CN100457027C - Method for automatic aligning in human body fatty measuring instrument - Google Patents
Method for automatic aligning in human body fatty measuring instrument Download PDFInfo
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- CN100457027C CN100457027C CNB2007100445819A CN200710044581A CN100457027C CN 100457027 C CN100457027 C CN 100457027C CN B2007100445819 A CNB2007100445819 A CN B2007100445819A CN 200710044581 A CN200710044581 A CN 200710044581A CN 100457027 C CN100457027 C CN 100457027C
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Abstract
The present invention relates to an automatic correction method of human body fat measuring instrument. Said method is characterized by that between left electrode LI, left electrode LV, right electrode RI and right electrode RV a standard resistor R is mounted, and said invention utilizes chip computer assembler language program or C assembler language program and applies AC constant-current source to said standard resistor R to measure standard resistor R value, then utilizes said standard resistor R value and slope formula to calculate human body resistance value so as to ensure measurement accuracy of human body fat rate.
Description
Technical field
The present invention relates in a kind of human body fatty measuring instrument Calibration Method automatically, relate in particular to and a kind ofly carry out automatic Calibration Method as standard, belong to individual medical fat determination system technical field by measurement result with measuring resistance.
Background technology
Human body fatty measuring instrument is to be used to measure the intravital fat content of people, and data such as the height by user input, body weight, age, sex, calculates body fat rate and the comprehensive instrument of judging the fat or thin situation of human body.User is judged that correctly own fat content and fat or thin situation play good reference role.
Human body fatty measuring instrument is by using bio-electrical impedance (BIA) method, and as shown in Figure 1, the left hand of human body contacts with left electrode LI, LV, and the right hand contacts with right electrode RI, RV, utilizes the electrode on the instrument to contact with human body, measures the resistance of human body.Then according to formula:
Fat content=A * body weight-B * height+C * age+D * resistance+E
(* A, B, C, D, E are constant.)
Can calculate the fat content of human body.Because height, body weight, age, sex all are inputs in advance, the accuracy of the resistance that measures is directly connected to the accurate of final result.At present, because the factors such as discreteness of environment for use and components and parts may cause the instability of measurement data, thereby influence the accuracy of fat percentage.And original human body fatty measuring instrument does not carry out calibration process to measured value.
Summary of the invention
The purpose of this invention is to provide in a kind of human body fatty measuring instrument that can carry out calibration process to measured value Calibration Method automatically.
For realizing above purpose, technical scheme of the present invention provides automatic Calibration Method in a kind of human body fatty measuring instrument, it is characterized in that, and the measurement standard resistance R, as benchmark, its method is with its measured value:
The first step. a measuring resistance R is installed between the left electrode LI of human body fatty measuring instrument, left electrode LV, right electrode RI and right electrode RV are quadrupole, between measuring resistance R and left electrode LI, be connected with S7 by analog switch S3, between measuring resistance R and left electrode LV, be connected with S8 by analog switch S4, between measuring resistance R and right electrode RI, be connected with S5, between measuring resistance R and right electrode RV, be connected with S6 by analog switch S2 by analog switch S1;
Second step: program with single-chip microcomputer compilation or C language, operate on the human body fatty measuring instrument;
The 3rd step: after the start, software control analog switch S1-S4 conducting, S5-S8 ends, and adds AC constant-current source at measuring resistance R two ends then, records the measured value T of measuring resistance R;
The 4th step: the T value with recording calculates slope: slope=measured value/resistance value (L=T/R), value of calculation L and the last time correction value that reads from memory body are made comparisons, and if equate, illustrate that instrument is good, in normal operating conditions; If unequal, then software can be preserved value of calculation L down automatically, as standard;
The 5th step: software control analog switch S1-S4 ends, analog switch S5-S8 conducting, the measured contacts left hand with left electrode LI, LV, the right hand contacts with right electrode RI, RV, on left electrode LI, LV and right electrode RI, RV, add AC constant-current source then, measure the measured value T1 of the resistance of human body, calculate the human body resistance value, be accurate human body resistance value according to the formula of slope.
Described measuring resistance R selects the resistance that approaches the inside of human body resistance for use, is 200 Ω-1500 Ω.
The present invention has used analog switch to control the switching between measuring of somatometry and measuring resistance, by measurement standard resistance as standard value, make the measured value of instrument not be subjected to the influence of external environment or inner components and parts discreteness, start is under accurate, the stable situation measured value of instrument after measuring calibration automatically.
Advantage of the present invention is to guarantee that the measurement of body fat rate is accurate, error is little.
Description of drawings
Fig. 1 is the measuring principle figure of former body fat measuring instrument;
Fig. 2 is the measuring principle figure of human body fatty measuring instrument of the present invention;
Fig. 3 is automatic Calibration Method program flow diagram in the human body fatty measuring instrument of the present invention;
Fig. 4 is the measuring principle figure of embodiment 2 human body fatty measuring instruments.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 2, measuring principle figure for human body fatty measuring instrument of the present invention, left electrode LI at human body fatty measuring instrument, left side electrode LV, a measuring resistance R is installed between right electrode RI and right electrode RV are quadrupole, between measuring resistance R and left electrode LI, be connected with S7 by analog switch S3, between measuring resistance R and left electrode LV, be connected with S8 by analog switch S4, between measuring resistance R and right electrode RI, be connected with S5 by analog switch S1, between measuring resistance R and right electrode RV, be connected the switching of eight analog switch control electrodes and measuring resistance by analog switch S2 with S6.
As shown in Figure 3,, program, operate on the human body fatty measuring instrument with single-chip microcomputer compilation or C language for automatic Calibration Method program flow diagram in the human body fatty measuring instrument of the present invention; At first, after the human body fatty measuring instrument start, analog switch S1-S4 conducting, analog switch S5-S8 ends, and the outside adds an AC constant-current source measurement standard resistance R, the resistance of this measuring resistance should be selected the resistance that approaches the inside of human body resistance for use, to 1500 Ω, select the precision resistance of 1000 Ω as 200 Ω in this example for use, this moment, measured value was T=160, because resistance value is accurate R=1000 Ω, so just can calculate an accurate linear gradient L=T/R=160/1000=0.16.Then and the last time correction value that from memory body, reads make comparisons, if equate, illustrate that instrument is good, in normal operating conditions; If unequal, then L=0.16 is kept in the memory body, at this moment, this L=0.16 is exactly the exact value under the current state.At last, under the situation of measuring human body resistance, analog switch S1-S4 ends, analog switch S5-S8 conducting adds AC constant-current source then on left electrode LI, LV and right electrode RI, RV, record measured value T1=112, human body resistance R=T1/L=112/0.16=700 Ω then, can record accurate human body resistance value, thus, utilize this method just can reach the purpose of the accuracy of resistance measurement.
Reduce cost as need, change the level Four method among the figure into the secondary method, this method is suitable equally, in the secondary method, left electrode LI, LV can be merged into L, right electrode RI, RV are merged into R, S1, S3 connect measuring resistance R, and S5, S7 connect left and right sides pole piece respectively, as shown in Figure 4.
Implementation method is identical with the level Four method, S1, S3 conducting during the measurement standard resistance R, and S5, S7 end; S1, S3 end S5, S7 conducting when measuring human body resistance.
Claims (2)
1. Calibration Method automatically in the human body fatty measuring instrument is characterized in that, the measurement standard resistance R, and as benchmark, its method is with its measured value:
The first step. a measuring resistance R is installed between the left electrode LI of human body fatty measuring instrument, left electrode LV, right electrode RI and right electrode RV are quadrupole, between measuring resistance R and left electrode LI, be connected with S7 by analog switch S3, between measuring resistance R and left electrode LV, be connected with S8 by analog switch S4, between measuring resistance R and right electrode RI, be connected with S5, between measuring resistance R and right electrode RV, be connected with S6 by analog switch S2 by analog switch S1;
Second step: program with single-chip microcomputer compilation or C language, operate on the human body fatty measuring instrument;
The 3rd step: after the start, software control analog switch S1-S4 conducting, S5-S8 ends, and adds AC constant-current source at measuring resistance R two ends then, records the measured value T of measuring resistance R;
The 4th step: the T value with recording calculates slope: slope=measured value/resistance value (L=T/R), value of calculation L and the last time correction value that reads from memory body are made comparisons, and if equate, illustrate that instrument is good, in normal operating conditions; If unequal, then software can be preserved value of calculation L down automatically, as standard;
The 5th step: software control analog switch S1-S4 ends, analog switch S5-S8 conducting, the measured contacts left hand with left electrode LI, LV, the right hand contacts with right electrode RI, RV, on left electrode LI, LV and right electrode RI, RV, add AC constant-current source then, measure the measured value T1 of the resistance of human body, calculate the human body resistance value, be accurate human body resistance value according to the formula of slope.
2. automatic Calibration Method is characterized in that described measuring resistance R selects the resistance that approaches the inside of human body resistance for use in a kind of human body fatty measuring instrument according to claim 1, is 200 Ω-1500 Ω.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100445819A CN100457027C (en) | 2007-08-03 | 2007-08-03 | Method for automatic aligning in human body fatty measuring instrument |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100445819A CN100457027C (en) | 2007-08-03 | 2007-08-03 | Method for automatic aligning in human body fatty measuring instrument |
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| CN101099671A CN101099671A (en) | 2008-01-09 |
| CN100457027C true CN100457027C (en) | 2009-02-04 |
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| CNB2007100445819A Expired - Fee Related CN100457027C (en) | 2007-08-03 | 2007-08-03 | Method for automatic aligning in human body fatty measuring instrument |
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| CN107861013B (en) * | 2017-10-23 | 2020-12-22 | 金华市智甄通信设备有限公司 | Jig and method for preparing hand electrode |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2460045Y (en) * | 2001-01-16 | 2001-11-21 | 李金成 | Body height measuring device capable of measuring fat |
| US20040077969A1 (en) * | 2001-02-22 | 2004-04-22 | Tomohiro Onda | Apparatus for measuring body fat |
| CN1903120A (en) * | 2005-07-29 | 2007-01-31 | 浙江工业大学 | Apparatus for measuring fat in human body |
| CN1907220A (en) * | 2006-08-16 | 2007-02-07 | 中山市创源电子有限公司 | Human body impedance measuring apparatus and fat meter using same |
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- 2007-08-03 CN CNB2007100445819A patent/CN100457027C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2460045Y (en) * | 2001-01-16 | 2001-11-21 | 李金成 | Body height measuring device capable of measuring fat |
| US20040077969A1 (en) * | 2001-02-22 | 2004-04-22 | Tomohiro Onda | Apparatus for measuring body fat |
| CN1903120A (en) * | 2005-07-29 | 2007-01-31 | 浙江工业大学 | Apparatus for measuring fat in human body |
| CN1907220A (en) * | 2006-08-16 | 2007-02-07 | 中山市创源电子有限公司 | Human body impedance measuring apparatus and fat meter using same |
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