DHT-100 Leeb Hardness Tester manual instructions

I. Overview

DHT-100 Leeb Hardness Tester uses the Leeb principle to . The instrument is small in size and is especially suitable for testing in various working environments. Before using the instrument, please read the manual in detail to understand the performance of the instrument and master the use of the instrument.

2. Technical parameters

Display method: 128×64 LCD dot matrix liquid crystal display

Measuring range: HL 180～960 HRC 17.0～68.0 HRB 13.3～100.0

HS 5.0～99.9 HB 30～680 HV 80～999

Indication accuracy: relative error ±0.5% (HL=800), repeatability ±0.8%

Storage memory: Automatically store 1250 sets of measurement data. Expandable storage for 2500 groups.

Batch storage There are 12 batches, and each batch stores 100 sets of data.

Power supply: Two AAA batteries (AAA), can work continuously for not less than 48 hours (without backlight)

Automatic shutdown: automatic shutdown after 2 minutes of no operation

Operating environment: Operating temperature: -20°C ~ +40°C

Storage temperature: -30℃～+60℃

Dimensions: 108×62×25mm

Weight: 180g (without battery)

Deguang DHT－100 Leeb Hardness Tester Instruction Manual with Figure 1

Deguang DHT－100 Leeb Hardness Tester Instruction Manual with Figure 3

4. Operation method

4.1. Preparation before use

4.1.1. Instrument preparation

For newly purchased instruments, please refer to the contents of the packing list to check the instruments and accessories. If not complete, please contact the manufacturer in time ; if the instrument is damaged, please do not use it, and contact the manufacturer as soon as possible.

4.1.2. Requirements for the test piece

a) The surface temperature of the test piece cannot be overheated <120°C;

b) The requirements for the surface roughness of the test piece are as follows:

Deguang DHT－100 Leeb Hardness Tester Instruction Manual with Figure 4

4.1.3. Requirements of the Hardness Tester for the weight of the tested piece

a) Test pieces weighing more than 5kg do not need to be supported;

b) Specimens with overhanging parts and thin-walled specimens with a weight of 2-5kg are tested

Object support should be applied during the test to avoid the deformation, bending and movement of the specimen caused by the impact force;

c) If the weight is less than 2kg, it should be tightly coupled with the supporting body weighing more than 5kg. It is required that surface of the test piece and the coupling body should be flat and smooth. Needs to be perpendicular to the coupling plane.

4.1.4. Requirements for surface hardening layer of test pieces

If the hardened layer on the surface of the specimen is too thin, the impact force will penetrate the hardened layer and cause the Leeb shift value to be incorrect. The depth of surface hardening layer shall meet:

Deguang DHT－100 Leeb Hardness Tester Instruction Manual with Figure 5

4.1.5. The surface of the tested piece should not be magnetic.

4.1.6. A small support ring should be used for the test of the specimen whose curved surface radius is less than 30mm.

4.2. Sensor operation

4.2.1. Loading

Push the load sleeve down all the way, grab the impact body, and return the load sleeve.

Note: Do not spring back the loading sleeve freely to avoid damage to the sensor.

4.2.2. Positioning

Press the sensor against the workpiece surface in the selected measuring direction.

4.2.3. Release

Press the release button to release the impact body for measurement.

4.3. Instrument operation

The operation of the instrument is a full Chinese menu, and the operation is extremely simple. The following describes the operation of the instrument .

Deguang DHT－100 Leeb Hardness Tester Instruction Manual with Figure 6