JPS5850379B2 - circuit testing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit testing device for testing the operation of a digital control circuit in an electronics-applied control device, for example, a continuously operated thyrisk inverter type uninterruptible constant electrification power supply device.

Since these power supplies are normally used for computer systems such as online real-time systems, it is often difficult to stop and inspect them.

On the other hand, in order to improve the operating rate, inspections for the purpose of preventive maintenance are required, and the majority of failures are related to the electronic control unit, which has a large number of components.

In addition, when inspecting test terminals installed on a board during operation using a test device such as an oscilloscope, there is a risk of a stoppage accident due to improper handling or the introduction of noise. desired.

The present invention has been made in consideration of the above points, and incorporates the technology of optical signal transmission that has been put into practical use recently, so that a display section such as a light emitting diode, which was conventionally provided as an operation display, can be connected to a glass fiber cable. It has a connector structure, and during testing, the check points are connected to a test device such as an oscilloscope using the cable, and the signal width, output level distortion, etc. are checked without going through any electrical circuits. By adding a converter that converts the optical signal transmitted by the glass fiber cable into an electrical signal between the two, it is possible to access the test circuit in a completely electrically isolated state even when the test circuit is in operation. The purpose of the present invention is to provide a circuit testing device that can perform tests without affecting the circuitry.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an example of a logic circuit such as a circuit board, and shows a pulse amplifier.

In the figure, 1 is a circuit board, 2 is a pulse amplifying section, 3 is a display section consisting of a light emitting diode, etc., and 4 is an electric signal test terminal.

Normally, multiple identical circuits are assembled, and in reality, AN
A wide variety of circuits are incorporated, including D, OR, and NAND circuits, as well as ring counters and flip-flops.

FIG. 2 shows an example of a circuit board, and a light emitting diode 3 is provided on the front of the main body of the circuit board 1 to display the operating status of a check point.

Although it is possible to visually determine whether the display is in operation or not, it is not possible to grasp the pulse width, level, distortion, and other conditions due to the high speed of the display.

Note that these displays may be displayed all at once on the display panel.

Conventionally, a test device such as an oscilloscope is connected to the test terminal 4 shown in FIG. 1 in order to check the operating state.

As shown in FIG. 3, the circuit testing device according to the present invention is installed in an optical connection with a light emitting diode 3 provided on a circuit board 1. An appropriate guide and connection mechanism is provided so that the connector 5 provided on the connector 5 is accurately connected and fixed to form an optical signal transmission system.

1 in the figure shows a photoelectric converter for converting an optical signal transmitted by a glass fiber cable 6 into an electrical signal, and the conversion output is transmitted to a tester 8 such as an oscilloscope.
It is configured so that it can be observed.

As described above, the circuit testing device according to the present invention detects an optical signal by arbitrarily attaching a connector of a glass fiber cable to an optical display section using a light emitting diode or the like conventionally provided on a circuit board, and converts this optical signal into an electrical signal. The test signal is converted into a signal that is then observed using a tester, and as it does not use an electrical system for the test signal detection section, there are no handling errors such as incorrect connections or stoppage accidents caused by noise contamination, as was the case in the past. Inspections can be easily performed even when the equipment is in operation, and the display section has a connector structure to which a glass fiber cable can be detachably connected, and optical signals can be extracted from the display section for testing. It has various advantages such as simple structure and economical.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram showing an example of a general test circuit, Fig. 2 is a front view and side view showing a circuit board with an operation indicator lamp on the side, and Fig. 3 is an embodiment of the present invention. It is a constituent country that shows the following. 1... Circuit board, 2... Pulse amplifying section, 3... Light emitting diode display section, 4...
・Test terminal, 5...Connector, 6...
Glass fiber cable, 1... photoelectric converter,
8... Test device.

Claims (1)

[Claims] 1. A display section with a connector structure that is provided on a circuit board and lights up according to signals from each test point of the circuit, and an optical signal is extracted from the display section via a glass fiber cable that is detachably connected to this display section. A circuit testing device consisting of a photoelectric converter that converts a signal into an electrical signal, and a tester that observes the converted output.