CN216593495U - Detection circuit and detection box for testing four-channel sensor - Google Patents
Detection circuit and detection box for testing four-channel sensor Download PDFInfo
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- CN216593495U CN216593495U CN202122594364.5U CN202122594364U CN216593495U CN 216593495 U CN216593495 U CN 216593495U CN 202122594364 U CN202122594364 U CN 202122594364U CN 216593495 U CN216593495 U CN 216593495U
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Abstract
The utility model provides a detection circuit and a detection box for testing a four-channel sensor, comprising: the device comprises a power supply, a transformer, a test unit connected with a four-channel sensor, a control unit used for switching test channels and a display unit used for displaying a test state; the power supply is respectively connected with the test unit and the transformer; the control unit and the display unit are respectively connected with the transformer; the power supply supplies power to the control unit and the display unit after the voltage of the power supply is changed by the transformer. The detection circuit disclosed by the utility model is simple in integral structure and convenient to operate, can effectively reduce the investment of test equipment, simplifies the operation steps during production and final detection, and can avoid missing detection and error detection caused by human negligence during detection.
Description
Technical Field
The utility model relates to the technical field of sensor testing, in particular to a detection circuit and a detection box for testing a four-channel sensor.
Background
When the existing four-channel sensor is debugged and detected, 2 sets of double-integrated oscilloscopes, 1 set of four-channel oscilloscopes and other testing equipment are needed, the equipment is complex to use, the test is tedious, mistakes are easy to make, the testing efficiency is low, and the large-batch detection is not facilitated.
In view of the above, the present invention is particularly proposed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a detection circuit for testing a four-channel sensor, which is simple to operate and high in testing efficiency, can realize the detection of different channels by arranging a testing unit to be matched with a control unit, can realize the indication effect by arranging a display unit, and is convenient for a user to know the current testing state; the detection circuit has the advantages of small quantity of whole equipment, low cost and capability of effectively improving the detection precision.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the utility model provides a detection circuit for testing a four-channel sensor, which comprises: the device comprises a power supply, a transformer, a test unit connected with a four-channel sensor, a control unit used for switching test channels and a display unit used for displaying a test state;
the power supply is respectively connected with the test unit and the transformer; the control unit and the display unit are respectively connected with the transformer; the power supply supplies power to the control unit and the display unit after being transformed by the transformer.
The detection circuit can realize the test of each channel of the four-channel sensor in one circuit by arranging the test unit, thereby being beneficial to improving the test efficiency; by arranging the control unit, the test channel connected with the test unit can be replaced as required, so that the operation is simplified; by arranging the display unit, the test state can be displayed in real time, so that the working state of the circuit is visualized; in addition, the whole wiring of the detection circuit is fixed, and the test state can be switched only by operating the control unit, so that the conditions of defective products and missed detection caused by human negligence are effectively avoided.
Preferably, the test unit comprises normally closed contacts KA1-1, KA1-2, normally open contacts KA1-3 and KA1-4 of the first relay, normally closed contacts KA2-1 and KA2-2 of the second relay, normally open contacts KA2-3 and KA2-4, normally closed contacts KA3-1 and KA3-2 of the third relay, normally open contacts KA3-3 and KA3-4 of the third relay and an oscilloscope;
a first output end 1CH of a four-channel sensor to be tested, the normally closed contact KA1-1, the normally closed contact KA3-1 and a first probe of the oscilloscope are connected in series to form a first test branch;
a first output end 1CH of the four-channel sensor to be tested, the normally closed contact KA2-1, the normally open contact KA3-3 and a first probe of the oscilloscope are connected in series to form a second test branch;
a second output end 2CH of the four-channel sensor to be tested, the normally closed contact KA1-2, the normally closed contact KA3-2 and a second probe of the oscilloscope are connected in series to form a third test branch;
a second output end 2CH of the four-channel sensor to be tested, the normally open contact KA2-3, the normally open contact KA3-3 and the first probe of the oscilloscope are connected in series to form a fourth test branch;
a third output end 3CH of the four-channel sensor to be tested, the normally open contact KA1-3, the normally closed contact KA3-1 and the first probe of the oscilloscope are connected in series to form a fifth test branch;
a third output end 3CH of the four-channel sensor to be tested, the normally closed contact KA2-2, the normally open contact KA3-4 and a second probe of the oscilloscope are connected in series to form a sixth test branch;
a fourth output end 4CH of the four-channel sensor to be tested, the normally open contact KA1-4, the normally closed contact KA3-2 and a second probe of the oscilloscope are connected in series to form a seventh test branch;
and a fourth output end 4CH of the four-channel sensor to be tested, the normally open contact KA2-4, the normally open contact KA3-4 and a second probe of the oscilloscope are connected in series to form an eighth test branch.
Through setting up a plurality of test branches, can play the test action to all passageways, improve efficiency of software testing, and the measuring accuracy is high.
Preferably, a resistance state switching circuit is arranged between the power supply and the test unit in series, and the resistance state switching circuit comprises normally open contacts KA4-1 and KA4-3, normally closed contacts KA4-2 and KA4-4, and resistors R1 and R2 of a fourth relay;
the negative electrode of the power supply, the normally open contact KA4-1, the resistor R1 and a first probe of the oscilloscope are connected in series to form a first switching branch;
the negative electrode of the power supply, the normally open contact KA4-3, the resistor R2 and a second probe of the oscilloscope are connected in series to form a second switching branch circuit;
the positive electrode of the power supply, the normally closed contact KA4-2, the resistor R1 and the first probe of the oscilloscope are connected in series to form a third switching branch circuit;
the positive electrode of the power supply, the normally closed contact KA4-4, the resistor R2 and the second probe of the oscilloscope are connected in series to form a fourth switching branch.
The resistance state switching circuit is arranged, so that the pull-up resistor or the pull-down resistor can be switched according to requirements, and the requirements of a signal on the pull-up resistor or the pull-down resistor are tested.
Preferably, the control unit comprises a starting button switch SB2-1, SB3-1, SB4-1, SB4-2, SB6, a stopping button switch SB1, SB2-2, SB3-2, SB5, a normally open contact KA1-5 of the first relay, a coil KA1, a normally open contact KA2-5 of the second relay, a coil KA2, a normally open contact KA3-5 of the third relay, a coil KA3, a normally open contact KA4-5 of the fourth relay and a coil KA 4;
the second output end of the transformer is connected with the stop button switch SB1, the start button switch SB2-1, the coil KA1 and the first output end of the transformer in series to form a first control loop; the normally open contact KA1-5 is connected with the starting button switch SB2-1 in parallel;
the second output end of the transformer is connected with the stop button switch SB1, the start button switch SB3-1, the stop button switch SB2-2, the coil KA3 and the first output end of the transformer in series to form a second control loop; the normally open contact KA3-5 and the starting button switch SB4-1 are connected with the starting button switch SB3-1 in parallel;
the second output end of the transformer is connected in series with the stop button switch SB1, the start button switch SB4-2, the stop button switch SB3-2, the coil KA2 and the first output end of the transformer to form a third control loop; the normally open contact KA2-5 is connected with the starting button switch SB4-2 in parallel;
the second output end of the transformer is connected with the stop button switch SB5, the start button switch SB6, the coil KA4 and the first output end of the transformer in series to form a third control loop; the normally open contact KA4-5 is connected in parallel with the start button switch SB 6.
When the device is used, the corresponding buttons are pressed according to use requirements, the corresponding contacts are driven to work through power on and power off control of different coils, and then the channels 1-2, 3-4, 2-4 and 1-3 of the four-channel sensor to be tested can be tested respectively, so that the device is simple to operate and convenient to use.
Preferably, the start button switch SB2-1 and the stop button switch SB2-2, the start button switch SB3-1 and the stop button switch SB3-2, and the start button switch SB4-1 and the start button switch SB4-1 are respectively combined with each other into a first combination switch, a second combination switch, and a third combination switch. The setting mode conforming to the switch is adopted to realize the combined switching of circuit connection, thereby realizing one-key switching of the test state and further simplifying the test steps.
Preferably, the control unit further comprises diodes D1, D2, D3 and D4, the diode D1 is connected in anti-phase parallel with the coil KA 1; the diode D2 is connected in anti-phase parallel with the coil KA 2; the diode D3 is connected in anti-phase parallel with the coil KA 3; the diode D4 is connected in anti-phase parallel with the coil KA 4. The diodes are arranged in anti-phase parallel connection, so that the coil can be protected, and the service life of the whole circuit is prolonged.
Preferably, the display unit comprises a normally closed contact KA1-6, a normally open contact KA1-7 of the first relay, a normally open contact KA2-6 of the second relay, a normally closed contact KA2-7, a normally open contact KA3-6 of the third relay, a normally closed contact KA3-7, a normally closed contact KA4-6 of the fourth relay, a normally open contact KA4-7, an indicator light L1, an indicator light L2, an indicator light L3, an indicator light L4, an indicator light L5 and an indicator light L6;
the normally closed contact KA1-6 and the indicator light L1 are connected in series to form a first display branch;
the normally open contact KA1-7, the normally closed contact KA3-7 and the indicator light L2 are connected in series to form a second display branch;
the normally open contact KA3-6, the normally closed contact KA2-7 and the indicator lamp L3 are connected in series to form a third display branch;
the normally open contact KA2-6 and the indicator lamp L4 are connected in series to form a fourth display branch;
the normally closed contact KA4-6 and the indicator lamp L5 are connected in series to form a fifth display branch;
the normally closed contact KA4-7 and the indicator lamp L6 are connected in series to form a sixth display branch;
the first display branch, the second display branch, the third display branch, the fourth display branch, the fifth display branch and the sixth display branch are connected in parallel, and after the first display branch, the second display branch, the third display branch, the fourth display branch, the fifth display branch and the sixth display branch are connected in parallel, one end of the first display branch is connected with the first output end of the transformer, and the other end of the first display branch is connected with the second output end of the transformer.
In the utility model, each display branch of the display unit can respectively display the working state of the circuit, wherein the indicator light L1 lights the first output end and the second output end of the four-channel sensor which is currently tested; indicator light L2 lights indicating that the fourth output and the third output of the four-channel sensor are currently being tested; indicator light L3 lights indicating that the four-channel sensor is currently being tested at the first and third outputs; indicator light L4 lights indicating that the second output and the fourth output of the four-channel sensor are currently being tested; the indicator light L5 is on to indicate that the currently connected resistor is a pull-up resistor; indicator light L6 lights indicating that a pull-down resistor is currently connected. The resistor used in the utility model is a 10K omega resistor.
The present invention also provides a cartridge for testing a four-channel sensor, comprising: the casing, be provided with foretell detection circuitry in the casing. The detection box is simple in overall structure, convenient to use and high in test accuracy.
Compared with the prior art, the utility model has the beneficial effects that:
the detection circuit disclosed by the utility model is simple in integral structure and convenient to operate, can effectively reduce the investment of test equipment, simplifies the operation steps during production and final detection, and can avoid missing detection and error detection caused by human negligence during detection.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a circuit schematic diagram of a detection circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are a part of the embodiments of the present invention, rather than all of the embodiments, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The instruments used are not indicated by the manufacturer, and are all conventional products available by commercial purchase.
In order to more clearly illustrate the technical solution of the present invention, the following description is made in the form of specific embodiments.
Examples
Referring to fig. 1, the present embodiment provides a detection circuit for testing a four-channel sensor, including: the device comprises a power supply, a transformer, a test unit connected with a four-channel sensor, a control unit used for switching test channels and a display unit used for displaying a test state;
the power supply is respectively connected with the test unit and the transformer; the control unit and the display unit are respectively connected with the transformer; the power supply supplies power to the control unit and the display unit after being transformed by the transformer.
The testing unit comprises normally closed contacts KA1-1, KA1-2, normally open contacts KA1-3 and KA1-4 of the first relay, normally closed contacts KA2-1 and KA2-2 of the second relay, normally open contacts KA2-3 and KA2-4 of the third relay, normally closed contacts KA3-1 and KA3-2 of the third relay, normally open contacts KA3-3 and KA3-4 of the third relay and an oscilloscope; the oscilloscope adopted in the embodiment is a double-synthesis oscilloscope.
A first output end 1CH of the four-channel sensor to be tested, a normally closed contact KA1-1, a normally closed contact KA3-1 and a first probe of the oscilloscope are connected in series to form a first test branch;
a first output end 1CH of the four-channel sensor to be tested, a normally closed contact KA2-1, a normally open contact KA3-3 and a first probe of the oscilloscope are connected in series to form a second test branch;
a second output end 2CH of the four-channel sensor to be tested, a normally closed contact KA1-2, a normally closed contact KA3-2 and a second probe of the oscilloscope are connected in series to form a third testing branch;
a second output end 2CH of the four-channel sensor to be tested, a normally open contact KA2-3, a normally open contact KA3-3 and a first probe of the oscilloscope are connected in series to form a fourth test branch;
a third output end 3CH of the four-channel sensor to be tested, a normally open contact KA1-3, a normally closed contact KA3-1 and a first probe of the oscilloscope are connected in series to form a fifth test branch;
a third output end 3CH of the four-channel sensor to be tested, a normally closed contact KA2-2, a normally open contact KA3-4 and a second probe of the oscilloscope are connected in series to form a sixth testing branch;
a fourth output end 4CH of the four-channel sensor to be tested, a normally open contact KA1-4, a normally closed contact KA3-2 and a second probe of the oscilloscope are connected in series to form a seventh test branch;
and a fourth output end 4CH of the four-channel sensor to be tested, a normally open contact KA2-4, a normally open contact KA3-4 and a second probe of the oscilloscope are connected in series to form an eighth testing branch.
Continuing to refer to fig. 1, a resistance state switching circuit is arranged between the power supply and the test unit in series, and comprises normally open contacts KA4-1 and KA4-3, normally closed contacts KA4-2 and KA4-4, resistors R1 and R2 of a fourth relay;
a power supply negative electrode, a normally open contact KA4-1, a resistor R1 and a first probe of the oscilloscope are connected in series to form a first switching branch;
a negative electrode of the power supply, a normally open contact KA4-3, a resistor R2 and a second probe of the oscilloscope are connected in series to form a second switching branch circuit;
the positive electrode of the power supply, the normally closed contact KA4-2, the resistor R1 and the first probe of the oscilloscope are connected in series to form a third switching branch circuit;
the positive electrode of the power supply, the normally closed contact KA4-4, the resistor R2 and a second probe of the oscilloscope are connected in series to form a fourth switching branch.
In the embodiment, the control unit comprises a starting button switch SB2-1, SB3-1, SB4-1, SB4-2, SB6, a stopping button switch SB1, SB2-2, SB3-2, SB5, a normally open contact KA1-5 of the first relay, a coil KA1, a normally open contact KA2-5 of the second relay, a coil KA2, a normally open contact KA3-5 of the third relay, a coil KA3, a normally open contact KA4-5 of the fourth relay and a coil KA 4;
the second output end of the transformer is connected with the stop button switch SB1, the start button switch SB2-1, the coil KA1 and the first output end of the transformer in series to form a first control loop; the normally open contact KA1-5 is connected with the starting button switch SB2-1 in parallel;
the second output end of the transformer is connected with the stop button switch SB1, the start button switch SB3-1, the stop button switch SB2-2, the coil KA3 and the first output end of the transformer in series to form a second control loop; the normally open contact KA3-5 and the starting button switch SB4-1 are connected with the starting button switch SB3-1 in parallel;
the second output end of the transformer is connected with the stop button switch SB1, the start button switch SB4-2, the stop button switch SB3-2, the coil KA2 and the first output end of the transformer in series to form a third control loop; the normally open contact KA2-5 is connected with the starting button switch SB4-2 in parallel;
the second output end of the transformer is connected with the stop button switch SB5, the start button switch SB6, the coil KA4 and the first output end of the transformer in series to form a third control loop; normally open contact KA4-5 is connected in parallel with start button switch SB 6.
Wherein, the starting button switch SB2-1 and the stopping button switch SB2-2, the starting button switch SB3-1 and the stopping button switch SB3-2, and the starting button switch SB4-1 and the starting button switch SB4-1 are respectively compounded into a first compound switch, a second compound switch and a third compound switch. The setting mode conforming to the switch is adopted to realize the combined switching of circuit connection, thereby realizing one-key switching of the test state and further simplifying the test steps.
In order to protect the coil, the control unit of the embodiment further comprises diodes D1, D2, D3 and D4, and the diode D1 is connected in anti-phase parallel with the coil KA 1; the diode D2 is connected in anti-phase parallel with the coil KA 2; the diode D3 is connected in anti-phase parallel with the coil KA 3; the diode D4 is connected in anti-phase parallel with the coil KA 4.
When the device is used, the corresponding buttons are pressed according to use requirements, the corresponding contacts are driven to work through power on and power off control of different coils, and then the channels 1-2, 3-4, 2-4 and 1-3 of the four-channel sensor to be tested can be tested respectively, so that the device is simple to operate and convenient to use.
In the embodiment, the display unit comprises normally closed contacts KA1-6, KA1-7 of the first relay, KA2-6 of the second relay, KA2-7 of the normally closed contacts, KA3-6 of the third relay, KA3-7 of the normally closed contacts, KA4-6 of the fourth relay, KA4-7 of the normally open contacts, indicator lights L1, L2, L3, L4, L5 and L6 of the fourth relay;
the normally closed contact KA1-6 and the indicator lamp L1 are connected in series to form a first display branch;
the normally open contact KA1-7, the normally closed contact KA3-7 and the indicator lamp L2 are connected in series to form a second display branch;
the normally open contact KA3-6, the normally closed contact KA2-7 and the indicator lamp L3 are connected in series to form a third display branch;
the normally open contact KA2-6 and the indicator lamp L4 are connected in series to form a fourth display branch;
the normally closed contact KA4-6 and the indicator lamp L5 are connected in series to form a fifth display branch;
the normally closed contact KA4-7 and the indicator lamp L6 are connected in series to form a sixth display branch;
the first display branch circuit, the second display branch circuit, the third display branch circuit, the fourth display branch circuit, the fifth display branch circuit and the sixth display branch circuit are connected in parallel, and after the first display branch circuit, the third display branch circuit, the fourth display branch circuit, the fifth display branch circuit and the sixth display branch circuit are connected in parallel, one end of the first display branch circuit is connected with the first output end of the transformer, and the other end of the first display branch circuit is connected with the second output end of the transformer.
When the circuit is used, each display branch of the display unit can respectively display the working state of the circuit, wherein the indicator lamp L1 lights the first output end and the second output end of the four-channel sensor which is currently tested; indicator light L2 lights indicating that the fourth output and the third output of the four-channel sensor are currently being tested; indicator light L3 lights indicating that the four-channel sensor is currently being tested at the first and third outputs; indicator light L4 lights indicating that the second output and the fourth output of the four-channel sensor are currently being tested; the indicator light L5 is on to indicate that the currently connected resistor is a pull-up resistor; indicator light L6 lights indicating that a pull-down resistor is currently connected. The resistor used in the utility model is a 10K omega resistor.
The present embodiment uses a relay for interlock control, and it will be understood by those skilled in the art that the relay may be replaced with a contactor when the current of the circuit is large.
The present embodiment also provides a cartridge for testing a four-channel sensor, including: the casing, be provided with foretell detection circuitry in the casing.
The detection circuit of the present embodiment uses the following principle:
during detection, the four-channel sensor is firstly connected into the circuit. In a default state of the circuit, the first output end 1CH and the second output end 2CH are detected under the condition of a pull-up resistor, and at the moment, the indicator lamp L1 is on; when the third output end 3CH and the fourth output end 4CH need to be detected, a starting button switch SB2-1 is pressed, a coil KA1 is electrified, normally open contacts KA1-3, KA1-4, KA1-5 and KA1-7 are closed, normally closed contacts KA1-1, KA1-2 and KA1-6 are disconnected, the third output end 3CH and the fourth output end 4CH are communicated with an oscilloscope, and an indicator light L2 is bright;
when the first output end 1CH and the third output end 3CH need to be detected, a starting button switch SB3-1 is pressed, a coil KA3 is electrified, normally open contacts KA3-3, KA3-4, KA3-5 and KA3-6 are closed, normally closed contacts KA3-1, KA3-2 and KA3-7 are disconnected, the first output end 1CH and the third output end 3CH are communicated with an oscilloscope, and an indicator light L3 is bright;
when the second output end 2CH and the fourth output end 4CH need to be detected, a starting button switch SB4-2 is pressed, a coil KA2 is electrified, normally open contacts KA2-3, KA2-4, KA2-5 and KA2-6 are closed, normally closed contacts KA2-1, KA2-2 and KA2-7 are disconnected, the second output end 2CH and the fourth output end 4CH are communicated with an oscilloscope, and an indicator light L4 is bright;
the default state of the circuit is that a pull-up resistor is connected, and an indicator light L5 is on; when the pull-down resistor needs to be switched, the starting button switch SB6 is pressed, the coil KA4 is electrified, the normally open contacts KA4-1, KA4-3, KA4-5 and KA4-7 are closed, the normally closed contacts KA4-2, KA4-4 and KA4-6 are disconnected, the pull-down resistor is connected into the circuit, the indicator light L5 is turned off, and the indicator light L6 is turned on.
In a word, the detection circuit provided by the utility model has a simple overall structure, is convenient to operate, can effectively reduce the investment of test equipment, simplifies the operation steps during production and final detection, and can avoid missing detection and error detection caused by human negligence during detection.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A detection circuit for testing a four-channel sensor, comprising: the device comprises a power supply, a transformer, a test unit connected with a four-channel sensor, a control unit used for switching test channels and a display unit used for displaying a test state;
the power supply is respectively connected with the test unit and the transformer; the control unit and the display unit are respectively connected with the transformer; the power supply supplies power to the control unit and the display unit after being transformed by the transformer.
2. The detection circuit according to claim 1, wherein the test unit comprises normally closed contacts KA1-1, KA1-2, normally open contacts KA1-3, KA1-4 of the first relay, normally closed contacts KA2-1, KA2-2 of the second relay, normally open contacts KA2-3, KA2-4, normally closed contacts KA3-1, KA3-2 of the third relay, normally open contacts KA3-3, KA3-4 of the third relay and an oscilloscope;
a first output end 1CH of a four-channel sensor to be tested, the normally closed contact KA1-1, the normally closed contact KA3-1 and a first probe of the oscilloscope are connected in series to form a first test branch;
a first output end 1CH of the four-channel sensor to be tested, the normally closed contact KA2-1, the normally open contact KA3-3 and a first probe of the oscilloscope are connected in series to form a second test branch;
a second output end 2CH of the four-channel sensor to be tested, the normally closed contact KA1-2, the normally closed contact KA3-2 and a second probe of the oscilloscope are connected in series to form a third test branch;
a second output end 2CH of the four-channel sensor to be tested, the normally open contact KA2-3, the normally open contact KA3-3 and the first probe of the oscilloscope are connected in series to form a fourth test branch;
a third output end 3CH of the four-channel sensor to be tested, the normally open contact KA1-3, the normally closed contact KA3-1 and the first probe of the oscilloscope are connected in series to form a fifth test branch;
a third output end 3CH of the four-channel sensor to be tested, the normally closed contact KA2-2, the normally open contact KA3-4 and a second probe of the oscilloscope are connected in series to form a sixth test branch;
a fourth output end 4CH of the four-channel sensor to be tested, the normally open contact KA1-4, the normally closed contact KA3-2 and a second probe of the oscilloscope are connected in series to form a seventh test branch;
and a fourth output end 4CH of the four-channel sensor to be tested, the normally open contact KA2-4, the normally open contact KA3-4 and a second probe of the oscilloscope are connected in series to form an eighth test branch.
3. The detection circuit according to claim 2, wherein a resistance state switching circuit is arranged in series between the power supply and the test unit, and comprises normally open contacts KA4-1, KA4-3, normally closed contacts KA4-2, KA4-4, resistors R1 and R2 of a fourth relay;
the negative electrode of the power supply, the normally open contact KA4-1, the resistor R1 and a first probe of the oscilloscope are connected in series to form a first switching branch;
the negative electrode of the power supply, the normally open contact KA4-3, the resistor R2 and a second probe of the oscilloscope are connected in series to form a second switching branch circuit;
the positive electrode of the power supply, the normally closed contact KA4-2, the resistor R1 and the first probe of the oscilloscope are connected in series to form a third switching branch circuit;
the positive electrode of the power supply, the normally closed contact KA4-4, the resistor R2 and the second probe of the oscilloscope are connected in series to form a fourth switching branch.
4. The detection circuit according to claim 1, wherein the control unit includes an activation button switch SB2-1, SB3-1, SB4-1, SB4-2, SB6, a stop button switch SB1, SB2-2, SB3-2, SB5, a normally open contact KA1-5 of the first relay, a coil KA1, a normally open contact KA2-5 of the second relay, a coil KA2, a normally open contact KA3-5 of the third relay, a coil KA3, a normally open contact KA4-5 of the fourth relay, and a coil KA 4;
the second output end of the transformer is connected with the stop button switch SB1, the start button switch SB2-1, the coil KA1 and the first output end of the transformer in series to form a first control loop; the normally open contact KA1-5 is connected with the starting button switch SB2-1 in parallel;
the second output end of the transformer is connected with the stop button switch SB1, the start button switch SB3-1, the stop button switch SB2-2, the coil KA3 and the first output end of the transformer in series to form a second control loop; the normally open contact KA3-5 and the starting button switch SB4-1 are connected with the starting button switch SB3-1 in parallel;
the second output end of the transformer is connected in series with the stop button switch SB1, the start button switch SB4-2, the stop button switch SB3-2, the coil KA2 and the first output end of the transformer to form a third control loop; the normally open contact KA2-5 is connected with the starting button switch SB4-2 in parallel;
the second output end of the transformer is connected with the stop button switch SB5, the start button switch SB6, the coil KA4 and the first output end of the transformer in series to form a third control loop; the normally open contact KA4-5 is connected in parallel with the start button switch SB 6.
5. The detection circuit according to claim 4, wherein the start button switch SB2-1 and the stop button switch SB2-2, the start button switch SB3-1 and the stop button switch SB3-2, and the start button switch SB4-1 and the start button switch SB4-1 are respectively multiplexed with each other into a first compound switch, a second compound switch and a third compound switch.
6. The detection circuit according to claim 4, wherein the control unit further comprises diodes D1, D2, D3 and D4, the diode D1 being connected in anti-phase parallel with the coil KA 1; the diode D2 is connected in anti-phase parallel with the coil KA 2; the diode D3 is connected in anti-phase parallel with the coil KA 3; the diode D4 is connected in anti-phase parallel with the coil KA 4.
7. The detection circuit according to claim 1, wherein the display unit comprises normally closed contacts KA1-6 of the first relay, normally open contacts KA1-7, normally open contacts KA2-6 of the second relay, normally closed contacts KA2-7, normally open contacts KA3-6 of the third relay, normally closed contacts KA3-7, normally closed contacts KA4-6 of the fourth relay, normally open contacts KA4-7, indicator lights L1, L2, L3, L4, L5 and L6;
the normally closed contact KA1-6 and the indicator light L1 are connected in series to form a first display branch;
the normally open contact KA1-7, the normally closed contact KA3-7 and the indicator light L2 are connected in series to form a second display branch;
the normally open contact KA3-6, the normally closed contact KA2-7 and the indicator lamp L3 are connected in series to form a third display branch;
the normally open contact KA2-6 and the indicator lamp L4 are connected in series to form a fourth display branch;
the normally closed contact KA4-6 and the indicator lamp L5 are connected in series to form a fifth display branch;
the normally closed contact KA4-7 and the indicator lamp L6 are connected in series to form a sixth display branch;
the first display branch, the second display branch, the third display branch, the fourth display branch, the fifth display branch and the sixth display branch are connected in parallel, and after the first display branch, the second display branch, the third display branch, the fourth display branch, the fifth display branch and the sixth display branch are connected in parallel, one end of the display branch is connected with the first output end of the transformer, and the other end of the display branch is connected with the second output end of the transformer.
8. A cartridge for testing a four-channel sensor, comprising: a housing having the detection circuit of any one of claims 1-7 disposed therein.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122594364.5U CN216593495U (en) | 2021-10-27 | 2021-10-27 | Detection circuit and detection box for testing four-channel sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122594364.5U CN216593495U (en) | 2021-10-27 | 2021-10-27 | Detection circuit and detection box for testing four-channel sensor |
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| CN216593495U true CN216593495U (en) | 2022-05-24 |
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