Document ID: chunk:federal_register_of_legislation:F2017L01221:body:0:p15
Version: federal_register_of_legislation:F2017L01221
Segment Type: other
Provision Reference: 
Character Range: 39560–41726

∙ (f/f0) degrees for fourth order
  Φ = 294 ∙ (f/f0) degrees for eighth order
  The time delay for all filter orders is: t = (Φ/360) ∙ (1/f0)
2.4. Data sampling and digitizing
 At 30 Hz the signal amplitude changes by up to 18 per cent per millisecond. To limit dynamic errors caused by changing analogue inputs to 0.1 per cent, sampling or digitizing time shall be less than 32 μs. All pairs or sets of data samples to be compared shall be taken simultaneously or over a sufficiently short time period.
2.5. System requirements
 The data system shall have a resolution of 12 bits (±0.05 per cent) or more and an accuracy of ±0.1 per cent (2 lbs). Anti-aliasing filters shall be of order 4 or higher and the relevant data range fmax shall be 0 Hz to 30 Hz.
               For fourth order filters the pass-band frequency fo (from 0 Hz to frequency fo) shall be greater than 2.37 ∙ fmax if phase errors are subsequently adjusted in digital data processing, and greater than 5 ∙ fmax otherwise. For fourth order filters the data sampling frequency fs shall be greater than 13.4 ∙ fo.
* The category code may also be in the format L1, L2, L3 etc.
** See clause 3.1.
[*] * Former title of the Agreement: Agreement Concerning the Adoption of Uniform Conditions of Approval and Reciprocal Recognition of Approval for Motor Vehicle Equipment and Parts, done at Geneva on 20 March 1958.
[1] M1 and N1 categories of vehicles are defined in the Consolidated Resolution on the Construction of Vehicles (R.E.3.), document ECE/TRANS/WP.29/78/Rev.4, para. 2 -www.unece.org/trans/main/wp29/wp29wgs/wp29gen/wp29resolutions.html
[2]  As declared by the vehicle manufacturer.
[3] The distinguishing numbers of the Contracting Parties to the 1958 Agreement are reproduced in Annex 3 to the Consolidated Resolution on the Construction of Vehicles (R.E.3), document ECE/TRANS/WP.29/78/Rev. 4, Annex 3 - www.unece.org/trans/main/wp29/wp29wgs/wp29gen/wp29resolutions.html
[4] Distinguishing number of the country which has granted/extended/refused/withdrawn approval (see provisions in the regulation).
[5] Strike out what does not apply.
[6]  This number is given merely as an example.