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MITECH CO., LTD.
www.mitech-ndt.com
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CONTENTS
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1 Overview................................................................................................................................................................. 3
1.1 Advantages...................................................................................................................................................3
1.2 Main Application &Testing Range.............................................................................................................3
1.2.1 Main Application....................................................................................................................................... 3
1.2.2 Testing Range...........................................................................................................................................3
1.3 Configuration................................................................................................................................................4
1.4 Working Conditions.....................................................................................................................................4
1.5 Safety Instructions.......................................................................................................................................4
2 Structure Feature &Testing Principle............................................................................................................. 5
2.1 Structure Feature........................................................................................................................................ 5
2.1.1 The Hardness Tester Appearance........................................................................................................ 5
2.1.2 Parts of the Main body............................................................................................................................ 5
2.1.3 D Type Impact Device.............................................................................................................................6
2.1.4 Different Types of Impact Device.......................................................................................................... 6
2.2 Leeb Hardness Testing Principle.............................................................................................................. 6
3 Technical Specifications.................................................................................................................................... 6
4 Preparation & Testing..........................................................................................................................................8
4.1 Preparation & Inspection before Testing................................................................................................. 8
4.1.1Preparation of Sample Surface.............................................................................................................. 8
4.1.2 System Setting......................................................................................................................................... 8
4.1.3Presetting Testing condition.................................................................................................................... 8
4.2 Testing Program.......................................................................................................................................... 8
4.2.1 Start-Up..................................................................................................................................................... 8
4.2.2 Loading......................................................................................................................................................9
4.2.3 Localization............................................................................................................................................... 9
4.2.4 Testing........................................................................................................................................................9
4.2.5 Read measured value.............................................................................................................................9
4.2.6 Power Off................................................................................................................................................ 10
5 Advice....................................................................................................................................................................10
6 Operation in Details...........................................................................................................................................10
6.1 Power On....................................................................................................................................................10
6.2 Power Off....................................................................................................................................................10
6.3 Testing.........................................................................................................................................................10
6.3.1 Instruction of the Main Display Interface............................................................................................11
6.3.2 Testing Operation at the Main Display Interface...............................................................................11
6.3.3 Key Operation at the Main Display Interface.................................................................................... 11
6.4 Menu Structure.......................................................................................................................................... 11
6.5 Test Set....................................................................................................................................................... 13
6.6 Print Function.............................................................................................................................................15
6.7.Memory Manager......................................................................................................................................15
6.8 Browsing Memory Data Groups............................................................................................................. 17
6.9 System Set.................................................................................................................................................18
6.10 Software Information..............................................................................................................................19
6.11 System Calibration..................................................................................................................................19
6.12 EL Background Light..............................................................................................................................20
6.13 Auto Power Off........................................................................................................................................ 20
6.14 Paper Loading......................................................................................................................................... 20
6.15 Battery Charge........................................................................................................................................ 20
6.16 Battery Replacement..............................................................................................................................21
6.17 Connection of Data Transmission Cable............................................................................................ 21
7 Fault Analysis & Evacuation...........................................................................................................................21
8 Servicing & Maintenance................................................................................................................................. 21
8.1 Impact Device Servicing.......................................................................................................................... 21
8.2 Normal Maintenance Program................................................................................................................21
9 Calibration............................................................................................................................................................21
10 Notice of Transport and Storage Conditions........................................................................................... 21
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APPENDIX................................................................................................................................................................22
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Table 1............................................................................................................................................................... 22
Table 2............................................................................................................................................................. 23
Table 3............................................................................................................................................................. 24
Table 4............................................................................................................................................................. 25
User Notes............................................................................................................................................................... 26
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1 Overview
Wide measuring range. Based on the principle of Leeb hardness testing theory. It can measure the
Large screen(128×64 dot matrix LCD), showing all functions and parameters.
Test at any angle, even upside down.
Direct display of hardness scales HRB, HRC, HRA, HV, HB, HS, HL.
Seven impact devices are available for special application. Automatically identify the type of impact
Large capacity memory could store 500 groups (Relative to average times32 ～ 1 ) information
Upper and lower limit can be preset. It will alarm automatically when the result value exceeding the
Battery information indicates the rest capacity of the battery and the charge status.
User calibration function.
Software to connect with PC via USB port.
With EL background light.
Thermal printer integrated, convenient for in field printing.
NI-MH rechargeable battery as the power source. Charge circuit integrated inside the instrument.
Auto power off to save energy.
Outline dimensions：212mm×80mm×32mm
Die cavity of molds
Bearings and other parts
Failure analysis of pressure vessel, steam generator and other equipment
Heavy work piece
The installed machinery and permanently assembled parts
Testing surface of a small hollow space
Material identification in the warehouse of metallic materials
Rapid testing in large range and multi-measuring areas for large-scale work piece
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1.1 Advantages
Leeb hardness of all metallic materials.
devices.
including single measured value, mean value, testing date, impact direction, impact times, material
and hardness scale etc.
limit.
Continuous working period of no less than 150 hours (EL off and no printing).
1.2 Main Application &Testing Range
1.2.1 Main Application
1.2.2 Testing Range
Testing range refer to Table 1 and Table 2 in the Appendix.
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1.3 Configuration
No.
Item
Quantity
Remarks
Standard
Configuration
1
Main Unit
1
2
D type impact device
1
With cable
3
Standard test block
1
4
Cleaning brush (I)
1
5
Small support ring
1
6
Battery Charger
1
9V 500mA
7
Paper for printing
1
8
Manual
1
9
Instrument case
1
Optional
Configuration
11
Cleaning brush (II)
1
For use with G type
impact device
12
Other type of impact
devices and support rings
Refer to Table 3 and
Table 4 in the
appendix.
13
Data-Pro software
1
14
Communication cable
1
15
16
Working temperature： -10℃～＋50℃;
Storage temperature：-30℃～＋60℃;
Relative humidity: ≤90％;
The surrounding environment should avoid of vibration, strong magnetic field, corrosive medium
The instrument can only work with the specially designed battery pack and power adapter (charger)
Do not cast the battery pack into fire and do not short circuit, disassemble or heat the battery pack,
Do not open the cover of the paper compartment or come into contact with the heating head of the
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Table 1-1
1.4 Working Conditions
and heavy dust.
1.5 Safety Instructions
supplied by Mitech Co. LTD. Working with others may result in damage of the instrument, battery
leakage, fire or even explosion.
otherwise battery leakage, fire or even explosion may occur.
printer by hand or any part of your body to avoid burns due to high temperature when the printer is
printing.
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2 Structure Feature &Testing Principle
1. Main unit
2. Impact device
1 Socket of impact device 2 Socket of USB 3 LOGO 4 Paper compartment cover 5 LCD display
6 Keypad 7 Battery switch 8 Power jack 9 Serial Number 10 Product label 11 Battery
compartment cover
DEL
SAVE
ESC
MENU
ENTER
MAT
DIR
FEED
PRT
1
M iT ec h
2
MODEL: MH320
BATTERY: 6V NI-MH
HARDNESS TESTER
CAUTION:
1 Do not disassemble
3 Use only supplied AC-DC adapter
for charging
CHARGER: 9V DC
2 Do not dispose of in fire or water
SCALE
DEL
SAVE
ESC
MENU
ENTER
MAT
DIR
FEED
PRT
11
10
9
8
7
6
5
4
3
2
1
OFF---ON
HL0108070811
M iT ec h
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2.1 Structure Feature
2.1.1 The Hardness Tester Appearance
2.1.2 Parts of the Main body
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2.1.3 D Type Impact Device
1 2 3 4 5 6 7
1 Release button 2 Loading tube 3 Guide tube 4 Coil unit
5 Connection cable 6 Impact body 7 Support ring
DC DL C D+15 E G
Error and repeatability of displayed value see Table 3-1.
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2.1.4 Different Types of Impact Device
2.2 Leeb Hardness Testing Principle
The basic principle is: use an impact body of certain weight impacts against the testing surface under
certain test force, then measure the impacting velocity and the rebounding velocity of the impact body
respectively when the spherically test tip is located 1mm above the testing surface.
The calculation formula is as follows:
Where, HL—— Leeb hardness value
3 Technical Specifications
HL=1000×VB/ VA
VB—— Rebounding velocity of the impact body
VA—— Impacting velocity of the impact body
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Table 3-1
No.
Type of impact
device
Hardness value of Leeb
standard hardness block
Error of displayed
value
Repeatability
1
D
760±30HLD
530±40HLD
±6 HLD
±10 HLD
6 HLD
10 HLD
2
DC
760±30HLDC
530±40HLDC
±6 HLDC
±10 HLDC
6 HLD
10 HLD
3
DL
878±30HLDL
736±40HLDL
±12 HLDL
12 HLDL
4
D+15
766±30HLD+15
544±40HLD+15
±12 HLD+15
12 HLD+15
5
G
590±40HLG
500±40HLG
±12 HLG
12 HLG
6
E
725±30HLE
508±40HLE
±12 HLE
12 HLE
7
C
822±30HLC
590±40HLC
±12 HLC
12 HLC
Measuring range：HLD（170～960）HLD
Measuring direction：360°
Hardness Scale：HL、HB、HRB、HRC、HRA、HV、HS
Display：dot matrix LCD，128×64 dots
Data memory： 500 groups max.（relative to impact times 32～1）
Printing paper: width is （57.5±0.5）mm, diameter is 30mm
Battery pack: 6V NI-MH
Battery charger: 9V/500mA
Continuous working period：about 150 hours（With backlight off, no printing）
Communication interface：USB1.1
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4 Preparation & Testing
In the preparation processing for sample surface, the hardness effect of being heated or cold
Too big roughness of the being measured surface could cause measure error. So, the surface of the
Support of test sample. Support is no necessary for heavy sample. Medium-weight parts must be
Curved surface: The best testing surface of sample is flat. When the curvature radius R of the
The sample should have enough thickness, minimum thickness of sample should conform to Table
For the sample with hardened layer on surface, the depth of hardened layer should conform to Table
Coupling. Light-weight sample must be firmly coupled with a heavy base plate. Both coupled
Magnetism of the sample itself should be avoided.
Insert the plug of the impact device into the socket of impact device on the tester.
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4.1 Preparation & Inspection before Testing
4.1.1Preparation of Sample Surface
Preparation for sample surface should conform to the relative requirement in the Appendix Table 3.
processing on the surface of sample should be avoided.
sample to be measured must appear metallic luster, smoothing and polish, without oil stain.
set on the smoothing and stable plane. The sample must set absolutely equability and without any
wobble.
surface to be tested is smaller than 30mm (D, DC, D+15,C, E and DL type of impact device) and
smaller than 50mm (G type of impact device), the small support ring or the shaped support rings
should be chosen.
3.
3.
surface must be flat and smooth, and there is no redundant coupling agent existing. The impact
direction must be vertical to the coupled surface. When the sample is a big plate, long rod or
bending piece, it can be deformed and become unstable, even though its weight and thickness is
big enough, and accordingly, the test value may not be accurate. So the sample should be
reinforced or supported at its back.
4.1.2 System Setting
See 6.9 for details.
4.1.3Presetting Testing condition
See 6.5 for details.
4.2 Testing Program
Verification of the tester is by using standard test block. The error and repeatability of displayed value
should be within the regulation of Appendix table 2.
Note ： Use a calibrated hardness tester, test the standard test block downward vertically for 5
times, the arithmetical average value compare with the value of standard test block. If this value
exceeds the standard value, could use the function of software calibration to adjusting.
4.2.1 Start-Up
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Press【 】key，now power is connected. The instrument is in testing condition.
4.2.2 Loading
Press the release button on the upside of the impact device to test. The sample and the impact
Each measure area of the sample usually need 5 times of testing operation. The result data
The distance between any two impact points or from the center of any impact point to the edge of
If want accurate conversion from the Leeb hardness value to other hardness value, contrastive test
Type of Impact
Device
Distance of center of the two
indentations
Distance of center of the
indentation to sample edge
Not less than (mm)
Not less than (mm)
D、DC
3
5
DL
3
5
D+15
3
5G4
8
E
3
5
C
2
4
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Pushing the loading-tube downwards until contact is felt. Then allow it to slowly return to the starting
position or using other method locking the impact body.
4.2.3 Localization
Press the impact device supporting ring on the surface of the sample firmly, the impact direction should
be vertical to the testing surface.
4.2.4 Testing
device as well as the operator are all required to be stable now. The action direction should pass the
axis of the impact device.
dispersion should not more than mean value±15HL.
testing sample should conform to the regulation of Table 4-1.
is needed to get conversion relations for the special material. Use inspection qualified Leeb
hardness tester and corresponding hardness tester to test at the same sample respectively. For
each hardness value, each measure homogeneously 5 points of Leeb hardness value in the
surrounding of more than three indentations which need conversion hardness, using Leeb hardness
arithmetic average value and corresponding hardness average value as correlative value
respectively, make individual hardness contrastive curve. Contrastive curve at least should include
three group of correlative data.
Table 4-1
4.2.5 Read measured value
After each impact operation, the LCD will display the current measured value, impact times plus one, the
buzzer would alert a long howl if the measured value is not within the valid range. When reaching the
presetting impact times, the buzzer will alert a long howl. After 2 seconds, the buzzer will alert a short
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howl, and display the mean measured value.
Replacing the impact device must be done during Power off. Otherwise the main body can not
You could not save the current test value if the test times are less than the presetting times value.
Only type D and type DC of impact device have the function of strength measure option. You can
Not all materials could convert to all hardness style value. The hardness style is reset to HL
Hardness scale
Average value indicator
Impact direction
Battery information
Times count
Measured value
Material
MH320
HARDNESS TESTER
Mitech Inc.
Probe Type:D
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NOTE:HL values tested by different impact devices are different,eg.780HLD≠780HLC
4.2.6 Power Off
Press【 】key to turn off the instrument.
5 Advice
identify the type of the impact device, and it can damage the circuit board of the main body.
not modify the 【Set hardness or бb】setting when using other types of impact device. The 【Set
hardness or бb】setting would be set to【Hardness】 automatically after replacing the impact device
whether the setting is 【Hardness】 or not before.
automatically after changing the material. So select material first before changing the hardness
style.
6 Operation in Details
6.1 Power On
Press【 】 to power on the system. The screen shows as below:
The system would automatically detect the type of the impact device during power up, and would display
this information on the screen. Users should pay attention to the probe type displayed on the screen.
After pausing for several second, the screen will exit and enter the main display interface.
Note: If the instrument is in power off condition, it will turns on automatically after the charge
power is connected.
6.2 Power Off
Press key【 】 could power off the system in any conditions.
Note: If the charge power is connected, the instrument will turns on automatically after pressing
the power off key.
6.3 Testing
Below is the main display interface:
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6.3.1 Instruction of the Main Display Interface
Battery information ：Display the information of the rest capacity of the battery, and the charging
Impact direction：The present impact direction.
Average value indicator ：It appears to show the mean value of the samples when reaching the
Hardness scale：Hardness method of the present measured value.
Measured value：Display present single time measured value（without mean value indicator）， or
Material：The present presetting material.
Impact times count： Times that have been impacted.
Press key【SAVE】to store present group of measured value into memory. This operation is only
Press key 【DEL】to delete the latest single measured value. After pressing this key, the screen will
Press key【 】 or key 【 】to move the
cursor to【YES】or【NO】.
Press key【ENTER】to confirm operation. Press
key【ESC】to cancel delete operation.
Press key【 】or【 】 could display single measured value.
Press key【 】could switch on of off the background light of LCD.
Press key【MENU】could enter the system presetting menu.
Quick keys:
Press key【DIR】to set the impact direction.
Press key【CNT】to change the impact times in one group. The impact times count item will be
Press key【SCALE】to change the hardness scale.
Press key 【 MAT 】 to change the material set. Presetting hardness scale recovers to HL
--------------
Confirm delete？
--------------
NO
YES
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status.
presetting impact times.
display the present mean value (with average value indicator prompting). means over conversion
or measure range. means lower than conversion or measure range.
6.3.2 Testing Operation at the Main Display Interface
Testing operation could be carried out under this interface. After each impact operation, it can display the
current measured value, impact times count plus one, the buzzer would alert a long howl if the measured
value is not within the tolerance limit. When reaching the presetting impact times, the buzzer will alert a
long howl. After 2 seconds, the buzzer will alert a short howl, and display the mean value.
6.3.3 Key Operation at the Main Display Interface
valid after displaying the mean value.
displays as below:
highlighted when first pressing the key【CNT】, and the impact times count value will plus one with
each pressing. The value will roll back to 1 when it reaches 32.
automatically after material presetting changed.
6.4 Menu Structure
Both presetting system parameters and the additional function could come true by menu operation. At
the main display interface, press key【MENU】 into the main menu.
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The Main Display Interface
Test Set
Print Set
Memory Manager
System Set
Software Info
Auto Save：
Auto Print：
Auto Delete：
Auto Trans.：
Key Sound：
Warn. Sound：
LCD Brightness
Time Date Set
Impact Direction
Average
Material
Hardness Scale
Tolerance Limit
Hard/бb：Hard
Print Current
Print Memory
Print All Memory
View From No.1
View From End
View From No.
Transfer
Delete by No.
Delete All
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6.5 Test Set
Press key 【ENTER】 to enter Test Set Menu.
The symbol ↓ at the left side of underside menu
indicates that the menu has not ended. Press
key 【 】 could continuously glance downward.
The symbol ↑ at the left side of the upside menu
indicates that the menu has not ended. Press
【 】could continuously glance upward.
Press key【 】or【 】to move the cursor to the
line you want to set, and press key【ENTER】to
confirm it.
Press key【 】 or 【 】to move the cursor
to the impact direction that you will preset.
Press key【ENTER】to confirm it.
Press key【ESC】to cancel it.
Print Set
Memory Manager
System Set
Test Set
Impact Direction
---------------
Mean Times
-------------
3
0
Impact Direction
Average
Material
Hardness Scale
Tolerance Limit
Hard/бb:Hard
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At the main display interface, press key【MENU】 to enter the main menu.
Note：1. When 【Hard/бb】is switched to бb,
the hardness scale could not be selected.
The cursor will skip over【Hardness Scale】
while moves the cursor.
2. Only D type of impact device has the
function of бb measure. So the cursor could
not move to 【 Hard/бb 】 while use other
impact device.
6.5.1 Impact Direction Setting
6.5.2 Average Times Setting
Press 【 】【 】 to move the cursor. Press
【 】【 】 to change the number. Press
key【ENTER】to confirm it. Press key【ESC】to
cancel it.
6.5.3 Material Setting
When 【Hard/бb】is preset to hardness, it will display the following material: Steel and Cast Steel、Cold
Work Tool Steel、Stainless Steel、Gray Cast Iron、Nodular Cast Iron、Cast Aluminum Alloys、Copper-Zinc
Alloys、Copper-Aluminum Alloys、Wrought Copper and Wrought Steel.
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Press key【 】or【 】to move the cursor to the
material you want to preset.
Press key【ENTER】to confirm it.
Press key【ESC】to cancel it.
Note 1. Presetting hardness scale recovers
Press key【 】or 【 】 to move the cursor to
the material to want to preset.
Press key【ENTER】to confirm it.
Press key【ESC】to cancel it.
2. If the bottom limit is larger than the upper
Copper-Alumin
Wrought Copper
Wrought Steel
Hard of Material
---------------
HV HB HRC
HS HRB HRA
HL
Tolerance Limit
---------------
Min Max
200 0890
0
Mild Steel
High-C Steel
Cr Steel
Copper-Zinc
Cr-V Steel
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to HL automatically after material presetting
is changed.
2. Please select material first, then select
hardness scale.
When 【Hard/ бb】is preset to бb, it will display the following material: Mild Steel、High-Carbon Steel、
Cr Steel、Cr-V Steel、Cr-Ni Steel、Cr-Mo Steel、Cr-Ni-Mo Steel、Cr-Mn-Si Steel、Super Strength Steel
and Stainless Steel.
6.5.4 Hardness Scale Setting
Press key【 】 or【 】to move the cursor to
the hardness scale you want to preset.
Press 【 ENTER 】 to confirm setting. Press
【ESC】 to cancel setting.
Note
：
1. Here only displays the valid
hardness scale for the present selected
impact device and material. It would not
display the hardness scale which is not valid.
2.Please select material first, then select
hardness scale.
3.Presetting hardness scale recovers to HL
automatically after presetting material is
changed.
6.5.5 Tolerance Limit Setting
6.5.6 Hardness/бb Setting
Press 【 】【 】 to move the cursor. Press
【 】【 】 to change the number. Press
【ENTER】 to confirm setting. Press 【ESC】 to
cancel setting.
Note:1. If the setting value exceeds the
measure range, the instrument will remind
you to reset.
limit, they will exchange automatically.
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Press key【ENTER】to switch between Hard and бb .
Printing function is unavailable while charging.
Printing can be stopped by pressing the 【ESC】key.
Do not open the cover of the paper compartment during printing. Otherwise the instrument
Over high ambient humidity (above 85% of relative humidity) or over low ambient humidity
Printing with paper that has been stored for over long period of time or of poor quality may
Press key【 】or key【 】to move the cursor
to【Memory Manager】.Press key【ENTER】into
【Memory Manager】menu.
Material
Hardness Scale
Tolerance Limit
Hard/бb:
Hard
System Set
Memory Manager
Test Set
Print Set
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Note: Only D and DC type of impact device
has the function of бb measure. So hard
is the only selection if the impact device is
not D or DC type.
6.6 Print Function
At the main display interface, press 【MENU】 to enter the main menu. Press 【 】【 】to move the
cursor to print menu and press 【ENTER】to enter the print menu.
Note:
may not print normally.
(below 20% of relative humidity) may reduce the print quality.
reduce the print quality or even damage the printer.
6.6.1 Print Current
Print out the data report just finished testing. If the instrument hasn’t been switched off, and hasn’t
changed any testing condition during continuous printing process, it will only print out single measured
value and average value when printing again.
6.6.2 Print Memory
Print out the selected group of measured value stored inside the instrument.
6.6.3 Print All Memory
Print out all the measured value stored inside the instrument.
6.6.4 Paper Feeding
When the printer is powered on and ready for printing, press 【FEED】 key then the instrument will start
manual paper feeding. Press and keep holding the 【FEED】 key to start paper feeding, while releasing
the key to stop paper feeding.
Note: Manual paper feeding is unavailable while charging.
6.7. Memory Manager
At the main display interface, press key【MENU】 enter the main menu.
If there is no data in the memory, displays: <No
Data!>. Then return.
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Press key【 】or key【 】to move the cursor
View From No.1
View From End
View From No.
Transfer
Delete By No.
Delete All
Select Group
From 001 to 010
--------------
01
0
Select Group
From 001 to 010
--------------
01
0
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to the function wanted, then press key【ENTER】
to confirm.
6.7.1 View from No.1 Group/View from Ending Group
【 View from No.1】Start display values in the memory from the first group.
【View from End】Start display values in the memory from the ending group.
6.7.2 View from Selected No. Group
Press 【 】【 】 to move the cursor. Press
【 】【 】 to change the number. Press
key【ENTER】 to start displaying memory data
from the selected beginning group. Press key
【ESC】to cancel current operation.
6.7.3 Data Transfer
【Transfer】export the values stored in the memory as text format to PC through USB port. This function
is not available now.
6.7.4 Delete by Group No.
【 Delete by No.】displays selecting the range of
deleting groups.
Press 【 】【 】 to move the cursor. Press
【 】【 】 to change the number. Press
key 【 ENTER 】 to delete the selected groups.
Press key【ESC】to cancel operation.
Note：
1. If the preset group number exceeds the actual range, then deletes the actual groups among
them.
2. Do not shut down the instrument while deleting data. It could lead to unpredicted consequence
if shutting down while deleting.
6.7.5 Delete All Data
【Delete All】will delete all the data in the memory.
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6.7.6 Deletion Confirmation
Press key【 】or【 】to move the cursor
to【YES】 and press key【ENTER】to confirm
deleting operation.
Press key【 】or【 】to move the cursor to
【 NO 】 and press key 【 ENTER 】 to cancel
deleting operation.
Press key【ESC】could cancel deleting operation,
no matter where the cursor is.
Press key【 】or【 】to see previous or next
page.
Press key【ESC】to exit browsing.
Press key【ENTER】, then press 【 】or【 】
to move the cursor to the line which you want to
see details. Press 【 ENTER】to see details of
that group.
Press key 【 】 or 【 】 to browse details
including average value, test set and each single
value.
Press【ESC】to return to previous display.
---------------
Confirm delete？
---------------
NO
No.001 12/03 652HL
No.002 12/03 587HL
No.003 12/03 820HL
No.004 12/03 693HL
No.005 12/03 783HL
No.006 12/03 782HL
No.007 12/03 579HL
No.008 12/03 687HL
YES
No.002 12/03 785HL
No.003 12/03 516HL
No.004 12/03 789HL
No.005 12/03 570HL
No.006 12/03 852HL
No.007 12/03 523HL
No.008 12/03 796HL
No.001 12/03 514HL
No.001 12/03/02
Average= 514HL
D 05 times
Steel
511 513 516 ↑
514 515
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6.8 Browsing Memory Data Groups
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6.9 System Set
Press key【 】to enhance the brightness. Press
key【 】to weaken the brightness.
Press key 【 ENTER 】to confirm the modifying.
Press key【ESC】to cancel the modifying.
System Set
Test Set
Print Set
Memory Manager
Auto Save:Off
Auto Print:Off
Auto Delete:Off
Auto Trans.:Off
Key Sound:On
Warn. Sound:On
LCD Brightness
Time Date Set
LCD brightness
---------------
Bright:Press[ ]
Dark:Press[ ]
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At the main display interface, press key【MENU】 enter the main menu.
Press key【 】or key【 】to move the cursor
to【System Set】Menu.
Press key【ENTER 】 to enter【System Set 】
menu.
Press key【 】or key【 】to move the cursor
to the item wanted.
Press key【ENTER】to modify the setting directly
or into corresponding screen.
Press key【ESC】to exit.
【Auto Save】 【Auto Delete】 【Auto Trans】
【 Key Sound 】 【 Warn. Sound 】 could be
switched on or off.
When【Auto Save】is set to <On>, could store the data of current group automatically after measuring
and displaying average value.
When【Auto Print】is set to <On>, could print the data of current group automatically after measuring and
displaying average value.
When【Auto Delete】is set to <On>, according to 3σ rule, could cancel gross error automatically after
having measured presetting average times or pressing end in advance. If there is data canceled, it
needs supplemental measure to reach presetting times.
When【Auto Trans.】is set to <On>，could export the value of present group through communication port
after measuring and displaying average value. It’s not available now.
When【Key Sound】is set to <On>, the buzzer would make a short hoot while press key each time.
When【Warn. Sound 】is set to <On>, if the measured value exceeds the tolerance limit, reached the
presetting average times or deleting data, the buzzer would make a long hoot.
6.9.1 LCD Brightness Set
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6.9.2 Time Date Set
Set the impact direction as 【 】 . Measure 5
points on the standard hardness block.
Time Date Set
--------------
0/05/2008 11:02
Software Info
Print Set
Memory Manager
System Set
Mitech MH320
Version:1.00
Code:HL20000000
SN:HL2000000000
Calibration
--------------
0/5 times
1
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Present time and date is displayed as“M/D/Y
H/M”. Press the figure 【 】【 】 keys to
modify the present figure. Move the cursor by
pressing the 【 】【 】keys. Press key
【 ENTER 】 to confirm modifying. Press key
【ESC】to cancel modifying and exit.
6.10 Software Information
At the main display interface, press key【MENU】 enter the main menu.
Press key【 】or key【 】to move the cursor
to【Software Info】.
Press key【ENTER】into 【Software Info】screen.
This screen displays the information about the
main body and the firmware. The version, the
Code and the SN would change with the
firmware.
6.11 System Calibration
The tester and impact device must be calibrated using hardness block before use as the first time, or
having not been used for a long time, or having reset the system.
Press key【 】, meanwhile pressing【ENTER】to power on the system. Then the software calibration
screen shows as below.
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It would display the average value after
measuring 5 times.
Press key【 】 or key【 】to input the nominal
value.
Press key【ENTER】to confirm.
Press key【ESC】to cancel this operation.
Range of adjustment: ±15HL.
6.12 EL Background Light
With the background light, it is convenient to work in the dark condition. Press key【 】to switch on or
switch off the background light at any moment as you like after power on.
The instrument has the function of powering off automatically to save power.
The system would power down automatically if there’s neither measuring nor any key operation
While the voltage of the battery is too low, the screen will show < Battery Empty!>, then power off
When the instrument is being charged, the Auto Power Off will not function.
Hold Both ends of the paper
compartment with fingers and open the
compartment cover with moderate
strength.
According to the illustration, put the
paper into the paper compartment with
attention to the paper direction. If the
paper is misplaced, the instrument will
fail to print.
Pull a trip of paper out of the
compartment.
Make sure that the paper is well in
place and close the paper
compartment cover.
The battery switch should be at ‘ON’ condition before charging.
Plug the power adapter into the mains supply power socket and then plug the charger connector
When the battery is fully charged, the battery symbol on the display will glint .
Please use the configured AC-DC adapter to charge the battery pack.
Calibration
--------------
Average=780
Nominal=
780
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6.13 Auto Power Off
within 5 minutes. Except key【 】, press any key could stop the twinkle of LCD screen and stop the
operation of power off at the moment.
automatically.
6.14 Paper Loading
6.15 Battery Charge
The instrument uses a NI-MH battery pack as its power source. When the battery pack almost runs
out, the battery symbol on the display will glint . It needs charging as soon as possible. Try to
drain your battery pack as fully as possible before it is charged for longest battery service.
into the power jack of the instrument. If the instrument is in power off condition, it will turns on
automatically after the charger plug is inserted into the power jack. The battery symbol will
alternately shows between and when charging. The more of the dark part indicates
the more close to full capacity.
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Warning: When the battery pack is being charged, printing or paper feeding is unavailable.
Power down the instrument.
Take off the battery compartment cover and take out the battery pack.
Insert the connection plug of the new battery pack into the socket on the circuit board.
Reset the battery cover.
Turn on the instrument to check.
Fault Appearance
Fault Analysis
Handling method
Charge failure
Battery failure
Replace the battery with a
new pack
The battery is switched off
Switch on the battery
No measured value
Impact device cable failure
Replace the cable
Failure power on
Battery exhaustion
Charge the battery
The battery is switched off
Switch on the battery
Release the impact body after use.
Any lubricant is absolutely prohibited inside the impact device.
Keep it away from vibration, strong magnetic field, corrosive medium, dumpiness and dust. Storage
With original packing, transport is allowed on the third grade highway.
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6.16 Battery Replacement
When the battery pack fails to be charged, the user should replace the batteries following the program
below:
Warning: Please pay much attention to the polarity of the battery during battery replacement.
6.17 Connection of Data Transmission Cable
Insert one connection plug of the transmission cable into the USB socket on the right side of main body,
and insert the another plug into the USB port on the back of computer box. Refer to the manual of the
DataPro software for detailed information.
7 Fault Analysis & Evacuation
8 Servicing & Maintenance
8.1 Impact Device Servicing
After the impact device has been used for 1000--2000 times, please use the nylon brush provided to
clean the guide tube and impact body. When cleaning the guide tube, unscrew the support ring first, then
take out the impact body, spiral the nylon brush in counter-clock direction into the bottom of guide tube
and take it out for 5 times, and then install the impact body and support ring again.
8.2 Normal Maintenance Program
When using standard Rockwell hardness block to testing, if all the error is bigger than 2 HRC, it may be
the invalidation of impacted ball top caused by abrasion. Changing the spherical test tip or impact object
should be considered.
When the hardness tester appears some other abnormal phenomena, please do not dismantle or adjust
any fixedly assembled parts. Fill in and present the warranty card to us. The warranty service can be
carried on.
9 Calibration
Calibration is needed every 1 year.
10 Notice of Transport and Storage Conditions
in ordinary temperature.
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APPENDIX
Material
Method
Impact device
D/DC
D+15CGEDL
Steel and cast
steel
HRC
20～68.5
19.3～
67.9
20.0～
69.5
22.4～70.7
20.6～
68.2
HRB
38.4～
99.6
47.7～
99.9
37.0～
99.9
HRA
59.1～
85.8
61.7～88.0
HB
127～
651
80～638
80～683
90～646
83～663
81～646
HV
83～976
80～937
80～996
84～1042
80～950
HS
32.2～
99.5
33.3～
99.3
31.8～
102.1
35.8～
102.6
30.6～
96.8
Cold work
tool steel
HRC
20.4～
67.1
19.8～
68.2
20.7～
68.2
22.6～70.2
HV
80～898
80～935
100～
941
82～1009
Stainless steel
HRB
46.5～
101.7
HB
85～655
HV
85～802
Grey cast iron
HRC
HB
93～334
92～326
HV
Nodular cast iron
HRC
HB
131～
387
127～364
HV
Cast aluminum
alloys
HB
19～164
23～210
32～168
HRB
23.8～
84.6
22.7～
85.0
23.8～
85.5
BRASS(copper-
zinc alloys)
HB
40～173
HRB
13.5～
95.3
BRONZE(coppe
r-aluminum/tin
alloys)
HB
60～290
Wrought copper
alloys
HB
45～315
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Table 1
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Table 2
No.
Material
HLD
Strength σb(MPa)
1
Mild steel
350～522
374～780
2
High-Carbon steel
500～710
737～1670
3
Cr steel
500～730
707～1829
4
Cr-V steel
500～750
704～1980
5
Cr-Ni steel
500～750
763～2007
6
Cr-Mo steel
500～738
721～1875
7
Cr-Ni-Mo steel
540～738
844～1933
8
Cr-Mn-Si steel
500～750
755～1993
9
Super strength steel
630～800
1180～2652
10
Stainless steel
500～710
703～1676
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Table 3
Type of impact device
DC(D)/DL
D+15CG
E
Impacting energy
Mass of impact body
11mJ
5.5g/7.2g
11mJ
7.8g
2.7mJ
3.0g
90mJ
20.0g
11mJ
5.5g
Test tip hardness:
Dia. Test tip:
Material of test tip:
1600HV
3mm
Tungsten
carbide
1600HV
3mm
Tungsten
carbide
1600HV
3mm
Tungsten
carbide
1600HV
5mm
Tungsten
carbide
5000HV
3mm
synthetic
diamond
Impact device diameter:
Impact device length:
Impact device weight:
20mm
86(147)/
75mm 50g
20mm
162mm
80g
20mm
141mm
75g
30mm
254mm
250g
20mm
155mm
80g
Max. hardness of sample
940HV
940HV
1000HV
650HB
1200HV
Mean roughness value of
sample surface Ra:
1.6μm
1.6μm
0.4μm
6.3μm
1.6μm
Min. weight of sample:
Measure directly
Need support firmly
Need coupling tightly
>5kg
2～5kg
0.05～2kg
>5kg
2～5kg
0.05～2kg
>1.5kg
0.5～1.5kg
0.02～0.5kg
>15kg
5～15kg
0.5～5kg
>5kg
2～5kg
0.05～2kg
Min. thickness of sample
Coupling tightly
Min. layer thickness for
surface hardening
5mm
≥0.8mm
5mm
≥0.8mm
1mm
≥0.2mm
10mm
≥1.2mm
5mm
≥0.8mm
Size of tip indentation
Hardness
300HV
Indentation
diameter
Depth of
indentation
0.54mm
24μm
0.54mm
24μm
0.38mm
12μm
1.03mm
53μm
0.54mm
24μm
Hardness
600HV
Indentation
diameter
Depth of
indentation
0.54mm
17μm
0.54mm
17μm
0.32mm
8μm
0.90mm
41μm
0.54mm
17μm
Hardness
800HV
Indentation
diameter
Depth of
indentation
0.35mm
10μm
0.35mm
10μm
0.35mm
7μm
----0.35mm
10μm
Available type of impact
device
DC: Test hole
or hollow
cylindrical;
DL:Testslender
narrow groove
or hole
D+15: Test
groove
or
reentran
t surface
C: Test
small,light,thi
n parts and
surface of
hardened
layer
G: Test
large,
thick,heavy
and rough
surface steel
E: Test super
high
hardness
material
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Table 4
No.
Type
Sketch of
non-conventional
Supporting ring
Remarks
1
Z10-15
For testing cylindrical outside
surface R10～R15
2
Z14.5-30
For testing cylindrical outside
surface R14.5～R30
3
Z25-50
For testing cylindrical outside
surface R25～R50
4
HZ11-13
For testing cylindrical inside
surface R11～R13
5
HZ12.5-17
For testing cylindrical inside
surface R12.5～R17
6
HZ16.5-30
For testing cylindrical inside
surface R16.5～R30
7
K10-15
For testing spherical outside
surface SR10～SR15
8
K14.5-30
For testing spherical outside
surface SR14.5～SR30
9
HK11-13
For testing spherical inside surface
SR11～SR13
10
HK12.5-17
For testing spherical inside surface
SR12.5～SR17
11
HK16.5-30
For testing spherical inside surface
SR16.5～SR30
12
UN
For testing cylindrical outside
surface,radius adjustable R10～∞
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User Notes
Damage caused by man-made or improper keeping;
Self-dismantle or non-special repair shop dismantle;
Do not follow the requirement of service registration or warranty expired;
Consumable parts.
MITECH users have lifelong maintenance service
Free maintenance, inspection, software upgrade and etc.
Add: Room E506B, YingChuangDongLi Park, 1# of ShangDi East Road,
Haidian District, Beijing, China
Post code：100085
Website: www.mitech-ndt.com
Email: mvip@mitech-ndt.com
Tel: 0086-10-58858658
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Warranty：
The product is guaranteed for one year since purchased. Log www.mitech-ndt.com or follow our
company official public platform to register for maintenance. Please fill the blanks as required, if the
product is not registered for maintenance, it will follow the date of manufacturer.
When applying for maintenance, please visit our official website, www.mitech-ndt.com or official
accounts, submit “online reporting to repair” sheet.
In accordance with the international relevant regulations, the following are not within the scope of free
warranty,
Service promise：
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