PROFESSIONAL
Instruction Manual
Digital Hardness Tester for Metals (Rebound Type)
Model No.
LHT-400
LEEB HARDNESS TESTER
Thank you for purchasing the Niigata Seiki Leeb-Type Hardness Tester.
This digital instrument measures the hardness of (non-magnetized) metals: steel, cast steel, tool steel, stainless steel, heat
resistant steel, standard (gray) cast iron, ductile (nodular cast) iron, cast aluminum alloys, brass, bronze, and copper. Hardness is
measured by impacting the surface of the sample with a test probe and measuring the rebound velocity.
●For safe and proper use of this product, please read this
instruction manual before use and follow the procedures
described. Please keep manual where it is accessible to user
for future reference.
●Keep this manual with the instrument if transferred or leased to
a third party.
●For inquiries about this product, please contact dealer or
Niigata Seiki at the address listed on the following page.
■ PART IDENTIFICATION & FUNCTION
[Main Unit]
③ LCD Display
② Measuring
Ring
① Probe
⑤ Cover
⑥ Measure Button
④ ＵＳＢ Port
⑦ Handle
⑩ Up Button
⑨ Down Button
⑧ Power Button
In this manual, indicates RISK OF PERSONAL INJURY
OR PROPERTY DAMAGE if not followed. The symbol
indicates something which is PROHIBITED, and the
symbol indicates REQUIRED step or necessary condition.
SAFETY NOTIFICATIONS
Probe ·························· Impactor which strikes surface
①
during measurement.
Measuring Ring ·········· Pressed to surface during
②
measurement.
LCD Display ··············· For display of measurements
③
and settings.
USB Port ···················· Connects to included USB cable
④
for charging and data output.
Cover ·························· Cover for USB Port. Please
⑤
keep closed when not in use.
⑥
Measure Button ··········· Press to release Probe and
trigger a measurement.
Handle ························· Move down to position Probe
⑦
for measurement.
Power Button ·············· Power ON/OFF, and menu
⑧
select button.
Up Button ···················· Button to select a setting, and
⑨
to control display size.
⑩
Down Button ················ Button to select a setting, and
to delete last measurement.
[Accessories]
⑪ＵＳＢ Cable
⑫ Cleaning
Brush
⑬
Measuring Ring (sml.)
● Case ● Manual
[Measurement Screen]
Ⓑ Ⓚ Ⓒ
Ⓛ
H
HL
AUTO
Ⓐ
Ⓜ
■Standard
Display
D
ST&CAST ST
Ⓙ ⒾⒽ
HLD:
MAX:
MIN:
AVG:
419
411
414
00003 3:
075
USB Cable ·················· Connects for charging Main
⑪
Unit and transferring data.
Cleaning Brush ··········· For cleaning inside of Main
⑫
Measuring Ring (sml
⑬
⑭ＡＣ Adapter
⑮ Calibration
Block
Ⓓ
Ⓔ
Ⓕ
Ⓖ
%
Ⓐ
■Large Readout
Ⓑ ⓀⒸ
AUTO
419
Display
HLD:HHL
AC Adapter ················· Charges Main Unit via the
⑭
⑮
Calibration Block ········ Test Block of specified hardness
●
Storage Case ·············· Storage case for Main Unit
Instruction Manual ······ This user guide.
●
Scaled t / Average
Ⓐ
Scale Units
Ⓑ
Measurement
Ⓒ
Maximum
Ⓓ
Minimum
Ⓔ
Average
Ⓕ
Record Number
Ⓖ
Press the Up Button to toggle
between Standard and Large readout
Unit.
.) ··· Replaceable tip for use in
tight places.
USB Cable.
checking, and calibrating
for
unit before each test.
and accessories.
Battery Charge Level
Ⓗ
No Measurements / Total
Ⓘ
Material Setting
Ⓙ
High・Low Limit Exceeded
Ⓚ
Ｈ） （Ｌ）
（
Memory Auto / Off
Ⓛ
ⓂProbe Type
SAFETY PRECAUTIONS
Please Observe
Always follow the procedures specified below in order to prevent harm to yourself or others, and to prevent damage to property.
■ Content marked as follows indicates risk of injury or
damage if not followed.
WARNING
Indicates risk of personal injury or
property damage if not followed.
■ These symbols mark content that must be observed.
Denotes a prohibition
– You MUST NOT do
Denotes a requirement –
You MUST do
CAUTION
Read the manual and follow all instructions.
・Use of product other than as described in the manual may
cause accident.
Use only for measuring hardness.
・Use for any purpose other than measuring may damage or
wear the instrument. Improper use may also cause accident.
Use in an environment which meets the following
conditions:
● Keep away from direct sunlight
● Keep in dry location protected from rain and water.
● Protected from use by children and unauthorized people.
・Use in location contrary to the above may cause poor accuracy,
damage to the product, or may result in accident or injury.
Handle With Care.
・Do not drop or subject to shock, do not place under heavy
objects. Damage may cause failure or poor accuracy.
Preparation of Test Surface
The workpiece and measured surface must meet the following
conditions.
① Mass: 5 kg or more
※For workpiece weighing between 2 and 5 kg, or for thin and easily
deformed parts, place on a surface plate or stable surface of more
than 5kg.
※For workpiece weighing less than 2kg, secure it to a surface plate
of more than 5kg using a coupling agent, such as petroleum jelly,
with a tight fit to stabilize.
② Surface Roughness: Ra 2μm or less
※If surface is rougher than Ra 2μm, please polish to meet
specification.
③ Radius of Curvature: greater than 30mm
④ Surface Temperature: 80°C or less
⑤ For testing surface hardness, a hardened surface thickness:
0.8mm or greater
⑥ Not Magnetized
※Be sure to demagnetize if there is any residual magnetism.
⑦ Bare (unpainted) Surface
※ If sample is painted, remove any paint or coating before test.
⑧ Not easily fractured, or damaged by the surface indents
resulting from the test
※This instrument measures hardness by impacting a probe, with a
hardness of HLD 1600, against the test surface. Please note: after
testing, some small dents will remain on workpiece.
Charging
The Main Unit contains a rechargeable battery. When
power level drops below 20%, please charge as follows.
① Connect with the provided USB Cable
Connect to the AC Adapter using the included USB cable.
Plug in the AC adapter
②
Plug the AC adapter into the power mains (100V AC).
Not for use on on materials which are easily fractured, or
which will be damaged by the dents created during tests.
・This instrument measures hardness by impacting a probe, with
a hardness of HLD 1600, against the test surface. Please note:
after testing, some small dents will remain on workpiece.
Do not use on magnetized material or in presence of
magnetic fields.
・Hardness is measured based on rebound speed of the Impact
Probe. If magnetic field is present, the rebound speed may be
affected and a precise measurement is not possible.
Do not dryfire instrument.
・If test is performed without test surface under probe, the
instrument may be damaged and affect accuracy.
Do not Modify or disassemble beyond the
procedures described in this manual.
・It may damage product or affect accuracy. For service,
please contact distributor or place of purchase.
Accuracy Confirmation ・ Calibration
Instrument accuracy will be affected by shock or Probe wear.
Please check accuracy and calibrate before each use using
the supplied Calibration Block.
① Confirm the hardness written on Calibration Block
The hardness of the calibration master is marked on the block
surface.
779HLD
⑮ Calibration Block
② Measure the Calibration Block hardness
Use the "Hardness Test Procedure" on the following page to test
the hardness.
● Material = Steel ● Unit = HL ● No. of Measurements = 5
※
Make sure the Calibration Block surface is clean before measurements.
※Take the measurements in a spot free of marks from previous
measurements.
③ Error Correction
※If the measured hardness from step ② is within ±17HL of the
hardness from step ①, then the accuracy is confirmed within the
guaranteed range and the instrument is ready to use.
※If the measured hardness from step ② is NOT within ±17HL of the
hardness from step ①, then the calibration must be adjusted. Enter
the measurement error In the "Setup Menu" → "6. Calibration" as
shown in the following page.
Connect
④ USB Port
Main Unit
⑪ USB
Cable
Block hardness
⑭ AC Adapter
USB Port
Connect
Power ON／OFF
Power ON ··········· Press the Power Button. The power will turn on and the Measurement Screen will display on the LCD.
●
● Power OFF ········ From the Measurement Screen, press and hold the Power Button for 3 seconds. Power and LCD will turn off.
Hardness Test Procedure
Follow the steps below for a basic hardness test.
① Turn the power ON.
Press the Power Button to turn on the power.
② Set the material and measurement units.
Specify the workpiece material and desired scale units in the "Setup Menu"
→ "3. Material & Scale" After entering the settings, select "1.
Measurement" to return to the Measurement Screen.
③ Press the Measuring Ring against the surface.
Make sure the workpiece and test spot meet the conditions listed in the section
"Preparation of Test Surface", and press the Measuring Ring onto the surface.
※
Make sure there are no scratches or marks from previous measurements.
④ Push down on the Handle, and then pull it back up. (Figure 1)
Push down on the Handle to charge the internal probe for the test,
then lift the Handle to bring it into position for the test.
※Make sure you hold the Handle secure while bringing it up to the
top. If the Handle slips, it may return with a shock and cause
damage.
⑤ Press the Measure Button. (Figure 2)
With the Measuring Ring held firm to the surface, press the Measure
Button. The Probe will release and impact the surface. Hardness will
be calculated from the rebound velocity.
※Be careful not to push down on the Handle when pressing the
Measure Button, it will cause inaccurate readings.
⑥ Repeat the measurement in steps ④~⑤ .
Repeat the required number of times specified in the "Setup
Menu"→ "2. Average" for calculating an averaged reading.
⑦ The measurements are displayed. (Figure 3)
The average value, maximum reading, and minimum reading are
displayed on the LCD display.
※Because workpiece hardness my not be uniform, measurements should be
taken from multiple locations on the surface of the workpiece for averaging.
３
Press
１
Push down
Average
Value
【
Automatic Angle Co
The instrument automatically
senses the measurement angle
and applies a correction factor
the reading. Measurement can
be made freely over 360° range.
Please make sure the
Measuring Ring is always
pressed firm against the surface
when taking a measurement.
２
Return to top
⑦ Handle
Workpiece
（Fig.１）
AUTO
D
mpensation
⑥ Measure
Button
HL
ST&CAST ST
】
Workpiece
to
②
HLD:
MAX:
MIN:
AVG:
easuring
M
Ring
00003 3:
075
419
411
414
（Fig.２）
Maximum
Minimum
Average
%
（Fig.３）
Measure
Setup Menu
When power is ON, pressing the Power Button will display the Setup Menu screen. Within the Setup Menu, the Up and Down
buttons are used to select items and to change values, and the power button is used to enter the selection.
1. Measurement ·····
2. Average ·······
3. Material & Scale ···
4. Tolerance
········
5. Memory ·········
6. Calibration ·······
7. Auto Shutdown ····
8. Contrast ·········
9. Impact Type ······
10. Language ·······
11. Default ·········
Return to the Measurement Screen.
Change the number of measurements averaged for each reading. You can select 2-8 measurements.
Specify the workpiece material, and set the measurement units.
When specifying the material and units, options are shown, so select as required.
To set up tolerance function. Press Up Button to change the value, and Down Button to move to next digit.
"H" or "L" will appear on the display for readings above or below the set limits.
Control the storage of measured data.
1. Memory on/off ······ ON - Measurements saved sequentially up to number specified below.
OFF - Measurement data is not saved
2. File Setting ··········· Specify the storage destination for the group of measurements.
Ten groups, A to J, can be stored with 200 Measurement averages each.
3. Delete Single ······· Delete data from the specified group.
4. Delete All ············· Clear the Main Unit stored measurement data.
Correct the measurement by entering the error value determined in the accuracy check from the "Calibration" section
on the previous page.
Automatic power shut off can be selected for 1, 2, 5 minutes; or disabled.
Adjust the contrast of the display.
Set parameters to match the type of probe
Select from Japanese / English.
Restore all settings to factory default.
Back Page: Installing DL-Type Probe (sold separately)
Back Page: Meas. Range Listing for Each Material, Units
Measurement Data Output
Niigata seiki Co., Ltd.
5-3-14, Tsukanome, Sanjo, Niigata, Japan, 955-0055
Tel. : +81-256-33-5522 Fax. : +81-256-33-5518
MAIL intl.sales@niigataseiki.co.jp
URL http://www.niigataseiki.co.jp
① Connect the Main Unit to the computer
Please connect the USB Port of the Main Unit to the computer's USB Port using the
USB Cable and turn on the power. The Display will show "Connected between
instrument and PC"and the computer will show a CD drive icon.
② Open the CD drive icon on the computer.
The data is stored as text (.txt) files labeled A∼J, and you can open the desired file to
view.
The file contents are listed below
Num
Impact
Material
Scale
AVGDATA
DATA1～8
※ Files can not be deleted or created through the computer, you must delete at the Main Unit.
File Number
Probe type: D/DL
The material type set in the "Material & Scale" setting
The scale set in the "Material & Scale" setting
Average of Measurements
Measurement data. The number will correspond to the " Average" setting
Changing The Measuring Ring, Cleaning
The Measuring Ring can be exchanged with a small one if required to fit in tight locations.
Also, the ring can be removed to for periodic cleaning inside of the mechanism.
① Press the Measure Button.
Release the probe from charged position.
②
Turn the Measuring Ring to remove it from the Main Unit (Figure 4) and take out the Probe.
③ Cleaning.
Using the supplied brush, clean the inside of the main unit as well as the Probe to
remove any dust or dirt.
④ Replace the Probe and reattach the Measuring Ring to the Main Unit.
Insert the Probe in the direction shown in the drawing. (Figure 5)Screw the Measuring
Ring back on to the main body.
Computer USB Port
Connect
⑪ USB Cable
Connect
④ USB Port
Main
Unit
Connected between
instrument and PC
※ Before cleaning, or replacing the Measuring Ring,
make sure the power is turned OFF.
Loosen
② Measuring
Ring
Threads
（Fig.４）
Tighten
② Measuring Ring
Installing DL-Type Probe (sold separately)
Measurement can be made in narrow spaces, such as the bottom groove of a large
gear, by replacing the Probe with the DL-type Probe available for the Hardness Tester.
Press the Measure Button.
①
Release the Probe from charged position.
② Turn the Measuring Ring to remove it from the Main Unit (Figure 4)
and take out the (Dtype) Probe.
③ Insert the DLtype Probe as shown in the drawing and attach the
measurement guide. (Figure 6)
④ Change "Setup Menu → "9. Impact Type" from "D" to "DL".
（Fig.５）
① Probe
Measurement guide
DL-Type Probe
（Fig.６）
Insert
Insert
Measurement Range Listing by Material, Units / Specifications
Material
ST& CAST ST.
1.
CWT STEEL
2.
STAINLESS ST.
3.
G CAST IRON
4.
N CAST IRON
5.
CAST ALUM
6.
BRASS
7.
BRONZES
8.
COPPER
9.
● Accuracy: within ±17HL
● Operating Temperature: 0∼+40°C
Unit Scale
HL HRC HRB HB HS HV
300 〜 900
300 〜 640
300 〜 800
360 〜 650
400 〜 660
174 〜 560
200 〜 550
300 〜 700
200 〜 690
20.0 〜 68.0
20.4 〜 67.1
19.6 〜 62.4
−
−
−
−
−
−
● Weight: Main unit … 97g
● Data Storage Capacity: Max. 2,000 avg. readings
38.4 〜 99.5
−
46.5 〜 100.7
−
−
−
13.5 〜 95.3
−
−
80 〜 647
−
85 〜 656
90 〜 334
131 〜 367
20 〜 190
40 〜 173
60 〜 290
45 〜 315
32.5 〜 99.5
−
−
−
−
−
−
−
−
● Auto Power Off: 1, 2, 5 minutes, or disabled
● Charge time: approx. 3 hours
80 〜 940
80 〜 898
85 〜 802
−
−
−
−
−
−
σb
373 〜 2008
−
−
−
−
−
−
−
−
Maintenance and Storage
Remove any dust or grime with a dry cloth.
Any contamination entering inside the Main Unit will prevent smooth operation of the Probe.
Store in a cool, dry, and dark location in the provided case.
Keep out of direct sunlight
and moisture, and please keep secure from unauthorized personnel.
Niigata Seiki Co., Ltd.
61522, Tsukanome, Sanjo, Niigata, Japan 9550055
TEL: +81256315670 FA
MA I L : i n t l . s a l e s@n i i ga t a s e i k i . c o . j p
URL http://www.niigataseiki.co.jp
I336-K
X: +81256397730
1812
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