CN217902282U - Mutual inductor calibrator control system - Google Patents
Mutual inductor calibrator control system Download PDFInfo
- Publication number
- CN217902282U CN217902282U CN202221478899.4U CN202221478899U CN217902282U CN 217902282 U CN217902282 U CN 217902282U CN 202221478899 U CN202221478899 U CN 202221478899U CN 217902282 U CN217902282 U CN 217902282U
- Authority
- CN
- China
- Prior art keywords
- module
- control system
- chip microcomputer
- unit
- microcomputer controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The utility model provides a mutual-inductor check gauge control system, affiliated test instrument technical field, control system include information acquisition unit, information processing unit, display element, the control unit, protection unit, communication unit and power supply unit. The utility model discloses transformer calibrator control system specially makes for S level current transformer, and the main advantage is good linear quality and reliable and stable error reading, can guarantee when measuring S level current transformer that the linearity degree is not more than 1.5% in 190% ~ 0.2% within range. The control system can memorize the last test state, simplify the operation, judge the wiring state of the user, prompt error information, communicate with a microcomputer, manage the data acquired from the check meter, ensure that the data is more accurate, stable and reliable, expand the measurement range and be more perfect and reliable.
Description
Technical Field
The utility model belongs to the technical field of test instrument, concretely relates to mutual-inductor calibration appearance control system.
Background
The transformer calibrator is used for calibrating the technical performance of a voltage transformer and a current transformer on the site of a factory or in a laboratory, and is mainly used for calibrating and testing the errors of all levels of current-voltage transformers; the method can also be used for testing impedance and admittance, and has multi-range and multi-precision selection. In order to achieve the purpose, the transformer calibrator and related equipment form a complete full-automatic transformer calibrator.
The instrument for checking mutual inductor adopts the principle of difference method measurement, and utilizes electronic circuit to make the difference signal undergo the processes of decomposition, amplification, detection and transmission into integrating meter to make error display and measurement.
At present, for the traditional mutual inductor verification, a secondary test wire is needed to connect a calibrator, a standard mutual inductor and a to-be-verified mutual inductor. The control system of the special measuring instrument for the S-level current transformer also has the defects of low precision and stability, small measuring range, incapability of judging user wiring state prompt error information by a control system of the transformer calibrator, and the like.
SUMMERY OF THE UTILITY MODEL
The control system for the existing transformer calibrator has the defects of low precision and stability, small measurement range, incapability of judging the prompting error information of the wiring state of a user and the like in the detection of an S-level current transformer. The utility model provides a mutual-inductor check gauge control system can remember the test condition last time, and the simplified operation can judge user's wiring state, and suggestion error message with the computer communication, can manage the data that acquire from the check gauge, and data is more accurate reliable and more stable to enlarged measuring range, more perfect, more reliable. The specific technical scheme is as follows:
a control system of a mutual inductor calibrator comprises an information acquisition unit, an information processing unit, a display unit and an operation unit; the information acquisition unit is connected with the information processing unit, the information processing unit is connected with the display unit, and the operation unit is connected with the information processing unit;
the information processing unit comprises a single chip microcomputer controller 1, a simulation debugging module 2 and a function range switching module 10, wherein the simulation debugging module 2 is connected with the single chip microcomputer controller 1, and the function range switching module 10 is connected with the single chip microcomputer controller 1;
the display unit comprises a digital display module 7 and a functional range switching indication module 9, the digital display module 7 is connected with the single-chip microcomputer controller 1, and the digital display module 7 comprises three display screens which are respectively a dial indicator, a ratio difference meter and an angle difference meter; the functional range switching indication module 9 is connected with the single chip microcomputer controller 1;
the information acquisition unit comprises a signal acquisition module 8, and the signal acquisition module 8 is connected with the single chip microcomputer controller 1;
the circuit of the signal acquisition module 8 comprises 3A/D converters, a reference voltage source, schmidt trigger inverters 74HC14, resistors and capacitors, wherein the number of the A/D converters is 3, the 3A/D converters respectively correspond to a dial indicator, a ratio difference meter and an angle difference meter of the digital display module 7, and each A/D converter is connected with the Schmidt trigger inverter 74HC14, the resistors and the capacitors; the A/D converter reference corresponding to the dial indicator is provided by a reference voltage source.
In the above technical solution, the control system further includes a power supply unit, the power supply unit includes a power module 3, and the power module 3 is connected to the single chip microcomputer controller 1.
In the above technical solution, the control system further includes a protection unit, the protection unit includes a clock module 4 and a watchdog module 5, the clock module 4 is connected to the single chip microcomputer controller 1, and the watchdog module is connected to the single chip microcomputer controller 1.
In the above technical solution, the control system further includes a communication unit, the communication unit includes a communication module 6, and the communication module 6 is connected to the one-chip microcomputer controller 1.
In the above technical solution, the operation unit includes a key module 11, and the key module 11 is connected to the single chip microcomputer controller 1.
In the above technical solution, the connection is an electrical connection, and the electrical connection is a wired or wireless connection.
In the above technical solution, the key module 11 includes a function key, a range key and an accuracy key.
The function key has four functions of selecting CT, PT, Z and Y and is used for switching the instrument into four measuring states of current transformer error, voltage transformer error, current transformer load and voltage transformer load.
The range key is used for selecting the ranges of 5A, 2A and 1A according to the secondary rated working current of the tested mutual inductor when measuring the CT and the current load box; when the PT and the voltage load box are measured, 100V is selected according to the secondary rated working voltage of the measured mutual inductor,
100/3V range.
The precision key can be selected according to the accuracy of the tested transformer, and the impedance or the admittance to be tested is selected to be 0.6 omega, 6 omega, 60 omega or 0.3ms, 3ms and 30ms.
In the technical scheme, the control system can ensure that the linearity is not more than 1.5% within the range of 190% -0.2% when the control system is used for measuring the S-level current transformer.
In the above technical solution, the a/D converter is a CMOS monolithic 4-bit half a/D converter ICL7135.
In the above technical solution, the a/D converter includes two major parts, an analog circuit and a digital circuit; wherein; the analog circuit comprises a buffer, an integrator, a comparator, a zero-crossing detector, a polarity trigger and 4 groups of analog switches, wherein each A/D conversion period of the A/D converter is divided into 4 stages of automatic zero setting, forward integration, reverse integration and zero integration; the digital circuit comprises a 4-bit half counter, a latch, a bit gating and BCD code multi-path scanning circuit, a polarity trigger, a zero-crossing trigger and control logic.
In the above technical solution, the functional range switching indication module 10 includes a plurality of photocouplers, the circuit of the functional range switching indication module 9 includes 2 74HC164 chips, and a resistor and a light emitting diode are connected in series to a plurality of terminal branches of each 74HC164 chip.
In the technical scheme, the single chip microcomputer controller 1 can store a test state, memorizes the last test state after power failure and restart, and avoids unnecessary setting processes; the single chip microcomputer controller 1 automatically judges whether the wiring state is normal or not through front-end signals and data prompts, and gives corresponding prompts.
The utility model discloses a mutual-inductor calibration equipment control system compares with prior art, and beneficial effect is:
1. the utility model discloses transformer calibrator control system specially makes for S level current transformer, and the main advantage is good linear quality and reliable and stable error reading, can guarantee when measuring S level current transformer that the linearity is not more than 1.5% in 190% ~ 0.2% the scope. The signal acquisition module formed by the A/D converter ICL7135 has high accuracy, and the accuracy bits are +/-1 word within the +/-20000 counting range.
The circuit of the signal acquisition module in the circuit comprises a high-accuracy CMOS single-chip 4-bit half A/D converter ICL7135, a reference voltage source, a resistor, a capacitor and the like. The CMOS monolithic 4-bit half A/D converter ICL7135 belongs to a large-scale integrated circuit, and comprises an analog circuit and a digital circuit, wherein the analog circuit mainly comprises a buffer, an integrator, a comparator, a zero-crossing detector, a polarity trigger and 4 groups of analog switches. Each a/D conversion cycle is divided into 4 stages of auto-zero, forward integration, reverse integration and zero integration. The digital circuit mainly comprises a 4-bit half counter, a latch, a bit gating and BCD code multi-path scanning circuit, a polarity trigger, a zero-crossing trigger and control logic. Its advantage is: 1. the accuracy is high, and the accuracy bits in the range of +/-20000 counting are +/-1 word. 2. The zero setting can be automatically carried out, and the reading is ensured to be zero when zero volt input is carried out. 3. Input impedance higher than 10 9 Ω, input leakage current of only 1pA (typical value), allowing differential outputAnd (6) adding.
2. The function range switching module and the indicating module thereof comprise a photoelectric coupler, a resistor, a 74HC164 chip and a light emitting diode. The photoelectric coupler is also called as photoelectric isolator, optical coupler for short, and its working principle is that a signal is added at input end of photoelectric coupler to make luminous source give out light, and the intensity of light is dependent on the magnitude of exciting current, and after said light is irradiated on the light receiver packaged together, the photoelectric effect can produce photoelectric current, and said photoelectric current can be led out from output end of light receiver so as to implement conversion of electricity-light-electricity. The optical coupler transmits electrical signals by using light as a medium, has a good isolation effect on input and output electrical signals, and therefore, is widely applied to various circuits. An optical coupler generally consists of three parts, light transmission, light reception and signal amplification. Because the input and the output of the optical coupler are isolated from each other, the electric signal transmission has the characteristics of unidirectionality and the like, thereby having good electric insulation capability and anti-interference capability. The 74HC164 chip is a digital chip, and the inside is a high-speed silicon gate CMOS circuit, and the pins are compatible with a low-power consumption Schottky TTL (LSTTL) series. The 74HC164 chip is an 8-bit serial-in parallel-out, edge triggered shift register, with serial-in data input by DSA, DSB, data shifted to the right by one bit at each rising edge of the clock CP, data anded by DSA and DSB, and setup time satisfied before the rising edge arrives. An active low reset signal will directly clear the register to low. The multi-group control indication realized by the device occupies less single chip interface lines, and can well realize function range switching and indication functions.
3. The utility model discloses mutual-inductor check gauge control system mainly used electric power system electric current, voltage transformer's test and examination, the watchdog module makes the protect function of instrument self more perfect, more reliable.
4. The utility model discloses mutual-inductor check gauge numerical value can direct reading, makes the reading more directly perceived more convenient.
5. The single chip microcomputer controller can store the test state, memorizes the last test state after power failure and restart, and avoids unnecessary setting processes, so that the transformer calibrator control system can memorize the last test state, and operation is simplified.
6. The single chip microcomputer controller automatically judges whether the wiring state is normal or not through front-end signal and data prompt, corresponding prompt is given, and therefore the fact that the transformer calibrator control system can judge the wiring state of a user and prompt error information is achieved.
7. And a communication module of the control system of the mutual inductor calibrator is communicated with a microcomputer, and can manage data acquired from the calibrator.
8. The transformer calibrator control system is convenient to operate, rapid in measurement, more accurate, more stable and more reliable in data, and the measurement range is expanded.
9. The utility model discloses mutual-inductor check gauge control system is used for the examination and the test of current-voltage mutual-inductor at different levels, also can be used to the test of impedance, admittance.
Drawings
Fig. 1 is the utility model relates to a mutual-inductor check gauge control system's schematic diagram, wherein: the system comprises a single chip microcomputer controller, a 2-simulation debugging module, a 3-power supply module, a 4-clock module, a 5-watchdog module, a 6-communication module, a 7-digital display module, an 8-signal acquisition module, a 9-functional range switching indication module, a 10-functional range switching module and an 11-key module.
Fig. 2 is the utility model relates to a mutual-inductor check gauge control system's single chip microcomputer controller circuit diagram.
Fig. 3 is the utility model relates to a mutual-inductor check gauge control system's emulation debugging module circuit diagram.
Fig. 4 is the utility model relates to a mutual-inductor check gauge control system's power module circuit diagram.
Fig. 5 is the utility model relates to a mutual-inductor check gauge control system's clock module circuit diagram.
Fig. 6 is the utility model relates to a mutual-inductor check gauge control system's watchdog module circuit diagram.
Fig. 7 is the utility model relates to a mutual-inductor calibration equipment control system's communication module circuit diagram.
Fig. 8 is the utility model relates to a mutual-inductor check gauge control system's digital display module circuit diagram.
Fig. 9 is an enlarged view of fig. 8 (a).
Fig. 10 is an enlarged view of fig. 8 (b).
Fig. 11 is an enlarged view of fig. 8 (c).
Fig. 12 is the utility model relates to a mutual-inductor check gauge control system's signal acquisition module circuit diagram.
Fig. 13 is the utility model relates to a mutual-inductor check gauge control system's function range switches instruction module circuit diagram.
Fig. 14 is a circuit diagram of a functional range switching module of a control system of a transformer calibrator.
Fig. 15 is the utility model relates to a mutual-inductor check gauge control system's key module circuit diagram.
Detailed Description
The present invention will be further described with reference to the following embodiments and the accompanying fig. 1-15, but the present invention is not limited to these embodiments.
Example 1
A control system of a mutual inductor calibrator is disclosed, as shown in figures 1-15, the control system comprises an information acquisition unit, an information processing unit, a display unit and an operation unit; the information acquisition unit is connected with the information processing unit, the information processing unit is connected with the display unit, and the operation unit is connected with the information processing unit; the information processing unit comprises a single chip microcomputer controller 1, a simulation debugging module 2 and a function range switching module 10, wherein the simulation debugging module 2 is connected with the single chip microcomputer controller 1, and the function range switching module 10 is connected with the single chip microcomputer controller 1.
The control system further comprises a power supply unit, the power supply unit comprises a power supply module 3, and the power supply module 3 is connected with the single-chip microcomputer controller 1. The control system further comprises a protection unit, the protection unit comprises a clock module 4 and a watchdog module 5, the clock module 4 is connected with the single-chip microcomputer controller 1, and the watchdog module is connected with the single-chip microcomputer controller 1. The control system further comprises a communication unit, the communication unit comprises a communication module 6, and the communication module 6 is connected with the single-chip microcomputer controller 1. The display unit comprises a digital display module 7 and a functional range switching indication module 9, the digital display module 7 is connected with the single chip microcomputer controller 1, wherein the digital display module 7 comprises three display screens which are respectively a dial indicator, a ratio difference meter and an angle difference meter; the function range switching indication module 9 is connected with the singlechip controller 1. The information acquisition unit comprises a signal acquisition module 8, and the signal acquisition module 8 is connected with the single chip microcomputer controller 1. The operation unit comprises a key module 11, and the key module 11 is connected with the singlechip microcomputer controller 1. The single chip microcomputer controller 1 can store a test state, memorizes the last test state after power failure and restart, and avoids unnecessary setting process; the single chip microcomputer controller 1 automatically judges whether the wiring state is normal or not through front-end signal and data prompt, and gives corresponding prompt.
The circuit of the signal acquisition module 8 comprises 3A/D converters, a reference voltage source, schmidt trigger inverters 74HC14, resistors and capacitors, wherein the number of the A/D converters is 3, the 3A/D converters correspond to a dial indicator, a ratio difference meter and an angle difference meter of the digital display module 7 respectively, and each A/D converter is connected with the Schmidt trigger inverter 74HC14, the resistors and the capacitors; the A/D converter reference corresponding to the dial indicator is provided by a reference voltage source. The A/D converter is a CMOS single-chip 4-bit half A/D converter ICL7135. The A/D converter comprises an analog circuit and a digital circuit; wherein; the analog circuit comprises a buffer, an integrator, a comparator, a zero-crossing detector, a polarity trigger and 4 groups of analog switches, wherein each A/D conversion period of the A/D converter is divided into 4 stages of automatic zero setting, forward integration, reverse integration and zero integration; the digital circuit comprises a 4-bit half counter, a latch, a bit gating and BCD code multi-path scanning circuit, a polarity trigger, a zero-crossing trigger and control logic.
In addition, the function range switching indication module 10 includes a plurality of photocouplers, the circuit of the function range switching indication module 9 includes 2 74HC164 chips, and a resistor and a light emitting diode are connected in series on a plurality of terminal branches of each 74HC164 chip.
The key module 11 of the system of the embodiment includes a function key, a range key and an accuracy key:
the function key has four functions of selecting CT, PT, Z and Y and is used for switching the instrument into four measurement states of current transformer error, voltage transformer error, current transformer load and voltage transformer load.
The range key is used for selecting the ranges of 5A, 2A and 1A according to the secondary rated working current of the tested mutual inductor when measuring the CT and the current load box; when the PT and the voltage load box are measured, 100V is selected according to the secondary rated working voltage of the mutual inductor to be measured,
100/3V range.
The precision key can be selected according to the accuracy of the tested transformer, and the impedance or the admittance to be tested is selected to be 0.6 omega, 6 omega, 60 omega or 0.3ms, 3ms and 30ms.
% represents a dial indicator;
f (%) is a ratio difference table, R table (. OMEGA.), g table (ms);
delta (min) represents an angle difference table, an x table (omega) and a b table (ms);
T 0 indicating the line ground
A housing ground.
The transformer calibrator controlled by the control system of the embodiment is an SZCP-2 type transformer calibrator.
Rated working currents of the mutual inductor calibrator are 5A, 2A and 1A. Rated working voltage is 100V,
100/3V。
When the transformer calibrator control system of the embodiment calibrates the transformer, the allowable variation range of the rated working current (In) and the rated working voltage (Un) and the error measurement range are as follows: 1 to 200 percent.
When the transformer calibrator control system of this embodiment measures impedance, admittance, rated operating current, operating voltage allow the variation range and impedance, admittance measuring range: impedance is 1-120%:
admittance 1-120%:
the instrument transformer calibrator control system of the embodiment controls the indicating value errors of the in-phase component and the quadrature component of the instrument:
Δ＝±(1.5％X+0.05％FS)；
wherein: x represents a reading; FS represents the full scale reading; Δ represents the indicating error.
The error of the dial indicator does not exceed 1.5% FS. Where FS is the fullness value.
The self protection function of the instrument control system is more perfect and reliable. The setting operation can only be switched when the dial indicator is less than 15%, otherwise the instrument does not respond.
The numerical value of the instrument can be directly read, the resolution is optimized, the reading is more visual and convenient, and the multiplying power of 3 percent and 1 percent is multiplied by 10;0.5 percent, 0.2 percent and 0.1 percent of three-grade multiplying power is multiplied by 1;0.05%,0.02%,0.01%,0.005% fourth magnification is × 0.1.
The instrument control system has a memory function and can memorize the last test state. Such as function, range and level of accuracy. The operation is simplified.
The instrument control system communicates with the microcomputer and manages data obtained from the calibrator. The operating software was purchased separately.
The in-phase and quadrature components of the instrument control system have a phase error of 0.02rad.
The load introduced by the instrument control system to the standard current transformer and the standard voltage transformer is close to 0VA.
Through the use, the instrument control system can ensure that the linearity is not more than 1.5% within the range of 190% -0.2% when measuring the S-level current transformer.
Claims (8)
1. A control system of a mutual inductor calibrator is characterized by comprising an information acquisition unit, an information processing unit, a display unit and an operation unit; the information acquisition unit is connected with the information processing unit, the information processing unit is connected with the display unit, and the operation unit is connected with the information processing unit;
the information processing unit comprises a single chip microcomputer controller (1), a simulation debugging module (2) and a function range switching module (10), wherein the simulation debugging module (2) is connected with the single chip microcomputer controller (1), and the function range switching module (10) is connected with the single chip microcomputer controller (1);
the display unit comprises a digital display module (7) and a functional range switching indication module (9), the digital display module (7) is connected with the single chip microcomputer controller (1), and the digital display module (7) comprises three display screens which are respectively a dial indicator, a ratio difference meter and an angle difference meter; the functional range switching indication module (9) is connected with the single chip microcomputer controller (1);
the information acquisition unit comprises a signal acquisition module (8), and the signal acquisition module (8) is connected with the single-chip microcomputer controller (1);
the circuit of the signal acquisition module (8) comprises an A/D converter, a reference voltage source, a Schmidt trigger phase inverter 74HC14, a resistor and a capacitor, the number of the A/D converters is 3, the 3A/D converters respectively correspond to a dial indicator, a ratio difference meter and an angle difference meter of the digital display module (7), and each A/D converter is connected with the Schmidt trigger phase inverter 74HC14, the resistor and the capacitor; the A/D converter reference corresponding to the dial indicator is provided by a reference voltage source.
2. The transformer calibrator control system according to claim 1, wherein the control system further comprises a power supply unit, the power supply unit comprises a power supply module (3), and the power supply module (3) is connected with the single-chip microcomputer controller (1).
3. The transformer calibrator control system according to claim 1, wherein the control system further comprises a protection unit, the protection unit comprises a clock module (4) and a watchdog module (5), the clock module (4) is connected with the single chip controller (1), and the watchdog module is connected with the single chip controller (1).
4. The transformer calibrator control system according to claim 1, further comprising a communication unit, wherein the communication unit comprises a communication module (6), and the communication module (6) is connected with the single chip microcomputer controller (1).
5. The transformer calibrator control system according to claim 1, wherein the operating unit comprises a key module (11), and the key module (11) is connected with the single-chip microcomputer controller (1);
the key module (11) comprises a function key, a range key and an accuracy key;
the function key has four functions of selecting CT, PT, Z and Y and is used for switching an instrument into four measurement states of current transformer error, voltage transformer error, current transformer load and voltage transformer load;
the range key is used for selecting the ranges of 5A, 2A and 1A according to the secondary rated working current of the tested mutual inductor when measuring the CT and the current load box; when the PT and the voltage load box are measured, 100V is selected according to the secondary rated working voltage of the measured mutual inductor,
100/3V range;
the precision key can be selected according to the accuracy of the tested transformer, and the impedance or the admittance to be tested is selected to be 0.6 omega, 6 omega, 60 omega or 0.3ms, 3ms and 30ms.
6. The transformer calibrator control system of claim 1, wherein the a/D converter is a CMOS monolithic 4-bit half a/D converter ICL7135;
the A/D converter comprises an analog circuit and a digital circuit; wherein; the analog circuit comprises a buffer, an integrator, a comparator, a zero-crossing detector, a polarity trigger and 4 groups of analog switches, wherein each A/D conversion period of the A/D converter is divided into 4 stages of automatic zero setting, forward integration, reverse integration and zero integration; the digital circuit comprises a 4-bit half counter, a latch, a bit gating and BCD code multi-path scanning circuit, a polarity trigger, a zero-crossing trigger and control logic.
7. The transformer calibrator control system according to claim 1, wherein the functional range switching module (10) comprises a plurality of photocouplers, a circuit of the functional range switching indication module (9) comprises 2 74HC164 chips, and a resistor and a light emitting diode are connected in series to a plurality of terminal branches of each 74HC164 chip.
8. The control system of the transformer calibrator according to claim 1, wherein the single-chip microcomputer controller (1) can save a test state, memorize the last test state after power failure and restart, and avoid an unnecessary setting process; the single chip microcomputer controller (1) automatically judges whether the wiring state is normal or not through front-end signals and data prompts, and gives corresponding prompts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221478899.4U CN217902282U (en) | 2022-06-14 | 2022-06-14 | Mutual inductor calibrator control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221478899.4U CN217902282U (en) | 2022-06-14 | 2022-06-14 | Mutual inductor calibrator control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217902282U true CN217902282U (en) | 2022-11-25 |
Family
ID=84129829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221478899.4U Active CN217902282U (en) | 2022-06-14 | 2022-06-14 | Mutual inductor calibrator control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217902282U (en) |
-
2022
- 2022-06-14 CN CN202221478899.4U patent/CN217902282U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103471473B (en) | A kind of portable missile integration test car automatic gauge calibrating installation and calibration method | |
| ES2094747T3 (en) | ELECTRONIC WATT-HOUR METER. | |
| CN101839931A (en) | Alternating current signal measurement device, system and method | |
| CN110780257A (en) | Direct current transformer detection system and detection method based on standard source | |
| CN217902282U (en) | Mutual inductor calibrator control system | |
| CN106707213B (en) | A kind of digital integrated electronic circuit standard sample of photo | |
| CN105445818A (en) | Automatic meteorological station data acquisition device checking system and checking method thereof | |
| CN1005653B (en) | Automatic mutual-inductor calibrating instrument | |
| CN110456210A (en) | 1553B network-bus trouble point checking method, apparatus and system | |
| CN102938646A (en) | Fine-adjustment test system of hybrid integrated circuit and method of test system | |
| CN215526371U (en) | Delay line time difference measuring device based on FPGA | |
| CN212646965U (en) | Single-point calibration circuit structure realized by built-in resistance network of digital multimeter | |
| CN204613383U (en) | Earth resistance tester calibration equipment | |
| CN213023537U (en) | Installation type standard meter with pulse input and output switching function | |
| CN210639245U (en) | Automatic testing arrangement of multi-functional circuit board and system | |
| CN113884963A (en) | High-precision direct-current standard electric energy meter | |
| CN108318751B (en) | Board card for instrument test | |
| CN110907050A (en) | Temperature measuring device | |
| CN113820528A (en) | Wide voltage range automatic gear shifting circuit for passive secondary loop checking meter | |
| CN218446422U (en) | Control system of miniature current transformer calibrator | |
| CN221281131U (en) | Voltage measurement control circuit | |
| Gookin | A fast reading high resolution voltmeter that calibrates itself automatically | |
| CN213517279U (en) | Semi-automatic multifunctional multimeter | |
| CN216285478U (en) | Single-phase electric energy meter circuit | |
| CN216082903U (en) | True effective value alternating-current millivolt measuring voltmeter for teaching experiment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |