JPH02310480A - Jig for measurement - Google Patents

Abstract

PURPOSE:To allow the electrically and mechanically stable taking-out of signals for measurement by disposing terminals for measurement in correspondence to the wirings on a printed wiring board and fixing a terminal plate onto the circuit board while maintaining the electrical connection. CONSTITUTION:Electronic circuits to be measured are constituted on the printed wiring board 12 and the terminals 6 for measurement consisting of a good conductor are mounted on the terminal plate 7 so as to penetrate the plate. A connecting mechanism consisting of conductive rubber 10 and insulating rubber 9 and pins 8 for fixing the terminal plate for maintaining and fixing the specified position and spacing between the terminal plate 7 and the circuit board 12 exist between the terminal plate 7 and the circuit board 12. Electronic parts 14 are packaged onto the circuit board 12 by the connecting mechanism, such as conductive rubber 10. The terminals 6 for measurement and wirings 11 are connected without hindrance even in the case in which mounting terminals 15 thereof project onto printed wirings 11. The electrically and mechanically stable taking-out of the signals for measurement is executed in such a manner without being affected by the state of the jig mounting surface for measurement of the printed wiring board of the electronic circuits to be measured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a measuring jig for measuring signals on a printed wiring board of an electric circuit.

[Conventional technology]

Conventionally, when measuring signals on a printed wiring board, methods for extracting measurement signals include using signal lines of components mounted on the printed wiring board, or using pre-measured signals when designing the printed wiring board. It is customary to prepare wiring to mount measurement terminals in advance, or to solder measurement terminals onto the wiring pattern after the intermediate printed wiring board is completed.

[Problem to be solved by the invention]

When using the method described above to extract measurement signals from the circuit under test, * components with extremely short or small signal lines,
The use of components that do not expose signal lines during component mounting is increasing,
In many cases, the signal lines of components cannot be used as measurement terminals, and the number of components to be mounted on this printed wiring board increases.
As the spacing between components has become narrower, it has become difficult to secure enough space to place measuring instrument probes on the signal lines of each component and to provide separate terminals for measurement. As the number of components increases, the line width and line density of printed wiring also increases, making it difficult to manually add signal lines for extracting measurement signals.

In addition, with the method of manually applying the probe of the measuring instrument to the electronic circuit under test each time a measurement is made, it is possible to incorrectly place the measurement point on the electronic circuit under test, or the tip of the probe of the measuring instrument may touch the parts of the electronic circuit under test. If the terminals or printed wiring of the device are shorted or damaged, the probe of the measuring instrument often becomes detached from the electronic circuit under test during measurement.

[Means to solve the problem]

The measurement jig of the present invention includes a terminal board on which measurement terminals are arranged corresponding to the signals to be measured on the wiring on the printed wiring board of the electronic circuit to be measured, and this terminal board is connected to the printed wiring of the electronic circuit to be measured. A fixing mechanism for fixing on the board, and a connecting mechanism that is sandwiched between the printed wiring board of the electronic circuit under test and the terminal board and electrically connects the measurement terminal of the terminal board and the electronic circuit under test. It is characterized by comprising the following.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. A printed wiring board 1 includes an electronic circuit to be measured, and a terminal board 2
A measuring terminal 5 is arranged in correspondence with a signal to be measured of an electronic circuit configured on a printed wiring board, and the connecting mechanism 4 is fixed to the printed wiring board 1 by a fixing mechanism 3.

FIG. 2 is a sectional view of the first embodiment of the invention.

A measurement terminal 6, which is a good conductor, is mounted on the terminal plate 7 made of an electrical insulator so as to pass through the terminal plate 7. As shown in the figure, the measurement terminals 6 protruding from the terminal plate 7 are formed in a shape that allows easy connection to a probe of a measuring instrument. Between the terminal board 7 and the printed wiring board 12, there is a connection mechanism composed of a conductive rubber 1o and an insulating rubber 9, and a connection mechanism for maintaining and fixing the terminal board 7 and the printed wiring board 12 at a constant position and interval. There is a pin 8 for fixing the terminal board. The measurement terminal 6 is electrically connected to each part of the printed wiring 11 to be measured in the electronic circuit to be measured by the conductive rubber 10 without interfering with other measurement terminals. Furthermore, since the connection mechanism is made of the plastic insulating rubber 9 and the conductive rubber 10, the electronic components 14 can be mounted on the printed wiring board 12.
is mounted, and the terminal 15 is attached to the printed wiring 1.
1 or when a small surface-mounted electronic component 16 is mounted on the printed wiring 11, the measurement terminal 6 and the printed wiring 11 of the circuit under test can be connected without any problem. . The terminal board fixing pin 8 is inserted into the hole 13 for terminal board installation, and is fixed to the terminal board 7.
The position and spacing between the printed wiring board 12 and the printed wiring board 12 are kept constant.

According to this first embodiment, when mounting a measuring jig on a printed wiring board of an electronic circuit to be measured, small electronic components are mounted on one surface, and terminals are mounted on one surface. Even in cases where the printed wiring board is exposed or distorted, it is possible to extract electrically and mechanically stable signals for measurement. 3 is a sectional view of a second embodiment of the present invention.

A measuring terminal 18 and a probe 19 made of a good conductor are mounted on the terminal plate 17 made of an electrical insulator so as to pass through the terminal plate 17 as shown in the figure. The measurement terminal 18 and the probe 19 are electrically connected, and the electrical signal from the printed wiring 2o of the electronic circuit to be measured, which the probe 19 is in contact with, is extracted from the measurement terminal 18.

The probe 19 is made of a good conductor and elastic material, and by making the side that contacts the printed wiring 20 thinner, even if the distance between the terminal plate 17 and the printed wiring board 21 changes, this change can be absorbed. Furthermore, even if electronic components 24, 25, etc. are mounted, by arranging the probe so as to avoid them, it has a structure that allows connection to fine printed wiring patterns. In addition, the printed wiring board 21
The position and spacing between the terminal board 17 and the printed wiring board 21 are kept constant by the terminal board fixing screws 22 and the terminal board fixing screw holes 23 drilled in the terminal board 17 and the printed wiring board 21 .

According to this second embodiment, the measurement jig can be attached to a printed wiring board of an electronic circuit under test when electronic components are mounted on the surface or when the printed wiring pattern of the circuit under test is extremely fine. This has the effect of being able to extract electrically and mechanically stable signals for measurement even when drawn with high density.

〔Effect of the invention〕

According to the present invention, even when using components with extremely short or small signal lines or components where signal lines are not exposed when mounting one component, the number of components to be mounted on the printed wiring board increases and the number of components increases. Printed wiring lines on a printed wiring board can also be used when the distance between components is narrow and it is difficult to place the measuring instrument probe on the signal line of each component or to secure enough space to provide separate measurement terminals. In addition to being able to extract the measurement signal from the electronic circuit under test, even in cases where it is difficult to manually add signal lines to extract the measurement signal due to the narrow width and high line density, There is no need to manually attach the probe to the circuit under test, and the connection between the measurement signal extraction position of the electronic circuit under test and the probe of the measuring instrument is mechanically fixed, so there is no need to manually attach the probe to the circuit under test. Electrical, This has the effect that a mechanically stable signal for measurement can be extracted.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the invention, FIG. 2 is a sectional view of the first embodiment of the invention, and FIG. 3 is a sectional view of the second embodiment of the invention. 1... Printed wiring board, 2... Terminal board, 3...
Fixing mechanism, 4... Connection mechanism, 5... Measurement terminal, 6
...Measurement terminal, 7...Terminal board, 8...Terminal board fixing pin, 9...Insulating rubber, 10...Conductive rubber, 11...Printed wiring, 12...・Printed wiring board, 13... Hole for terminal board mounting, 14... Electronic component, 15... Terminal for electronic component mounting, 16... Small surface mount electronic component, 17... Terminal board , 18... Measurement terminal, 19... Probe, 20... Printed wiring, 21...
...Printed wiring board, 22...Terminal board fixing screw,
23...Screw hole for fixing terminal board, 24...Electronic component,
25...Electronic parts.

Claims (1)

[Claims] A terminal board on which measurement terminals are arranged in correspondence with signals to be measured on wiring on a printed wiring board of an electronic circuit to be measured; It is equipped with a fixing mechanism for fixing, and a connecting mechanism that is sandwiched between the printed wiring board of the electronic circuit under test and the terminal board and electrically connects the measurement terminal of the terminal board and the electronic circuit under test. A measurement jig characterized by: