Issue link: http://itf.uberflip.com/i/450983
10 1.2 Environmental Conditions To meet the Controlled Environment requirements noted above, a well-insulated room with double-glazed windows not exposed to sunshine, and a double-door 'air-lock' arrangement to reduce air leakage on entry and exit, are recommended. Control of temperature and humidity should be provided by a temperature and humidity control unit of an appropriate specification with regard to thermal capacity and control accuracy. Such a conditioner normally consists of two component parts: an internal fan unit and an external condenser unit with connecting piping. The specification of this conditioning equipment is primarily related to removing excess heat and moisture generated within the environment by electrical equipment and the bodies of the technicians working there. Such equipment must be capable of controlling the testing environment within the tolerances set down in Section 1.1. As well as controlling the environment, the conditioning equipment should also be independently monitored, and so temperature and humidity recorders together with a barometer are necessary. A permanent record of environmental conditions during conditioning and test should be kept. Balls selected for testing should be stored under such controlled conditions and exposed to circulating air for 'conditioning' for the required 24 hours prior to testing. 1.3 Laboratory and Test Equipment Mass – Test Method ITF TB 01/01: An electronic laboratory balance measuring in grams to at least two decimal places, to a capacity of 100 grams. Size – Test Method ITF TB 02/01: Two ring gauges with diameters of the upper and lower limits for the respective ball. In all tests for diameter, the ring gauge used shall consist of a metal plate (preferably non-corrosive) of uniform thickness of 0.318 cm (0.125 inches). In the case of Type 1 (fast speed) and Type 2 (medium speed) balls, plates with circular openings measuring 6.54 cm (2.57 inches) and 6.86 cm (2.70 inches) in diameter respectively shall be used. In the case of Type 3 (slow speed) balls, plates with circular openings measuring 7.00 cm (2.76 inches) and 7.30 cm (2.87 inches) in diameter respectively shall be used. In the case of stage 1 balls, plates with circular openings measuring 6.30 cm (2.48 inches) and 6.86 cm (2.70 inches) in diameter respectively shall be used. The inner surface of the gauge shall have a convex profile with a radius of 0.160 cm (0.063 inches). See Figure 1. Deformation – Test Method ITF TB 03/01: A modified Stevens Machine (i.e. one which measures forward deformation and return deformation) capable of applying a force along a diameter of a ball, and measuring the resulting deformation.