Time
Impact Rebound
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POLYGON Instrument Ltd.
1 Introduction
1.1 Principle
1.2 Structure
1.3 Specifications
2 Test
2.1 Instrument Preparation
2.2 Specimen
2.3 Test Procedure
2.4 Browse
2.5 Printing
3 Setup
3.1 Material
3.2 Direction
3.3 Scale
3.4 Clock
Preparation
EPX300
Portable Hardness Tester
C
O
N
T
E
N
T
S
4 Maintenance
4.1 Routine Maintenance
4.2 Calibration
4.3 System Reset
Appendix
A-1 Hardness Conversion
A-2 Tensile StrenghConversion
1 Introduction
1.1 Principle
The tester measuring principle is physically a
rather simple, dynamic hardness tester.
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 will result in loss of kinetic energy.
The energy loss is calculated by velocity
measurements when the impact body is at a
precise distance from the surface for both the
impact and 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, and signal
processing by the electronics provides the
hardness reading for display and storage.
1.2 Structure
1) Display Unit 2) Impact Device
. 1 .
Portable Hardness Tester
Standardized
according to
ASTM A956
SCALE
MAT
DEL
DIR
EPX300
D
1
4
7
8
6
Φ
20
DC
Release Button
Loading Tube
Coil
Catch Chuck
Cable
Impact Body
Support Ring
LCD
Signal Cable
Cell Cover
Material Code
SCALE
MAT
DEL
DIR
Mat'L
Avg.
HRC
Avg.
HL
Clock
Material Code
Impact Direction
Impact Times
Conversion Average
Conversion Scale
Conversion
HL Average
HL Value
SCALE
DIR
DEL
MAT
❶
In measurement mode, press and hold it to erase
the measured data. Or if the mini-printer is linked
with the display unit, it will print out those data.
❷In other mode, press it to complete setup and
save the parameters and return to the
measurement mode.
Browse data in memory
Adjust date and time.
Pressing and holding to
turn on/off power.
Turn on/off the LCD
backlight
❶
In measurement mode, press it to
setup the impact direction.
❷In Date/Time setup mode and
calibration mode, press it to increase
the flickering bit.
❸In browse mode, press it to display
the previous data.
❶
In measurement mode, press it to
setup the conversion scale.
❷In Date/Time setup mode and
calibration mode, press it to decrease
the flickering bit.
❸In browse mode, press it to display
the next data. measurement mode or
browse mode.
Press and hold it to delete current data
in measurement mode or browse mode.
❶
In measurement mode, press it to
select the material.
❷In Date/Time setup mode and
calibration mode, press it to select
the next bit.
3) Display
4) Keypad
1.3 Specifications
●
Display Range
0
～
999HLD
●
Accuracy
:
±6 HL(at 800HLD)
●
Resolution
:
1 (HL,HV,HB, HSD , MPa ); 0.1(HRC,HRB)
●
Impact Energy
:
11 Nmm
●
Mass of Impact Body
:
5.5g
●
Test Tip
:
Φ
3mm
tungsten carbide ball
●
Power
:
3 *1.5V AAA Batteries
●
Operating Temperature
:
0°C~+50°C (32°F~122°F)
●
Storage Temperature
:
-10°C~+60°C (14°F~140°F)
●
Dimensions
:
150*80*24mm(Display unit), Impact length
●
Weight
:
Approx.200g(display unit)
Impact device 75g(Type D), 50g (Type DC)
●
Conforms to Standard
:
ASTM A956 & DIN50156
:
. 2 .
