KR100190667B1 - Circuit capability test system using pc - 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 an external control box and each of 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 that is in charge of data input and output between the external control box and the processing by the control device and And a frost and PC made of a storage device for storing the result of a test pattern according to the operation of the measuring circuit board according to an input signal from the graphics unit of the PC, and monitors, as the measured waveform detected at a given test point.

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 process, wherein the circuit to be inspected is a substrate for processing audio and video contained in a video tape recorder (VTR), a video camera, a television (TV), and the like. By inputting the reference signal and processing the input signal, the signal is inspected, and thus, 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 the conventional circuit functional inspection system is shown in FIG. 1, and the circuit functional inspection system shown in FIG. 1 places the circuit board under test 10 in a measurement position on the manual jig 1, and the manual jig 1 After inputting the reference signal to the circuit board 10 to be inspected by operating the inspection adjustment button 111 provided in the circuit board 10, the output signal after being processed on the circuit board 10 is transmitted to the TV set 15 and the frequency counter 12. And multiple oscilloscopes 13 and 14 at the same time. 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 functional 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, frequency counters, etc., the cost increases, and the instrument and the manual jig There is a problem that the system installation space is increased because the wiring is complicated for the connection with the.

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 the 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 functional inspection system,

A manual jig for placing a circuit board under test, applying a reference signal and power to the circuit board under test, and outputting the output signal of the circuit board under test and the measurement signal from each test point to a PC and a control box;

A control box for amplifying the measurement signal input from the manual jig according to a control command from the PC and applying the signal to the PC and applying a button selection signal to the manual jig;

The control device which controls the external control box and each internal device to display the output waveform of the circuit board and its test pattern on the monitor and measure the frequency of the output waveform, and the digital TV from the TV receiving device according to the control signal from the control device. Digital signal processing and outputting A / V signal or high frequency signal which is output signal of the graphic device to be synthesized and output on the monitor by combining the signal and the measured signal from the A / D converter and the manual jig. A / D converter which operates according to the trigger of TV receiver, video trigger device or level trigger device and converts measured signal input from the control box into digital signal and trigger signal of the small in accordance with control signal from the control device Is applied to the A / D conversion device and triggers a special waveform such as a video signal. Level trigger device that triggers a waveform of a general signal by applying a trigger signal to the A / D conversion device according to the control signal and the control signal from the control device, and a DIO device for data input / output between the control device and an external control box. And a PC comprising a storage device for storing the processing step and the processing result by the control device;

According to the input signal from the graphics device of the PC, the test pattern by the operation of the circuit board under test and the monitor of the measurement waveform detected at a predetermined test point.

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

First, referring to FIG. 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 measures the frequency of the output signal of the circuit board under test through the ISA bus. And a waveform of the video signal and the measurement signal from the TV receiving apparatus 213 through the ISA bus under the control of the control apparatus 211 and the control apparatus 211 for controlling the test pattern to appear on the monitor 22. TV receiver for digital signal processing such that A / V signal (i.e., audio / video signal) or RF signal input from graphic device 212 for processing graphics to be displayed and manual jig 23 can be recognized in a computer ( 213 and the A / D conversion device 214 and the control device 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. To (211) Video trigger device 215 and the control device 211 and an external control box that trigger the A / D converter 214 when the input signal of the A / D converter 214 is a video signal. 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 in charge of data input / output between the A / D converters 214. And a main memory device (HDD) 218 and an auxiliary memory device (FDD) 219 for storing data according to the processing and the processing result by the control device 211. The monitor 22 and the circuit board under which the PC main body 21, the image by the reference signal processed by the circuit board under test by the graphic device 212, and the output waveform of the circuit board under test are shown. And a plurality of inspection and adjustment buttons placed on the circuit board under test. And A / V signal or RF signal which is an output signal from the circuit under test according to the reference signal is applied to the PC main body 21, and the measurement signal from each test point is applied to the control box 24. It operates according to the manual jig 23 and the control signal applied from the DIO device 216 to amplify the measurement signal extracted from the circuit board by the manual jig 23 to be applied to the PC main body 21. The control 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.

Operation by the above configuration is performed as follows.

When the circuit to be inspected (not shown) is placed at the inspection 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 operate 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 a signal from the provided inspection and adjustment button, 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 DIO 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 with 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 the 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 conversion device 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 device 211. Is entered.

The graphic device 212 synthesizes the graphic TV signal and the measurement signal and applies the graphic signal to the monitor 22, whereby the 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 a measurement signal may appear on a portion of the screen at a predetermined size (that is, a size smaller than the entire screen), or the monitor 22 screen may be displayed. In half, a test pattern may appear on one side and a waveform of the measurement signal on the other side.

This depends on various applications and modifications of the invention.

As described above, the operator sees the test pattern and the measurement waveform displayed on the monitor 22, and judges whether or not the adjustment is made, and then operates the 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. 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 manual jig for placing a circuit under test, applying a reference signal and power to the circuit under test, and outputting the output signal of the circuit under test and the measurement signal from each test point to a PC and a control box; A control box for amplifying the measurement signal input from the manual jig according to a control command from the PC and applying the signal to the PC and applying a button selection signal to the manual jig; The control device which controls the external control box and each internal device to display the output waveform of the circuit board and its test pattern on the monitor and measure the frequency of the output waveform, and the digital TV from the TV receiving device according to the control signal from the control device. Digital signal processing and outputting A / V signal or high frequency signal, which is output signal of the graphic device to be synthesized and output on the monitor and the measurement signal from the A / D conversion device and the manual jig. A / D converter which operates according to the trigger of a TV receiver, a video trigger device or a level trigger device and converts a measurement signal input from the control box into a digital signal and a predetermined trigger signal according to a control signal from the control device. Is applied to the A / D conversion device and triggers a special waveform such as a video signal. And a level trigger device that triggers 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, and a DIO device responsible for data input / output between the control device and an external control box. A PC comprising a storage device for storing a processing step and a processing result by the control device; And a monitor in which a test pattern according to the operation of the circuit board under test and a measurement waveform detected at a predetermined test point are displayed according to an input signal from the graphic device of the PC.