The Clegg Impact Hammer (Winter Sports, Cricket and Equestrian) is used to measure the hardness or shock absorption properties of a turf surface. It is suitable for assessing playing quality, consistency and safety of winter sports pitches. It can also be used to evaluate ball bounce and pace on cricket pitches and to ensure safety and consistency on equestrian surfaces.
A Clegg Impact Hammer assists with the preparation of quality and consistent playing surfaces in many sports. It can be used to aid decisions relating to playing surface quality and safety, as well as turfgrass health. The Clegg Impact Hammer soil tester is simple to use and produces straightforward and unbiased results.
In cricket the Clegg Impact Hammer soil test is a good predictor of both bounce and pace. This makes it a useful addition for an unbiased determination of playing surface quality.
Winter sports which have a risk of injury due to hard ground can similarly take advantage of the unbiased results provided by the Clegg Impact Hammer to aid decisions relating to safety. The results have been demonstrated to correlate closely with head injury severity indexes. In addition, the test can be used to indicate shock absorption and ball rebound qualities of the playing surface.
Use of Clegg Impact Hammer soil test on different sports surfaces+
|Surface||Drop Height (mm)||Target Reading (G*)||Source|
|Winter Sports||450||70 - 90||UEFA|
+ The Clegg Impact Hammer can also be used on other types of surface (e.g. tennis courts, bowling green, equestrian surfaces etc.)
*Deceleration due to gravity.
The Clegg Impact Hammer can also be used to assess surface consistency throughout the year and across different areas of a surface. This requires multiple measurements to be made across the surface of the pitch to calculate the degree of variation between measurements.
Suggested number of measurements to test for consistency
|Surface||Number of Locations|
|Winter Sports||20 - 70|
Operating Principle:- The Tester consists of a 2.25 kg compaction hammer operating within a vertical guide tube. The Hammer falls through the tube when released and strikes the surface under test, decelerating at a rate determined by the stiffness of the material within the region of impact. The readout registers the hardness values in units of Gravities (G). Harder surfaces will have a higher G reading.
Design:- The Clegg Impact Hammer Soil Tester is a very rugged design suitable for prolonged use in damp, dirty and harsh site environments. The CIST/883 readout unit is made from high strength alloy that has been proven to last for decades. The unit runs from 2 x AA batteries for typically 12 months operation. The CIST/883 Clegg Impact Soil Tester is a compact and reliable instrument. A Transit & Storage Case is included.
Test Procedure:- Carrying out a test is quick and straightforward. The guide tube is placed in position vertically on the surface to be tested. The digital readout is located on the guide tube during testing allowing easy use as there is no need to hold the readout in the hand. The hammer is raised to the desired height and then allowed to fall freely. This procedure is repeated three times. The reading achieved on the third drop being recorded as the measurement value. The test data is recorded in the instrument and it is downloadable to a computer wirelessly by Bluetooth.
|Hammer Weight||2.25 kg|
|Readout Display||Easy to view backlit vertical display clamped to Guide Tube.|
|Readout Range||Up to 500 Gravities (G)|
|Power Source||Two 'AA' cells.|
|Battery Life||Up to 12 months|
|Data Storage in Readout||Flash memory approx. 10,000 drop tests. Each stored field contains the time and date of the test and firmness.|
|Data Transfer Method||BluetoothTM Wireless data transfer to PC or laptop.|
|Data Files when Transferred||Comma Separated Variable (CSV) data for manipulation in 3rd party packages such as ExcelTM.||Transit & Storage Case||Wooden Case|
|Size & Weight (approx).||71 x 13 x 13 cm.
Instrument Weight: 4.6 kg
Packed weight in case: 10 kg
If you require any further information regarding the Clegg Hammer, contact our technical sales team on +44 (0)1902 440250.