WO2017063395A1 - 用于印刷电路板的信号测试装置 - Google Patents

用于印刷电路板的信号测试装置 Download PDF

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Publication number
WO2017063395A1
WO2017063395A1 PCT/CN2016/088804 CN2016088804W WO2017063395A1 WO 2017063395 A1 WO2017063395 A1 WO 2017063395A1 CN 2016088804 W CN2016088804 W CN 2016088804W WO 2017063395 A1 WO2017063395 A1 WO 2017063395A1
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Prior art keywords
switches
switch
printed circuit
circuit board
output terminals
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PCT/CN2016/088804
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English (en)
French (fr)
Inventor
海春喜
葛润聪
侯玲霄
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京东方科技集团股份有限公司
北京京东方显示技术有限公司
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Priority to US15/325,838 priority Critical patent/US10036772B2/en
Publication of WO2017063395A1 publication Critical patent/WO2017063395A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
    • G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
    • G01R31/2806—Apparatus therefor, e.g. test stations, drivers, analysers, conveyors
    • G01R31/2808—Holding, conveying or contacting devices, e.g. test adapters, edge connectors, extender boards
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays

Definitions

  • the present disclosure relates to the field of testing technology, and in particular to a signal testing device for a printed circuit board.
  • Figure 1 shows a printed circuit board (PCB) in a liquid crystal display (LCD).
  • PCB printed circuit board
  • LCD liquid crystal display
  • a signal testing apparatus for a printed circuit board comprising: a plurality of input terminals for receiving an external test signal; and a plurality of output terminals for supplying the printed circuit board An external test signal; a plurality of switches disposed between the plurality of input terminals and the plurality of output terminals for controllably coupling the plurality of input terminals to the plurality of output terminals; an ammeter, Means for measuring a current value on a first path provided by the coupling of the plurality of switches; and a voltmeter for measuring a voltage value on a second path provided by the coupling of the plurality of switches.
  • the plurality of switches may include a plurality of first switches, each of the plurality of first switches having one end connected to a respective one of the plurality of input terminals and connected to the The other end of the corresponding one of the plurality of output terminals.
  • the plurality of switches can include a second switch for selectively connecting one of the plurality of input terminals to a first end of the ammeter and for using the plurality of output terminals One of the third switches selectively coupled to the second end of the ammeter.
  • the second switch and the third switch can be configured to operate in such a manner that the plurality of input terminals are in one-to-one correspondence with the plurality of output terminals.
  • the plurality of first switches, the second switch, and the third switch may be configured such that when one of the plurality of first switches is turned off, the second switch and The third switch is turned on to couple an input terminal to which the open first switch is coupled to an output terminal to which the disconnected first switch is connected via the ammeter.
  • the plurality of first switches are configured such that only one of the plurality of first switches is turned off at any time.
  • the voltmeter has a first end and a second end for connection to a reference terminal on the printed circuit board.
  • the plurality of switches can include a fourth switch for selectively connecting one of the plurality of output terminals to the first end of the voltmeter.
  • the fourth switch may be configured to operate in synchronization with the second switch and the third switch such that the voltmeter when the current meter measures a current value on the first path The voltage value on the first path is measured.
  • the plurality of switches are selected from the group consisting of mechanical switches and electronic switches.
  • the plurality of switches are electronic switches
  • the signal testing device further includes a controller for controlling the electronic switches.
  • the controller is configured to control the electronic switch to act such that current and voltage on each of the paths from the plurality of input terminals to the plurality of output terminals are An ammeter and the voltmeter are measured.
  • the printed circuit board can be a printed circuit board of an LCD panel.
  • Figure 1 shows a printed circuit board in a liquid crystal display
  • FIG. 2 shows a schematic diagram of a signal testing device for a printed circuit board in accordance with an embodiment of the present disclosure
  • FIG. 3 illustrates a letter for a printed circuit board in accordance with another embodiment of the present disclosure.
  • the PCB In the PCB test process, the PCB is typically supplied with a set of test signals, which may be excitation signals that allow the PCB to function properly. Under excitation of the test signal, the PCB operates to present specific electrical characteristics (eg, current, voltage, etc.) at test points disposed thereon. By testing the electrical characteristic and comparing it to the target value, it can be determined whether the PCB has failed.
  • test signals which may be excitation signals that allow the PCB to function properly.
  • the PCB operates to present specific electrical characteristics (eg, current, voltage, etc.) at test points disposed thereon.
  • FIG. 2 shows a schematic diagram of a signal testing device 200 for a printed circuit board in accordance with an embodiment of the present disclosure.
  • the signal testing device 200 includes a plurality of input terminals in_1, in_2, in_3...in_n, a plurality of output terminals out_1, out_2, out_3...out_n, a plurality of switches K1, K2, K3, K4, The ammeter (indicated by “A” in the figure) and the voltmeter (indicated by "V” in the figure).
  • Input terminals in_1, in_2, in_3...in_n can be used to receive external test signals.
  • the output terminals out_1, out_2, out_3...out_n may be used to supply the external test signal to a printed circuit board (not shown) to be tested.
  • the switches K1, K2, K3, K4 are disposed between the input terminals in_1, in_2, in_3...in_n and the output terminals out_1, out_2, out_3...out_n. Under the control of these switches, the input terminals in_1, in_2, in_3...in_n are controllably coupled to the output terminals out_1, out_2, out_3...out_n.
  • An ammeter can be used to measure the current value on the first path provided by the coupling of the switches K1, K2, K3, K4.
  • a voltmeter can be used to measure the voltage value on the second path provided by the coupling of the switches K1, K2, K3, K4.
  • the first path may be the same as or different from the second path.
  • each of the plurality of first switches K1 has one end connected to a corresponding one of the plurality of input terminals in_1, in_2, in_3...in_n and connected to the plurality of output terminals out_1, The other end of the corresponding one of out_2, out_3...out_n.
  • the second switch K2 selectively connects one of the plurality of input terminals in_1, in_2, in_3...in_n to the first end of the ammeter.
  • the third switch K3 selectively connects one of the plurality of output terminals out_1, out_2, out_3...out_n to the second end of the ammeter.
  • the second switch K2 and the third switch K3 are configured to The mode action causes the plurality of input terminals in_1, in_2, in_3...in_n to be in one-to-one correspondence with the plurality of output terminals out_1, out_2, out_3, ..., out. For example, if the second switch K2 is switched to the input terminal in_1, the third switch K3 is switched to the output terminal out_1; if the second switch K2 is switched to the input terminal in_2, the third switch K3 is switched to the output terminal out_2, and so on.
  • the second switch K2 and the third switch K3 are turned on to couple the input terminal to which the disconnected first switch K1 is connected via an ammeter to An output terminal to which the disconnected first switch K1 is connected.
  • the second switch K2 and the third switch K3 are turned on to couple the input terminal in_1 to which the disconnected first switch K1 is connected via an ammeter to The output terminal out_1 to which the disconnected first switch K1 is connected.
  • the plurality of first switches K1, second switch K2, and third switch K3 cooperate to select a particular path for current measurement.
  • only one of the plurality of first switches K1 is turned off at any time.
  • the input terminal to which the disconnected K1 is connected is coupled to the corresponding output terminal via the ammeter via the second switch K2 and the third switch K3, so that the printed circuit board to be tested can still operate normally.
  • the fourth switch K4 can be used to selectively connect one of the output terminals out_1, out_2, out_3...out_n to the first end of the voltmeter, and the second end of the voltmeter can Connect to a reference terminal ref on the printed circuit board to be tested. Thereby, the voltmeter can measure the voltage value between the path selected by the fourth switch K4 and the reference terminal ref.
  • the reference terminal can be a ground terminal.
  • the fourth switch K4 can be configured to operate in synchronization with the second switch K2 and the third switch K3 (and potentially a corresponding first switch K1) such that the voltmeter measures the current value on a path when the ammeter is Measure the voltage value on the same path. Of course, this may not be the case in other embodiments.
  • the switches K1, K2, K3, K4 may be mechanical switches or electronic switches.
  • Examples of electronic switches include relays, analog switches, and the like.
  • each of the first switches K1 may be a simple single-pole single-throw (SPST) mechanical switch or an analog switch that implements an SPST function
  • the second switch K2 may be a single-pole multi-throw (SPMT) mechanical switch or implement SPMT function.
  • SPST simple single-pole single-throw
  • SPMT single-pole multi-throw
  • Analog multiplexer It can be controlled to be turned on or off by supplying a high level or a low level to the control terminal of the SPST analog switch, and can be passed to the mode
  • Each control terminal of the pseudo multiplexer provides an address code to select which channel will be turned "on".
  • the details of the electronic switch are known in the art and will not be described in detail herein.
  • FIG. 3 shows a schematic diagram of a signal testing device 300 for a printed circuit board in accordance with another embodiment of the present disclosure.
  • the switches K1, K2, K3, K4 are all electronic switches.
  • each of the plurality of first switches K1 can be implemented with an SPST analog switch
  • the second switch K2, the third switch K3, and the fourth switch K4 can each be implemented with an analog multiplexer.
  • the signal testing device 300 also includes a controller CTRL as compared to the signal testing device 200 shown in FIG.
  • the controller CTRL provides corresponding control signals to the electronic switches K1, K2, K3, K4 to control their actions.
  • Examples of the controller CTRL include embedded processors such as a microcontroller, a digital signal processor, and the like.
  • the controller CTRL can be programmed to control the switches K1, K2, K3, K4 to operate in the same manner as described in the previous embodiments. For example, when one of the plurality of first switches K1 is turned off, the second switch K2 and the third switch K3 are turned on to couple the input terminal to which the disconnected first switch K1 is connected to the disconnected via an ammeter. An output terminal to which the first switch K1 is connected. That is, the plurality of first switches K1 and the second switch K2 and the third switch K3 are controlled by the controller CTRL to cooperate to select a particular path for current measurement.
  • the fourth switch K4 can be controlled by the controller CTRL to operate in synchronization with the second switch K2 and the third switch K3 (and potentially a corresponding first switch K1) such that the voltmeter measures the current on a path at the ammeter The value of the voltage on the same path is measured simultaneously.
  • controller CTRL may control the switches K1, K2, K3, K4 to operate such that each of the paths from the input terminals in_1, in_2, in_3...in_n to the output terminals out_1, out_2, out_3...out_n
  • the current and voltage are measured by an ammeter and a voltmeter.
  • the measurements can be made on the various paths in a particular order (in the example of Figure 2, for example from top to bottom).
  • the measurement of each path can last for a predetermined period of time, for example to facilitate the operator to record the measured values.
  • the printed circuit board may be a printed circuit board in the LCD panel.
  • the external test signal may be a PG signal generated by a pattern generator.
  • the PG signals are supplied to the various interfaces on the printed circuit board by the signal testing devices 200, 300 described above to enable the LCD panel to function properly. Coupling by means of switches K1, K2, K3, K4 in signal testing devices 200, 300, on a printed circuit board
  • the electrical characteristics (eg, current, voltage, etc.) presented at each interface can be measured. The measured electrical characteristics can be compared to a target value to determine if the LCD panel has failed.
  • the printed circuit board in the LCD panel is exemplary and that the signal testing device 200, 300 can be adapted to test other printed circuit boards.

Abstract

一种用于印刷电路板的信号测试装置（200），包括：多个输入端子（in_1, in_2, in_3...in_n），用于接收外部测试信号；多个输出端子（out_1, out_2, out_3...out_n），用于向所述印刷电路板供应所述外部测试信号；多个开关（K1, K2, K3, K4），设置于所述多个输入端子（in_1, in_2, in_3...in_n）与所述多个输出端子（out_1, out_2, out_3...out_n）之间的路径上，用于可控地将所述多个输入端子（in_1, in_2,in_3...in_n）耦合到所述多个输出端子（out_1, out_2, out_3...out_n）；电流表，用于根据所述多个开关（K1, K2, K3, K4）的动作测量第一选定路径上的电流值；以及电压表，用于根据所述多个开关（K1, K2, K3, K4）的动作测量第二选定路径上的电压值。所述信号测试装置（200）能够简化测量过程，提高测量的自动化程度。

Description

用于印刷电路板的信号测试装置 技术领域
本公开涉及测试技术领域，具体来说涉及一种用于印刷电路板的信号测试装置。
背景技术
在电子产品(例如，显示面板)的调试或最终出厂检查中，诸如示波器之类的现有信号分析仪器的问题是操作复杂，导致无法满足生产需求。
图1示出了一种液晶显示器(LCD)中的印刷电路板(PCB)。该PCB上存在众多测试点。在最终出厂检查中，操作者必须通过找到所意图的测试点来一个一个地测量其电特性(例如，电流、电压等)。这是相当繁琐的。
因此，需要一种改进的用于印刷电路板的信号测试装置。
发明内容
有利的是，提供一种用于印刷电路板的信号测试装置，其可以简化测量过程，提高测量的自动化程度。
根据本公开的一个方面，提供了一种用于印刷电路板的信号测试装置，包括：多个输入端子，用于接收外部测试信号；多个输出端子，用于向所述印刷电路板供应所述外部测试信号；多个开关，设置于所述多个输入端子与所述多个输出端子之间，用于可控地将所述多个输入端子耦合到所述多个输出端子；电流表，用于测量由所述多个开关的所述耦合提供的第一路径上的电流值；以及电压表，用于测量由所述多个开关的所述耦合提供的第二路径上的电压值。
在一些实施例中，所述多个开关可以包括多个第一开关，所述多个第一开关中的每一个具有连接到所述多个输入端子中的相应一个的一端和连接到所述多个输出端子中的相应一个的另一端。
在一些实施例中，所述多个开关可以包括用于将所述多个输入端子之一选择性地连接到所述电流表的第一端的第二开关和用于将所述多个输出端子之一选择性地连接到所述电流表的第二端的第三开关。
在一些实施例中，所述第二开关和所述第三开关可以被配置为以这样的方式动作使得所述多个输入端子与所述多个输出端子一一对应。
在一些实施例中，所述多个第一开关、所述第二开关和所述第三开关可以被配置使得当所述多个第一开关中的一个断开时，所述第二开关和所述第三开关接通以将该断开的第一开关所连接的输入端子经由所述电流表耦合到该断开的第一开关所连接的输出端子。
在一些实施例中，所述多个第一开关被配置使得在任意时刻所述多个第一开关中仅一个被断开。
在一些实施例中，所述电压表具有第一端和第二端，所述第二端用于连接到所述印刷电路板上的一个参考端子。所述多个开关可以包括用于将所述多个输出端子之一选择性地连接到所述电压表的所述第一端的第四开关。
在一些实施例中，所述第四开关可以被配置成与所述第二开关和所述第三开关同步动作，使得所述电压表在所述电流表测量所述第一路径上的电流值时测量该第一路径上的电压值。
在一些实施例中，所述多个开关选自由机械开关和电子开关组成的组。
在一些实施例中，所述多个开关为电子开关，并且所述信号测试装置还包括用于控制所述电子开关的控制器。
在一些实施例中，所述控制器被配置成控制所述电子开关进行动作以使得从所述多个输入端子到所述多个输出端子的路径中的每一个上的电流和电压被所述电流表和所述电压表测量。
在一些实施例中，所述印刷电路板可以为LCD面板的印刷电路板。
根据在下文中所描述的附图和实施例，本公开的这些和其它方面将是清楚明白的，并且将参考在下文中所描述的实施例而被阐明。
附图说明
图1示出了一种液晶显示器中的印刷电路板；
图2示出了根据本公开的实施例的一种用于印刷电路板的信号测试装置的示意图；并且
图3示出了根据本公开的另一实施例的一种用于印刷电路板的信 号测试装置的示意图。
具体实施方式
以下结合附图对本公开的各实施例进行详细描述。
在PCB测试工序中，该PCB通常被供应一套测试信号，该测试信号可以是允许该PCB正常工作的激励信号。在测试信号的激励下，PCB进行操作以在设置于其上的测试点处呈现特定的电特性(例如，电流、电压等)。通过测试该电特性并将其与目标值进行比较，可以确定该PCB是否发生了故障。
图2示出了根据本公开的实施例的一种用于印刷电路板的信号测试装置200的示意图。
如图所示，该信号测试装置200包括多个输入端子in_1，in_2，in_3...in_n、多个输出端子out_1，out_2，out_3...out_n、多个开关K1，K2，K3，K4、电流表(图中用“A”表示)和电压表(图中用“V”表示)。
输入端子in_1，in_2，in_3...in_n可以用于接收外部测试信号。输出端子out_1，out_2，out_3...out_n可以用于向待测试的印刷电路板(未示出)供应所述外部测试信号。开关K1，K2，K3，K4设置于所述输入端子in_1，in_2，in_3...in_n与所述输出端子out_1，out_2，out_3...out_n之间。在这些开关的控制下，输入端子in_1，in_2，in_3...in_n被可控地耦合到输出端子out_1，out_2，out_3...out_n。电流表可以用于测量由所述开关K1，K2，K3，K4的耦合提供的第一路径上的电流值。电压表可以用于测量由所述开关K1，K2，K3，K4的耦合提供的第二路径上的电压值。第一路径可以与第二路径相同或不同。
在图2所示的示例中，多个第一开关K1中的每一个具有连接到多个输入端子in_1，in_2，in_3...in_n中的相应一个的一端和连接到多个输出端子out_1，out_2，out_3...out_n中的相应一个的另一端。第二开关K2将多个输入端子in_1，in_2，in_3...in_n之一选择性地连接到电流表的第一端。第三开关K3将多个输出端子out_1，out_2，out_3...out_n之一选择性地连接到电流表的第二端。
在一些实施例中，第二开关K2和第三开关K3被配置为以这样的 方式动作使得多个输入端子in_1，in_2，in_3...in_n与多个输出端子out_1，out_2，out_3...out_n之间一一对应。例如，如果第二开关K2切换到输入端子in_1，则第三开关K3切换到输出端子out_1；如果第二开关K2切换到输入端子in_2，则第三开关K3切换到输出端子out_2，依此类推。
在一些实施例中，当多个第一开关K1中的一个断开时，第二开关K2和第三开关K3接通以将该断开的第一开关K1所连接的输入端子经由电流表耦合到该断开的第一开关K1所连接的输出端子。在图2的示例中，由于最下面的第一开关K1断开，所以第二开关K2和第三开关K3接通以将该断开的第一开关K1所连接的输入端子in_1经由电流表耦合到该断开的第一开关K1所连接的输出端子out_1。换言之，多个第一开关K1、第二开关K2和第三开关K3相互配合以选择一条特定的路径进行电流测量。
在一些实施例中，在任意时刻多个第一开关K1中仅一个被断开。如前所述，该断开的K1所连接的输入端子借助于第二开关K2和第三开关K3经由电流表耦合到对应的输出端子，使得待测试的印刷电路板仍然可以正常工作。
在图2所示的示例中，第四开关K4可以用于将输出端子out_1，out_2，out_3...out_n之一选择性地连接到电压表的第一端，并且电压表的第二端可以连接到待测试的印刷电路板上的一个参考端子ref。由此，电压表可以测量由第四开关K4选定的路径与该参考端子ref之间的电压值。在一个实施例中，该参考端子可以是接地端子。特别地，第四开关K4可以被配置成与第二开关K2和第三开关K3(并且潜在地一个相应的第一开关K1)同步地动作，使得电压表在电流表测量一条路径上的电流值时测量该同一路径上的电压值。当然，在其他实施例中情况可以并非如此。
在实施例中，开关K1，K2，K3，K4可以为机械开关或电子开关。电子开关的示例包括继电器、模拟开关等。例如，第一开关K1中的每一个可以是简单的单刀单掷(SPST)机械开关或者实现SPST功能的模拟开关，并且第二开关K2可以是单刀多掷(SPMT)机械开关或者实现SPMT功能的模拟多路开关。可以通过向该SPST模拟开关的控制端子提供高电平或低电平来控制其接通或断开，并且可以通过向该模 拟多路开关的各控制端子提供一个地址码来选择哪一个通道将被接通。电子开关的细节是本领域已知的，并且在此将不进行详细描述。
图3示出了根据本公开的另一实施例的一种用于印刷电路板的信号测试装置300的示意图。在该实施例中，开关K1，K2，K3，K4全部为电子开关。例如，多个第一开关K1中的每一个可以用SPST模拟开关实现，而第二开关K2、第三开关K3和第四开关K4每个都可以用模拟多路开关实现。
与图2所示的信号测试装置200相比，信号测试装置300还包括控制器CTRL。该控制器CTRL向电子开关K1，K2，K3，K4提供相应的控制信号以控制其动作。控制器CTRL的示例包括单片机、数字信号处理器等嵌入式处理器。
控制器CTRL可以被编程以控制开关K1，K2，K3，K4按照前面实施例中描述的相同方式进行动作。例如，当多个第一开关K1中的一个断开时，第二开关K2和第三开关K3接通以将该断开的第一开关K1所连接的输入端子经由电流表耦合到该断开的第一开关K1所连接的输出端子。也即，多个第一开关K1与第二开关K2和第三开关K3被控制器CTRL控制来相互配合以选择一条特定的路径进行电流测量。另外，第四开关K4可以被控制器CTRL控制来与第二开关K2和第三开关K3(并且潜在地一个相应的第一开关K1)同步地动作，使得电压表在电流表测量一条路径上的电流值的同时测量该同一路径上的电压值。
进一步地，控制器CTRL可以控制开关K1，K2，K3，K4进行动作以使得从输入端子in_1，in_2，in_3...in_n到输出端子out_1，out_2，out_3...out_n的路径中的每一个上的电流和电压被电流表和电压表测量。测量可以以特定的顺序(在图2的示例中，例如以从上到下)在各条路径上进行。对每条路径的测量可以持续预定的时间段，例如以方便操作者记录测量值。
在前面的描述中，印刷电路板可以为LCD面板中的印刷电路板。在这种情况下，外部测试信号可以是图案生成器(Pattern Generator)生成的PG信号。PG信号由前面描述的信号测试装置200、300供应给印刷电路板上的各接口，以使得LCD面板能够正常工作。借助于信号测试装置200、300中的开关K1，K2，K3，K4的耦合，印刷电路板上 的各接口处呈现的电特性(例如，电流、电压等)可以被测量。所测得的电特性可以与目标值进行比较，以便确定该LCD面板是否发生了故障。将理解的是，LCD面板中的印刷电路板是示例性的，并且信号测试装置200、300可以适用于对其他印刷电路板进行测试。
鉴于前面的描述并结合阅读附图，对前述本公开的示例性实施例的各种修改和改动对于相关领域的技术人员可以变得显而易见。任何和所有修改仍将落入本公开的非限制性和示例性实施例的范围内。此外，属于本公开的这些实施例所属领域的技术人员，在得益于前面的描述和相关附图所给出的教导后，将会想到在此描述的本公开的其他实施例。
因此，应当理解，本公开的实施例并不限于所公开的特定实施例，并且修改和其他的实施例也意图被包含在所附权利要求书的范围内。尽管此处使用了特定术语，但是它们仅在通用和描述性意义上使用，而非为了限制的目的。

Claims (12)

  1. 一种用于印刷电路板的信号测试装置，包括：
    多个输入端子，用于接收外部测试信号；
    多个输出端子，用于向所述印刷电路板供应所述外部测试信号；
    多个开关，设置于所述多个输入端子与所述多个输出端子之间，用于可控地将所述多个输入端子耦合到所述多个输出端子；
    电流表，用于测量由所述多个开关的所述耦合提供的第一路径上的电流值；以及
    电压表，用于测量由所述多个开关的所述耦合提供的第二路径上的电压值。
  2. 根据权利要求1所述的装置，其中所述多个开关包括多个第一开关，所述多个第一开关中的每一个具有连接到所述多个输入端子中的相应一个的一端和连接到所述多个输出端子中的相应一个的另一端。
  3. 根据权利要求2所述的装置，其中所述多个开关包括用于将所述多个输入端子之一选择性地连接到所述电流表的第一端的第二开关和用于将所述多个输出端子之一选择性地连接到所述电流表的第二端的第三开关。
  4. 根据权利要求3所述的装置，其中所述第二开关和所述第三开关被配置为以这样的方式动作使得所述多个输入端子与所述多个输出端子一一对应。
  5. 根据权利要求4所述的装置，其中所述多个第一开关、所述第二开关和所述第三开关被配置使得当所述多个第一开关中的一个断开时，所述第二开关和所述第三开关接通以将该断开的第一开关所连接的输入端子经由所述电流表耦合到该断开的第一开关所连接的输出端子。
  6. 根据权利要求5所述的装置，其中所述多个第一开关被配置使得在任意时刻所述多个第一开关中仅一个被断开。
  7. 根据权利要求3所述的装置，其中所述电压表具有第一端和第二端，所述第二端用于连接到所述印刷电路板上的一个参考端子，并且其中所述多个开关包括用于将所述多个输出端子之一选择性地连接 到所述电压表的所述第一端的第四开关。
  8. 根据权利要求7所述的装置，其中所述第四开关被配置成与所述第二开关和所述第三开关同步动作，使得所述电压表在所述电流表测量所述第一路径上的电流值时测量该第一路径上的电压值。
  9. 根据权利要求1所述的装置，其中所述多个开关选自由机械开关和电子开关组成的组。
  10. 根据权利要求9所述的装置，其中所述多个开关为电子开关，并且其中所述信号测试装置还包括用于控制所述电子开关的控制器。
  11. 根据权利要求10所述的装置，其中所述控制器被配置成控制所述电子开关进行动作以使得从所述多个输入端子到所述多个输出端子的路径中的每一个上的电流和电压被所述电流表和所述电压表测量。
  12. 根据权利要求1所述的装置，其中所述印刷电路板为LCD面板的印刷电路板。
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