Pendulum
The Pendulum is well established as a world leader in its field. Originally designed in the 1940s in the US, the instrument was further developed in the 1960s at the UK Transport Research Laboratory for the testing of road surfaces. Today it is the industry standard for a vast array of surface testing applications, most recently including the testing of astro turf and wooden decking.
How does it work?
The Pendulum measures the frictional resistance between a rubber slider mounted on the end of a pendulum arm and the test surface. This provides highway and flooring engineers with a routine method of checking the resistance of wet and dry surfaces to slipping and skidding.
Scientific basis of measurement
The Pendulum is based on the Izod principle: a pendulum consisting of a tubular arm rotates about a spindle attached to a vertical pillar. At the end of the tubular arm a head of constant mass is fitted with a rubber slider. The pendulum is released from a horizontal position so that it strikes the sample surface with a constant velocity. The distance travelled by the head after striking the sample is determined by the friction of the sample surface. A reading of Skid Resistance Values is obtained.
| Accessories Included |
| Carrying Case |
Sturdy case with dense foam inserts giving excelent protection |
| 'F' Scale |
Built in, for use with small slider set for 76mm slide length. (PSV test) |
| Set of 6 sliders (large or small) |
Built in, for use with small slider set for 76mm slide length. (PSV test) |
| 125-127mm setting gauge |
used to set slide length for road / floor testing |
| Brush |
For removing unwanted dirt or grit from area to be tested |
| C Spanner |
For attaching and releasing arm to rotating head |
| 17mm Spanner |
For fitting rear foot |
| Allen Keys |
For various adjustments |
| Water Spray Bottle |
For wetting surface to be tested |
| Feet pads |
For placing under levelling feet when on soft ground |
| Operating Instructions |
A guide to road, floor and PSV testing |
| Calibration Certificate |
Despatched calibrated to BS EN1097-8: 2000 (accredited under ISO 9001:2000) |
The Pendulum download PDF