Document ID: chunk:federal_register_of_legislation:F2005L03990:front:0:p25
Version: federal_register_of_legislation:F2005L03990
Segment Type: other
Provision Reference: 
Character Range: 62192–64876

frequency of that signal (in radians/second).
1.11. Environment
 The aggregate, at a given moment, of all external conditions and influences to which the data channel is subjected.
2. PERFORMANCE REQUIREMENTS
2.1. Linearity error
 The absolute value of the linearity error of a data channel at any frequency in the CFC, shall be equal to or less than 2.5 per cent of the value of the CAC, over the whole measurement range.
2.2. Amplitude against frequency
 The frequency response of a data channel shall lie within the limiting curves given in figure 1. The zero dB line is determined by the calibration factor.
2.3. Phase delay time
 The phase delay time between the input and the output signals of a data channel shall be determined and shall not vary by more than 1/10 FH seconds between 0.03 FH and FH.
2.4. Time
2.4.1. Time base
 A time base shall be recorded and shall at least give 1/100 s with an accuracy of 1 per cent.
2.4.2. Relative time delay
 The relative time delay between the signal of two or more data channels, regardless of their frequency class, must not exceed 1 ms excluding delay caused by phase shift.
 Two or more data channels of which the signals are combined shall have the same frequency class and shall not have relative time delay greater than 1/10 FH seconds.
 This requirement applies to analogue signals as well as to synchronisation pulses and digital signals.
2.5. Transducer cross sensitivity
 The transducer cross sensitivity shall be less than 5 per cent in any direction.
2.6. Calibration
2.6.1. General
 A data channel shall be calibrated at least once a year against reference equipment traceable to known standards. The methods used to carry out a comparison with reference equipment shall not introduce an error greater than 1 per cent of the CAC. The use of the reference equipment is limited to the frequency range for which they have been calibrated. Subsystems of a data channel may be evaluated individually and the results factored into the accuracy of the total data channel. This can be done for example by an electrical signal of known amplitude simulating the output signal of the transducer which allows a check to be made on the gain factor of the data channel, excluding the transducer.
2.6.2. Accuracy of reference equipment for calibration
 The accuracy of the reference equipment shall be certified or endorsed by an official metrology service.
2.6.2.1. Static calibration
2.6.2.1.1. Accelerations
 The errors shall be less than ± 1.5 per cent of the channel amplitude class.
2.6.2.1.2. Forces
 The error shall be less than ± 1 per cent of the channel amplitude class.
2.6.2.1.3. Displacements
 The error shall be less than