12
2.2 Testing principle
Let a impact body whose weight is definite rush into the surface of sample,
the hardness value comes from the rate of rebound velocity and rush velocity
at 1mm distance from testing surface. The calculation formula is following:
HL=1000×VB/ VA
In which: HL——Leeb hardness value
VB——Rebounding velocity of the impact body
VA——Impacting velocity of the impact body
Output signal diagram of the impact device
is as following.
3 Technical capabilities
3.1 Specifications
⚫
Measuring range: HLD (170-960)
，
HRC (17.9-69.5)
，
HB (19-683)
，
HV
(80-1042)
，
HS (30.6-102.6)
，
HRA(59.1-88)
，
HRB (13.5-101.7)
⚫
Measuring direction: 360
°
⚫
Hardness scale: HL, HB, HRB, HRC, HRA, HV, HS
⚫
Display: TFT, 320
×
240 matrix
⚫
Printing paper: width is
（
57.5±0.5
）
mm, diameter is 30mm
⚫
Data memory: 500 groups
（
impact times: 32
～
1
）
⚫
Range of upper and lower limit: the same as measuring range
⚫
Working
Battery : 7.4V
⚫
Battery charger: 9V/1000mA
⚫
Full Charger power time:3
～
5 hour.
⚫
Continuous working period: approx. 150 h
⚫
Communication interface: USB
⚫
Accuracy and repeatability of displayed value, see table 5.
