CN112650639A - Trimming system capable of achieving automatic trimming of sensor - Google Patents
Trimming system capable of achieving automatic trimming of sensor Download PDFInfo
- Publication number
- CN112650639A CN112650639A CN202011502537.XA CN202011502537A CN112650639A CN 112650639 A CN112650639 A CN 112650639A CN 202011502537 A CN202011502537 A CN 202011502537A CN 112650639 A CN112650639 A CN 112650639A
- Authority
- CN
- China
- Prior art keywords
- trimming
- sensor
- module
- upper computer
- main control
- 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.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
- G06F11/26—Functional testing
- G06F11/273—Tester hardware, i.e. output processing circuits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
Abstract
The invention relates to a trimming system capable of realizing automatic trimming of a sensor, which comprises an upper computer and a communication control panel communicated with the upper computer; the upper computer is used for configuring parameters, sending a trimming command to the communication control panel, performing read-write operation on the communication control panel, calculating, recording and storing feedback data, and realizing closed-loop operation of a trimming system; and the communication control panel is used for operating the sensor according to the trimming command and acquiring feedback data of the sensor to the upper computer. The invention adopts the design idea of modular circuits on the board, and reduces the use amount of other auxiliary equipment. The invention realizes one-key operation, does not need human participation during trimming, and reduces the error probability.
Description
Technical Field
The invention belongs to the field of sensor trimming application, and particularly relates to a trimming system capable of realizing automatic trimming of a sensor.
Background
With the increasing demands of the market on the performance of integrated circuits, the integrated circuits themselves face more and more serious examinations, and especially for the analog parts of analog integrated circuits and hybrid integrated circuits, the offset and temperature drift of the reference source often cause the function of the whole circuit to fail. For sensor circuits, once the chip is taped out, the relevant characteristics of the circuit are determined and cannot be altered. However, due to the influence of non-ideal factors such as process environment, some parameters do not meet the design expectations, resulting in the accuracy and performance of the chip after tape-out being far from expectations. In order to make up for the gap between the circuit design expectation and the final performance of the chip, trimming techniques for large-scale integrated circuits have been developed in recent years. Meanwhile, the sensor is developing towards the direction of collecting more parameters, high precision and the like, so that how to quickly finish the trimming work and ensure that the trimmed sensor meets the performance requirement is very important.
According to the traditional trimming work, after a sensor is placed in a constant temperature environment and is stable, a signal source is needed to output a standard signal to the sensor, equipment such as a universal meter is sometimes used for monitoring, the operation process during trimming needs to be manually participated, data needs to be manually recorded and stored, and the whole trimming process is long in time, complex and prone to errors.
Disclosure of Invention
The invention aims to provide a trimming system capable of realizing automatic trimming of a sensor, which can simply and conveniently finish the trimming work of the sensor and well solve the defects of the traditional trimming work.
The technical scheme adopted by the invention for realizing the purpose is as follows:
the trimming system mainly comprises a trimming circuit board, a communication control panel and an upper computer, one-key trimming can be realized without other operations, the upper computer automatically records and stores trimming data, and a sensor after trimming meets the design requirement.
A trimming system capable of realizing automatic trimming of a sensor comprises an upper computer and a communication control panel communicated with the upper computer;
the upper computer is used for configuring parameters, sending a trimming command to the communication control panel, performing read-write operation on the communication control panel, calculating, recording and storing feedback data, and realizing closed-loop operation of a trimming system;
and the communication control panel is used for operating the sensor according to the trimming command and acquiring feedback data of the sensor to the upper computer.
The communication control panel includes:
the main control module is used for receiving and analyzing a trimming command from the upper computer, and then operating the ADC module, the DAC module and the power supply module 2 according to the command requirement or operating a sensor to be trimmed through the isolation module;
the isolation module is used for converting the control command of the main control module into power supply voltages with different specifications to the sensor;
the ADC module is used for converting the acquired sensor analog voltage quantity into a digital signal quantity and sending the digital signal quantity to the main control module;
the DAC module is used for converting the control command of the main control module into an analog voltage quantity to the sensor;
the power supply module 1 is used for supplying power to the side A of the main control module, the ADC module, the DAC module and the isolation module;
the power supply module 2 is used for supplying power to the side B of the isolation module, namely supplying power to the sensor to be repaired; the power supply module 2 is controlled by the master control module and outputs two power supply voltages with different specifications to the side B of the isolation module so as to realize trimming fuses of the sensor.
The communication control panel also comprises a reserved module which is used for changing according to the change of the sensor trimming parameters; the reservation module is one of a laser module and an angle module.
A trimming method capable of realizing automatic trimming of a sensor is used for trimming reference voltage of the sensor and comprises the following steps:
1) the upper computer sends a reference voltage reading command to the communication control panel through the communication interface; the main control module of the communication control board analyzes the command, and then the sensor to be modified is operated to output reference voltage through the isolation module and the serial interface; the reference voltage of the sensor is output to an ADC module of the communication control panel through an interface 1; the master control module operates the ADC module to read the reference voltage and then forms a protocol packet, and the protocol packet is fed back to the upper computer through the communication interface;
2) the upper computer analyzes the command and calculates the difference value between the read value and the set standard value; judging whether the difference value is within the error range; if the difference value is within the error range, the main control module operates the power supply module 2 to output the specification voltage required by the fuse, executes the fuse operation and finishes the reference voltage trimming work; if the difference is not within the error range, the upper computer calculates the trimming code according to the difference and sends a command for writing the trimming code to the communication control panel through the communication interface; the main control module of the communication control board analyzes the command, and the sensor to be repaired is operated to write in the repairing code through the isolation module and the serial interface; then reading the reference voltage written with the trimming code;
3) returning to the step 1), until the difference value is within the error range, the main control module operates the power supply module 2 to output the standard voltage required by the fuse, executes the fuse operation, and finishes the reference voltage trimming work.
The method for trimming the voltage channel of the sensor comprises the following steps:
1) the upper computer sends a voltage channel trimming command to the communication control panel; the master control module operates the DAC module to output a standard voltage value and outputs the standard voltage value to a voltage channel of the sensor through the interface 2; then the main control module operates the sensor to read the voltage value of the voltage channel through the serial interface; the main control module feeds the read voltage value back to the upper computer;
2) the upper computer calculates the difference value between the read value and the standard value; judging whether the difference value is within the error range; if the difference value is within the error range, the main control module operates the power supply module 2 to output the specification voltage required by the fuse, executes the fuse operation and finishes the voltage channel trimming work; if the difference is not within the error range, the upper computer calculates the trimming code according to the difference and sends a command for writing the trimming code to the communication control panel; the main control module operates the sensor to be trimmed and writes in the trimming code through the serial interface; then operating the sensor to be modified to read the voltage value of the voltage channel written with the modification code;
3) returning to the step 1), until the difference value is within the error range, the main control module operates the power supply module 2 to output the specification voltage required by the fuse, executes the fuse operation, and finishes the voltage channel trimming work.
The method for trimming the temperature channel of the sensor comprises the following steps:
1) the upper computer sends a temperature channel trimming command to the communication control panel; the main control module operates the sensor to read the temperature value of the temperature channel through the serial interface; the main control module feeds back the read temperature value to the upper computer;
2) the upper computer calculates the difference value between the read value and the standard value; judging whether the difference value is within the error range; if the difference value is within the error range, the main control module operates the power supply module 2 to output the specification voltage required by the fuse, executes the fuse operation and finishes the temperature channel trimming work; if the difference is not within the error range, the upper computer calculates the trimming code according to the difference condition and sends a command for writing the trimming code to the communication control panel; the main control module operates the sensor to be trimmed and writes in the trimming code through the serial interface; then operating the sensor to be repaired to read the temperature value of the temperature channel written with the repair code;
3) returning to the step 1), until the difference value is within the error range, the main control module operates the power supply module 2 to output the specification voltage required by the fuse, executes the fuse operation, and finishes the temperature channel trimming work.
The invention has the following beneficial effects and advantages:
1. the invention adopts the design idea of modular circuits on the board, and reduces the use amount of other auxiliary equipment.
2. The invention realizes one-key operation, does not need human participation during trimming, and reduces the error probability.
Drawings
FIG. 1 is a block diagram of a sensor trimming system of the present invention;
FIG. 2 is a flow chart of a sensor reference voltage trimming of the present invention;
FIG. 3 is a flow chart of a sensor voltage channel trimming of the present invention;
FIG. 4 is a flow chart of a sensor temperature channel trimming process of the present invention.
Detailed Description
Fig. 1 is a block diagram of a sensor trimming system. The trimming system mainly comprises a trimming circuit board, a communication control board and an upper computer.
The trimming circuit board mainly comprises a sensor to be trimmed, a peripheral circuit and an interface of the sensor, and the whole circuit board is placed in a constant temperature environment, such as a constant temperature box or an oil tank, shown by a dotted line frame in fig. 1, so that a stable working environment is provided for the sensor, and subsequent trimming work is facilitated. The interface 1 is that the sensor outputs reference voltage to the communication control panel, the interface 2 is that the sensor receives the voltage signal from the communication control panel, the interface 3 is that the sensor receives the reservation signal from the communication control panel, the serial interface is that the sensor receives the control signal from the communication control panel and feeds back data to the communication control panel.
The communication control panel mainly comprises a main control module, a DAC module, an ADC module, a reservation module, a power module, an isolation module and an interface, wherein the main control module receives a communication command from an upper computer through the communication interface, analyzes the command of the upper computer, and then operates the ADC module, the DAC module, the reservation module and the power module 2 according to the command requirement or operates a sensor to be repaired through the isolation module. The DAC module plays a role of a signal source, the ADC module plays a role of a multimeter, the reserved module can be changed according to the change of the trimming parameters of the sensor, and the use number of auxiliary equipment is effectively reduced through the modular circuit design of the communication control board. The external power supply interface supplies power to the communication control panel, the power module 1 supplies power to the main control module, the ADC module, the DAC module and the isolation module A side, the power module 2 supplies power to the isolation module B side, namely, the sensor to be repaired is supplied with power, the power module 2 is controlled by the main control module, two kinds of power supply voltages with different specifications can be output to the isolation module B side, and the sensor repairing fuse is convenient.
The upper computer can realize parameter configuration, reading and writing operations of the trimming system, calculation, recording and storage of feedback data, realize closed-loop operation of the trimming system and finally complete one-key trimming work.
Fig. 2 is a flow chart of sensor reference voltage trimming. Taking the reference voltage trimming process as an example, the working process of the trimming system is described in detail. The upper computer executes the reference voltage to start trimming; the upper computer sends a reference voltage reading command to the communication control panel through the communication interface; the main control module of the communication control board analyzes the command, and then the sensor to be modified is operated to output reference voltage through the isolation module and the serial interface; the reference voltage of the sensor is output to an ADC module of the communication control panel through an interface 1; the master control module operates the ADC module to read the reference voltage and then forms a protocol packet, and the protocol packet is fed back to the upper computer through the communication interface; the upper computer analyzes the command and calculates the difference value between the read value and the standard value; judging whether the difference value is within the error range; if the difference value is within the error range, the main control module operates the power supply module 2 to output the specification voltage required by the fuse, executes the fuse operation and finishes the reference voltage trimming work; if the difference is not within the error range, the upper computer calculates the trimming code according to the difference condition and sends a command for writing the trimming code to the communication control panel through the communication interface; the main control module of the communication control board analyzes the command, and the sensor to be repaired is operated to write in the repairing code through the isolation module and the serial interface; and then reading the reference voltage written with the trimming code, circularly executing the steps until the difference value is within the error range, finally operating the power supply module 2 by the main control module to output the specification voltage required by the fuse, executing the fuse operation, and finishing the trimming work of the reference voltage. The data in the trimming process can be automatically recorded and stored for the user to store, analyze and use. The trimming work realizes one-key operation to finish closed-loop trimming. The principle of trimming other parameters of the sensor is similar, and is briefly described below with reference to fig. 3 and 4.
Fig. 3 shows a flow chart of sensor voltage channel trimming. The upper computer executes the voltage channel to start trimming; the upper computer sends a voltage channel trimming command to the communication control panel; the master control module operates the DAC module to output a standard voltage value and outputs the standard voltage value to a voltage channel of the sensor through the interface 2; then the main control module operates the sensor to read the voltage value of the voltage channel through the serial interface; the main control module feeds the read voltage value back to the upper computer; the upper computer calculates the difference value between the read value and the standard value; judging whether the difference value is within the error range; if the difference value is within the error range, the main control module operates the power supply module 2 to output the specification voltage required by the fuse, executes the fuse operation and finishes the voltage channel trimming work; if the difference is not within the error range, the upper computer calculates the trimming code according to the difference condition and sends a command for writing the trimming code to the communication control panel; the main control module operates the sensor to be trimmed and writes in the trimming code through the serial interface; and then operating the sensor to be trimmed to read the voltage value of the voltage channel written with the trimming code, circularly executing the steps until the difference value is within the error range, finally operating the power supply module 2 by the main control module to output the voltage with the specification required by the fuse, executing the fuse operation, and finishing the trimming work of the voltage channel.
Fig. 4 shows a flow chart for trimming the temperature channel of the sensor. The upper computer executes the temperature channel to start trimming; the upper computer sends a temperature channel trimming command to the communication control panel; the main control module operates the sensor to read the temperature value of the temperature channel through the serial interface; the main control module feeds back the read temperature value to the upper computer; the upper computer calculates the difference value between the read value and the standard value; judging whether the difference value is within the error range; if the difference value is within the error range, the main control module operates the power supply module 2 to output the specification voltage required by the fuse, executes the fuse operation and finishes the temperature channel trimming work; if the difference is not within the error range, the upper computer calculates the trimming code according to the difference condition and sends a command for writing the trimming code to the communication control panel; the main control module operates the sensor to be trimmed and writes in the trimming code through the serial interface; and then operating the sensor to be repaired to read the temperature value of the temperature channel written with the repair code, circularly executing the steps until the difference value is within the error range, finally operating the power supply module 2 by the main control module to output the specification voltage required by the fuse, executing the fuse operation, and finishing the repair work of the temperature channel.
Claims (6)
1. A trimming system capable of realizing automatic trimming of a sensor is characterized by comprising an upper computer and a communication control panel communicated with the upper computer;
the upper computer is used for configuring parameters, sending a trimming command to the communication control panel, performing read-write operation on the communication control panel, calculating, recording and storing feedback data, and realizing closed-loop operation of a trimming system;
and the communication control panel is used for operating the sensor according to the trimming command and acquiring feedback data of the sensor to the upper computer.
2. The trimming system for automatically trimming the sensor according to claim 1, wherein the communication control board comprises:
the main control module is used for receiving and analyzing a trimming command from the upper computer, and then operating the ADC module, the DAC module and the power supply module 2 according to the command requirement or operating a sensor to be trimmed through the isolation module;
the isolation module is used for converting the control command of the main control module into power supply voltages with different specifications to the sensor;
the ADC module is used for converting the acquired sensor analog voltage quantity into a digital signal quantity and sending the digital signal quantity to the main control module;
the DAC module is used for converting the control command of the main control module into an analog voltage quantity to the sensor;
the power supply module 1 is used for supplying power to the side A of the main control module, the ADC module, the DAC module and the isolation module;
the power supply module 2 is used for supplying power to the side B of the isolation module, namely supplying power to the sensor to be repaired; the power supply module 2 is controlled by the master control module and outputs two power supply voltages with different specifications to the side B of the isolation module so as to realize trimming fuses of the sensor.
3. The trimming system capable of realizing automatic trimming of the sensor according to claim 1, wherein the communication control board further comprises a reserved module for changing according to the change of the trimming parameters of the sensor; the reservation module is one of a laser module and an angle module.
4. A trimming method capable of realizing automatic trimming of a sensor is characterized by trimming a reference voltage of the sensor, and comprises the following steps:
1) the upper computer sends a reference voltage reading command to the communication control panel through the communication interface; the main control module of the communication control board analyzes the command, and then the sensor to be modified is operated to output reference voltage through the isolation module and the serial interface; the reference voltage of the sensor is output to an ADC module of the communication control panel through an interface 1; the master control module operates the ADC module to read the reference voltage and then forms a protocol packet, and the protocol packet is fed back to the upper computer through the communication interface;
2) the upper computer analyzes the command and calculates the difference value between the read value and the set standard value; judging whether the difference value is within the error range; if the difference value is within the error range, the main control module operates the power supply module 2 to output the specification voltage required by the fuse, executes the fuse operation and finishes the reference voltage trimming work; if the difference is not within the error range, the upper computer calculates the trimming code according to the difference and sends a command for writing the trimming code to the communication control panel through the communication interface; the main control module of the communication control board analyzes the command, and the sensor to be repaired is operated to write in the repairing code through the isolation module and the serial interface; then reading the reference voltage written with the trimming code;
3) returning to the step 1), until the difference value is within the error range, the main control module operates the power supply module 2 to output the standard voltage required by the fuse, executes the fuse operation, and finishes the reference voltage trimming work.
5. The trimming method for automatically trimming the sensor according to claim 4, wherein the trimming of the sensor voltage channel comprises the following steps:
1) the upper computer sends a voltage channel trimming command to the communication control panel; the master control module operates the DAC module to output a standard voltage value and outputs the standard voltage value to a voltage channel of the sensor through the interface 2; then the main control module operates the sensor to read the voltage value of the voltage channel through the serial interface; the main control module feeds the read voltage value back to the upper computer;
2) the upper computer calculates the difference value between the read value and the standard value; judging whether the difference value is within the error range; if the difference value is within the error range, the main control module operates the power supply module 2 to output the specification voltage required by the fuse, executes the fuse operation and finishes the voltage channel trimming work; if the difference is not within the error range, the upper computer calculates the trimming code according to the difference and sends a command for writing the trimming code to the communication control panel; the main control module operates the sensor to be trimmed and writes in the trimming code through the serial interface; then operating the sensor to be modified to read the voltage value of the voltage channel written with the modification code;
3) returning to the step 1), until the difference value is within the error range, the main control module operates the power supply module 2 to output the specification voltage required by the fuse, executes the fuse operation, and finishes the voltage channel trimming work.
6. The trimming method for automatically trimming the sensor according to claim 4, wherein the trimming of the temperature channel of the sensor comprises the following steps:
1) the upper computer sends a temperature channel trimming command to the communication control panel; the main control module operates the sensor to read the temperature value of the temperature channel through the serial interface; the main control module feeds back the read temperature value to the upper computer;
2) the upper computer calculates the difference value between the read value and the standard value; judging whether the difference value is within the error range; if the difference value is within the error range, the main control module operates the power supply module 2 to output the specification voltage required by the fuse, executes the fuse operation and finishes the temperature channel trimming work; if the difference is not within the error range, the upper computer calculates the trimming code according to the difference condition and sends a command for writing the trimming code to the communication control panel; the main control module operates the sensor to be trimmed and writes in the trimming code through the serial interface; then operating the sensor to be repaired to read the temperature value of the temperature channel written with the repair code;
3) returning to the step 1), until the difference value is within the error range, the main control module operates the power supply module 2 to output the specification voltage required by the fuse, executes the fuse operation, and finishes the temperature channel trimming work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011502537.XA CN112650639A (en) | 2020-12-18 | 2020-12-18 | Trimming system capable of achieving automatic trimming of sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011502537.XA CN112650639A (en) | 2020-12-18 | 2020-12-18 | Trimming system capable of achieving automatic trimming of sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112650639A true CN112650639A (en) | 2021-04-13 |
Family
ID=75354873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011502537.XA Pending CN112650639A (en) | 2020-12-18 | 2020-12-18 | Trimming system capable of achieving automatic trimming of sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112650639A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114372432A (en) * | 2021-12-17 | 2022-04-19 | 贵州振华风光半导体股份有限公司 | Digital fuse trimming system and method based on SPI serial interface |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105739589A (en) * | 2016-05-11 | 2016-07-06 | 成都信息工程大学 | Temperature coefficient automatic tuning method for reference circuit |
| CN108155908A (en) * | 2017-12-18 | 2018-06-12 | 中国电子科技集团公司第四十七研究所 | A kind of fuse of digital analog converter trims test method |
| CN109781179A (en) * | 2019-01-25 | 2019-05-21 | 云南保利天同仪器有限公司 | Multi-channel multi-parameter sensor detecting system and its detection method |
| CN111158280A (en) * | 2019-12-26 | 2020-05-15 | 北京时代民芯科技有限公司 | High-precision analog-to-digital converter fuse automatic burning system and method |
| CN111381623A (en) * | 2018-12-29 | 2020-07-07 | 无锡华润矽科微电子有限公司 | System for reference voltage trimming and corresponding reference voltage trimming method |
| CN111475364A (en) * | 2020-05-27 | 2020-07-31 | 中电海康无锡科技有限公司 | Method and system for testing system-on-chip |
-
2020
- 2020-12-18 CN CN202011502537.XA patent/CN112650639A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105739589A (en) * | 2016-05-11 | 2016-07-06 | 成都信息工程大学 | Temperature coefficient automatic tuning method for reference circuit |
| CN108155908A (en) * | 2017-12-18 | 2018-06-12 | 中国电子科技集团公司第四十七研究所 | A kind of fuse of digital analog converter trims test method |
| CN111381623A (en) * | 2018-12-29 | 2020-07-07 | 无锡华润矽科微电子有限公司 | System for reference voltage trimming and corresponding reference voltage trimming method |
| CN109781179A (en) * | 2019-01-25 | 2019-05-21 | 云南保利天同仪器有限公司 | Multi-channel multi-parameter sensor detecting system and its detection method |
| CN111158280A (en) * | 2019-12-26 | 2020-05-15 | 北京时代民芯科技有限公司 | High-precision analog-to-digital converter fuse automatic burning system and method |
| CN111475364A (en) * | 2020-05-27 | 2020-07-31 | 中电海康无锡科技有限公司 | Method and system for testing system-on-chip |
Non-Patent Citations (1)
| Title |
|---|
| 姚思雨等: ""一种具有预修调功能的数字修调系统"", 《电子技术与软件工程》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114372432A (en) * | 2021-12-17 | 2022-04-19 | 贵州振华风光半导体股份有限公司 | Digital fuse trimming system and method based on SPI serial interface |
| CN114372432B (en) * | 2021-12-17 | 2023-01-13 | 贵州振华风光半导体股份有限公司 | Digital fuse trimming system and method based on SPI serial interface |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202025338U (en) | Data acquisition card calibration device | |
| CN105242218A (en) | DC source full-coverage automatic test system | |
| CN112034413B (en) | Multi-core modular electric energy meter detection system | |
| CN112650639A (en) | Trimming system capable of achieving automatic trimming of sensor | |
| CN105739589A (en) | Temperature coefficient automatic tuning method for reference circuit | |
| EP1978527B1 (en) | Tester | |
| CN103455078B (en) | A kind of current-limiting circuit, device | |
| CN106299990B (en) | One kind being used for fiber amplifier non-linear laser device control method and device | |
| CN108828451B (en) | Method for overhauling battery backup unit | |
| CN105759891B (en) | A kind of calibration method for a reference source | |
| CN102288298B (en) | Detector simulator device | |
| CN116248122A (en) | Automatic digital-to-analog converter trimming system and trimming method based on virtual instrument | |
| CN216526154U (en) | Test system of fastener | |
| CN111077454A (en) | Multichannel charging and discharging power supply equipment correction system and method | |
| CN103064883B (en) | The data auto-generation method of railway signal maintenance system | |
| CN103246304B (en) | A kind of sheet internal reference voltage generative circuit, generation chip and the method for generation | |
| CN209821110U (en) | Thermal resistance testing device | |
| CN109001662B (en) | Device and method for automatically recovering calibration data of electronic calibration piece | |
| CN109817270B (en) | Test method of embedded OTP 8-bit MCU chip | |
| CN110838871A (en) | Optical wave test module automatic calibration method based on optical fiber network | |
| CN219037896U (en) | Error compensation control system of image measuring instrument | |
| CN117129924A (en) | Calibration circuit, calibration device, test system and calibration method | |
| CN217982843U (en) | System for accurate injection voltage is undulant in EMMC pressure test | |
| CN115098570B (en) | Method and device for automatically writing route data into flight management system | |
| CN220700713U (en) | Consumable chip, consumable and communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |