Meteorological instrumentation Sample Clauses

Meteorological instrumentation. The meteorological instrumentation used to monitor the environmental conditions during the test shall meet the specifications of: ±1 °C or less for a temperature measuring device; ±1,0 m/s for a wind speed-measuring device;

Meteorological instrumentation. The meteorological instrumentation used to monitor the environmental conditions shall include the following: (i) A temperature measuring device which shall be accurate within ±1°C; (ii) A wind speed measuring device which shall be accurate within ±1.0 m/s.

Meteorological instrumentation. The meteorological instrumentation used to monitor the environmental conditions during the test shall include the following devices, which meet at least the given accuracy: (a) Temperature measuring device, ±1° C; (b) Wind speed-measuring device, ±1.0 m/s; (c) Barometric pressure measuring device, ±5 hPa; (d) A relative humidity measuring device, ±5 per cent. 2. Conditions of measurement 2.1. Test Site1 and ambient conditions The test site shall be substantially level. The surface of the test track shall be dry. The test site shall be such that when a small omni-directional noise source is placed on its surface at the central point (intersection of the microphone line PP' and the centre line of the vehicle lane CC'), deviations from hemispherical acoustic divergence shall not exceed ±1 dB. This condition is deemed to be satisfied if the following requirements are met: (a) Within a radius of 50 m from the centre of the track the space is free of large reflecting objects such as fences, rocks, bridges or buildings. (b) The test track and the surface of the site are dry and free from absorbing materials such as powdery snow, or loose debris. (c) In the vicinity of the microphone, there are no obstacle that could influence the acoustical field and no person is positioned between the microphone and the noise source. The meter observer is positioned so as not to influence the meter reading. Measurements shall not be made under adverse weather conditions. It must be ensured that the results are not affected by gusts of wind.