1、 Operation method of rebound tester

1. Hold the impact rod against the surface of the concrete, lightly press the instrument to release the button, and when the pressure is released, the impact rod extends and the hook hangs the impact hammer.

2. Ensure that the axis of the instrument is always perpendicular to the surface of the concrete and slowly and evenly distributed

Apply pressure. After the impact hammer disengages and impacts the impact rod, the rebound of the hammer drives the pointer to move backwards to a certain position. When the reading mark on the pointer block shows a certain value on the scale, it is the rebound value.

3. Keep the instrument movement pressed against the concrete surface for reading and record the rebound value. If the conditions are not conducive to reading, you can press the button, lock the movement, and move the instrument to another location for reading.

4. Gradually reduce the pressure on the instrument, allowing the firing rod to extend from inside the instrument for the next use.

2、 Maintenance of rebound tester

Routine maintenance should be carried out when the rebound tester has any of the following conditions:

1. More than 2000 hits;

When there is doubt about the detection value;

3. The steel anvil calibration value is not qualified;

The conventional maintenance methods should meet the following requirements:

1. Loosen the hammer and remove the movement, then remove the hammer rod (take out the buffer compression spring inside) and the triple piece (hammer, tension spring, and tension spring seat);

2. Clean the various components of the movement with gasoline, especially the center guide rod, the inner holes and impact surfaces of the hammer and rod. After cleaning, apply a thin layer of clock oil or sewing machine oil on the central guide rod, and do not apply oil to other components;

3. Clean the inner wall of the casing, remove the scale, and check that the friction force of the pointer should be between 0.5-0.8N;

4. Do not rotate the zero adjustment screw that has been positioned and tightened on the tail cover;

5. Do not make or replace parts;

After maintenance, calibration tests should be conducted as required, with a calibration value of 80 ± 2.

3、 Calibration of rebound tester

When any of the following situations occur with the rebound instrument, it should be sent to the statutory department for calibration. The rebound instrument that passes the calibration should have a calibration certificate:

Before the new rebound tester is put into use;

2. Exceeding the validity period of the verification (valid for six months);

3. Accumulated hits exceeding 6000 times;

4. The steel anvil calibration value is not qualified after regular maintenance;

5. Suffering from severe impact or other damage.