CN106679777A - Electronic scale temperature compensation device and compensation method thereof - Google Patents

Abstract

The invention belongs to the technical field of an electronic scale, and more particularly relates to an electronic scale temperature compensation device and compensation method thereof. The electronic scale temperature compensation device comprises a temperature compensation unit. The temperature compensation unit comprises two sets of compensating pieces R5 and temperature influence compensation adjusting resistors R6 which are connected in parallel. The temperature compensation unit is connected in series with an input end of a sensor. The excitation voltage of the sensor is used as a power supply for the compensation device. The electronic scale temperature compensation device provided by the invention is installed between the sensor and a controller and directly adjusts the temperature compensation on an electronic scale so that the error caused by the temperature influence of the electronic scale is controlled within the standard range, thereby effectively reducing the errors of electronic scales for outdoor application, especially large electronic scales such as truck scales, rail scales and the like due to temperature changes; and the device compensates directly on the electronic scale, does not require additional test or metering devices, and does not need to modify the structure of any electronic scale, thus being low in compensation cost, simple and practical.

Description

Electronic scale temperature compensation means and its compensation method

Technical field

The invention belongs to electronic scale technical field, and in particular to electronic scale temperature compensation means and its compensation method.

Background technology

Most of electronic scale of existing market application includes that cutting load testing instrument and pressure-detecting device are answered with resistance Variant load sensor and resistance strain type pressure sensor use metal material conduct mostly as the sensing element for measuring The change of sensor elastomer perception or pressure.After elastomer stress, strain is produced, be attached to the resistance-strain on elastomer Piece experiences strain deformation, and resistance strain gage resistance is changed, and output voltage is changed by wheatstone bridge, Sensor signal is input into control unit, so as to realize measurement and control to load and pressure.Due to the elasticity of metal material Modulus change directly affects the size of strain, and then directly affects the output voltage of sensor, causes the rated output of sensor Error.Therefore the temperature system of the temperature error mainly due to strain gauge load cell elastomeric resilient modulus of weighing of electronic scale What number was caused, i.e., when temperature is low, sensor elastomer is hardened to deform and reduces, and is reduced so as to cause sensor to export.If do not carried out Compensation, can cause the sensor error of about 1%FS/10K.General sensor production producer is being passed using elastic modelling quantity compensating plate Compensated inside sensor, sensor temperature effect on rated output can reach 0.1%FS/10K or so after compensation.Due to temperature Characteristic is not that electronic scale demarcates the project checked and accepted, therefore the error that electronic scale temperature characterisitic is caused often is ignored, actually by The electronic scale error caused in the temperature effect on rated output error of strain gauge load cell is often more much bigger than other errors, Under the conditions of limiting temperature, even more than 10 times of electronic scale error in itself.

Therefore not only the metering influence on goods high is big for general sensor temperature effect on rated output error, and is one Recessive error, is to embody in electronic scale demarcation, but often beyond several times of electronic scale error in itself cause it is huge Big loss.

The sensor error that there is more than 1%FS/10K is not compensated.Under the conditions of -30 DEG C of limiting temperatures, cause Error exceedes electronic scale error in itself more than 10 times.

If compensated on a sensor, general 0.1%FS/10K of compensation precision or so is caused under the conditions of -30 DEG C The error of sensor is 0.5%FS, causes more than the error 1%FS of electronic scale.And it is higher in experimentation cost, it is impossible to check electricity The error that the temperature influence of sub- scale is caused.In the case of limiting temperature, the error for causing exceed electronic scale error 3 in itself again with On.

The content of the invention

For above-mentioned technical problem, the present invention provides a kind of electronic scale temperature compensation means, to electronic scale (load or pressure Detection means) on strain gauge load cell carry out external compensation, sensor temperature effect on rated output can reach after compensation To within 0.02%FS/10K.Sensor temperature effect on rated output error is reduced 5-10 times, can typically reduce electronic scale temperature More than 5 times of degree influence error.

Specifically technical scheme is：

Electronic scale temperature compensation means, including temperature compensation unit, described temperature compensation unit include two groups it is in parallel Compensating plate R₅With temperature influence compensation adjustment resistance R₆；Described temperature compensation unit is connected in the input of sensor.With biography The driving voltage of sensor as compensation device power supply.

Adding compensation device declines sensor output voltage, is adjusted using the gain of adjustment electronic scale control unit It is whole, or electronic scale control software is modified, reach the purpose of transducer sensitivity adjustment.

What is optimized is designed as, also including power supply unit of voltage regulation and sensitivity adjustment unit；Described power supply unit of voltage regulation is Electronic scale temperature compensation means provides power supply, and described temperature compensation unit is according to the defeated of temperature difference adjust automatically compensation device Go out voltage, described sensitivity adjustment unit is used to adjust the change of the transducer sensitivity caused by electronic scale compensation device.

Described power supply unit of voltage regulation includes full-bridge rectification, capacitor filtering and three terminal regulator voltage stabilizing, is electronic scale temperature Compensation device provides+5v and -5v power supplys.

Described temperature compensation unit includes two groups of compensating plate R in parallel₅With temperature influence compensation adjustment resistance R₆；It is described Temperature compensation unit be connected in the input of sensor.

Described sensitivity adjustment unit is operational amplifier, three terminal regulator and sensitivity adjustment resistance R_pConstitute adjustable Stable-pressure device, is adjusted to transducer excitation voltage, is consistent the sensitivity of sensor before and after compensation.

The compensation method of electronic scale temperature compensation means, including procedure below：

(1) sensitivity adjustment resistance R_pAdjustment

Temperature influence compensation adjustment resistance R₆Adjustment before accessing：

Sensitivity adjustment resistance R_pIt is accurate adjustable resistance；Under 20 DEG C of environment temperatures, first break-off signal influence compensation is adjusted Whole resistance R₆, then electronic scale temperature compensation means is serially connected between electronic scale control device and sensor, wherein " 1 ", " 2 " Terminal is the output end of sensitivity adjustment unit, is connect on the driving voltage of control device respectively, and " 3 ", " 4 " terminal are temperature-compensating The output end of unit, connects the input of sensor respectively, and opening electronic scale makes electronic scale be weighed state in zero load, adjusts sensitive Degree adjustment resistance R_pMake U₁₂=U₃₄, now in addition to temperature compensation capability, other metering states and the compensation device of electronic scale are accessed It is preceding consistent；

Sensitivity adjustment resistance R₆Adjusted after access：

Determine sensitivity adjustment resistance R₆After, under 20 DEG C of environment temperatures, cut-in temperature influence compensation adjustment resistance R₆, Opening electronic scale makes electronic scale be weighed state in zero load, adjustment sensitivity adjustment resistance R_pMake U₁₂=U₃₄, now except temperature is mended Repay outside ability, other metering states of electronic scale are consistent before being accessed with compensation device；

(2) temperature-compensating adjustment resistance R₆Determination

Temperature-compensating adjustment resistance R₆It is a precision resistance, R₆Value directly affect compensation precision, by the temperature of electronic scale Degree experiment and computing formula determine R₆Resistance value；

(a) electronic scale humid test

Just electronic scale temperature compensation means is serially connected between electronic scale control device and sensor, first break-off signal influence Compensation adjustment resistance R₆, adjustment sensitivity adjustment resistance R_p, detect following entry value：

T_h, T_s, T_l, ceiling temperature, standard test temperature and lower limit temperature when respectively testing；Ceiling temperature removes the noon The electronic scale and sensor surface temperature measured at 14, lower limit temperature take the electronic scale and sensor sheet measured during 2:00 AM Face temperature, normal temperature is 20 DEG C；

θ_nh, θ_ns, θ_nl, respectively T_h、T_sAnd T_lCorresponding rated load lower sensor exports the average value of reading；

If electronic scale sensor is many sensors (generally 4), now θ_nh, θ_ns, θ_nl, respectively T_h、T_sAnd T_l Lower 4 sensors of corresponding rated load export the average value of reading, and measurement is averaged for three times again.

The size of added rated load has no effect on test accuracy, general size for electronic scale nominal load 80%~ 100%.In order to reduce experimentation cost, counterweight can be replaced with load in kind (such as truck scale with truck), as long as protecting Card is loaded as same load every time.

R_h, R_s, R_l, respectively T_h、T_sAnd T_lCorresponding elastic modelling quantity compensating plate R₅Actual measurement resistance；

U, transducer excitation voltage；

W_nh、W_ns、W_ni, respectively in maximum temperature, normal temperature and minimum temperature under rated load electronic scale reading Number；

B () calculates sensor temperature effect on rated output S_tWith electronic scale temperature influence error G_t

Sensor temperature effect on rated output is during high temperature and during low temperature：

Because the preceding voltmeter of measurement resets every time, so：

Take S_thWith S_tiMiddle the greater is sensor rated temperature output influence S_t；

Electronic scale temperature influence error is during high temperature and during low temperature：

Take G_thWith G_tiMiddle the greater is that electronic scale temperature influences G_t；

C () calculates temperature influence compensation adjustment resistance R₆

Temperature-compensating adjustment resistance R is calculated according to following special formula₆：

In formula：

Sensitivity：

R_iIt is sensor input resistance, is measured by experiment；

R=2R_s；

ΔR_t=R_h-R_s；

(3) measurement sensor temperature effect on rated output and electronic scale temperature influence error after compensating：

Two temperature are influenceed into compensation adjustment resistance R₆Access in circuit, adjust sensitivity adjustment resistance R_p, after measurement compensation Sensor temperature effect on rated output and electronic scale temperature influence error；

Detection sensor and electronic scale tests below data：T_s、θ_ns、T_h、θ_nh、T_l、θ_nl、U、θ_n、W_nh、W_ns、W_ni；

Test data being substituted into S after must compensate in formula (1) and (2)_thAnd S_tl, wherein the greater is taken, it is sensor after compensation Temperature effect on rated output S_t；

Test data being substituted into G after must compensate in formula (3) and (4)_thAnd G_ti, wherein the greater is taken, it is electronic scale after compensation Temperature influence error G_t。

By the G after compensation_tDetermine the temperature error after electronic scale compensation.

A kind of electronic scale temperature compensation means that the present invention is provided, between sensor and controller, in electronic scale On directly carry out temperature-compensating adjustment, making the temperature of electronic scale influences the control errors that cause in critical field, effectively subtracts The electronic scale particularly large electronic scale error that for example truck scale, track scale etc. are caused due to temperature change of few outdoor utility；Should Device is directly compensated on electronic scale, it is not necessary to extra experiment and metering device, it is not required that change any electronic scale Structure, therefore cost of compensation is cheap, simple and practical.

Brief description of the drawings

Fig. 1 is the structural representation of embodiments of the invention 1；

Fig. 2 is the structural representation of embodiments of the invention 2；

Fig. 3 is the scheme of installation of embodiments of the invention 2.

Specific embodiment

The specific embodiment of the invention is described with reference to the drawings.

Embodiment 1

As shown in figure 1, using the electronic scale temperature compensation means of non sensitivity adjusting apparatus, including temperature compensation unit, Described temperature compensation unit includes two groups of compensating plate R in parallel₅With temperature influence compensation adjustment resistance R₆；Described temperature is mended Unit is repaid to be connected in the input of sensor.The driving voltage of sensor is directly used as the power supply of compensation device.

As shown in figures 1 and 3, temperature compensation unit is serially connected with sensor input, when environment temperature is raised, The resistance of the temperature-compensating plate in compensating unit increases, so that the driving voltage reduction U of sensor₃₄Reduce, sensor it is defeated Go out voltage θ reductions.Simultaneously because temperature rises, the elastic modelling quantity of the elastomer of sensor reduces (elastomer softening), sensor The deformation increase of foil gauge causes resistance to increase, and the output voltage θ for making sensor by the wheatstone bridge of sensor increases, and leads to Crossing the appropriate compensation of the present apparatus draws the elastic modelling quantity reduction that the θ reductions that compensating unit causes are exactly equal to the elastomer of sensor The θ for rising increases, and substantially reduces the temperature error of electronic scale.Compensating plate R₅With temperature influence compensation adjustment resistance R₆Determination with Scheme 2 is identical.

Adding compensation device declines sensor output voltage, is adjusted using the gain of adjustment electronic scale control unit It is whole, or electronic scale control software is modified, reach the purpose of transducer sensitivity adjustment.

Embodiment 2

As shown in Fig. 2 electronic scale temperature compensation means is by power supply unit of voltage regulation, temperature compensation unit and sensitivity adjustment list First three parts composition.Power supply unit of voltage regulation provides power supply for electronic scale temperature compensation means, temperature compensation unit according to temperature not With the output voltage (driving voltage of sensor) of adjust automatically compensation device, sensitivity adjustment device is used to adjust electronic scale benefit Repay the change of the transducer sensitivity caused by device.

(1) power supply unit of voltage regulation

It is made up of full-bridge rectification, capacitor filtering and three terminal regulator voltage stabilizing, for electronic scale temperature compensation means provides+5v With -5v power supplys.Two groups of full-bridge rectifications, capacitor filtering and three terminal regulators are sequentially connected, two three terminal regulators respectively with it is sensitive Spend the operational amplifier connection of adjustment unit.

(2) temperature compensation unit

As shown in Figures 2 and 3, temperature compensation unit is serially connected with sensor input, when environment temperature is raised, The resistance of the temperature-compensating plate in compensating unit increases, so that the driving voltage reduction U of sensor₃₄Reduce, sensor it is defeated Go out voltage θ reductions.Simultaneously because temperature rises, the elastic modelling quantity of the elastomer of sensor reduces (elastomer softening), sensor The deformation increase of foil gauge causes resistance to increase, and the output voltage θ for making sensor by the wheatstone bridge of sensor increases, and leads to Crossing the appropriate compensation of the present apparatus draws the elastic modelling quantity reduction that the θ reductions that compensating unit causes are exactly equal to the elastomer of sensor The θ for rising increases, and substantially reduces the temperature error of electronic scale.

(3) sensitivity adjustment unit

Because temperature compensation unit is connected in the input of sensor, and compensating plate R₅Compensation adjustment is influenceed with temperature Resistance R₆The resistance of itself can decline the driving voltage of sensor, so that the sensitivity of sensor declines.Sensitivity adjustment Unit is by operational amplifier, three terminal regulator and sensitivity adjustment resistance R_pAdjustable stable-pressure device is constituted, to sensor excitation electricity Pressure is adjusted, and is consistent the sensitivity of sensor before and after compensation, so that the metering of electronic scale is by the shadow of the present apparatus Ring.

The installation method of electronic scale temperature compensation means：

Electronic scale compensation device is directly installed on the stand of electronic scale, wherein compensating plate R₅It is pasted onto sensor bullet It is consistent with sensor and electronic balance body temperature to ensure the temperature for perceiving on gonosome outside or scale object table frame.Every sensor peace Fill a compensation device.

Electronic scale compensation device installs circuit as shown in figure 3, the electronic scale temperature compensation means is serially connected in into electronic scale control Between device processed and sensor, wherein " 1 ", " 2 " terminal are connect on the driving voltage of control device, " 3 ", " 4 " terminal connect sensor Input.In figure：R₁、R₂、R₃、R₄It is resistance strain gage；U is transducer excitation voltage, and θ is sensor output voltage.

The determination method of temperature-compensating plate, temperature influence compensation adjustment resistance and sensitivity adjustment resistance parameter：

(1) temperature-compensating plate R₅The determination of resistance

Compensating plate R₅Value be generally theoretical calculation gained or empirical data, the value of compensating plate has no effect on compensation precision, But the resistance of compensating plate must be sufficiently large, i.e., such as it is not added with temperature-compensating adjustment electric resistance sensor and should be at temperature overcompensation state, Generally select the elastic modelling quantity compensating plate of 30 Ω.

(2) sensitivity adjustment resistance R_pMethod of adjustment

R₆Adjustment before accessing：

Sensitivity adjustment resistance R_pIt is accurate adjustable resistance.Under 20 DEG C of environment temperatures, first break-off signal influence compensation is adjusted Whole resistance R₆, then electronic scale compensation device is connected in circuit as shown in Figure 3, open electronic scale make electronic scale be in weigh State (zero load), adjusts R_pMake U₁₂=U₃₄, now in addition to temperature compensation capability, other metering states and compensation device of electronic scale It is consistent before accessing.

R₆Adjusted after access：

Determine R₆After, under 20 DEG C of environment temperatures, cut-in temperature influence compensation adjustment resistance R₆, opening electronic scale makes electricity Sub- scale is in state (zero load) of weighing, and adjusts R_pMake U₁₂=U₃₄, now in addition to temperature compensation capability, other metering shapes of electronic scale State is consistent before being accessed with compensation device.

(3) temperature-compensating adjustment resistance R₆Determination

Temperature-compensating adjustment resistance R₆It is a precision resistance, R₆Value directly affect compensation precision, by the temperature of electronic scale Degree experiment and computing formula determine R₆Resistance value.

(a) electronic scale humid test

Electronic scale compensation device is installed in circuit as shown in Figure 2, first break-off signal influence compensation adjustment resistance R₆, adjust Whole sensitivity adjustment resistance R_p, carry out tests below and determine other parameters.Electronic scale preload (80% at full capacity) three times is (every time Interval 1min) after, each entry value in detection table 1.

Table 1 " theoretical com-pensation " load cell temperature characteristic test data afterwards

Note：Each value is measured three times altogether, is averaged, each measurement interval 1min, and every time before measurement, it is zero that load is unloaded, Digital voltmeter resets, and electronic scale resets.

T_h, T_s, T_lCeiling temperature, standard test temperature and lower limit temperature when respectively testing.Suggestion capping temperature takes The electronic scale and sensor surface temperature measured during at 14 in afternoon, it is proposed that remove the limit temperature and take the electronic scale measured during 2:00 AM With sensor surface temperature, normal temperature is 20 DEG C.General ceiling temperature and lower limit temperature difference are higher, and compensation effect is better.

θ_nh, θ_ns, θ_nlRespectively T_h、T_sAnd T_lCorresponding rated load lower sensor exports the average value of reading.

If electronic scale sensor is many sensors (generally 4), now θ_nh, θ_ns, θ_nl, respectively T_h、T_sAnd T_l Lower 4 sensors of corresponding rated load export the average value of reading, and measurement is averaged for three times again.

The size of added rated load has no effect on test accuracy, general size for electronic scale nominal load 80%~ 100%.In order to reduce experimentation cost, counterweight can be replaced with load in kind (such as truck scale with truck), as long as protecting Card is loaded as same load every time.

R_h, R_s, R_lRespectively T_h、T_sAnd T_lCorresponding elastic modelling quantity compensating plate actual measurement resistance.

U transducer excitation voltages.

W_nh、W_ns、W_niRespectively in maximum temperature, normal temperature and minimum temperature under rated load electronic scale reading.

2) sensor temperature effect on rated output S is calculated_tWith electronic scale temperature influence error G_t

Sensor temperature effect on rated output is during high temperature and during low temperature：

Because the preceding voltmeter of measurement resets every time, so：

Take S_thWith S_tiMiddle the greater is sensor rated temperature output influence S_t

Electronic scale temperature influence error is during high temperature and during low temperature：

Take G_thWith G_tiMiddle the greater is that electronic scale temperature influences G_t；

3) temperature influence compensation adjustment resistance R is calculated₆

Temperature-compensating adjustment resistance R is calculated according to following special formula₆：

In formula：

Sensitivity

R_iIt is sensor input resistance, is measured by experiment.

R=2R_s；

ΔR_t=R_h-R_s；

Experiment the data obtained substitution formula (6) is obtained into Δ R '；

Data are substituted into formula (5) and obtains R₆。

(3) measurement sensor temperature effect on rated output and electronic scale temperature influence error after compensating：

Rated output temperature-compensating adjustment resistance R₆Precision resister typically is used, as shown in Fig. 2 by two R₆Access electricity Lu Zhong, adjusts R_p, sensor temperature effect on rated output and electronic scale temperature influence error after measurement compensation.

Detection sensor and electronic scale, test data are shown in Table 2.

Load cell temperature characteristic test data after table 2 " present apparatus compensation method " compensation

Note：Each value is measured three times altogether, is averaged, each measurement interval 1min, and every time before measurement, it is zero that load is unloaded, Digital voltmeter resets, and electronic scale resets.

Test data being substituted into S after must compensate in formula (1) and (2)_thAnd S_tl, wherein the greater is taken, it is sensor after compensation Temperature effect on rated output S_t；

Test data being substituted into G after must compensate in formula (3) and (4)_thAnd G_ti, wherein the greater is taken, it is electronic scale after compensation Temperature influence error G_t。

By the G after compensation_tThe temperature error after electronic scale compensation can be determined, generally compensate for once can reach compensation The requirement of precision.

No matter whether the sensor used by electronic scale previously carried out rated output temperature-compensating, can use the present apparatus Temperature-compensating is carried out to electronic scale with this compensatory approach, and does not influence compensation precision.

With 100T electronic vehicle weighing apparatus, as a example by 50T goods Weighings, electronic scale error (not including temperature characterisitic) in itself As in 25Kg or so.Usual electronic scale demarcate be at a temperature of 20 DEG C, such as in the winter time -20 DEG C when measured with sensor sensor Temperature effect on rated output error 0.1%FS/10K influences error as electronic scale temperature, then the weighting error of electronic scale exists 200Kg, is 8 times of electronic scale error in itself, annual millions of if the electronic scale is used as the First Astronautic Research Institute for Measurement and Test of steel, coal etc. The loss of goods tons up to ten thousand of ton.

Using this compensation device in the case of -20 DEG C of limiting temperature, precision improves more than 5 times, it is possible to reduce 80% or so Weighting error loss.

Claims (5)

1. electronic scale temperature compensation means, it is characterised in that including temperature compensation unit, described temperature compensation unit includes two Group compensating plate R in parallel₅With temperature influence compensation adjustment resistance R₆；Described temperature compensation unit is connected on the input of sensor In end.

2. electronic scale temperature compensation means according to claim 1, it is characterised in that also including power supply unit of voltage regulation, spirit Sensitivity adjustment unit；Described power supply unit of voltage regulation provides power supply, described temperature-compensating list for electronic scale temperature compensation means According to the output voltage of temperature difference adjust automatically compensation device, described sensitivity adjustment unit is for adjusting electronic scale benefit for unit Repay the change of the transducer sensitivity caused by device.

3. electronic scale temperature compensation means according to claim 2, it is characterised in that described power supply unit of voltage regulation includes Full-bridge rectification, capacitor filtering and three terminal regulator voltage stabilizing, for electronic scale temperature compensation means provides+5v and -5v power supplys.

4. electronic scale temperature compensation means according to claim 2, it is characterised in that described sensitivity adjustment unit is Operational amplifier, three terminal regulator and sensitivity adjustment resistance R_pAdjustable stable-pressure device is constituted, transducer excitation voltage is carried out Adjustment, is consistent the sensitivity of sensor before and after compensation.

5. the electronic scale temperature compensation means according to any one of claim 2 to 4, it is characterised in that electronic scale temperature is mended Repay the compensation method of device, including procedure below：

(1) sensitivity adjustment resistance R_pAdjustment

Temperature influence compensation adjustment resistance R₆Adjustment before accessing：

Sensitivity adjustment resistance R_pIt is accurate adjustable resistance；Under 20 DEG C of environment temperatures, first break-off signal influences compensation adjustment resistance R₆, then electronic scale temperature compensation means is serially connected between electronic scale control device and sensor, wherein " 1 ", " 2 " terminal are The output end of sensitivity adjustment unit, connects on the driving voltage of control device respectively, and " 3 ", " 4 " terminal are temperature compensation unit Output end, connects the input of sensor respectively, and opening electronic scale makes electronic scale be weighed state in zero load, adjusts sensitivity adjustment Resistance R_pMake U₁₂=U₃₄, now in addition to temperature compensation capability, other metering states of electronic scale are consistent before being accessed with compensation device；

Sensitivity adjustment resistance R₆Adjusted after access：

Determine sensitivity adjustment resistance R₆After, under 20 DEG C of environment temperatures, cut-in temperature influence compensation adjustment resistance R₆, open Electronic scale makes electronic scale be weighed state in zero load, adjustment sensitivity adjustment resistance R_pMake U₁₂=U₃₄, now except temperature-compensating energy Outside power, other metering states of electronic scale are consistent before being accessed with compensation device；

(2) temperature-compensating adjustment resistance R₆Determination

Temperature-compensating adjustment resistance R₆It is a precision resistance, R₆Value directly affect compensation precision, tried by the temperature of electronic scale Test and determine R with computing formula₆Resistance value；

(a) electronic scale humid test

Electronic scale temperature compensation means is serially connected between electronic scale control device and sensor, first break-off signal influence compensation is adjusted Whole resistance R₆, adjustment sensitivity adjustment resistance R_p, detect following entry value：

T_h, T_s, T_l, ceiling temperature, standard test temperature and lower limit temperature when respectively testing；Ceiling temperature removes 14 points of noon When the electronic scale that measures and sensor surface temperature, lower limit temperature takes the electronic scale and sensor surface temperature measured during 2:00 AM Degree, normal temperature is 20 DEG C；

θ_nh, θ_ns, θ_nl, respectively T_h、T_sAnd T_lCorresponding rated load lower sensor exports the average value of reading；

Electronic scale sensor has 4, now θ_nh, θ_ns, θ_nl, respectively T_h、T_sAnd T_lLower 4 sensors of corresponding rated load The average value of reading is exported, and measurement is averaged for three times again；

R_h, R_s, R_l, respectively T_h、T_sAnd T_lCorresponding elastic modelling quantity compensating plate R₅Actual measurement resistance；

U, transducer excitation voltage；

W_nh、W_ns、W_ni, respectively in maximum temperature, normal temperature and minimum temperature under rated load electronic scale reading；

B () calculates sensor temperature effect on rated output S_tWith electronic scale temperature influence error G_t

Sensor temperature effect on rated output is during high temperature and during low temperature：

Because the preceding voltmeter of measurement resets every time, so：

$S_{th}=\frac{\frac{{\mathrm{\θ}}_{nh}-{\mathrm{\θ}}_{ns}}{{\mathrm{\θ}}_n}}{\frac{T_h-T_s}{10}}\×100\[\%FS/10K\]---\left(1\right)$

$S_{tl}=\frac{\frac{{\mathrm{\θ}}_{nl}-{\mathrm{\θ}}_{ns}}{{\mathrm{\θ}}_n}}{\frac{T_l-T_s}{10}}\×100\[\%FS/10K\]---\left(2\right)$

Take S_thWith S_tiMiddle the greater is sensor rated temperature output influence S_t；

Electronic scale temperature influence error is during high temperature and during low temperature：

$G_{th}=\frac{\frac{W_{nh}-W_{ns}}{W_n}}{\frac{T_h-T_s}{10}}\×100\[\%FS/10K\]---\left(3\right)$

$G_{tl}=\frac{\frac{W_{nl}-W_{ns}}{W_n}}{\frac{T_l-T_s}{10}}\×100\[\%FS/10K\]---\left(4\right)$

Take G_thWith G_tiMiddle the greater is that electronic scale temperature influences G_t；

C () calculates temperature influence compensation adjustment resistance R₆

Temperature-compensating adjustment resistance R is calculated according to following special formula₆：

$R_6=\frac{R\·{\mathrm{\ΔR}}^{\′}+\sqrt{{(R+{\mathrm{\ΔR}}^{\′})}^2+(2{\mathrm{\ΔR}}_t-{\mathrm{\ΔR}}^{\′}){\mathrm{\ΔR}}^{\′}\·R^2}}{2(2{\mathrm{\ΔR}}_t-{\mathrm{\ΔR}}^{\′})}---\left(5\right)$

In formula：

${\mathrm{\ΔR}}^{\′}=2{\mathrm{\ΔR}}_t-\frac{{\mathrm{\ΔS}}_t{(R_i+R)}^2}{S\·R_i-(R_i+R){\mathrm{\ΔS}}_t}---\left(6\right)$

Sensitivity：

${\mathrm{\ΔS}}_t=\frac{{\mathrm{\θ}}_{nh}-{\mathrm{\θ}}_{ns}}{U}=mV/V$

R_iIt is sensor input resistance, is measured by experiment；

R=2R_s

ΔR_t=R_h-R_s；

(3) measurement sensor temperature effect on rated output and electronic scale temperature influence error after compensating：

Two temperature are influenceed into compensation adjustment resistance R₆Access in circuit, adjust sensitivity adjustment resistance R_p, sensed after measurement compensation Device temperature effect on rated output and electronic scale temperature influence error；

Detection sensor and electronic scale tests below data：T_s、θ_ns、T_h、θ_nh、T_l、θ_nl、U、θ_n、W_nh、W_ns、W_ni；

Test data being substituted into S after must compensate in formula (1) and (2)_thAnd S_tl, wherein the greater is taken, it is the volume of sensor after compensation Determine output temperature influence S_t；

Test data being substituted into G after must compensate in formula (3) and (4)_thAnd G_ti, wherein the greater is taken, it is electronic scale temperature after compensation Influence error G_t；

By the G after compensation_tDetermine the temperature error after electronic scale compensation.