KR19980056346A - Circuit function test system using personal computer - Google Patents

Abstract

The present invention relates to a circuit function inspection system using a personal computer to improve the work efficiency by reducing the work space by integrally configuring a device for inspecting signal processing circuit boards used in a VTR, TV, etc. using a personal computer. The measurement circuit board is located and after applying the reference signal and power to the circuit under test, the manual jig which outputs the output signal of the circuit under test and the measurement signal from each test point to the PC and the control box, and from the PC A control box for amplifying a measurement signal input from the manual jig according to a control command and applying it to a PC, and applying a button selection signal to the manual jig, a control device for controlling the operation of the external control box and the internal devices; In accordance with the control signal from the controller, the digital TV signal from the TV receiver and from the A / D converter A graphic receiver for synthesizing the measured signals and outputting them on the monitor, and a TV receiver and video trigger device or level for digitally processing the A / V signal or the high frequency signal, which is the output signal of the circuit under test, which is output from the manual jig. An A / D conversion device which operates according to a trigger of a trigger device and converts a measurement signal input from the control box into a digital signal and applies a predetermined trigger signal to the A / D conversion device according to a control signal from the control device. And a video trigger device for triggering a special waveform such as a video signal, and a level trigger device for triggering a waveform of a general signal by applying a trigger signal to the A / D conversion device according to a control signal from the control device. DIO device in charge of data input / output between the external control box and the processing and processing by the control device A PC comprising a storage device for storing the result of the processing and a monitor in which the test pattern caused by the operation of the circuit to be measured and the measurement waveform detected at a predetermined test point are displayed in accordance with an input signal from the graphic device of the PC.

Description

Circuit function test system using personal computer

The present invention relates to a circuit function inspection system for measuring the output waveform of the circuit board under test and to check whether the circuit is operating normally. More specifically, a device for inspecting a signal processing circuit board used in a VTR or a TV is provided. The present invention relates to a circuit function inspection system using a personal computer that intends to increase the work efficiency by reducing the work space by constructing an integrated structure using the integrated circuit.

In general, the process of producing a circuit board for processing video and audio signals can be largely divided into three types: first, mounting the component on the circuit board as a component mounter; and second, mounting the component on the circuit board. A process of inspecting the back surface of the circuit board with a component inspector, and a process of inspecting and adjusting a signal output to the circuit board on which the back surface inspection is completed by an inspector.

The present invention relates to an inspection apparatus used in the third step, wherein the circuit to be inspected is a substrate for processing audio and video contained in a video tape recorder (VTR), a video camera and a television (TV), and the like. By inputting a reference signal and inspecting the output signal after the input signal is processed, it is possible to prepare a cause diagnosis and a countermeasure for the case where the video signal is not clean or the video signal is distorted. For example, a circuit board outputs a plurality of signals such as a video signal, a luminance signal, a chroma signal, and an audio signal to a plurality of test points, and selects a signal to be inspected from among the output signals. Inspect it and adjust to the corresponding adjustment volume with the standard value.

The configuration of a conventional circuit function inspection system is shown in FIG. 1, and the circuit function inspection system shown in FIG. 1 is provided with the circuit board 10 under test at a measurement position on the manual jig 1 and provided at the manual jig 1. After inputting the reference signal to the circuit board 10 under test by operating the checked test adjustment button 111, the output signal after being processed on the circuit board 10 is transmitted to the TV set 15, the frequency counter 12, and the like. It is output simultaneously to a plurality of oscilloscopes 13 and 14. That is, the image of the output signal is displayed on the TV set 15, measured by the frequency counter 12, and displayed as waveforms by the oscilloscopes 13 and 14. The operator adjusts the circuit board 10 by comprehensively determining the measurement results of the plurality of measuring instruments.

However, the conventional circuit function inspection system, as shown in Figure 1, because the use of a large number of instruments, that is, a variety of expensive instruments, such as a plurality of oscilloscopes and frequency counters, the cost is increased, and between the instruments and the manual jig There was a problem that the system installation space is increased because the wiring is complicated for the connection.

In addition, there is a problem in that the probability of distortion of the measured signal during transmission is increased by using a plurality of measuring instruments, and the operator's working radius is increased because the operator has to make a comprehensive judgment based on the measurement results displayed on the measuring instruments and TV sets. There was a problem that is wider and it is difficult for the operator to check the test results at a glance.

The present invention has been made to solve the above-mentioned problems, the object of which is to simplify the external structure by integrating a plurality of measuring instrument functions in a personal computer using a personal computer to reduce the work space and increase the work efficiency It is to provide a circuit function test system using a personal computer.

1 is a configuration diagram showing the structure of a conventional circuit function inspection system.

2 is a block diagram showing the configuration of a circuit function inspection system according to the present invention.

* Explanation of symbols for main parts of the drawings

21: PC main body 22: monitor 23: manual jig

24: control box 25: keyboard 211: control device

212: Graphics device 213: TV receiver 214: A / D converter

215: Video trigger device 216: DIO device 217: Level trigger device

218: HDD 219: FDD

The present invention is a technical means for achieving the above object, in the circuit function inspection system, the circuit under test is located, and the output signal of the circuit under test after applying the reference signal and power to the circuit under test And a manual jig for outputting measurement signals from each test point to a PC and a control box, and amplifying the measurement signal input from the manual jig according to a control command from the PC and applying it to the PC and selecting a button with the manual jig. A control box for applying a signal, an external control box, and a control device for controlling each of the internal devices to display the output waveform of the circuit board and its test pattern on the monitor and to measure the frequency of the output waveform; Therefore, the digital TV signal from the TV receiver and the measured signal from the A / D converter are synthesized and output on the monitor. The A / V signal or high frequency signal, which is the output signal of the graphic device and the circuit board to be output from the manual jig, is processed according to a trigger of a TV receiver, a video trigger device, or a level trigger device. An A / D converter for converting a measurement signal input from a box into a digital signal, and applying a predetermined trigger signal to the A / D converter according to a control signal from the controller, and triggers a special waveform such as a video signal. By applying a trigger signal to the A / D conversion device according to the video trigger device and the control signal from the control device, a level trigger device that triggers a waveform of a general signal and data input / output between the control device and an external control box It is composed of a memory device that stores the processing and processing results by the DIO device and the control device. It depends as with a PC, and a test pattern and monitors, as the measured waveform detected at a given test point according to the measured operation of the circuit substrate in accordance with an input signal from the graphics unit of the PC.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the present invention.

First, referring to Figure 2 showing the configuration of the circuit function test system according to the present invention, the circuit function test system according to the present invention, each device measures the frequency of the output signal of the circuit board under measurement through the ISA bus, the waveform and The control device 211 for controlling the test pattern to appear on the monitor 22 and the waveforms of the video signal and the measurement signal from the TV receiver 213 through the ISA bus appear under the control of the control device 211. TV receiver 213 for digital signal processing so that the A / V signal (ie, audio / video signal) or RF signal inputted from the graphics device 212 and the manual jig 23 can be recognized in a computer. And the A / D converter 214 and the control device 211 which operate according to the trigger of the level trigger device 217 or the video trigger device 215 to convert the measurement signal input from the control box 24 into a digital signal. )from According to the control, when the input signal of the A / D converter 214 is a video signal, the video trigger device 215 which triggers the A / D converter and the data input / output between the controller 211 and the external control box 24 are controlled. A level trigger that triggers the A / D converter 214 when the input signal of the A / D converter 214 is a general waveform according to the control from the DIO device 216 and the control device 211. PC main body 21 comprising a main memory device (HDD) 218 and an auxiliary memory device (FDD) 219 for storing data according to the processing process and the processing result by the device 217 and the control device 211; And a monitor 22 showing an image of a reference signal processed by the circuit board under measurement by the graphic device 212 and an output waveform of the circuit board under measurement, and a circuit board under test. An adjustment button and a reference signal applied to the circuit board under test A / V signal or RF signal, which is an output signal from the circuit under test according to the reference signal application, is applied to the PC main body 21, and the measurement signal from each test point is applied to the control box 24. Controls the jig 23 and the control signal applied from the DIO device 216 to amplify and apply the measured signal extracted from the circuit board by the manual jig 23 to the PC main body 21. A box 24 and a keyboard 25 which is an input device for allowing an operator to input a control command to the control device 211 of the PC main body 21 are provided.

The equalization by the above-mentioned structure is performed as follows.

When the circuit to be inspected (not shown) is placed at the test position on the manual jig 23, the upper fixture (not shown) and the lower fixture (not shown) of the manual jig 23 are driven down / up to drive the circuit to be inspected (not shown). And a plurality of test pins provided on the lower fixture are in contact with a predetermined point on the substrate.

In this state, the operator operates the inspection and adjustment buttons (not shown) provided on the manual jig 23 to apply a reference signal and power to the circuit board. The manual jig 23 operates not only in accordance with the signals from the provided inspection and adjustment buttons, but also in response to a button selection signal applied from the control box 24. The button selection signal applied from the control box 24 to the manual jig 23 is a control signal from the control device 211 input through the DI0 device 216.

That is, the circuit function inspection system according to the present invention can operate the manual jig 23 by inputting an operation command to the keyboard 25 of the PC as well as the inspection and adjustment buttons on the jig 23.

Accordingly, the output signal of the circuit board and the measurement signal measured through the plurality of test pins provided in the lower fixture are transmitted to the TV receiver 213 and the control box 24 of the PC main body 21, respectively.

Accordingly, the TV receiving apparatus 213 performs digital signal processing so that the A / V signal (ie, video / audio signal or high frequency (RF) signal) input from the passive jig 23 can be recognized inside the PC main body 21. To the graphics device 212.

In addition, the control box 24 amplifies the measurement signal according to the control signal from the control device 211 input through the DIO device 216 of the measurement signal input from the manual jig 23 A / D conversion device ( 214). The A / D converter 214 operates according to a trigger from the video trigger device 215 or the level trigger device 217 to convert the measurement signal input from the control box 24 into a digital signal.

The video trigger device 215 triggers the A / D converter 214 according to a control command from the control device 211, which is configured to trigger a video signal of a high frequency band. In addition, the level trigger device 217 triggers the A / D conversion device 214 according to a control command from the control device 211, which has a trigger function of a general waveform as in a general oscilloscope.

As described above, the measurement signal converted into the digital signal by the A / D converter 214 and the digital TV signal output from the TV receiver 213 are controlled by the control unit 211. Is entered.

The graphic device 212 synthesizes the digital TV signal and the measurement signal, processes the graphic signal, and applies the graphic signal to the monitor 22, whereby a circuit board under test is applied from the manual jig 23 on the monitor 22. The measurement waveform appears along with the test pattern obtained by processing the signal.

For example, a test pattern may appear on the entire screen of the monitor 22, and a waveform of the measurement signal may appear on a portion of the screen at a predetermined size (i.e., smaller than the full screen), or half the screen of the monitor 22 may be displayed. The test pattern may appear on one side and the waveform of the measurement signal may appear on the other side.

This depends on various applications and modifications of the invention.

As described above, by looking at the test pattern and the measurement waveform displayed on the monitor 22, the operator judges whether the adjustment is made and operates an adjustment button on the manual jig 23 or the keyboard 25 to give an adjustment command.

As described above, the present invention has the effect of simplifying the structure, simplifying the wiring, and reducing the work space by providing a plurality of measuring device functions in the personal computer. Also, the test pattern and the waveform of the measured signal by the output signal from the circuit board under measurement are reduced. Simultaneous display on the monitor screen allows the operator to inspect and adjust at once and reduce the working range of the operator, thereby improving work efficiency.

Claims (1)

In the circuit function inspection system, a circuit under test is located and the output signal of the circuit under test and the measurement signal from each test point are output to the PC and the control box after the reference signal and the power are applied to the circuit under test. A control box for amplifying a manual jig, a measurement signal input from the manual jig according to a control command from a PC, and applying it to a PC, and applying a button selection signal to the manual jig, an external control box, and internal devices A control device for displaying the output waveform of the circuit board and its test pattern on a monitor and measuring the frequency of the output waveform, and from the digital TV signal and the A / D conversion device from the TV receiving device according to the control signal from the control device. Of the graphics device for synthesizing the measured signals and outputting them on the monitor and the circuit board under measurement from the manual jig. A / V signal or A / V signal or high frequency signal, which is output signal, is processed by digital signal receiver and video trigger device or level trigger device triggers and converts measured signal inputted from the control box into digital signal. A video trigger device which applies a predetermined trigger signal to the A / D converter according to the control signal of the D conversion device and the control device computer and triggers a special waveform such as a video signal, and the control signal from the control device. By applying the trigger signal to the A / D conversion device, the level trigger device that triggers the waveform of the general signal, the DIO device responsible for data input / output between the control device and the external control box, and the processing and processing results by the control device A circuit to be measured according to an input signal from a personal computer (PC) comprising a memory device to be stored; Test patterns and circuit function test system using a personal computer characterized in that it includes a monitor may appear the measured waveform detected at a given test point according to the behavior of the plate.