11
Table 4-1
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
5
G
4
8
E
3
5
C
2
4
4.5 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
howl, and display the mean measured value.
NOTE:HL values tested by different impact devices are different,eg.780HLD≠780HLC
4.6 Notification
Replacing the impact device must be done during Power off. Otherwise the main body could not
identify the type of the impact device, and it may damage the circuit board of the main body.
You could not save the current test value if the impact time is less than the presetting times value.
Only type D and type DC of impact device have the function of strength test option. You can not
change the setting to strength testing when using other types of impact device. The setting would be
set to hardness testing automatically after replacing the impact device whether the setting is
hardness testing or not before.
Not all materials could convert to all hardness scale value. The hardness scale is reset to HL
automatically after changing the material. So select material firstly before changing the hardness
scale.
5 Operation Detail
5.1 Power On/Off
Press
to power on the instrument. Be sure to plug in the impact device before powering on. 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 screen as following:
The instrument can be turned off by pressing the
key while it is working. The tool has a special
memory that retains all of its settings even when the power is off.
Note: If the instrument is in power off condition, it will turns on automatically after the charge
power is connected.
