CN112286138B - Resistance correction method for high-precision program-controlled direct-current resistor box - Google Patents
Resistance correction method for high-precision program-controlled direct-current resistor box Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/07—Programme control other than numerical control, i.e. in sequence controllers or logic controllers where the programme is defined in the fixed connection of electrical elements, e.g. potentiometers, counters, transistors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/50—Adjustable resistors structurally combined with switching arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a high-precision program-controlled direct-current resistor box and a resistor correction method, comprising the following steps: a controller; the keyboard module is connected with the input end of the controller, the keyboard input module is provided with a keyboard, and the keyboard is used for inputting resistance values; the display module is connected with the output end of the controller and is provided with a display screen; the resistor network module is provided with at least one rotary varistor device, and the rotary varistor is provided with an adjusting rotating handle; the motion control module is connected with the controller, motors with the same number as that of the rotary type variable resistance devices in the resistance network module are connected to the motion control module, and the motors are in transmission connection with the adjusting rotating handle; the invention can replace manual work to adjust the resistance value, has high adjustment speed and high accuracy, and improves the use efficiency; the resistance correction method can reduce the output error of the resistance box and improve the precision of the resistance box.
Description
Technical Field
The invention belongs to the technical field of resistor boxes, and particularly relates to a high-precision program-controlled direct-current resistor box and a resistor correction method.
Background
The resistor box is widely applied to a plurality of fields such as scientific research, metering, thermal engineering, factories, schools and the like and is used for electric measurement, verification, detection and the like. The old resistor boxes are all manually operated by adopting decimal switches, and the operation mode has the defects of low efficiency, complexity, high error probability of human factors, incapability of realizing automatic test and the like.
Therefore, the high-precision program-controlled direct-current resistor box capable of replacing manual resistance adjustment is required to be designed, the adjustment speed is high, the accuracy is high, and the use efficiency is improved to solve the technical problem faced at present.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the high-precision program-controlled direct-current resistor box which can replace manual resistance adjustment, has high adjustment speed and high accuracy and improves the use efficiency.
The technical scheme of the invention is as follows: high accuracy program control direct current resistance box includes: a controller; the keyboard module is connected with the input end of the controller, and is provided with a keyboard for inputting a resistance value; the display module is connected with the output end of the controller and is provided with a display screen; the resistor network module is provided with at least one rotary rheostat, and the rotary rheostat is provided with an adjusting rotating handle; the motion control module is connected with the controller, motors with the same number as the rotary type variable resistance devices in the resistance network module are connected to the motion control module, and the motors are in transmission connection with the adjusting rotating handles.
Seven rotary type varistors connected in series are arranged in the resistor network module, each rotary type varistors is provided with nine resistors connected in series, the resistance value of each resistor in each rotary type varistors is the same, a conducting strip is connected between two adjacent resistors, a first connecting end is connected to the resistor positioned at one end of each rotary type varistors, a guide pin is connected to the adjusting rotating handle, and a second connecting end is connected to the guide pin.
The resistance values in the seven rotary type variable resistance devices are 0.01Ω, 0.1Ω, 1Ω, 10Ω, 100deg.C, 1000Ω and 10000Ω in sequence.
The rotary rheostat is fixedly arranged on the bottom plate, an adjusting rotating handle of the rotary rheostat faces the middle plate, the motor and the adjusting rotating handle are correspondingly arranged on the middle plate, and the motor is in transmission connection with the adjusting rotating handle.
The motor is in transmission connection with the adjusting rotating handle through a coupler, and the coupler is an 8-shaped coupler.
The top plate, the middle plate and the bottom plate are parallel, and the cylinder supporting rods are fixedly supported between the top plate and the middle plate and between the middle plate and the bottom plate.
The control console is provided with a bedplate, the display screen and the keyboard are arranged on the bedplate, two wiring terminals are arranged on the bedplate, and two ends of the resistor network module are respectively connected with the two wiring terminals.
The resistance correction method of the high-precision program-controlled direct-current resistor box comprises the following steps of:
measuring inherent resistance C in circuit 0 ；
Actual measurement value s (j) of gear in each rotary type variable resistance device;
the given value of each gear in each rotary type variable resistance device is g (j), and the multiplying power correction value c (j) of each gear in the circuit is calculated according to the following formula:
splitting the actual resistance value according to the following formula:
the correction value sj of the actual resistance value is calculated according to the following formula:
and n is the number of the rotary type variable resistance devices, and the high-precision program control direct current resistance box is adjusted according to the correction value sj of the actual resistance value.
The resistance correction method of the high-precision program-controlled direct-current resistance box further comprises secondary correction, wherein the secondary correction comprises the following steps of:
splitting the correction value sj of the actual resistance value according to the following formula:
will beAs a given value g (j) of a corresponding gear in each rotary type variable resistance device, recalculating a corresponding actual measured value s (j), wherein the corresponding relation between g (j) and s (j) is as follows:
then, the result of the corresponding value sk of the once corrected correction value is calculated according to the following formula:
r=s-sk, which represents an absolute error R between the corresponding value of the corrected value after one correction and the actual resistance value s, the precision of the resistor box is R;
when (when)When the resistance value is higher than the actual resistance value, the high-precision program control direct current resistance box is regulated according to the correction value sj of the actual resistance value;
when (when)When the actual resistance value is calculated, the secondary correction value sj ' of the actual resistance value is obtained according to a formula sj ' =sj-r, and the high-precision program-controlled direct-current resistance box is adjusted according to the secondary correction value sj ' of the actual resistance value;
when (when)And when the actual resistance value is calculated according to the formula sj ' =sj+r, the secondary correction value sj ' of the actual resistance value is obtained, and the high-precision program-controlled direct-current resistance box is adjusted according to the secondary correction value sj ' of the actual resistance value.
The invention has the beneficial effects that:
(1) The invention can replace manual work to automatically complete the adjustment of the resistance value, has high adjustment speed and high accuracy and improves the use efficiency;
(2) The user inputs the resistance value through the keyboard, the resistance value can be displayed in real time in the display screen, and meanwhile, the motor drives the rotary type resistance changing device to finish adjustment, so that the adjustment speed is high;
(3) The manual intervention is not needed in the adjustment process, so that human factor errors can be avoided, and the adjustment accuracy is high;
(4) The resistance correction method can reduce the output error of the resistance box and improve the precision of the resistance box.
Drawings
Fig. 1 is a schematic block diagram of a high-precision programmable dc resistor box of the present invention.
FIG. 2 is a schematic diagram of a high-precision programmable DC resistor box according to the present invention.
FIG. 3 is a second schematic diagram of the high-precision programmable DC resistor box according to the present invention.
Fig. 4 is a schematic structural diagram of a rotary varistor according to the present invention.
FIG. 5 is a schematic diagram of a resistor network module according to the present invention.
FIG. 6 is a graph of a linear regression analysis between absolute error and set point for a resistance correction method for a high precision programmable DC resistance box of the present invention.
FIG. 7 is a schematic diagram of the calibration process in the method for calibrating the resistance of the high-precision programmable DC resistor box according to the present invention.
FIG. 8 is a flow chart of an algorithm for secondary correction of a high-precision programmable DC resistor box in the invention.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings and examples.
As shown in fig. 1 to 3, the high-precision program-controlled direct-current resistor box comprises: a controller; the keyboard module is connected with the input end of the controller, the keyboard input module is provided with a keyboard 402, and the keyboard 402 is used for inputting a resistance value; the display module is connected with the output end of the controller and is provided with a display screen 401; a resistor network module having at least one rotary varistor device 5, the rotary varistor device 5 having an adjustment stem 501; the motion control module is connected with the controller, and motors 6 with the same number as that of the rotary type variable resistance devices in the resistance network module are connected to the motion control module, and the motors 6 are used for driving the adjusting rotating handle 501 to rotate; in addition, the power supply module for supplying power to the direct-current resistor box is not described in detail because of the fact that the power supply module is in the prior art; in this embodiment, the resistor value is input through the keyboard 402 in the keyboard module, the controller acquires the input resistor value through collecting the level change of the keyboard module, the controller sends the collected resistor value to the display module, the resistor value is displayed on the display screen 301, the controller converts the collected resistor value into a control signal of the motor, the control signal is sent to the motion control module, the motion control module drives the corresponding motor to rotate, and the corresponding adjusting handle 501 is driven to rotate to adjust the resistor value of the rotary type resistor variable device 5, so that the automatic adjustment of the resistor value of the resistor box can be realized, the adjusting speed is high, human factor errors are avoided, the adjusting accuracy is ensured, and the automatic detection is conveniently realized by matching and linkage with external equipment.
As shown in fig. 4, the resistor network module has seven rotary type varistors 5 connected in series, each rotary type varistors 5 has nine resistors 503 connected in series, the resistance values of the resistors 503 in each rotary type varistors 5 are the same, a conductive sheet 504 is connected between two adjacent resistors 503, a first connecting end 505 is connected to the resistor 503 at one end of the rotary type varistors 5, a guide pin 502 is connected to an adjusting handle 501, a guide pin 502 is connected to a second connecting end 506, the guide pin 502 and the conductive sheet 504 at different positions can be connected and conducted by rotating the adjusting handle 501, the guide pin 502 is driven to rotate by rotating the adjusting handle 501, and different numbers of resistors 503 can be connected between the first connecting end 505 and the second connecting end 506 in series, so that adjustment of the connection resistance of the rotary type varistors 5 can be realized; each rotary type varistor device 5 is provided with ten conductive sheets 504 which are uniformly distributed along the circumference, the guide pins 502 need to rotate 36 degrees when moving between two adjacent conductive sheets 504, and a corresponding motor drives the regulating rotating handle 501 to rotate by taking a 36-degree rotation angle as a unit, so that the regulating rotating handle 501 is driven to drive the guide pins 502 to rotate, different numbers of resistors are connected into circuits, and the regulation of the resistance value of the rotary type varistor device 5 is realized; in addition, the first connection ends 505 and the second connection ends 506 of the two adjacent rotary type varistor devices 5 are connected, the first connection ends 505 and the second connection ends 506 of the two rotary type varistor devices 5 at both ends are connection terminals 403 of a resistor box, and the connection terminals are connected with an external circuit to output the regulated resistance value.
As a more specific embodiment of the rotary varistor device 5, as shown in fig. 5, the resistance values in the seven rotary varistor devices 5 are 0.01Ω, 0.1Ω, 1Ω, 10Ω, 100deg.OMEGA, 1000Ω, and 1000Ω in this order; the rotary type variable resistance device 5 with the resistance value of 0.01 omega can be adjusted to realize the adjustment between the resistance values of 0.01 omega and 0.09 omega; the rotary type variable resistance device 5 with the resistance value of 0.1 omega can be adjusted to realize the adjustment between the resistance values of 0.1 omega and 0.9 omega with the adjustment unit of 0.1 omega; the rotary variable resistance device 5 with the resistance value of 1 omega can be adjusted to realize the adjustment between the resistance values of 0 to 9 omega with the adjustment unit of 1 omega; the rotary variable resistance device 5 with the resistance value of 10 omega can be adjusted to realize the adjustment between the resistance values of 0 to 90 omega with the adjustment unit of 10 omega; the rotary variable resistance device 5 with the resistance value of 100 omega can be adjusted, so that the adjustment between the resistance values of 0-900 omega with the adjustment unit of 100 omega can be realized; the rotary variable resistance device 5 with the resistance value of 1000 omega can be adjusted, so that the adjustment between the resistance values of 0-9000 omega with the adjustment unit of 1000 omega can be realized; the rotary variable resistance device 5 with the resistance value of 10000 omega can be adjusted, so that the adjustment between the resistance values of 0-90000 omega with the adjustment unit of 10000 omega can be realized; therefore, the adjustment between the resistance values of 0.01 omega and 99999.99 omega with the adjustment unit of 0.01 omega can be realized; in addition, the resistance box can be adjusted by taking 0.01Ω as the minimum unit, and can be adjusted according to the difference between the resistance display value on the display screen 401 and the actual resistance value output by the connection terminal 403 in the detection process, so that the output precision and maintenance cost of the resistance box are further improved.
As a more specific implementation mode of the high-precision program-controlled direct-current resistor box, as shown in fig. 2 and 3, the high-precision program-controlled direct-current resistor box further comprises a top plate 3, a middle plate 2 and a bottom plate 1 which are sequentially arranged from top to bottom, a rotary rheostat 5 is fixedly arranged on the bottom plate 1, two rows of circular through holes matched with the rotary rheostat 5 are alternately formed in the bottom plate 1, mounting plates 502 are symmetrically arranged on two sides of the rotary rheostat 5, the rotary rheostat 5 is arranged in the circular mounting holes, the mounting plates 502 are fixed on the bottom plate 1 through bolts, an adjusting rotary handle 501 of the rotary rheostat 5 faces the middle plate 2, a motor 6 is correspondingly arranged on the middle plate 2, a motor 6 is fixed on the top of the middle plate 2, a motor shaft faces the adjusting rotary handle 501, a circular hole for the motor shaft to extend downwards is formed in the middle plate 2, the motor shaft of the motor 6 and the adjusting rotary handle 501 are in the same axis, and the motor 6 is in transmission connection with the adjusting rotary handle 501, and the motor shaft of the motor 6 is driven to rotate through the motor shaft of the motor 6 to drive the adjusting rotary handle 501 to adjust resistance; as a specific transmission mode between the motor 6 and the adjusting rotating handle 501, a motor shaft of the motor 6 is connected with the adjusting rotating handle 501 through a coupler 8, and the coupler 8 is an 8-shaped coupler.
As an installation mode between the top plate 3, the middle plate 2 and the bottom plate 1, the top plate 3, the middle plate 2 and the bottom plate 1 are parallel, and cylinder supporting rods 7 are fixedly supported between the top plate 3 and the middle plate 2 and between the middle plate 2 and the bottom plate 1; the supporting rods 7 are of a hexagonal prism structure made of copper, the top plate 3, the middle plate 2 and the bottom plate 1 are connected into an equipotential through the supporting rods 7, and the equipotential is grounded in the use process, so that electric shock accidents caused by electric leakage are avoided.
As a specific implementation mode of the console 4, the console 4 is provided with a bedplate 404, the bedplate 404 is fixed on the top of the top plate, the display 401 and the keyboard 402 are arranged on the bedplate 404, two wiring terminals 403 are arranged on the bedplate 404, two ends of the resistor network module are respectively connected with the two wiring terminals 403, and the two wiring terminals 403 output the regulated resistor outwards; the keyboard 402 has 0-9 number keys and decimal point keys, any number in 0-99999.99 can be input through the keyboard 402, the numbers on ten thousand, thousands, hundred, ten, one tenth and one hundred digits are respectively acquired by splitting the acquired numbers input by the keyboard 402, and according to the acquired numbers, the adjustment of the resistance value can be completed by driving the adjustment rotary handle 501 to rotate the angle of the number units through the corresponding motor, wherein the resistance value output in the resistance network module shown in fig. 5 is 11111.11 Ω.
In the above embodiment, the motor 6 may be a stepper motor or a servo motor, preferably a servo motor, and the control precision of the rotation angle is higher, so that the adjustment precision of the resistor box can be further improved, the motion control module may be a multi-axis controller capable of controlling at least seven motors, and the motion control module drives the motor to adjust the resistance value by receiving the control instruction produced by the controller.
In the resistor box in the above embodiment, the conductive elements such as the pins 502, the conductive sheets 504 and the wires have resistors, and since the actual output resistance value of the resistor box is equal to the input resistance value plus the resistance value of the conductive element, the actual input resistance value of the resistor box is greater than the actual output resistance value, and an error is caused, a resistance correction method is required to be designed to compensate the output resistance value of the resistor box.
The embodiment also comprises a resistance correction method of the high-precision program-controlled direct-current resistance box, wherein the working environment of the high-precision program-controlled direct-current resistance box is stable, namely the temperature, the air humidity, the wind speed and the like of the environment where the working is positioned do not change drastically, and the working environment does not influence the resistance materials of each gear in the resistance box; the inherent resistance of the connecting wire is 0.01Ω, and the contact resistance of the contact of the rotary varistor and the inherent resistance of the output terminal are far less than 0.01Ω, which are negligible; the temperature change of the resistor in each rotary type variable resistance device in the electrifying process is small, and the influence of the temperature change generated by the temperature change on the fluctuation of the resistor can be ignored; the absolute error of each gear resistor in the high-precision program-controlled direct-current resistor box and the measured value show a linear relation, and the reason for the assumption of the research is put forward on the analysis of the relation between the given value and the actual measured value of the gear in the high-precision program-controlled direct-current resistor box, and an analysis chart of the relation is shown in fig. 6.
According to the research assumption (linear relation is formed between absolute errors and measured values of each gear resistor in the high-precision program-controlled direct-current resistor box), the research establishes the following model to correct the required actual resistance value, and firstly, the model solves the correlation coefficient between the absolute errors and the measured values of each gear resistor, wherein the formula is as follows:
when the value of the correlation coefficient R exceeds 0.9, the present model tries to find a correction value for each gear magnification, specifically as follows:
the resistance correction method of the high-precision program-controlled direct-current resistor box comprises the following steps of:
measuring inherent resistance C in circuit 0 Namely, after the gear positions of the rotary type variable resistance devices in the high-precision program control direct-current resistor box are all adjusted to be connected with 0 omega, detecting that the resistance value of the output resistor of the rotary type variable resistance device at the moment is C 0 ；
Actual measurement value s (j) of gear in each rotary type variable resistance device;
the given value of each gear in each rotary type variable resistance device is g (j), and the correction value c (j) of each gear multiplying power in the circuit is calculated according to the following formula:
splitting the actual resistance value according to the following formula:
the correction value sj of the actual resistance value is calculated according to the following formula:
and n is the number of the rotary type variable resistance devices, and the high-precision program control direct current resistance box is adjusted according to the correction value sj of the actual resistance value.
Further, n in the above formula may be any positive integer greater than 1 theoretically, in this embodiment, n=7 in the above formula, that is, seven rotary resistance variable devices are provided, each rotary resistance variable device has nine gears, and the adjustment precision of the seven rotary resistance variable devices is 0.01Ω, 0.1Ω, 1Ω, 10Ω, 100deg.OMEGA, 1000Ω and 10000 Ω in sequence; taking the actual resistance= 88888.88 Ω as an example, the splitting is performed according to the above formula, and the result is as follows:
thus, it is possible to obtain:
after the required actual resistance value is split, the study corrects each gear number value s (i) in the actual required resistance value by using the obtained correction value of each gear multiplying power, and the specific process is shown in fig. 7, wherein s (1) represents 10 4 A gear; s (2) represents 10 3 A gear; s (3) represents 10 2 A gear; s (4) represents 10 1 A gear; s (5) represents 10 0 A gear; s (6) represents 10 -1 A gear; s (7) represents 10 -2 A gear.
The correction value sj of the actual resistance value is calculated according to the following formula:
the resistance inherent in the circuit is known through measurement, and is 0.00995 omega in the embodiment, so that the correction value sj of the actual resistance value can be calculated, and then the regulation is completed according to the high-precision program-controlled direct-current resistance box of the correction value sj of the actual resistance value.
In order to further reduce rounding errors in numerical calculation, as shown in fig. 8, the high-precision program-controlled dc resistor box is checked before being adjusted according to the correction value sj of the actual resistance value, and then adjusted after meeting the precision requirement, that is, the correction value sj of the actual resistance value required in the resistance correction method of the high-precision program-controlled dc resistor box is subjected to secondary correction, where the secondary correction includes the following steps:
splitting the correction value sj of the actual resistance value according to the following formula:
will beAs a given value g (j) of a corresponding gear in each rotary type variable resistance device, recalculating a corresponding actual measured value s (j), wherein the corresponding relation between g (j) and s (j) is as follows:
then, the result of the corresponding value of the once corrected correction value is calculated according to the following formula:
r=s-sk, which represents an absolute error R between the corresponding value of the corrected value after one correction and the actual resistance value s, the precision of the resistor box is R;
when (when)When the method is used, the correction value sj of the actual resistance value is directly output, and the high-precision program-controlled direct-current resistance box is adjusted according to the correction value sj of the actual resistance value;
when (when)When the actual resistance value is calculated, the secondary correction value sj ' of the actual resistance value is obtained according to a formula sj ' =sj-r, and the high-precision program-controlled direct-current resistance box is adjusted according to the secondary correction value sj ' of the actual resistance value;
when (when)And when the actual resistance value is calculated according to the formula sj ' =sj+r, the secondary correction value sj ' of the actual resistance value is obtained, and the high-precision program-controlled direct-current resistance box is adjusted according to the secondary correction value sj ' of the actual resistance value.
In the specific embodiment, seven rotary type resistance variators are provided, each rotary type resistance variators has nine gears, and the adjusting precision of the seven rotary type resistance variators is sequentially 0.01Ω, 0.1Ω, 1Ω, 10Ω, 100deg.OMEGA, 1000Ω and 10000 Ω, namely the adjusting precision of the high-precision program control direct current resistance box is 0.01Ω; here, taking the correction value sj= 88889.65 Ω of the actual resistance value as an example, as shown in fig. 8, the splitting is performed according to the above formula, and the result is as follows:
calculating the actual measurement value s (j) of each gear multiplying power again by taking sj (i), i=1, # and 7 as a given value g (j), wherein the corresponding relation between g (j) and s (j) is as follows:
then, the result of the corresponding value of the once corrected correction value is calculated according to the following formula:
r=s-sk, which represents an absolute error R between the corresponding value of the corrected value after one correction and the actual resistance value s, the precision of the resistor box is R;
when the R is less than or equal to 0.005, the correction result is in the precision (0.01Ω) requirement range of the high-precision program-controlled direct-current resistance box, meets the requirements, the correction value sj of the actual resistance value is directly output without secondary correction, and the high-precision program-controlled direct-current resistance box is adjusted according to the correction value sj of the actual resistance value;
when R is less than or equal to-0.005, the correction result is larger, the accuracy (0.01Ω) required range of the high-accuracy program-controlled direct-current resistance box is exceeded, the correction value sj of the actual resistance value needs secondary correction, the secondary correction value sj ' of the actual resistance value is obtained according to a formula sj ' =sj-0.01, and the high-accuracy program-controlled direct-current resistance box is adjusted according to the secondary correction value sj ' of the actual resistance value;
when R is more than or equal to 0.005, the correction result is smaller, the accuracy (0.01Ω) required range of the high-accuracy program-controlled direct-current resistor box is exceeded, the correction value sj of the actual resistance value needs to be corrected secondarily, the secondary correction value sj ' of the actual resistance value is obtained according to a formula sj ' =sj+0.01, and the high-accuracy program-controlled direct-current resistor box is adjusted according to the secondary correction value sj ' of the actual resistance value.
Claims (2)
1. The resistance correction method of the high-precision program-controlled direct-current resistor box is characterized by comprising the following steps of:
measuring inherent resistance C in circuit 0 ；
Actual measurement value s (j) of gear in each rotary type variable resistance device;
the given value of each gear in each rotary type variable resistance device is g (j), and the multiplying power correction value c (j) of each gear in the circuit is calculated according to the following formula:
splitting the actual resistance value according to the following formula:
the correction value sj of the actual resistance value is calculated according to the following formula:
s (i) is the number of each gear in the resistance value, n is the number of rotary type variable resistance devices, and the high-precision program control direct current resistance box is adjusted according to the correction value sj of the actual resistance value.
2. The method for correcting the resistance of a high-precision program-controlled direct-current resistor box according to claim 1, further comprising a secondary correction, the secondary correction comprising the steps of:
splitting the correction value sj of the actual resistance value according to the following formula:
sj (i) is a correction value of an actual resistance value of each gear, sj (i), i=1, … …, n is taken as a given value g (j) of a corresponding gear in each rotary type variable resistance device, and a corresponding actual measured value s (j) is recalculated, wherein the corresponding relation between g (j) and s (j) is as follows:
then, the result of the corresponding value sk of the once corrected correction value is calculated according to the following formula:
r=s-sk, which represents an absolute error R between the corresponding value of the corrected value after one correction and the actual resistance value s, the precision of the resistor box is R;
when (when)When the resistance value is higher than the actual resistance value, the high-precision program control direct current resistance box is regulated according to the correction value sj of the actual resistance value;
when (when)When the actual resistance value is calculated, the secondary correction value sj ' of the actual resistance value is obtained according to a formula sj ' =sj-r, and the high-precision program-controlled direct-current resistance box is adjusted according to the secondary correction value sj ' of the actual resistance value;
when (when)And when the actual resistance value is calculated according to the formula sj ' =sj+r, the secondary correction value sj ' of the actual resistance value is obtained, and the high-precision program-controlled direct-current resistance box is adjusted according to the secondary correction value sj ' of the actual resistance value.
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