Infrared Printing
The display unit’s infrared launch window has to be put at
the level of printer’s infrared receive window. In this way,
infrared print can be used like serial print.

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Note: When the serial cable is used to print, the
infrared printing way is not possible to apply at the
same time. If it is done nevertheless, the printer will
print an unrecognizable code; even the paper will be
non-stop output from the printer.
5.3 Test report Format
A complete test report is shown in following picture:
Picture 5-3
5.4 Test Report Printing
HMO Impact Hardness Tester offers various typing ways.
The way of typing can be flexibly chosen in the actual use.
5.4.1 Automatic Printing
If Auto Print is set to ON, the printer can automatically print
during the measuring process. The data will be sent out to
the printer a group of test data is completed. The title of
the report will be printed before the beginning of each
group of data. If Statistic Times Values is set at 1, the
printer doesn’t print automatically. If this item is set at
2 to 99, the printer will automatically print the statistic
group.
Note: If Auto Print is set to ON and if material, Statistic
Times Values or Conversion have been changed, the
printer will print out all the finished test values.
5.4.2 Manual Printing
If Auto Print is set to OFF, the printer can be operated
manually. Manually printing can be devided in two types:
1. “Statistic Times Values” is set to 1
After every time of impact the measured values can be
printed out by clicking on (in measuring mode).
The printer will automatically print the information in the
title part as soon as printing starts.
2. Statistic Times Values is set at 2 to 99
If the impact times are up to user’s Statistic Times Values,
has to be clicked and all the measured values and
statistic results in that group will be printed out. A complete
test report is formed. If is clicked before the impact
times are up to the Statistic Times Values, all the finished
test values will be printed. Then, if the impact times are up
to user’s Statistic Times Values, has to be clicked
again and the rest data and statistic results can be printed
to get a complete test report.
5.4.3 Assemble Printing
Instead of printing the report during the test, it is possible
to print the measured values in Printing Setup menu (see
4.2.2.2 Print Memory and 4.2.2.3 Print All).
5.4.4 Other Printing ways
It can be printed when browsing some data management
pages (see 4.2.3.2 Data Browser Mode). It is also possible
to print in the window of statistic list (see 4.2.4.1).
The symbol will be shown on the screen if these
printing ways are available.
Note: 1. Statistic results are only shown at the ending
part of the test report when automatic and manual
printing ways of the Statistic Times Values are set at
2 to 99.
2. Date and time in test reports are showing the actual
printing time. They don’t refer to the test dates and
times.
3. Thermal printing paper should be stored in a place
without high temperature and strong light. In case if
storage is necessary, the copies should be stored.
6. Hardness Test
6.1 Test preparation
a) It should be reassured that the system is safe and
reliable.
b) The instrument has to be switched on and it has to be
checked if charging is necessary.
It has to be checked if every setting of the display unit is
correct, particularly material and impact direction. A setting
which doesn’t conform with the actual conditions may
cause a great error.
6.2 Sample preparation
Inappropriate samples will cause great measurement
errors. Therefore, preparation and handling should be
performed on original conditions of the sample.
Preparation of the sample and the surface to test should
be coincident with the following basic requirements:
1) A thermal or cold processing of the impact sensors
during the process of sample preparation should be
avoided.
2) The surface of the sample should be plane, with a
metallic sheen, and not involve oxide layer or other stains.
3) Roughness of the test surface: Ra≤ 1.6
4) The sample has to be of sufficient quality and rigidity.
Otherwise displacements or shaking during the test might
happen. These could also lead to measurement errors.
A sample quality of ≥ 5 kg can be directly tested. If the
sample quality is 2~5 kg, it should be fixed before the test
by appropriate clamps. If the sample quality is 0.05~2 kg, it

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should be coupled before the test; if it is < 0.05 kg, this
hardness tester is inappropriate to use.
Coupling method: The testing sample’s back should be
plane as well as the surface of the supporting object.
A little coupling substance (i.e. Industry Vaseline) has to
be filled between the two components. Then the two parts
have to be pressed together. If the weight of the supporting
object is more than 5 kg, it can be replaced by the test
block.
5) Samples should be thick enough with sufficient layered
surface. If the D-type of impact sensor is used, the
thickness of the sample should be less than 5 mm and the
surface absorption layer (surface- hardening layer) should
not be less than 0.8 mm. To perform accurate hardness
measurements, the best way is to remove this layer before
testing.
6) If the testing sample surface isn’t horizontal and flat, the
curvature radius of the testing and nearby surface should
be larger than 30 mm. An appropriate supporting ring has
to be selected and installed.
7) A sample should not be magnetic. The signal of the
impact sensor would be seriously affected, which might
cause inaccurate test results.
7. Test Steps
How to perform the Hardness Test:
Accurate measurements are achieved by simple operating
elements, even for occasional users.
1) Loading:
The loading tube has to be slided forward to load the
impact device.
2) Placing:
The impact device has to be placed and held on the
surface of the test piece at the desired test point.
3) Measuring:
The trigger button has to be pressed to trigger the impact
device. The hardness value will be immediately displayed.
4) Reading the test result
A long operating life is provided by modern electronics with
power saving features. The large LCD display always
shows how DPIT Impact Hardness Tester is configured to
the tests. Variable function screen allows a quick change
of common test parameters. On the screen hint line the
other active control keys are positioned. No subjective
measuring errors are possible, highly repeatable results
are given to the user. Reliable test results are assured by
internal self diagnostics with error messages.
Readings can be stored automatically in the internal
memory or can be directly sent to a printer.
Tests in more points can be carried out by repeating the
above steps 1 to 4.
Note: Generally, each measurement location is
conducted for 5 tests. The “S” value (difference of
max. value and the min. value) values must be less
than 15 HL. The distance between any two impact
positions should be ≥ 3 mm; the distance between the
impact position and the edge of the test piece should
also be ≥ 3 mm.
8. Troubles and solutions
9. Maintenance and Service
9.1 Impact Device maintenance
After 1000- 2000 times use, the impact device and the
impact body should be cleaned with a nylon brush. The
screw of the supporting ring has to be turned off before the
catheter can be cleaned. Then the impact body has to be
taken out and it has to be rotated into the tube with the
nylon brush in anti-clockwise direction. The brush has to
be pulled out when touching the bottom.This procedure
has to be repeated several times. Then the impact body
has to be loaded and the supporting ring reinstalled. The
impact body should be released after use. The use of any
lubricant is banned.

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9.2 Storage of the report
Printing paper is thermal paper and it should be preserved
to avoid heat and direct light. If the print records are
necessary to be kept in long-term conservation, they
should be copied and preserved in time.
9.3 Normal Maintenance procedures
If the error is larger than 12HLD by calibrating the
hardness tester, the steel ball or the impact body has to be
renewed. Those parts may be worn out and this may lead
to failure in operation.
In case if any other abnormal phenomena occur to the
Hardness Tester, it should not be either demolished or any
fixed assembly parts may not be adjusted. Instead, the
warranty card has to be completed and the Hardness
Tester has to be sent to our Maintenance department.
We will care for a prompt checking and if necessary, repair
of the device.
9.4 Service
In the following cases free maintenance is not warranted,
but maintenance service is, of course, available:
1) If the device is not used in accordance to the Instruction
Manual, if it has been connected or protected in the wrong
way and if this leads to a damage.
2) Beyond the warranty period.
3) The Serial No. of product warranty card is not identical
with the product itself.
4) Machinery parts have been disassembled or repaired by
non-authorized agency or non-professional staff.
5) The parts are not in warranty (steel ball, sensor wires,
frames, supporting ring components…)
6) Unexpected factors or human actions have been
affecting damages, such as the use of a non-exclusive
charger, high temperature, influent water, mechanical
destruction and crash etc.
7) Products are damaged as a result of transportation and
handling.
8) Irresistible force like earthquake and fire causing
product failures.
Appendix 1 Daily Checking
The test block is mainly used to calibrate the Hardness
Tester. The error and repeatability of it should be in the
scope defined in following table:
Note:
HLD is the mean value of 5 Leeb Hardness values
measured on the test block.
HLD is the value marked on the test block.
is the maximum value of 5 Leeb Hardness values
measured on the test block.
ist he minimum value of 5 Leeb Hardness values
measured on the test block.
Appendix 2 Factors affecting the Accuracy
Incorrect operation or improper testing conditions can
seriously affect the accuracy. The following factors are the
main accounts in lack of accuracy:
1) Roughness of sample surface
When the impact body impacts on the sample, a small pit
will arise on the surface of it. The less roughness, the less
consumption of impact energy is needed. According to
this, the roughness of the surface should be Ra≤ 1.6.
2) The shape of the sample surface
Leeb testing principle demands that the velocity of rebound
and impact are on the same line, because the impact body
is moving in a metal tube. Of course, hardness can also be
shown if the velocity of rebound and impact are not on the
same line. In this case, the impact body would collide with
the tube wall when it rebounds, which will affect the
velocity of rebound. This will cause an error on test
accuracy. If the radius of curvature of the sample surface
is smaller, a suitable variant supporting circle has to be
used. We can contribute to design and release those
supporting circles, if needed.
3) The weight of the sample
If the weight of the sample is more than or equal to 5 kg,
testing can be directly started. If it is less than 5 kg, the
sample needs a special charge. The supporting piece has
to be coupled by a coupling medium and pressed onto the
surface of the test piece. By doing this, better test results
will be achieved.
The area of the testing points should be free of vibrations
or shaking. If the weight of the sample is not enough,
supporting, coupling and compressing must be increased
to avoid jitter and sloshing. Shocks should be avoided.
4) The sample stability
Any effective tests need to minimize possible interference
from outside. This is very important for dynamic
measurements, such as Leeb Hardness testing.
Therefore, measurements are only allowed in a stable
hardness testing system.

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Appendix 3 Measuring and Conversion Range
Appendix 4 Material Code
DESIGNED IN REGARD TO THESE STANDARDS:
ASTM A956
DIN 50156