Modular high resistance measurement system

Abstract

This utility model relates to the technical field of resistance measurement systems, specifically a modular high-resistance measurement system. It includes a control terminal, a network switch, several measurement modules, and an environmental chamber control module. The measurement modules are independent and can simultaneously measure the resistance of different samples. Both the measurement modules and the environmental chamber control module are connected to the control terminal via the network switch. Each measurement module has several measurement channels CH, which are used to monitor the current and voltage of that channel. The measurement modules and measurement channels CH can be freely superimposed and arbitrarily combined. This utility model uses a voltmeter V and an ammeter A on each measurement channel CH to measure the voltage across the sample R and the current flowing through the measurement channel CH in real time. By selecting either a 1MΩ current-limiting resistor contact or a 0.1MΩ current-limiting resistor contact on the selector switch K, different voltages in the measurement channels CH can be accommodated, resulting in a wider measurement range and more accurate measurement results.

Description

Technical Field

[0001] This utility model relates to the field of resistance measurement system technology, and in particular to a modular high-resistance measurement system. Background Technology

[0002] The traces (also called wires or traces) on a PCB (Printed Circuit Board) are conductive paths formed on a copper-clad board through an etching process. They are used to connect the pins of electronic components and transmit electrical signals and power. Their core function is to provide a low-impedance path for current and signals, ensuring the normal operation of the circuit.

[0003] With the development of technology, electronic products are becoming more advanced, leading to higher line density and smaller line spacing on PCBs used in these products. Smaller spacing and higher density make ion migration more likely. Insulation resistance testing equipment used to assess PCB reliability can measure the degree of this insulation degradation, typically using a multiplexer to perform the measurement through scanning.

[0004] In traditional multi-channel scanning tests, sample migration during the scanning interval cannot be detected and can only be measured in the next scanning cycle. Partial migration may only occur briefly, lasting a few minutes, and may therefore go undetected, causing test results to deviate from the true value. Commercially available insulation resistance testing equipment typically has a measurement range of only 1*102. 5 Up to 1*10 12 It cannot measure resistances with lower or higher values; moreover, it cannot measure the true voltage across the sample being tested, making it impossible to know the true voltage across the sample; it also cannot measure resistances across the entire range in real time, as it is usually done by scanning, which is slow; and currently, to evaluate PCB reliability with high precision and high resistance, it relies on instruments from the United States or Japan, which carries high unknown risks. Utility Model Content

[0005] The main objective of this invention is to provide a modular high-resistivity measurement system to solve the problems raised in related technologies.

[0006] To achieve the above objectives, according to one aspect of this utility model, a modular high-resistance measurement system is provided, including a control terminal, a network switch, and several measurement modules and an environmental chamber control module. The several measurement modules are independent of each other and can simultaneously measure the resistance of different samples. The measurement modules and the environmental chamber control module are both connected to the control terminal through the network switch. Each measurement module is provided with several measurement channels CH, which are used to monitor the current and voltage of the channel. The measurement modules and measurement channels CH can be freely superimposed and arbitrarily combined.

[0007] Furthermore, several measurement channels CH within each measurement module are connected in parallel across the two ends of the power supply E, and the measurement channels CH have the same structure.

[0008] Furthermore, the measurement channel CH includes a selection resistor switch K, a voltmeter V, an ammeter A, and the sample R to be measured.

[0009] Furthermore, the ammeter A is connected in series with the sample R to be measured, and then in parallel with the voltmeter V. The selection resistor switch K is connected to the positive terminal of the power supply E. The ammeter is used to monitor the current in the measurement channel CH in real time.

[0010] Furthermore, the voltmeter V is connected in series with the selection resistor switch K, the positive terminal of the voltmeter V is connected to the selection resistor switch K, the voltmeter V is used to measure the voltage applied across the sample R in real time, and the negative terminal is connected to the negative terminal of the power supply E.

[0011] Furthermore, the selector resistor switch K includes a 1M current-limiting resistor contact and a 0.1M current-limiting resistor contact.

[0012] Furthermore, the power supply E is a programmable power supply with a voltage range of 0~5KV, used to apply a bias voltage to the sample R under test, and the negative terminal of the power supply E is grounded.

[0013] Furthermore, the control terminal is an industrial control computer or a server.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This invention uses a voltmeter V and an ammeter A on each measurement channel CH to measure the voltage across the sample R and the current flowing through the measurement channel CH in real time. By selecting either a 1MΩ or 0.1MΩ current-limiting resistor contact on the selector switch K, it can adapt to different voltages in the measurement channel CH, resulting in a wider measurement range and more accurate measurement results. The modular design allows for more flexible assembly options. Real-time voltage and current detection can more accurately detect subtle defects in PCB circuitry, thus promoting the reliable development of high-precision electronic products. Attached Figure Description

[0016] Figure 1 This is the electrical block diagram of the entire machine of this utility model;

[0017] Figure 2 This is the circuit diagram of the measurement module of this utility model;

[0018] Figure 3 This is the circuit diagram of the measurement channel of this utility model. Detailed Implementation

[0019] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0020] This embodiment provides a modular high-resistance measurement system, such as Figure 1 As shown, the system includes a control terminal, a network switch, 16 measurement modules, and an environmental chamber control module. The 16 measurement modules are independent and can simultaneously measure the resistance R of different samples. Both the measurement modules and the environmental chamber control module are connected to the control terminal via the network switch. Figure 2 As shown, the measurement module has 16 measurement channels CH. The measurement channels CH are used to monitor the current and voltage of the channel. The measurement module and the measurement channels CH can be freely superimposed and arbitrarily combined.

[0021] like Figure 2 As shown, several measurement channels CH in each measurement module are connected in parallel across the two ends of the power supply E, and the measurement channels CH have the same structure.

[0022] like Figure 3 As shown, the measurement channel CH includes a selection resistor switch K, a voltmeter V, an ammeter A, and the sample R to be measured.

[0023] Ammeter A is connected in series with the sample R to be measured, and then in parallel with voltmeter V. The selector switch K is connected to the positive terminal of the power supply E. Ammeter A is used to monitor the current in the measurement channel CH in real time.

[0024] The voltmeter V is connected in series with the selector switch K. The positive terminal of the voltmeter V is connected to the selector switch K. The voltmeter V is used to measure the voltage applied across the sample R in real time. The negative terminal is connected to the negative terminal of the power supply E.

[0025] The selector resistor switch K includes a 1M current-limiting resistor contact and a 0.1M current-limiting resistor contact.

[0026] The positive output of power supply E controls the connection of two resistor loops to the current-limiting resistor in the measurement channel CH circuit via switches. When the voltage in the measurement channel CH circuit is low, the 0.1M current-limiting resistor contact of the selection resistor switch K is activated; when the voltage in the measurement channel CH circuit is high, the 1M current-limiting resistor contact of the selection resistor switch K is activated, thus achieving a wider resistance measurement range, capable of measuring down to 1*10. 3 Up to 1*10 14 The resistance value of ohms greatly expands the measurement range of the equipment.

[0027] The power supply E is a programmable power supply with a voltage range of 0~5KV, used to apply a bias voltage to the sample R under test. The negative terminal of the power supply E is grounded.

[0028] The control terminal is an industrial control computer or server.

[0029] Each measurement module communicates with a network switch via a LAN interface, and the data measured by the measurement module can be transmitted to the industrial control computer or server at the control end through the network switch.

[0030] The environmental chamber control module is used to control and adjust environmental parameters such as temperature and humidity of the environmental chamber. The environmental chamber control module also communicates with the network switch through the local area network (LAN) interface. It transmits the environmental parameters such as temperature and humidity of the environmental chamber measured by the environmental chamber control module to the industrial control computer or server at the control end through the network switch, and receives instructions and feedback status from the control end.

[0031] Sixteen measurement modules and an environmental control module constitute a distributed measurement and environmental control network system architecture.

[0032] The network switch uses Huawei S5700 series switches, which are gigabit / 10-gigabit Ethernet switches with high performance, high reliability and flexible expansion capabilities. This series of switches has 24 / 48 gigabit Ethernet ports, which can connect multiple measurement modules at the same time.

[0033] Ammeter A employs a self-developed micro-current measurement module, which boasts femtoampere-level measurement resolution and high accuracy. Alternatively, a Keithley 6514 electrometer can be used to accurately measure the real-time current of each measurement channel (CH circuit).

[0034] Voltmeter B employs a self-developed voltage measurement module, which can accurately measure output voltages from 0-5KV with a measurement accuracy of 0.1%. Alternatively, it can use a data acquisition system such as the Keithley 2700. It can accurately measure the voltage across the sample R on each measurement channel CH circuit in real time.

[0035] An ammeter A is designed on each measurement channel CH, which can monitor the current on each measurement channel CH in real time; at the same time, a voltmeter B is also designed on each measurement channel CH, which can monitor the voltage across the sample R being measured on each measurement channel CH in real time; each measurement channel CH has an independent ammeter A and an independent voltmeter B, ensuring that each measurement channel CH is under real-time monitoring, and can quickly capture the real-time data obtained from measuring the sample R being measured.

[0036] This embodiment preferably uses 16 measurement modules, but other numbers of measurement modules are also possible; each measurement module has 16 measurement channels (CH), or other numbers of measurement channels (CH). The 16 measurement channels (CH) of the 16 measurement modules can be freely stacked to achieve any combination of 16 to 1024 measurement channels (CH).

[0037] The measurement channel CH contains a 0~5KV programmable power supply E, 16 voltage measurement channels, 16 current measurement channels, and 16 sets of selector resistor switches K. The positive terminal of the power supply E is connected to the current-limiting resistor of the selector resistor switch K. The external sample R is connected to the internal ammeter A. The negative terminal of the ammeter A returns to the negative terminal of the power supply E. At the same time, the voltmeter B is connected across the sheath between the sample R and the negative terminal of the power supply E.

[0038] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A modular high-resistance measurement system, comprising a control terminal and a network switch, characterized in that, It also includes several measurement modules and an environmental chamber control module. The measurement modules are independent of each other and simultaneously measure the resistance of different samples. Both the measurement modules and the environmental chamber control module are connected to the control terminal through a network switch. Each measurement module has several measurement channels CH, which are used to monitor the current and voltage of the channel.

2. The modular high-resistivity measurement system according to claim 1, characterized in that, Several measurement channels CH within each measurement module are connected in parallel across the two ends of the power supply E, and the measurement channels CH have the same structure.

3. The modular high-resistivity measurement system according to claim 2, characterized in that, The measurement channel CH includes a selection resistor switch K, a voltmeter V, an ammeter A, and the sample R to be measured.

4. The modular high-resistivity measurement system according to claim 3, characterized in that, The ammeter A is connected in series with the sample R to be measured, and then in parallel with the voltmeter V. The selection resistor switch K is connected to the positive terminal of the power supply E. The ammeter is used to monitor the current in the measurement channel CH in real time.

5. The modular high-resistivity measurement system according to claim 3, characterized in that, The voltmeter V is connected in series with the selector switch K. The positive terminal of the voltmeter V is connected to the selector switch K. The voltmeter V is used to measure the voltage applied across the sample R in real time, and the negative terminal is connected to the negative terminal of the power supply E.

6. The modular high-resistivity measurement system according to claim 3, characterized in that, The selector resistor switch K includes a 1M current-limiting resistor contact and a 0.1M current-limiting resistor contact.

7. The modular high-resistivity measurement system according to claim 2, characterized in that, The power supply E is a programmable power supply with a voltage range of 0~5KV, used to apply a bias voltage to the sample R under test, and the negative terminal of the power supply E is grounded.

8. The modular high-resistivity measurement system according to claim 1, characterized in that, The control terminal is an industrial control computer or a server.

Images