ISO 6487:2015 道路車両—衝撃試験における測定技術—計装 | ページ 6

3.1

data channel

all the instrumentation from, and including a single transducer (or multiple transducers, the outputs of which are combined in some specified way), to, and including any analysis procedures that may alter the frequency content or the amplitude content of data

3.2

transducer

first device in a data channel (3.1) used to convert a physical quantity to be measured into a second quantity (such as an electrical voltage) which can be processed by the remainder of the channel

3.3

channel amplitude class

CAC

designation for a data channel (3.1) that meets certain amplitude characteristics as specified by this International Standard

Note 1 to entry: The CAC number is numerically equal to the upper limit of the measurement range which is equivalent to data channel full scale.

3.4

channel frequency class

CFC

frequency class designated by a number indicating that the channel frequency response lies within certain limits

Note 1 to entry: CFC XXX defines the frequency class with XXX = Frequency, F_H, in hertz.

3.5

calibration value

mean value measured and read during calibration of a data channel (3.1)

3.6

sensitivity

ratio of the output signal (in equivalent physical units) to the input signal (physical excitation) when an excitation is applied to the transducer (3.2)

3.7

sensitivity coefficient

slope of the straight line representing the best fit to the calibration values (3.5) determined by the method of least squares within the channel amplitude class (CAC) (3.3)

Note 1 to entry: Specific sensors such as seat belt sensors, torque sensors, and multi-axial force sensors may require a specific calibration procedure.

3.8

calibration factor of a data channel

arithmetic mean of the sensitivity coefficients (3.7) evaluated over frequencies evenly spaced on a logarithmic scale between F_L and F_H/2,5

Note 1 to entry: See Figure 2 and Figure 3.

3.9

non-linearity

ratio of the maximum difference (D_max) between the calibration value (3.5) and the value read from the best approximation of calibration values (3.5) expressed as a percentage of the channel amplitude class (CAC) (3.3)

Note 1 to entry: See Figure 1 and 4.5.4.

Figure 1 — Non-linearity

Key

1	input signal
2	output signal

NOTE Non-linearity = D_max/CAC * 100.

3.10

transverse sensitivity of a rectilinear transducer

sensitivity (3.6) to excitation in a nominal direction perpendicular to its sensitive axis

Note 1 to entry: The transverse sensitivity of a rectilinear transducer is usually a function of the nominal direction of the axis chosen.

Note 2 to entry: The cross sensitivity of force and bending moment transducers is complicated by the complexity of loading cases. At time of publication, this situation had yet to be resolved.

3.11

transverse sensitivity ratio of a rectilinear transducer

ratio of the transverse sensitivity of a rectilinear transducer (3.10) to its sensitivity along its sensitive axis

Note 1 to entry: The cross-sensitivity of force and bending moment transducers is complicated by the complexity of loading cases. At time of publication, this situation had yet to be resolved.

3.12

phase delay time of a data channel

time equal to the phase delay, expressed in radians, of a sinusoidal signal divided by the angular frequency of that signal and expressed in radians per second

3.13

environment

aggregate at a given moment of all external conditions and influences to which the data channel (3.1) is subject