CN115328006B - Signal control circuit - Google Patents
Signal control circuit Download PDFInfo
- Publication number
- CN115328006B CN115328006B CN202211250277.0A CN202211250277A CN115328006B CN 115328006 B CN115328006 B CN 115328006B CN 202211250277 A CN202211250277 A CN 202211250277A CN 115328006 B CN115328006 B CN 115328006B
- Authority
- CN
- China
- Prior art keywords
- signal
- switch matrix
- circuit
- matrix
- switch
- 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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Electronic Switches (AREA)
Abstract
The embodiment of the application discloses signal control circuit relates to signal processing technology field, signal control circuit includes: the signal source module is configured to provide signal sources required by the switch matrix circuit, and the signal sources comprise direct current signals and/or alternating current signals; the switch matrix circuit is connected to the signal source module and comprises a first transmission link for transmitting a direct current signal and a second transmission link for transmitting an alternating current signal; the controller is configured to switch gate the switch matrix circuit to direct a signal source to a corresponding transmission link. According to the method and the device, direct current and alternating current control can be realized as required, and different paths are taken by different signal types during testing, so that alternating current and direct current signals are not interfered with each other, the signals are not distorted, and large-scale signal loop diagnosis can be carried out.
Description
Technical Field
The present application relates to the field of signal processing technologies, and more particularly, to a signal control circuit.
Background
The field of signal control and the field of semiconductor applications require large-scale switch matrices to achieve control of signal flow and precision measurement.
Analog switch, mechanical relay or opto-coupler realization signal's switching is commonly used in industry at present, mainly is to single type's signal, directly opens and closes the switch matrix through control circuit to realize essential signal flow control, but hardly guarantee the measurement accuracy and the reliability of signal. Based on the working principle of a single device, the method is limited to be used in the fields of quick switching of complex logic circuits and precision measurement, and signals can be complex signal sources of direct current and alternating current and have requirements on the measurement precision of the signals, such as the field of semiconductor testing, source meter equipment and the like. The application range of the existing switch matrix is narrow, and the application scenario is limited by the limitation of the switch device and can only be applied in one scenario, such as direct current application or alternating current application.
Disclosure of Invention
Therefore, the application provides a signal control circuit, can realize direct current, alternating current control as required, and alternating current-direct current signal noninterference has guaranteed that the signal is undistorted.
In order to achieve at least one of the above purposes, the following technical scheme is adopted in the application:
the application provides a signal control circuit, includes:
a signal source module, a switch matrix circuit, and a controller, wherein,
the signal source module is configured to provide signal sources required by the switch matrix circuit, and the signal sources comprise direct current signals and/or alternating current signals;
the switch matrix circuit is connected to the signal source module and comprises a first transmission link for transmitting a direct current signal and a second transmission link for transmitting an alternating current signal;
the controller is configured to switch gate the switch matrix circuit to direct a signal source to a corresponding transmission link.
In a specific embodiment, the first transmission link comprises a first switch matrix for gating signals to a dummy load loop and/or a third party application scenario;
the second transmission link includes a second switching matrix for gating signals to a third party application scenario and/or a self-test circuit and/or a loopback circuit.
In one embodiment, the dummy load circuit comprises: the device comprises a dummy load matrix, a third switch matrix used for gating the dummy load matrix and a universal meter externally connected to two sides of the dummy load matrix.
In a specific embodiment, the dummy load matrix is a resistor matrix, and the resistors in the resistor matrix have different resistance values to adapt to different direct current signals.
In a specific embodiment, the first switch matrix and the third switch matrix adopt an optical coupling switch matrix or a mechanical relay switch matrix, and the second switch matrix adopts an analog switch matrix.
In a specific embodiment, the second transmission link comprises a fourth switch matrix for isolating the direct current signal for the second transmission link.
In a specific embodiment, an isolation switch is disposed inside the signal source module to isolate the ac signal for the first transmission link.
In a specific embodiment, the controller implements logic control of the switch matrix circuit through an input/output expansion chip.
In one embodiment, the signal source module, the controller, the input/output expansion chip, and the switch matrix circuit communicate via an integrated circuit bus.
The beneficial effects of this application are as follows:
the signal control circuit can realize direct current and alternating current control according to needs, and alternating current signals and direct current signals are not interfered with each other, so that distortion of the signals is avoided, the cost of a source meter can be saved, and the impedance matching consistency is easy to control.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of a signal control circuit in an embodiment of the present application.
Fig. 2 shows a dc signal branch optical coupling switch matrix connection circuit diagram of a signal control circuit in an embodiment of the present application.
Fig. 3 illustrates a mechanical relay switch matrix diagram of a signal control circuit in one embodiment of the present application.
FIG. 4 shows a dummy load matrix circuit diagram of a signal control circuit in one embodiment of the present application.
Fig. 5 is a circuit diagram of a protection circuit switch matrix and a high-speed analog switch matrix of a signal control circuit in an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is further noted that, in the description of the present application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
To solve the problems in the prior art, an embodiment of the present application provides a signal control circuit, as shown in fig. 1, including:
a signal source module 12, a switch matrix circuit and a controller 11, wherein,
the signal source module 12 is configured to provide signal sources required by the switch matrix circuit, the signal sources including direct current signals and/or alternating current signals;
the switch matrix circuit is connected to the signal source module 12 and includes a first transmission link for transmitting a dc signal and a second transmission link for transmitting an ac signal;
the controller 11 is configured to switch gate the switch matrix circuit to direct the signal source to the corresponding transmission link.
In the embodiment, the controller 11, the signal source module 12 and the switch matrix circuit are arranged, so that direct current control and alternating current control are switched as required, and the direct current signal and the alternating current signal correspond to different transmission links, which are not interfered with each other, so that the signals are not distorted.
In a specific embodiment, the first transmission link comprises a first switch matrix 131, and the first switch matrix 131 is used for gating signals to the dummy load loop 14 and/or the third party application scenario 15.
The second transmission link includes a second switching matrix 132, the second switching matrix 132 for gating signals to the third party application scenario 15 and/or the self-test circuit 16 and/or the loopback circuit 17.
In one possible implementation, the dummy load circuit 14 includes a dummy load matrix 141, a third switch matrix 142 for gating the dummy load matrix, and a multimeter 143 external to both sides of the dummy load matrix, wherein,
the dummy load matrix 141 is a resistor matrix, as shown in fig. 4, which is a schematic structural diagram of the resistor matrix, and the resistors in the resistor matrix have different resistance values to be suitable for different dc signals, wherein,
the resistor is a low-temperature drift precision resistor.
The present embodiment realizes measurement and calibration of a signal source by providing the dummy load loop 14, so that the circuit can adapt to various application scenarios, such as measurement, calibration, use as a reference source, and the like.
In a possible implementation manner, the first switch matrix 131 and the third switch matrix 142 employ an optical coupling switch matrix or a mechanical relay switch matrix, and the second switch matrix 132 employs an analog switch matrix.
In a specific embodiment, the application scenario is to connect the optical coupler switch matrix, that is, the first switch matrix 131 and the third switch matrix 142 are the optical coupler switch matrix, a circuit diagram of the optical coupler switch matrix is shown in fig. 2, and the control of the application scenario is realized through the optical coupler switch matrix.
In a specific embodiment, the application scenario is a mechanical relay switch matrix, that is, the first switch matrix 131 and the third switch matrix 142 are mechanical relay switch matrices, and a circuit diagram of the mechanical relay switch matrices is shown in fig. 3, and the control of the application scenario is implemented by the mechanical relay switch matrices.
In another embodiment, on the first transmission link, the dummy load circuit 14 is turned on when the application scenario is a current value of the measurement signal, and the dummy load circuit 14 is turned off when the voltage value of the measurement signal.
In one possible implementation, the second transmission link comprises a fourth switch matrix 133 to isolate the dc signal for the second transmission link.
The present embodiment ensures signal integrity by providing the fourth switch matrix 133 to ensure that the second transmission link only comprises ac signals.
In a specific embodiment, when the dc signal branch is turned on, the ac signal branch is turned off by the fourth switch matrix 133, and only one stage of the ac matrix needs to be turned off, so as to isolate the ac component and improve the measurement accuracy of the dc signal.
In one embodiment, an isolation switch is disposed inside the signal source module 12 to isolate the ac signal for the first transmission link.
In a specific embodiment, the controller 11 implements logic control of the switch matrix circuit through an input/output expansion chip 18, wherein,
the signal source module 12, controller 11, input/output expansion chip 18, and switch matrix circuit communicate via an integrated circuit bus or a serial control bus, wherein,
the input/output expansion chip 18 employs a PCA9506 chip.
In a specific embodiment, the dummy load matrix 141 is connected to a digital multimeter 143 through an external interface, four-wire resistance measurement is realized through a high-precision digital multimeter, namely a source meter, signals are measured and calibrated, and the signals are used as a reference source, and the data precision measured by the digital multimeter is 7 bits after a decimal point, so that the measurement precision is improved. In practical use, the direct current signals are switched to the dummy load loop 14 through the switch matrix, four-wire resistance measurement is realized through a third-party high-precision digital multimeter, and the signal source is measured and calibrated and is used as a reference source.
The embodiment can realize the measurement of direct current and alternating current signals, saves the expense of a source table, and is easy to control the impedance matching consistency. Compared with the embodiment, in the prior art, the multi-channel test and application can be realized only by a plurality of digital source meters, the dummy load resistor is measured by using the source meters in the direct current signal path, and one channel is calibrated in the alternating current signal path, so that the constraint of the source meters can be separated.
In one particular embodiment, as shown in figure 5,
the fourth switch matrix 133 is composed of a first resistance switch matrix and a second resistance switch matrix;
the second switch matrix 132 is comprised of a 32-bit high-speed analog switch matrix.
In a specific embodiment, the first resistance switch matrix is used for protecting the circuit and turning off the alternating current signal branch when the direct current signal branch is turned on;
the second resistive switch matrix is used for protecting a circuit.
The self-test circuit 16 is used for connecting the third party application scenario 15 to perform different required test scenarios.
The third-party application scene 15 comprises a loop test and diagnosis test scene, an application and function development scene and an oscilloscope signal quality test scene, switching of different application scenes is achieved through gating control of the switch matrix, the applicability of different switch matrices to each application scene is different, the circuit structure can be suitable for various different application scenes, and the problem of the singleness of the application scenes of the traditional circuit structure is solved.
The selection of each switch matrix type may be selected according to specific requirements, and the application is not limited in particular.
In a specific embodiment, the controller 11 is connected to a first terminal of the input/output expansion chip 18 through a control bus;
the second terminal of the input/output expansion chip 18 is connected to the first terminal of the first switch matrix 131, and the third terminal is connected to the first terminal of the fourth switch matrix 133;
a first end of the signal source module 12 is connected to a second end of the first switch matrix 131;
a second end of the signal source module 12 is connected to a second end of the fourth switch matrix 133;
the third terminal of the first switch matrix 131 is connected to the first terminal of the third switch matrix 142;
a second terminal of the third switch matrix 142 is connected to a first terminal of the dummy load matrix 141;
the second end of the dummy load matrix 141 is connected with the first end of the multimeter 143, and the multimeter 143 is externally connected to the dummy load matrix 141 through an interface;
a first end of the third-party application scene 15 is connected with a fourth end of the first switch matrix 131 to form a measurement loop;
a third terminal of the fourth switch matrix 133 is connected to a first terminal of the second switch matrix 132;
a second terminal of the second switch matrix 132 is connected to a first terminal of the self-test circuit 16;
the third terminal of the second switch matrix 132 is connected to one terminal of the loopback circuit 17;
the fourth terminal of the second switch matrix 132 is connected to the other terminal of the third party application scenario 15.
In the embodiment, when the signal source module 12 is used for ac, the dc component is isolated by the internal switch of the signal source module 12, so that the ac component is only transmitted on a high-speed path, and the signal integrity is ensured. And the signal is enabled to realize local self-test, loop test and external equipment application in the application by setting the level of the second switch matrix.
Next, a specific application scenario of the dc signal branch in a specific embodiment is given in the present application:
s1, a controller sends out a logic signal through a control bus to control an input/output expansion chip to control a switch matrix to carry out switch gating;
s2, setting the first switch matrix to be LS53:0x25_P4_1; LS52:0x25_P4_2 & LS51:0x25_P4_0; setting a mechanical relay switch matrix to be at a high level;
the first switch matrix is a mechanical relay switch matrix, LS53, LS52 and LS51 are switch names in the mechanical relay switch matrix, as shown in fig. 3, 0x25 is an address bit, and P4_1, P4_2 and P4_0 are controller numbers in the mechanical relay switch matrix; for example, P4_1 represents a second path of a fourth controller in the mechanical relay switch matrix, and other numbering meanings are similar to that, and are not described in detail herein.
Setting a dummy load low-temperature-drift precision resistor to 0, namely a low level;
the fourth switch matrix is set to a high level for switching off the ac component and improving the accuracy of the dc signal measurement, wherein,
the fourth switch matrix is a first resistance switch matrix;
s3, connecting the dummy load matrix with a digital multimeter through an external interface, reading a measurement result on the digital multimeter, storing the measurement result in a data storage, and reserving 7 effective digits after decimal point to obtain a reference current;
and S4, when the application needs to be connected to the third application scene module to expand more application scenes, configuring LS53, LS52 and LS51 to be set to 0 (low) and disconnecting the dummy load.
The application also provides a specific application scenario of the ac signal branch in a specific embodiment:
s1, the controller 11 controls the direct current signal to be turned off through the input/output expansion chip 18;
s2, ac signals are injected into the fourth switch matrix from the U _0 channel as in fig. 5, wherein,
the fourth switch matrix is a high-speed analog switch matrix,
setting 0x20_P2 _0to 1, and opening an alternating current channel;
0x21_P2 _0is set to 1, the DC component is turned off;
either 0xf20 _p4 _or0xf21 _p4_, 0 is set to 1, the alternating current signal is made to go to the second switch matrix 132,
wherein 0x20 and 0x21 are address bits, and P2_0, P4_0 and P4_4 are controller numbers in the high-speed analog switch matrix; for example, P2_0 represents the first path of the second controller, and the meaning of other numbers is similar, and will not be described herein again.
And S3, different application functions are realized by switching the second switch matrix, so that the alternating current signal is led to the self-test circuit 16, the loop back circuit 17 or the third-party application scene 15.
The method and the device can save the cost of the source meter by carrying out direct current/alternating current test, and the impedance matching consistency is easy to control. In the prior art, a plurality of digital source meters are needed to realize multi-channel test and application, and the method can be separated from the constraint of the source meters only by using the source meters to measure the dummy load resistance and calibrate one channel during alternating current, so that the source meters can be used as universal reference equipment. According to the method and the device, different paths are taken through different signal types, so that the circuit performance maximization is realized, high-reliability data are obtained, large-scale signal loop diagnosis can be carried out, and the signals can be ensured not to be distorted.
It should be understood that the above-described embodiments of the present invention are examples for clearly illustrating the invention, and are not to be construed as limiting the embodiments of the present invention, and it will be obvious to those skilled in the art that various changes and modifications can be made on the basis of the above description, and it is not intended to exhaust all embodiments, and obvious changes and modifications can be made on the basis of the technical solutions of the present invention.
Claims (7)
1. A signal control circuit, comprising: a signal source module, a switch matrix circuit, and a controller, wherein,
the signal source module is configured to provide signal sources required by the switch matrix circuit, and the signal sources comprise direct current signals and/or alternating current signals;
the switch matrix circuit is connected to the signal source module and comprises a first transmission link for transmitting a direct current signal and a second transmission link for transmitting an alternating current signal;
an isolating switch is arranged in the signal source module so as to isolate alternating current signals for the first transmission link;
the first transmission link comprises a first switch matrix for gating signals to a dummy load loop and/or a third party application scenario;
the second transmission link includes a second switching matrix for gating signals to third party application scenarios and/or self-test circuits and/or loopback circuits.
2. The circuit of claim 1, wherein the dummy load loop comprises: the device comprises a dummy load matrix, a third switch matrix used for gating the dummy load matrix and a universal meter externally connected to two sides of the dummy load matrix.
3. The circuit of claim 2, wherein the dummy load matrix is a resistor matrix, and each resistor in the resistor matrix has a different resistance value to accommodate different dc signals.
4. The circuit of claim 2, wherein the first switch matrix and the third switch matrix are optical coupler switch matrices or mechanical relay switch matrices, and the second switch matrix is an analog switch matrix.
5. The circuit of claim 1, wherein the second transmission link includes a fourth switch matrix to isolate the dc signal for the second transmission link.
6. The circuit of claim 1, wherein the controller implements logic control of the switch matrix circuit via an input/output expansion chip.
7. The circuit of claim 1, wherein the signal source module, the controller, the input/output expansion chip, and the switch matrix circuit communicate via an integrated circuit bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211250277.0A CN115328006B (en) | 2022-10-13 | 2022-10-13 | Signal control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211250277.0A CN115328006B (en) | 2022-10-13 | 2022-10-13 | Signal control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115328006A CN115328006A (en) | 2022-11-11 |
| CN115328006B true CN115328006B (en) | 2023-01-20 |
Family
ID=83914422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211250277.0A Active CN115328006B (en) | 2022-10-13 | 2022-10-13 | Signal control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115328006B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202330684U (en) * | 2011-11-10 | 2012-07-11 | 北京自动测试技术研究所 | Calibration module for VXI (VME (Virtual Machine Environment) Extensions for Instrumentation) bus digital testing system |
| CN103675647A (en) * | 2013-12-10 | 2014-03-26 | 中国船舶重工集团公司第七〇九研究所 | Calibration device and method based on integrated circuit standard sample |
| CN112345862A (en) * | 2020-11-05 | 2021-02-09 | 山东山大电力技术股份有限公司 | Test tool system and method for three-terminal isolation sampling module |
| CN214504211U (en) * | 2021-01-05 | 2021-10-26 | 珠海欧比特宇航科技股份有限公司 | Flying parameter recorder test system |
| CN114252798A (en) * | 2021-12-15 | 2022-03-29 | 杭州长川科技股份有限公司 | Large-current pulse power supply output calibration method and device and electronic equipment |
| CN114384396A (en) * | 2021-12-16 | 2022-04-22 | 锦州七七七微电子有限责任公司 | Information preprocessing module circuit test system |
| CN114994563A (en) * | 2022-06-30 | 2022-09-02 | 天津普智芯网络测控技术有限公司 | Power supply test system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA947818A (en) * | 1970-07-27 | 1974-05-21 | David P. Rogers | Apparatus for measuring the in-circuit impedance of a circuit component |
| CN108152776A (en) * | 2017-11-23 | 2018-06-12 | 北京无线电计量测试研究所 | A kind of portable digital table characteristic measuring device |
-
2022
- 2022-10-13 CN CN202211250277.0A patent/CN115328006B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202330684U (en) * | 2011-11-10 | 2012-07-11 | 北京自动测试技术研究所 | Calibration module for VXI (VME (Virtual Machine Environment) Extensions for Instrumentation) bus digital testing system |
| CN103675647A (en) * | 2013-12-10 | 2014-03-26 | 中国船舶重工集团公司第七〇九研究所 | Calibration device and method based on integrated circuit standard sample |
| CN112345862A (en) * | 2020-11-05 | 2021-02-09 | 山东山大电力技术股份有限公司 | Test tool system and method for three-terminal isolation sampling module |
| CN214504211U (en) * | 2021-01-05 | 2021-10-26 | 珠海欧比特宇航科技股份有限公司 | Flying parameter recorder test system |
| CN114252798A (en) * | 2021-12-15 | 2022-03-29 | 杭州长川科技股份有限公司 | Large-current pulse power supply output calibration method and device and electronic equipment |
| CN114384396A (en) * | 2021-12-16 | 2022-04-22 | 锦州七七七微电子有限责任公司 | Information preprocessing module circuit test system |
| CN114994563A (en) * | 2022-06-30 | 2022-09-02 | 天津普智芯网络测控技术有限公司 | Power supply test system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115328006A (en) | 2022-11-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5608330A (en) | Method for calibrating a network analyzer according to the seven-term principle | |
| CN202694136U (en) | Multichannel thermal control system testing equipment | |
| JP2807177B2 (en) | Circuit network measuring device and calibration method | |
| CN111123076A (en) | Calibration device and automatic test equipment | |
| JPS6336165A (en) | Automatic test apparatus | |
| CN212008827U (en) | Calibration device and automatic test equipment | |
| CN101701971A (en) | High-precision multichannel analog signal source | |
| JPH07191100A (en) | Analog multichannel probe device | |
| CN204595098U (en) | Micro-resistance testing device | |
| CN115328006B (en) | Signal control circuit | |
| CN114675168A (en) | Calibration interface board and system of universal card slot of automatic integrated circuit test equipment | |
| CN105045748A (en) | PVIB special virtual apparatus bus | |
| CN202599568U (en) | Output resistor suitable for platinum resistance thermometer sensor analog board | |
| CN112816784B (en) | Resistance test circuit and system | |
| US5627476A (en) | Milliohm impedance measurement | |
| TW562949B (en) | Circuit for improved test and calibration in automated test equipment | |
| CN209858645U (en) | Data acquisition system based on scattering parameter cascade | |
| CN102722976B (en) | Temperature-measuring transmission device for space-borne equipment | |
| CN110456210A (en) | 1553B network-bus trouble point checking method, apparatus and system | |
| CN210923928U (en) | 1553B network bus fault point detection system | |
| CN211085507U (en) | Single ADC multichannel temperature monitoring circuit controlled by GPIO | |
| CA1173943A (en) | Semiconductor crosspoint linearizing arrangement | |
| EP0309802B1 (en) | Interface circuit for connecting test instrumentation | |
| CN218767165U (en) | Automatic testing arrangement of batch electron device | |
| CN220064295U (en) | Test circuit and circuit board |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |