ISO 19614:2017 伝統的な漢方薬—パルスグラフ力変換器 | ページ 2

3.1

pulse graph force transducer

transducer that can detect pulsation of the radial artery and its peripheral tissues as a mechanical quantity and convert it into an electrical signal output according to a certain pattern for the purpose of TCM pulse condition acquisition

Note 1 to entry: Transducers involved in this document only refer to pressure or force transducers.

3.2

calibration

process of recording input/output data through applied standard mechanical quantities to determine the performance of transducers

Note 1 to entry: The calibration unit of transducers may be the unit of either pressure or force.

3.3

radial artery pulse graph

pulse graph

electrical signal waveform converted from peripheral vascular pulsation at the radial artery, expressed in time-amplitude coordinates, hereafter referred to as pulse graph

3.4

effective plane

plane of transducers with the sensitivity during radial artery pulsation acquisition

Note 1 to entry: See Figure 1.

3.5

auxiliary plane

plane with no sensitivity and lower than the effective plane (3.4) of transducers

Note 1 to entry: See Figure 1.

3.6

applied plane

contact plane of transducers with patients during pulse graph acquisition, including the effective plane (3.4) and auxiliary plane (3.5)

Figure 1—Effective plane, auxiliary plane of transducers

a) Array transducer	b) Single transducer

Key

1	effective plane
2	auxiliary plane

3.7

output quantity

electrical signal quantity produced by a transducer, which is a function of a measurand

Note 1 to entry: See Figure 2.

Figure 2—Different transducers

a) Analog output with constant voltage source	b) Analog output with constant current source	c) Analog output with amplifier
d) Frequency output	e) Digital or other forms of output

Key

1	output+
2	input+
3	input-
4	output-

NOTE 1 The output format includes analog output (e.g. a continuous function of a measurand such as changes in voltage amplitude, voltage ratio, and capacitance) which can be classified into amplified and unamplified.

NOTE 2 Frequency output (i.e. the number of cycles or pulses per second as a function of a measurand) and frequency-modulated output (i.e. frequency deviation from a centre frequency) are also forms of analog output.

NOTE 3 Another output format is digital output which represents a measurand in the form of discrete quantities coded in a system of notation (e.g. binary code).

3.8

resistive bridge transducer

transducer receiving excitation (3.11) from alternating or direct electrical energy, the output of which is directly proportional to the product of the applied mechanical quantities and excitation

3.9

static signal

electrical signal transferred from the applied force

Note 1 to entry: See Figure 3.

3.10

dynamic signal

electrical signal transferred from pulsation at the radial artery and its peripheral tissues detected

Note 1 to entry: See Figure 3.

Figure 3—Static signal and dynamic signal

Key

X	amplitude
Y	time
1	static signal
2	dynamic signal

3.11

excitation

external energy (voltage or current) applied to a transducer for its proper operation

3.12

measuring range

set of values for a measurand for which the error of the transducer is intended to lie within specified limits

Note 1 to entry: See Figure 4.

[SOURCE: IEC 60747-14-1:2010, 3.2.11]

Figure 4—Output-measurand relationship of a linear-output sensor with an offset

Key

X	output (e.g. voltage)
Y	measurand (e.g. force)
1	offset
2	measuring range
3	full scale span (FSS)
4	full scale output (FSO); FSO = FSS + offset

3.13

full scale span

FSS

algebraic difference between the end-points of the transducer output

Note 1 to entry: The upper limit of the transducer output over the measuring range (3.12) is called the full scale output (FSO). This signal is the sum of the offset signal plus the full scale span.

[SOURCE:IEC 60747‑14‑1:2010, 3.2.4]

3.14

linearity

closeness between the calibration (3.2) curve and a specified straight line of the transducer

Note 1 to entry: This document adopts the end-point or terminal linearity. There are two methods for calculating linearity: end-point straight line fit or a least squares best line fit. While a least squares fit gives the “best case” linearity error, the calculations required are burdensome. Conversely, an end-point fit will give the “worst case” error and the calculations are more straightforward for the user. The result is called the end-point or terminal linearity.

[SOURCE:IEC 60747‑14‑1:2010, 3.2.7]

3.15

rated load

load value assigned to the transducer by the manufacturer

3.16

stability

ability of a transducer to maintain its performance characteristics for a certain period of time

Note 1 to entry: Stability is the ability of a transducer to reproduce output readings, obtained during the original calibration, and under constant room conditions, for a specified period of time. It is typically expressed as a percentage of FSO.

[SOURCE:IEC 60747‑14‑1:2010, 3.2.24]

3.17

hysteresis

maximum difference in output, at any measurand value, within the measuring range (3.12) when the value is approached first with an increasing and then a decreasing measurand

Note 1 to entry: Hysteresis is expressed in percent of FSO during one calibration cycle.

[SOURCE:IEC 60747‑14‑1:2010, 3.2.5]

3.18

drift

undesired change in transducer output, which is irrelevant to the measurand, caused by temperature change at a certain time interval

3.19

repeatability

ability of a transducer to reproduce output readings at room temperature, when the same measurand is applied to it consecutively, under the same conditions and in the same direction

[SOURCE:IEC 60747‑14‑1:2010, 3.2.17]

3.20

eccentricity

consistency among measurement values of different points applied with identical mechanical quantity on the same effective plane (3.4) of the tested transducer under the same measuring conditions

3.21

creep

change in output quantity (3.7) within a specified time when applying a measurand to the transducer quickly and then keeping all other external conditions constant

Note 1 to entry: See Figure 5.

Figure 5—Creep and creep recovery

Key

X	output
Y	time
1	positive creep
2	negative creep
3	positive creep recovery
4	negative creep recovery

3.22

input resistance

resistance measured across the excitation (3.11) terminal of the transducer

Note 1 to entry: It is sometimes called “excitation resistance”.

3.23

output resistance

effective resistance across the output terminals of the transducer presented to the associated external circuit

Note 1 to entry: It is sometimes called “signal resistance”.

3.24

testing mechanical quantity generator

apparatus which may generate force or pressure to test radial artery mechanical transducer