CN112505605A - Calibration system and method - Google Patents
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- CN112505605A CN112505605A CN202011482509.6A CN202011482509A CN112505605A CN 112505605 A CN112505605 A CN 112505605A CN 202011482509 A CN202011482509 A CN 202011482509A CN 112505605 A CN112505605 A CN 112505605A
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- 238000005259 measurement Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 4
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- 230000002159 abnormal effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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Abstract
The application provides a calibration system and a method, which relate to the technical field of meters, a signal acquisition device in the calibration system can determine a parameter value of a target signal according to a calibration expression when the target signal is acquired, and the calibration expression is determined according to a reference source, so the acquisition precision of the signal acquisition device in the calibration system is higher. The calibration system includes: calibration device and signal acquisition device. The calibration device comprises at least one reference source, a power supply and a calibration interface, and is connected with the signal acquisition device through the calibration interface; and the power supply is used for providing working power supply for the calibration device. And the signal acquisition device is used for determining the calibration expression under the condition of detecting the first reference source and also used for determining the parameter value of the target signal according to the calibration expression under the condition of acquiring the target signal. The first reference source is any one of the at least one reference source.
Description
Technical Field
The present application relates to the field of meter technologies, and in particular, to a calibration system and method.
Background
The existing signal acquisition device can acquire voltage signals and current signals of equipment, so that the automatic control of the equipment is realized. However, the current signal acquisition device has low acquisition accuracy, and cannot meet the user requirements of some scenes (for example, scenes with high requirements on the accuracy of the monitoring signals, such as solar power supply, telecommunication base stations, and the like) requiring accurate monitoring of voltage signals and current signals.
Disclosure of Invention
The application provides a calibration system and a calibration method, which can improve the acquisition precision of a signal acquisition device.
In order to achieve the purpose, the technical scheme is as follows:
in a first aspect, the present application provides a calibration system comprising a calibration device and a signal acquisition device. The calibration device comprises at least one reference source, a power supply and a calibration interface, and is connected with the signal acquisition device through the calibration interface; and the power supply is used for providing working power supply for the calibration device. And the signal acquisition device is used for determining the calibration expression under the condition of detecting the first reference source and also used for determining the parameter value of the target signal according to the calibration expression under the condition of acquiring the target signal. The first reference source is any one of the at least one reference source.
In the calibration system provided by the application, a reference source in the calibration device can provide a stable and high-precision measurement standard for the signal acquisition device, and the signal acquisition device can determine a self calibration expression according to the reference source when detecting the reference source. In this way, when the signal acquisition device is acquiring the target signal, the parameter value of the target signal can be determined according to the calibration expression. The calibration expression is determined according to a stable reference source of a measurement standard, so that the acquisition precision of the signal acquisition device in the calibration system provided by the application is higher.
Optionally, in a possible design, the signal acquisition device is specifically configured to: the measured values are acquired in the case of detection of the first reference source, and the calibration expression is determined from the measured values and the reference values of the first reference source.
Optionally, in another possible design, the "at least one reference source" may include: a 1.25V reference source and a 2.5V reference source.
Optionally, in another possible design, the "signal acquisition device" includes: the system comprises a multi-path acquisition unit, a time base unit, a main control unit and a multi-path selector;
each of the multiple paths of acquisition units is used for acquiring one path of signal;
the time base unit is used for providing a time sequence control reference for the main control unit;
the main control unit is used for determining a control signal according to the time base unit;
and the multiplexer is used for switching the first acquisition unit into the second acquisition unit according to the control signal determined by the main control unit. The first acquisition unit and the second acquisition unit are any two of the multi-path acquisition units.
Optionally, in another possible design, the "multi-path collecting unit" may include M voltage collecting units and N current collecting units; m and N are both positive integers.
Alternatively, in another possible design, the value of M is less than or equal to N.
Optionally, in another possible design, the "signal acquisition device" may further include a switch control interface, and the signal acquisition device is connected to the air switch through the switch control interface.
Optionally, in another possible design, the "signal acquisition device" may further include an analog-to-digital converter; the analog-to-digital converter is connected with the multiplexer and the main control unit.
Optionally, in another possible design, the "calibration apparatus" may further include a channel switching circuit, and the "calibration interface" may include a channel switching control interface;
the calibration device is also used for switching the acquisition unit to be calibrated through the channel switching circuit and the channel switching control interface.
Optionally, in another possible design, the "calibration interface" may further include: connecting a status interface; and the connection state interface is used for representing whether the connection state of the calibration device and the signal acquisition device is normal or not.
In a second aspect, the present application provides a calibration method, which may be applied to the calibration system provided in the first aspect or any design manner of the first aspect.
For the description of the second aspect in the present application, reference may be made to the detailed description of the first aspect; in addition, for the beneficial effects described in the second aspect, reference may be made to the beneficial effect analysis of the first aspect, which is not described herein again.
In the present application, the names of the devices included in the above-described calibration system do not constitute limitations on the devices or functional modules (or units) themselves, which may appear by other names in an actual implementation. Insofar as the functions of the respective devices or functional modules (or units) are similar to those of the present application, they are within the scope of the claims of the present application and their equivalents.
These and other aspects of the present application will be more readily apparent from the following description.
Drawings
Fig. 1 is a schematic structural diagram of a calibration system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a signal acquisition device according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another signal acquisition device according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another signal acquisition device according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of another signal acquisition device according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of another signal acquisition device according to an embodiment of the present disclosure;
FIG. 7 is a schematic structural diagram of another calibration system provided in an embodiment of the present application;
fig. 8 is a schematic flowchart of a calibration method according to an embodiment of the present application;
fig. 9 is a schematic flowchart of a multi-channel signal acquisition method according to an embodiment of the present application.
Detailed Description
The calibration system and method provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone.
The terms "first" and "second" and the like in the description and drawings of the present application are used for distinguishing different objects or for distinguishing different processes for the same object, and are not used for describing a specific order of the objects.
Furthermore, the terms "including" and "having," and any variations thereof, as referred to in the description of the present application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
In the description of the present application, the meaning of "a plurality" means two or more unless otherwise specified.
The existing signal acquisition device can acquire voltage signals and current signals of equipment, so that the automatic control of the equipment is realized. However, the current signal acquisition device has low acquisition accuracy, and cannot meet the user requirements of some scenes (for example, scenes with high requirements on the accuracy of the monitoring signals, such as solar power supply, telecommunication base stations, and the like) requiring accurate monitoring of voltage signals and current signals.
In view of the above problems in the prior art, an embodiment of the present application provides a calibration system and a method, where a signal acquisition device in the calibration system may determine a parameter value of a target signal according to a calibration expression when acquiring the target signal, and the calibration expression is determined based on a reference source, so that the signal acquisition device in the calibration system provided by the present application has a higher acquisition precision.
The signal acquisition device in this application embodiment can be the direct current table, and of course, in practical application, signal acquisition device still can be for other strapping tables that are used for signal acquisition, and this application embodiment does not limit to this. In the following description of the embodiments of the present application, unless explicitly stated otherwise, the signal acquisition device is taken as an example of a dc table for description.
Referring to fig. 1, a possible structure of a calibration system provided in an embodiment of the present application is shown. As shown in fig. 1, the calibration system includes a calibration device 01 and a signal acquisition device 02.
The calibration device 01 comprises at least one reference source, a power supply and a calibration interface; the calibration device 01 is connected with the signal acquisition device 02 through a calibration interface; and the power supply is used for providing working power supply for the calibration device 01.
It should be understood that fig. 1 illustrates, as an example, a case where the calibration apparatus 01 has only one reference source, and in practical applications, there may be a plurality of reference sources in the calibration apparatus 01, which is not limited in this embodiment of the present application.
Optionally, in one possible implementation, the reference source may include a 1.25V reference source and a 2.5V reference source.
Generally, the chip in the calibration apparatus 01 is sensitive to the references with two accuracies, i.e. the 1.25V reference source and the 2.5V reference source, so the 1.25V reference source and the 2.5V reference source may be selected in the embodiment of the present application. Of course, in practical application, other reference sources may also be selected, which is not limited in this application embodiment.
In a possible implementation, the power supply may be an isolated power supply, which can be isolated from an external power supply while providing an operating power supply for the calibration apparatus 01.
In particular, the signal acquisition device 02 is configured to determine the calibration expression in the case of detecting the first reference source; when the signal acquisition device 02 is acquiring the target signal, the parameter value of the target signal may be determined according to the calibration expression. Wherein the first reference source is any one of the at least one reference source.
Illustratively, the target signal may be a voltage signal or a current signal acquired by the acquisition unit.
Optionally, in a possible implementation manner, when detecting the first reference source, the signal acquisition device 02 may obtain a measurement value of itself for the first reference source, and then may determine the calibration expression according to the measurement value and the reference value of the first reference source.
For example, after the signal acquisition device 02 is connected to the calibration device 01, and when the signal acquisition device 02 measures a 1.25V reference source, a measurement value is 1V, the signal acquisition device 02 may determine an error coefficient according to the reference value 1.25V of the 1.25V reference source and the measurement value 1V, and then determine a calibration expression, and when the signal acquisition device 02 acquires a target signal, the measurement result may be calibrated according to the calibration expression to determine a parameter value of the target signal.
Optionally, referring to fig. 2, an embodiment of the present application further provides a signal acquisition device 02. As shown in fig. 2, the signal acquisition device 02 may include a multi-path acquisition unit, a time base unit, a main control unit, and a multiplexer.
Each of the multiple paths of acquisition units is used for acquiring one path of signal. And the time base unit is used for providing a time sequence control reference for the main control unit. And the main control unit is used for determining the control signal according to the time base unit. And the multiplexer is used for switching the first acquisition unit into the second acquisition unit according to the control signal determined by the main control unit.
For example, if each of the acquisition units acquires a signal 100 times per second, that is, acquires a signal every 10 milliseconds, the timing control reference of the time base unit may be that a first acquisition unit acquires a signal in the first 10 milliseconds of the preset time period, a second acquisition unit acquires a signal in the second 10 milliseconds of the preset time period, and a third acquisition unit acquires a signal in the third 10 milliseconds of the preset time period, so as to loop. In addition, the main control unit may determine a control signal according to the timing control reference of the time base unit and send the control signal to the multiplexer, for example, when the first 10 milliseconds ends, the main control unit determines a control signal, and the control signal at this time is used to instruct the multiplexer to switch the current acquisition channel from the first acquisition unit to the second acquisition unit; at the end of the second 10 milliseconds, the master control unit determines a control signal that instructs the multiplexer to switch the current acquisition channel from the second acquisition unit to the third acquisition unit, and so on.
The first acquisition unit, the second acquisition unit and the third acquisition unit are any three of the multi-path acquisition units. The preset time period may be a time period determined in advance by a human.
The number of channels for acquiring signals by the existing signal acquisition device 02 is limited (that is, the number of acquisition units is limited), signals such as current and voltage need to be acquired at multiple positions in some application scenes at present, a plurality of signal acquisition devices 02 are generally needed to be arranged for realization, and wiring is difficult. The signal acquisition device 02 provided by the embodiment of the application comprises multiple acquisition units, multiple acquisition can be realized through one signal acquisition device 02, the wiring difficulty is reduced, and the signal acquisition device is suitable for scenes needing to acquire multiple signals, such as solar power supply, telecommunication base stations and the like. It can be understood that, in practical applications, the signal acquisition device 02 in the embodiment of the present application may also be applied to other signal acquisition scenarios, which are not limited in the embodiment of the present application.
Optionally, as shown in fig. 3, the multi-path collecting unit may include M voltage collecting units and N current collecting units; m and N are both positive integers.
Illustratively, the multi-path collecting unit may include 2 voltage collecting units and 20 current collecting units.
For example, the voltage measurement range of the signal acquisition device 02 provided by the embodiment of the present application may be 0 to 60V.
Because the voltage of normal operation of general consumers is basically the same (generally 220V), and the current of normal operation of different consumers is generally different (for example, the current of normal operation of an air conditioner and a television is different). Therefore, when the signal acquisition device acquires the signal of each electric device, the voltage of any one electric device can be acquired, but the current of each electric device needs to be acquired. Therefore, optionally, in a possible implementation manner, the value of M is less than or equal to N, that is, the number of voltage acquisition units in the multi-path acquisition units is less than or equal to the number of current acquisition units.
Optionally, as shown in fig. 4, the signal acquisition device 02 further includes an analog-to-digital converter (a/D converter), and the a/D converter is connected to the multiplexer and the main control unit. For example, after the multiplexer switches the acquisition channel from the first acquisition unit to the second acquisition unit, the a/D converter may convert the electrical signal acquired by the second acquisition unit into a digital signal.
In practical application, the current collecting unit generally comprises a mutual inductor which is clamped outside a coil of an electric wire to generate weak current, and the current collecting unit collects the current. And voltage acquisition unit is when the voltage of collection equipment, is directly connected with equipment through acquisition circuit, so, as shown in figure 4, can carry out optoisolation to the voltage signal that voltage acquisition unit gathered, avoid appearing the normal operating that the short circuit influences other equipment. After the collected voltage signal is optically isolated, the signal can be further amplified to improve sampling accuracy. In addition, the amplified signal can also realize impedance matching, and the line loss is reduced to the maximum extent.
Optionally, in order to further improve the acquisition accuracy of the signal acquisition device 02, the a/D converter in the embodiment of the present application may adopt a high-accuracy a/D converter.
Optionally, as shown in fig. 5, the signal acquisition device 02 further includes a storage unit. The storage unit is connected with the main control unit. After the a/D converter converts the acquired electrical signals into digital signals, the converted digital signals can be sent to the main control unit, and the main control unit processes the converted digital signals. In addition, the main control unit can transmit the converted digital signals to the storage unit, and the storage unit performs storage backup, so that power-off data loss is avoided. For example, the memory cell provided by the embodiment of the present application can store 11 thousands of currents, voltages or other signals.
Optionally, in a possible implementation manner, the signal acquisition device 02 further includes: the switch control interface, signal acquisition device 02 can pass through the air switch of switch control interface connection.
For example, when the signal acquisition device 02 is applied to a telecommunication room, the signal acquisition device 02 may be connected to an air switch through a switch control interface, and then may control the switching value to control the opening and closing of a door, a lamp, and other equipment in the room.
In one possible implementation, the switch control interface may be an RS485 serial port. Of course, in practical applications, the switch control interface may also be another interface, which is not limited in this embodiment of the present application. Illustratively, the switch control interface can also be an RS232 serial port.
As shown in fig. 6, the signal acquisition device 02 includes a plurality of RS485 serial ports and RS232 serial ports, and the signal acquisition device 02 can communicate with an external device through the plurality of RS485 serial ports and the RS232 serial ports.
Optionally, as shown in fig. 7, in a possible implementation manner, the calibration apparatus 01 further includes a channel switching circuit, and the calibration interface includes a channel switching control interface. The calibration device 01 is further configured to switch the acquisition unit to be calibrated through the channel switching control interface.
Illustratively, when the multiplexer switches the current acquisition channel from the first acquisition unit to the second acquisition unit, the calibration apparatus 01 switches the acquisition unit to be calibrated from the first acquisition unit to the second acquisition unit through the channel switching control interface.
Optionally, in a possible implementation manner, the calibration interface in the calibration apparatus 01 may further include: connecting a status interface; and the connection state interface is used for representing whether the connection state of the calibration device 01 and the signal acquisition device 02 is normal or not.
Illustratively, when the connection state interface represents that the connection state of the calibration device 01 and the signal acquisition device 02 is abnormal, the calibration device 01 may send out an alarm message.
In summary, in the calibration system provided in the embodiment of the present application, the reference source in the calibration device may provide a stable and high-precision measurement standard for the signal acquisition device, and the signal acquisition device may determine its own calibration expression according to the reference source when detecting the reference source. In this way, when the signal acquisition device is acquiring the target signal, the parameter value of the target signal can be determined according to the calibration expression. The calibration expression is determined based on a stable reference source of the measurement standard, so that the acquisition accuracy of the signal acquisition device in the calibration system provided by the embodiment of the application is higher.
It should be understood that, in practical applications, other hardware or software systems (for example, an internal chip is also included in the calibration apparatus) are also included in the signal acquisition apparatus and the calibration apparatus, and only components that may be used in the embodiments of the present application are described herein, and do not form a specific limitation on the signal acquisition apparatus and the calibration apparatus.
The calibration method provided by the embodiment of the present application is described below with reference to any calibration system in the foregoing embodiments. As shown in fig. 8, an embodiment of the present application provides a calibration method, which may include S101-S102:
s101, the signal acquisition device determines a calibration expression under the condition of detecting the first reference source.
S102, the signal acquisition device determines a parameter value of the target signal according to the calibration expression under the condition of acquiring the target signal.
Referring to fig. 9, an embodiment of the present application further provides a multipath signal acquisition method, which is applied to any signal acquisition device in the foregoing embodiments. As shown in fig. 9, the method may include S201-S202:
s201, the main control unit determines a control signal according to the time sequence control reference of the time base unit.
S202, the multiplexer switches the first acquisition unit into the second acquisition unit according to the control signal determined by the main control unit.
The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (11)
1. A calibration system, comprising: the device comprises a calibration device and a signal acquisition device;
the calibration device comprises: at least one reference source, a power supply and a calibration interface; the calibration device is connected with the signal acquisition device through the calibration interface; the power supply is used for providing a working power supply for the calibration device;
the signal acquisition device is used for determining a calibration expression under the condition of detecting the first reference source; the first reference source is any one of the at least one reference source;
the signal acquisition device is further used for determining the parameter value of the target signal according to the calibration expression under the condition of acquiring the target signal.
2. The calibration system according to claim 1, wherein the signal acquisition device is specifically configured to:
and acquiring a measured value under the condition of detecting the first reference source, and determining the calibration expression according to the measured value and the reference value of the first reference source.
3. The calibration system of claim 1, wherein the at least one reference source comprises: a 1.25V reference source and a 2.5V reference source.
4. The calibration system according to any one of claims 1 to 3, wherein the signal acquisition device comprises: the system comprises a multi-path acquisition unit, a time base unit, a main control unit and a multi-path selector;
each of the multiple paths of acquisition units is used for acquiring a path of signal;
the time base unit is used for providing a time sequence control reference for the main control unit;
the master control unit is used for determining a control signal according to the time base unit;
the multiplexer is used for switching the first acquisition unit into the second acquisition unit according to the control signal determined by the main control unit; the first acquisition unit and the second acquisition unit are any two of the multi-path acquisition units.
5. The calibration system of claim 4, wherein the multiple acquisition units comprise M voltage acquisition units and N current acquisition units; m and N are both positive integers.
6. The calibration system of claim 5, wherein the value of M is less than or equal to N.
7. The calibration system of claim 4, wherein the signal acquisition device further comprises: a switch control interface;
the signal acquisition device is also used for connecting an air switch through the switch control interface.
8. The calibration system of claim 4, wherein the signal acquisition device further comprises: an analog-to-digital converter; the analog-to-digital converter is connected with the multiplexer and the main control unit.
9. The calibration system of claim 4, wherein the calibration device further comprises a channel switching circuit, the calibration interface comprising a channel switching control interface;
the calibration device is also used for switching the acquisition unit to be calibrated through the channel switching circuit and the channel switching control interface.
10. The calibration system of claim 9, wherein the calibration interface further comprises: connecting a status interface; and the connection state interface is used for representing whether the connection state of the calibration device and the signal acquisition device is normal or not.
11. A calibration method applied to a calibration system according to any one of claims 1 to 10.
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| CN202011482509.6A CN112505605A (en) | 2020-12-14 | 2020-12-14 | Calibration system and method |
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| CN202011482509.6A CN112505605A (en) | 2020-12-14 | 2020-12-14 | Calibration system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406550A (en) * | 2021-07-29 | 2021-09-17 | 深圳国人无线通信有限公司 | Current detection calibration method and system |
| CN113406467A (en) * | 2021-06-01 | 2021-09-17 | 长江存储科技有限责任公司 | Auxiliary measuring circuit, measuring circuit and semiconductor device electric signal measuring method |
-
2020
- 2020-12-14 CN CN202011482509.6A patent/CN112505605A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406467A (en) * | 2021-06-01 | 2021-09-17 | 长江存储科技有限责任公司 | Auxiliary measuring circuit, measuring circuit and semiconductor device electric signal measuring method |
| CN113406467B (en) * | 2021-06-01 | 2022-06-24 | 长江存储科技有限责任公司 | Auxiliary measuring circuit, measuring circuit and semiconductor device electric signal measuring method |
| CN113406550A (en) * | 2021-07-29 | 2021-09-17 | 深圳国人无线通信有限公司 | Current detection calibration method and system |
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