phase II 900-398, Руководство пользователя

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Tech Support
9
Macro Vickers
Model No. 900 ‐ 398
Hardness Tester
3.1 Usage of the Instrument
3.1.1 Switch the power source on. The light source and the LCD screen are both lit up at
the same time. At this point, the LCD screen displays as follows:
D1/D2
：
Diagonal length of indention
；
HV
：
Vickers hardness value
；
T
：
Dwell time
；
N
：
Numbers of measurements
；
F
：
Testing force value
；
3.1.2 Once the working screen appears, you can revise the dwell time, testing force value and luminosity of light source,
etc according to operator’s requirement.
3.1.3 Rotate the protecting cover of the indenter to make the 20
╳
objective face the front of the instrument. (This
instrument is equipped with a positioning device, you will feel it click into a position socket when you rotate
the protecting cover. The general amplification is 200
╳
3.1.4 Place the standard block or the specimen on the testing table and then rotate the hand wheel to raise the table. When
the block or the specimen comes into the distance of 3~4 mm ( 20
╳
objective) under the objective, begin
observing the view through the eyepiece. At this point , in the center of the vision field of the eyepiece appears
a bright spot , which is alerting you that you are very close to the focusing plane. At this time raise the testing
table up slowly until the block or specimen surface forms a clear image in the micro eyepiece, which indicates
the focusing operation is completed. (The micro eyepiece, the objective and the working piece are in the
focusing state.)
3.1.5 The luminosity of the light source in the vision field can be regulated through the keys “LIGHT+” or “LIGHT-” on
the operational board.
3.1.6 If there is a need to have a large vision field on the block or on the specimen , just shift the 10
╳
objective in the
frontal direction of the instrument . At this time, the general amplification is 100
╳
. Both the 10
╳
objective and
the 20
╳
objective can be used for the measurement.
D1: HV:
D2: T:15 N:00
0.00Kgf F:294.2N
WELCOME USE
××× - ××
After 5 seconds,
the screen display
Dynamic valve of
testing force