Adjustment and calibration of the measuring apparatus. 3.6.1 The electrical circuit of the photoelectric cell and of the indicating dial shall be adjustable so that the pointer can be reset at zero when the light flux passes through the smoke chamber filled with clean air or through a chamber having identical characteristics. 3.6.2 With the lamp switched off and the electrical measuring circuit open or short-circuited, the reading on the absorption-coefficient scale shall be ∞ , and it shall remain at ∞ with the measuring circuit reconnected. 3.6.3 An intermediate check shall be carried out by placing in the smoke chamber a screen representing a gas whose known light-absorption coefficient k, measured as described in paragraph 3.5.1 is between 1.6 m -1 and 1.8 m -1. The value of k must be known to within 0.025 m -1. UN ECE Regulation 24/03 39 The check consists in verifying that this value does not differ by more than 0.05 m -1 from that read on the opacimeter indicating dial when the screen is introduced between the source of light and the photoelectric cell.
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Samples: Agreement Concerning the Adoption of Uniform Conditions of Approval and Reciprocal Recognition of Approval for Motor Vehicle Equipment and Parts, Agreement Concerning the Adoption of Uniform Conditions of Approval and Reciprocal Recognition of Approval for Motor Vehicle Equipment and Parts
Adjustment and calibration of the measuring apparatus. 3.6.1 The electrical circuit of the photoelectric cell and of the indicating dial shall be adjustable so that the pointer can be reset at zero when the light flux passes through the smoke chamber filled with clean air or through a chamber having identical characteristics.
3.6.2 With the lamp switched off and the electrical measuring circuit open or short-circuited, the reading on the absorption-absorption- coefficient scale shall be ∞ , and it shall remain at ∞ with the measuring circuit reconnected.
3.6.3 An intermediate check shall be carried out by placing in the smoke chamber a screen representing a gas whose known light-light- absorption coefficient k, measured as described in paragraph paragraph
3.5.1 is between 1.6 m -1 and 1.8 m -1. The value of k must be known to within 0.025 m -1. UN ECE E/ECE/324 Rev.1/Add.23/Rev.2 Regulation 24/03 39 No. 24 Annex 8 page 3 The check consists in verifying that this value does not differ by more than 0.05 m -1 from that read on the opacimeter indicating dial when the screen is introduced between the source of light and the photoelectric cell.
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Adjustment and calibration of the measuring apparatus. 3.6.1 The electrical circuit of the photoelectric cell and of the indicating dial shall be adjustable so that the pointer can be reset at zero when the light flux passes through the smoke chamber filled with clean air or through a chamber having identical characteristics.
3.6.2 With the lamp switched off and the electrical measuring circuit open or short-circuited, the reading on the absorption-coefficient scale shall be ∞ , and it shall remain at ∞ with the measuring circuit reconnected.
3.6.3 An intermediate check shall be carried out by placing in the smoke chamber a screen representing a gas whose known light-absorption coefficient k, measured as described in paragraph 3.5.1 is between 1.6 m -1 and 1.8 m -1. The value of k must be known to within 0.025 m -1. UN ECE Regulation 24/03 39 The check consists in verifying that this value does not differ by more than 0.05 m -1 from that read on the opacimeter indicating dial when the screen is introduced between the source of light and the photoelectric cell.
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