Power line for detector burning and power-on test

Abstract

The utility model provides a power line for burning and power-on test of a detector, which comprises a switch box, a switch, a first power line, a second power line, a first plug and a second plug, and is characterized in that the switch comprises a first positive terminal, a second positive terminal, a first negative terminal and a second negative terminal; a positive wire and a negative wire of the first power line are respectively connected with a first positive terminal and a first negative terminal through a first positive bolt and a first negative bolt, and a positive wire and a negative wire of the second power line are respectively connected with a second positive terminal and a second negative terminal through a second positive bolt and a second negative bolt. The first plug is connected with one end of the first power line away from the switch box, and the second plug is connected with one end of the second power line away from the switch box. The power line for detector burning and power-on test can prevent a circuit of the detector from being damaged in burning, and reduces the scrap risk of the detector product in the manufacturing process.

Description

Technical Field

[0001] This utility model belongs to the field of power-on / off technology of detectors, and relates to a power cord used for detector programming and power-on testing. Background Technology

[0002] Detector programming refers to writing data into the detector's storage medium during the detector manufacturing process. First, a programmer is needed. Then, the appropriate programming fixture and software are located according to the detector model. With the assistance of the programming software, the detector programming process is completed. After programming, a basic power-on test is performed on the detector using a Flexible Flat Cable (FFC) fixture to confirm key indicators such as image quality, configuration parameters, and voltage. After confirming that all detector indicators are normal, the detector is powered off. In actual factory manufacturing processes, to ensure efficient detector programming, an external power supply is connected to multiple detectors, and this external power supply is always energized. Powering off the detectors can only be done by directly plugging and unplugging the power cable. However, because current and voltage still exist on the power cable during this process, this method of power-off can easily damage the chips on the detector board. Furthermore, to meet the demand for increasingly smaller board areas, the components on the substrate are becoming increasingly dense, making the scrap rate of detector products due to directly plugging and unplugging the power cable even more severe.

[0003] Therefore, how to provide a power cord for detector programming and power-on testing to avoid circuit damage during programming and reduce the risk of scrapping detector products during manufacturing has become an important problem that needs to be solved by those skilled in the art.

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a power cord for detector programming and power-on testing, so as to solve the problem of circuit damage and product scrap caused by directly plugging and unplugging the power cord during the programming process of the detector in the prior art.

[0006] To achieve the above and other related objectives, this utility model provides a power cord for detector programming and power-on testing, comprising:

[0007] A switch box, wherein a pair of side walls of the switch box are provided with a first interface and a second interface;

[0008] A switch is disposed in the switch box and includes a first positive terminal, a second positive terminal, a first negative terminal, and a second negative terminal. The first positive terminal and the second positive terminal are disposed opposite to each other, and the first negative terminal and the second negative terminal are disposed opposite to each other.

[0009] A first positive electrode bolt and a second positive electrode bolt, wherein the first positive electrode bolt is threadedly connected to the first positive electrode terminal, and the second positive electrode bolt is threadedly connected to the second positive electrode terminal;

[0010] The first negative electrode bolt and the second negative electrode bolt are threadedly connected to the first negative electrode terminal and the second negative electrode bolt is threadedly connected to the second negative electrode terminal.

[0011] A first power line and a second power line, wherein the first power line passes through the first interface and enters the switch box, and the second power line passes through the second interface and enters the switch box, wherein the positive wire of the first power line is connected to the first positive bolt, the negative wire of the first power line is connected to the first negative bolt, the positive wire of the second power line is connected to the second positive bolt, and the negative wire of the second power line is connected to the second negative bolt.

[0012] A first plug and a second plug, wherein the first plug is connected to the end of the first power cord away from the switch box, and the second plug is connected to the end of the second power cord away from the switch box.

[0013] Optionally, the switch box includes a top cover and a box body, the top cover being connected to the box body by fixing screws, and the top cover having a through hole.

[0014] Optionally, the switch includes a rocker switch and a cavity, the rocker switch being hinged to an opening at the top of the cavity, and the cavity being connected to the top cover through the through hole.

[0015] Optionally, the bottom of the cavity is further provided with a cross-shaped partition plate, in which the first positive electrode bolt, the second positive electrode bolt, the first negative electrode bolt and the second negative electrode bolt are respectively located in different spaces separated by the partition plate.

[0016] Optionally, the first interface includes a first threaded interface and a first threaded connector with threaded connection. The first threaded interface is disposed on the outer wall of one side of the housing, and the first threaded connector is sleeved on the first power line. The second interface includes a second threaded interface and a second threaded connector with threaded connection. The second threaded interface is disposed on the outer wall of the other side of the housing, and the second threaded connector is sleeved on the second power line.

[0017] Optionally, one of the first plug and the second plug is a female plug and the other is a male plug.

[0018] Optionally, the first plug is provided with a positive contact and a negative contact. The positive contact is connected to the positive line of the first power line, and the negative contact is connected to the negative line of the first power line. The number of positive contacts and negative contacts of the first plug is one or more.

[0019] Optionally, the second plug is provided with a positive contact and a negative contact. The positive contact is connected to the positive line of the second power line, and the negative contact is connected to the negative line of the second power line. The number of positive contacts and negative contacts of the second plug can be one or more.

[0020] Optionally, it further includes a first positive U-nut, a second positive U-nut, a first negative U-nut, and a second negative U-nut, wherein the first positive bolt passes through the first positive terminal and is connected to the first positive U-nut, the second positive bolt passes through the second positive terminal and is connected to the second positive U-nut, the first negative bolt passes through the first negative terminal and is connected to the first negative U-nut, and the second negative bolt passes through the second negative terminal and is connected to the second negative U-nut.

[0021] Optionally, a mounting component is fixed to the bottom surface of the box, and the mounting component is provided with mounting holes.

[0022] As described above, the power cord for detector programming and power-on testing of this utility model includes a switch box, a switch, a first positive bolt, a second positive bolt, a first negative bolt, a second negative bolt, a first power cord, a second power cord, a first plug, and a second plug. The switch box has a first interface and a second interface on a pair of side walls. The switch includes a first positive terminal, a second positive terminal, a first negative terminal, and a second negative terminal. The first positive terminal and the second positive terminal are opposite each other, and the first negative terminal and the second negative terminal are opposite each other. The first positive bolt is threaded to the first positive terminal, and the second positive bolt is threaded to the second positive terminal. The negative terminal bolt is threaded to the first negative terminal, and the second negative terminal bolt is threaded to the second negative terminal. The first power cable enters the switch box through the first interface, and the second power cable enters the switch box through the second interface. The positive and negative terminals of the first and second power cables are electrically connected via the first and second positive terminal bolts, respectively. The positive and negative terminals of the second power cables are also electrically connected via the second positive and second negative terminal bolts. The first plug is connected to the end of the first power cable furthest from the box, and the second plug is connected to the end of the second power cable furthest from the box. This utility model's power cable for detector programming and power-on testing can prevent circuit damage during programming and reduce the risk of detector product scrap during manufacturing. Attached Figure Description

[0023] Figure 1 The diagram shows the structure of the power cord used for detector programming and power-on testing according to this invention.

[0024] Figure 2 The diagram shown is a schematic of the structure obtained after removing the housing from the switch box in the power cord for detector programming and power-on testing according to this utility model.

[0025] Figure 3 The diagram shows the structure obtained after removing the top cover and the switch from the power cord used for detector programming and power-on testing according to this utility model.

[0026] Figure 4 The image shown is a front view of the first plug in the power cord for detector programming and power-on testing according to this invention.

[0027] Figure 5 The image shown is a front view of the second plug in the power cord for detector programming and power-on testing according to this invention.

[0028] Figure 6 The image shown is a bottom view of the power cord used for detector programming and power-on testing according to this invention.

[0029] Explanation of reference numerals in the attached figures

[0030] 1 Switch box

[0031] 101 Top Cover

[0032] 102 Boxes

[0033] 2. Fixing screws

[0034] 3 switches

[0035] 301 Switch Rocker

[0036] 302 cavity

[0037] 303 First positive terminal

[0038] 304 Second Positive Terminal

[0039] 305 First negative terminal

[0040] 306 Second negative terminal

[0041] 4 First positive electrode bolt

[0042] 5 Second positive electrode bolt

[0043] 6 First negative electrode bolt

[0044] 7 Second negative electrode bolt

[0045] 8 First power line

[0046] 9 Second power line

[0047] 10 Positive Line

[0048] 11 Negative line

[0049] 12 Positive Line

[0050] 13 Negative line

[0051] 14 First plug

[0052] 15 Second plug

[0053] 16. Divider

[0054] 17 First Interface

[0055] 1701 First Threaded Interface

[0056] 1702 First Threaded Joint

[0057] 18 Second Interface

[0058] 1801 Second Threaded Interface

[0059] 1802 Second Threaded Connector

[0060] 19 Positive contact

[0061] 20 Negative contact

[0062] 21 Positive contact

[0063] 22 Negative contact

[0064] 23 First positive U-shaped nut

[0065] 24 Second positive U-shaped nut

[0066] 25 First negative U-shaped nut

[0067] 26 Second negative U-shaped nut

[0068] 27 Installation Components

[0069] 28 mounting holes Detailed Implementation

[0070] Hot-swapping is a circuit damage caused by improper grounding. During hot-swapping, circuit instability is easily caused, leading to voltage and current fluctuations. Furthermore, the charging effect of the system's large-capacity energy storage capacitor can generate significant inrush current, potentially burning out components such as power fuses and chips. In the detector programming process, after programming, a basic power-on test is required. After the test, operators directly plug and unplug the power cord to disconnect the detector. However, current and voltage remain on the power cord during this process, causing hot-swapping issues and potentially burning out the chips on the detector card, rendering the detector unusable. To address this issue, the inventors of this application have designed a power cord for detector programming and power-on testing that avoids circuit damage during programming, thereby reducing the risk of detector product scrap during manufacturing.

[0071] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0072] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components.

[0073] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0074] In the detailed description of the embodiments of this utility model, for ease of explanation, the schematic diagrams illustrating the device structure may be partially enlarged without adhering to the general scale, and the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. Furthermore, in actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0075] For ease of description, spatial relation terms such as “below,” “under,” “lower than,” “below,” “above,” and “upper” may be used herein to describe the relationship between one element or feature shown in the accompanying drawings and other elements or features. It will be understood that these spatial relation terms are intended to include directions other than those depicted in the drawings for devices in use or operation. Furthermore, when a layer is referred to as being “between” two layers, it may be the only layer between the two layers, or there may be one or more layers in between.

[0076] In the context of this application, the structure described above the first feature may include embodiments in which the first and second features are in direct contact, or embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0077] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0078] Please see Figure 1The diagram shows the structure of the power cord for detector programming and power-on testing according to this utility model. The power cord for detector programming and power-on testing includes: a switch box 1, a switch 3, a first power cord 8, a second power cord 9, a first plug 14, and a second plug 15. The switch box 1 has a first interface 17 and a second interface 18 on a pair of side walls. The first positive terminal and the second positive terminal are arranged opposite to each other, and the first negative terminal and the second negative terminal are arranged opposite to each other. The first power cord 8 passes through the first interface 17 and enters the switch box 1. The second power cord 9 passes through the second interface 18 and enters the switch box 1. The first plug 14 is connected to the end of the first power cord 8 away from the switch box 1, and the second plug 15 is connected to the end of the second power cord 9 away from the switch box 1.

[0079] For details, please refer to Figure 2 The diagram shows the structure of the switch box 1 after removing the box body in the power cord for detector programming and power-on testing of this utility model. The switch 3 includes a first positive terminal 303, a second positive terminal 304, a first negative terminal 305, and a second negative terminal 306. The first positive terminal 303 and the second positive terminal 304 are arranged opposite to each other, and the first negative terminal 305 and the second negative terminal 306 are arranged opposite to each other.

[0080] For details, please refer to Figure 3The diagram shows the structure of the power cord for detector programming and power-on testing of this utility model after removing the top cover and the switch 3. The power cord for detector programming and power-on testing also includes a first positive bolt 4, a second positive bolt 5, a first negative bolt 6, and a second negative bolt 7. The first positive bolt 4 is threaded to the first positive terminal 303, the second positive bolt 5 is threaded to the second positive terminal 304, the first negative bolt 6 is threaded to the first negative terminal 305, and the second negative bolt 7 is threaded to the second negative terminal 306. The first power line 8 passes through the first interface 17 and enters the switch box 1 (i.e., the box body 102 of the switch box 1). The second power line 9 passes through the second interface 18 and enters the switch box 1. The positive wire 10 of the first power line 8 is connected to the first positive bolt 4, the negative wire 11 of the first power line 8 is connected to the first negative bolt 6, the positive wire 12 of the second power line 9 is connected to the second positive bolt 5, and the negative wire 13 of the second power line 9 is connected to the second negative bolt 7. The first power line 8 and the second power line 9 can only be in a conductive state when the positive wire 10 and the negative wire 11 of the first power line 8 are connected to the positive wire 12 and the negative wire 13 of the second power line 9 through the switch 3. Otherwise, the first power line 8 and the second power line 9 are in a disconnected state.

[0081] Specifically, during use, the first plug 14 and the second plug 15 are connected to the external power supply and the detector respectively (or the first plug 14 and the second plug 15 are connected to the detector and the external power supply respectively). The switch 3 is turned on to connect the first power line 8 and the second power line 9. The detector's memory chip is identified and the programming step is performed. After the programming step is completed, the detector is powered on for testing. After the test is completed, the switch 3 is turned off first to disconnect the connection between the first power line 8 and the second power line 9. Then, the second plug 15 on the detector is unplugged (or the first plug 14 is unplugged). No current or voltage will be present on the second power line 9 (or the first power line 8), which can prevent damage to the chip on the detector's circuit board.

[0082] For example, please refer to [link / reference]. Figures 1 to 3 The switch box 1 includes an upper cover 101 and a box body 102. The upper cover 101 is connected to the box body 102 by fixing screws 2, and the upper cover 101 has a through hole.

[0083] For example, please refer to [link / reference]. Figure 2The switch 3 includes a switch rocker 301 and a cavity 302. The switch rocker 301 is hinged to the opening at the top of the cavity 302. The cavity 302 passes through the through hole and is connected to the upper cover 101.

[0084] As an example, the type of switch 3 can be a push-button switch, rocker switch, toggle switch, rotary switch or other suitable switch type. In this embodiment, a rocker switch is used.

[0085] As an example, the bottom of the cavity 302 is also provided with a cross-shaped partition plate 16. The first positive bolt 4, the second positive bolt 5, the first negative bolt 6 and the second negative bolt 7 are respectively located in different spaces separated by the partition plate 16, which is used to separate the first positive bolt 4, the second positive bolt 5, the first negative bolt 6 and the second negative bolt 7, so that the positive wire 10 of the first power line 8, the negative wire 11 of the first power line 8, the positive wire 12 of the second power line 9 and the negative wire 13 of the second power line 9 will not come into contact with each other, thus avoiding the malfunction of the switch 3.

[0086] As an example, the first interface 17 includes a threaded first threaded interface 1701 and a first threaded connector 1702. The first threaded interface 1701 is disposed on the outer wall of one side of the housing 102, and the first threaded connector 1702 is sleeved on the first power cord 8. The second interface 18 includes a threaded second threaded interface 1801 and a second threaded connector 1802. The second threaded interface 1801 is disposed on the outer wall of the other side of the housing 102, and the second threaded connector 1802 is sleeved on the second power cord 9. The first threaded connector 1702 is in close contact with the first power cord 8, and the second threaded connector 1802 is in close contact with the second power cord 9, preventing external dust and water droplets from entering the switch box 1 through the first interface 17 and the second interface 18, thereby extending the service life of the switch box 1.

[0087] As an example, one of the first plug 14 and the second plug 15 may be a female plug and the other a male plug. This can be determined according to specific circumstances, and no further restrictions are imposed here. Please refer to [link / reference needed]. Figure 4 The image shows a front view of the first plug 14 in the power cord for detector programming and power-on testing according to this invention. In this embodiment, the first plug 14 is a female plug. Please refer to [link / reference]. Figure 5 The image shows a front view of the second plug 15 in the power cord for detector programming and power-on testing according to this utility model. In this embodiment, the second plug 15 is a male plug.

[0088] For example, please refer to [link / reference]. Figure 4 The first plug 14 is provided with a positive contact 19 and a negative contact 20. The positive contact 19 is connected to the positive line 10 of the first power line 8, and the negative contact 20 is connected to the negative line 11 of the first power line 8.

[0089] Specifically, the number of positive contacts 19 of the first plug 14 is one or more, and the number of negative contacts 20 of the first plug 14 is one or more. In this embodiment, the first plug 14 has two positive contacts 19 and two negative contacts 20.

[0090] For example, please refer to [link / reference]. Figure 5 The second plug 15 is provided with a positive contact 21 and a negative contact 22. The positive contact 21 is connected to the positive line 12 of the second power line 9, and the negative contact 22 is connected to the negative line 13 of the second power line 9.

[0091] Specifically, the second plug 15 has one or more positive contacts 21 and one or more negative contacts 22. In this embodiment, the second plug 15 has two positive contacts 21 and two negative contacts 22.

[0092] For example, please refer to [link / reference]. Figure 2 It also includes a first positive U-nut 23, a second positive U-nut 24, a first negative U-nut 25, and a second negative U-nut 26. The first positive bolt 4 passes through the first positive terminal 303 and is connected to the first positive U-nut 23. The second positive bolt 5 passes through the second positive terminal 304 and is connected to the second positive U-nut 24. The first negative bolt 6 passes through the first negative terminal 305 and is connected to the first negative U-nut 25. The second negative bolt 7 passes through the second negative terminal 306 and is connected to the second negative U-nut 26, further fixing the first positive bolt 4, the second positive bolt 5, the first negative bolt 6, and the second negative bolt 7.

[0093] For example, please refer to Figure 6 The image shows a bottom view of the power cord for detector programming and power-on testing according to this utility model. The bottom surface of the switch box 1 is fixed with a mounting part 27, and the mounting part 27 is provided with mounting holes 28. The power cord for detector programming and power-on testing can be fixed in a convenient location through the mounting part 27.

[0094] In summary, the power cord for detector programming and power-on testing of this utility model includes a switch box, a switch, a first positive bolt, a second positive bolt, a first negative bolt, a second negative bolt, a first power cord, a second power cord, a first plug, and a second plug. The switch box has a first interface and a second interface on a pair of side walls. The switch includes a first positive terminal, a second positive terminal, a first negative terminal, and a second negative terminal. The first positive terminal and the second positive terminal are opposite each other, and the first negative terminal and the second negative terminal are opposite each other. The first positive bolt is threaded to the first positive terminal, and the second positive bolt is threaded to the second positive terminal. The negative terminal bolt is threaded to the first negative terminal, and the second negative terminal bolt is threaded to the second negative terminal. The first power cable enters the switch box through the first interface, and the second power cable enters the switch box through the second interface. The positive and negative terminals of the first and second power cables are electrically connected via the first and second positive terminal bolts, respectively. The positive and negative terminals of the second power cables are also electrically connected via the second positive and second negative terminal bolts. The first plug is connected to the end of the first power cable furthest from the box, and the second plug is connected to the end of the second power cable furthest from the box. This utility model's power cable for detector programming and power-on testing can prevent circuit damage during programming and reduce the risk of scrapping detector products during manufacturing. Therefore, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0095] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A power cord for detector programming and power-on testing, characterized in that, include: A switch box, wherein a pair of side walls of the switch box are provided with a first interface and a second interface; A switch is disposed in the switch box and includes a first positive terminal, a second positive terminal, a first negative terminal, and a second negative terminal. The first positive terminal and the second positive terminal are disposed opposite to each other, and the first negative terminal and the second negative terminal are disposed opposite to each other. A first positive electrode bolt and a second positive electrode bolt, wherein the first positive electrode bolt is threadedly connected to the first positive electrode terminal, and the second positive electrode bolt is threadedly connected to the second positive electrode terminal; The first negative electrode bolt and the second negative electrode bolt are threadedly connected to the first negative electrode terminal and the second negative electrode bolt is threadedly connected to the second negative electrode terminal. A first power line and a second power line, wherein the first power line passes through the first interface and enters the switch box, and the second power line passes through the second interface and enters the switch box, wherein the positive wire of the first power line is connected to the first positive bolt, the negative wire of the first power line is connected to the first negative bolt, the positive wire of the second power line is connected to the second positive bolt, and the negative wire of the second power line is connected to the second negative bolt. A first plug and a second plug, wherein the first plug is connected to the end of the first power cord away from the switch box, and the second plug is connected to the end of the second power cord away from the switch box.

2. The power cord for detector programming and power-on testing according to claim 1, characterized in that: The switch box includes a top cover and a box body. The top cover is connected to the box body by fixing screws, and the top cover has a through hole.

3. The power cord for detector programming and power-on testing according to claim 2, characterized in that: The switch includes a rocker switch and a cavity. The rocker switch is hinged to an opening at the top of the cavity, and the cavity passes through the through hole and is connected to the top cover.

4. The power cord for detector programming and power-on testing according to claim 3, characterized in that: The bottom of the cavity is also provided with a cross-shaped partition plate, and the first positive electrode bolt, the second positive electrode bolt, the first negative electrode bolt and the second negative electrode bolt are respectively located in different spaces separated by the partition plate.

5. The power cord for detector programming and power-on testing according to claim 2, characterized in that: The first interface includes a first threaded interface and a first threaded connector with threaded connection. The first threaded interface is disposed on the outer wall of one side of the housing, and the first threaded connector is sleeved on the first power line. The second interface includes a second threaded interface and a second threaded connector with threaded connection. The second threaded interface is disposed on the outer wall of the other side of the housing, and the second threaded connector is sleeved on the second power line.

6. The power cord for detector programming and power-on testing according to claim 2, characterized in that: The bottom surface of the box is fixed with a mounting component, and the mounting component is provided with mounting holes.

7. The power cord for detector programming and power-on testing according to claim 1, characterized in that: One of the first plug and the second plug is a female plug, and the other is a male plug.

8. The power cord for detector programming and power-on testing according to claim 1, characterized in that: The first plug has a positive contact and a negative contact. The positive contact is connected to the positive line of the first power line, and the negative contact is connected to the negative line of the first power line. The number of positive contacts and negative contacts of the first plug is one or more.

9. The power cord for detector programming and power-on testing according to claim 1, characterized in that: The second plug has a positive contact and a negative contact. The positive contact is connected to the positive line of the second power line, and the negative contact is connected to the negative line of the second power line. The number of positive contacts and negative contacts of the second plug is one or more.

10. The power cord for detector programming and power-on testing according to claim 1, characterized in that: It also includes a first positive U-nut, a second positive U-nut, a first negative U-nut, and a second negative U-nut. The first positive bolt passes through the first positive terminal and is connected to the first positive U-nut. The second positive bolt passes through the second positive terminal and is connected to the second positive U-nut. The first negative bolt passes through the first negative terminal and is connected to the first negative U-nut. The second negative bolt passes through the second negative terminal and is connected to the second negative U-nut.

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