JPH04120481A - Test clip device - Google Patents

Abstract

PURPOSE:To execute effective heating while measuring only the temperature of a component to be tested which necessitates the heating, and also to enable simultaneous measurement of an electrical characteristic, by a method wherein a heating pad PD having a heating means and a temperature control means is brought into close contact with the component to be tested. CONSTITUTION:Heating PD 5 is fitted removably to a shaft 2 by a connecting rod 6 and connected with a wire 7 for heating and a Chromel wire 8a and an Alumel wire 8b for temperature measurement. Main bodies 1a and 1b of a test clip are joined by a shaft 2 and so actuated outward by a spring 4 as to hold a component to be tested, and electrode terminals 3a and 3b are embedded therein. The main bodies 1a and 1b of the clip thus prepared hold the component to be tested therebetween and the connecting rod 6 brings the PD 5 into pressure contact with the component. An electric signal from an electrode terminal 19 for observation is measured by a logic analyzer 25 and a controller 26 connected with a heating wire 22 and a thermocouple 21 controls the temperature of PD 23. By bringing the heating pad into direct pressure contact with the component to be tested, in this way, effective heating and measurement of an electrical characteristic are enabled while only the component is controlled to be at a set temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a test clip device equipped with a heating pad capable of measuring the electrical characteristics of a component under test while heating the component.

Conventional technology Generally, when performing a heating test on a printed circuit board and all electronic components such as ICs mounted on it, conventionally, the entire printed circuit board is tested using an environmental testing machine such as a constant temperature oven. Ta. However, as shown in FIG. 7, when performing a conventional partial heating test on an electronic component 42a mounted on a printed circuit board 41, a constant temperature oven cannot be used. The test was conducted using a pseudo heating means such as an electric dryer 43 that locally heats the area using hot air.

Problems to be Solved by the Invention However, in the conventional heating means using hot air, in reality, not only the test component 42a that requires heating but also the components mounted around it that do not need to be heated 42
b will also be heated. Therefore, the influence of the surrounding parts 42b may appear on the test results, and the test results may be affected by the surrounding parts 42b.
It becomes difficult to obtain accurate results from a heating test. Furthermore, if the parts 42b around the part to be tested 42a are sensitive to heat, the parts 42b may be destroyed.

The present invention solves such conventional problems, and
The purpose of the present invention is to provide a test clip that can closely contact only the parts to be tested that require heating, such as C, to effectively heat them while measuring temperature, and at the same time measure electrical characteristics. It is something.

Means for Solving the Problem In order to solve this problem, the present invention provides two test clip bodies rotatably connected by a shaft, a spring that biases the upper part of the test clip body outward, The upper end is detachably supported by the shaft, and the lower end has a retractable connecting rod equipped with a heating pad having heating means and temperature control means, and the heating pad is connected to the retractable connecting rod by the retractable connecting rod. It is configured to be biased downward and brought into contact with electronic components.

Function: With this configuration, the part to be tested can be sandwiched between the test clip main bodies, and the heating pad having the part heating means and the temperature measuring means can be directly pressed against the part to be tested and brought into close contact with the part to heat it. As a result, only the part under test can be selectively heated while simultaneously measuring the temperature, allowing accurate heating tests to be performed without heating parts other than the part under test and affecting the measurement results. Become.

EXAMPLE A test clip according to an example of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 show the test results of this embodiment.

The configuration of the group is shown below. As shown in FIG. 1, the test clip bodies 1a and lb are connected by a shaft 2, and are urged outward by a spring 4 so as to sandwich the part to be tested. Moreover, electrode terminals 3a are electrically connected inside the test clip bodies 1a and lb.

3b is buried. The heating pad 5 is removably fitted to the shaft 2 by a connecting rod 6, and is connected to the heating wire 1.
5. An electric wire 7 for heating and a chromel electric wire 8a for temperature measurement,
Alumel electric wire 8b is connected. Figure 2 shows connecting rod 6
The detailed configuration of the heating rod 5 is shown. As shown in the figure, the connecting rods 9 and 10 are urged by a spring 11 and are configured to be expandable and retractable. The width is slightly narrower than the diameter of shaft 2 (formed,
It is removably fitted to the shaft 2. heating pad 5
is constructed by laminating elastic bodies 13a, 13b, and 13c such as silicone rubber with excellent electrical insulation and thermal stability, and the bottom layer elastic body 13c is thin (formed). An electric wire 16 that supplies power to the heating wire 15 is connected to the heating wire 15 at a joint 17, and the electric wire 16, the chromel wire 14a, and the alumel wire 14b are coated with a heat-resistant coating 1.
Covered by 8. FIG. 3 shows the elastic body 13a and the elastic body 13.
It is a cross-sectional view of the glabella shown in FIG. FIG. 4 is a sectional view between the eyebrows of the elastic body 13b and the elastic body 13c, and shows a chromel wire 14a and an alumel wire 14b forming a thermocouple 19 as a temperature measuring means in the center.
It has a configuration in which it is wired.

The configuration of a heating test apparatus using the test clip configured as described above is shown in FIGS. 5 and 6.

Figure 5 is a circuit diagram of the heating test device, 26
is a controller that has the function of adjusting the temperature of the heating wire 22 while measuring the temperature with a thermocouple 21, and keeping the heating pad 23 at a constant temperature at all times.

FIG. 6 shows the configuration of a heating test apparatus using test chests and tubes according to an embodiment of the present invention. As shown in the figure, the test clip bodies 1a and lb sandwich the part under test 31, and the heating pad 5 connects the part under test to the part 31 by means of an expandable connecting rod 6.
1 is crimped.

Next, a heating test using the heating test apparatus configured as above will be explained.

The electrical signal observed by the electrode terminal 20 shown in FIG. 5 is measured by a logic analyzer 25. Further, the controller 26 is connected to the heating wire 22 and the thermocouple 21, and controls the temperature of the heating pad 23. Also,
As shown in FIG. 6, the elastic body 13a shown in FIG.
.

13b and 13c are deformed and come into close contact with the component under test 31,
Can be heated evenly.

In this manner, in this embodiment, the heating pad 5 is brought into close contact with the component under test 31 by direct pressure, and only the component under test 31 can be effectively heated while being controlled to a predetermined temperature. In addition, since the component 32 that does not require heating is not heated, the test results are not affected by heating of the surrounding components 32, and only the component 31 to be tested can be correctly heated. Further, it goes without saying that the surrounding parts 32 will not be heated and destroyed.

Effects of the Invention As is clear from the above description of the embodiments, the test clip of the present invention has a component heating means and a temperature measuring means, and is equipped with a heating pad that heats the component to be measured in close contact with it. By pressing this heating pad directly against the part under test and bringing it into close contact with the part under test, it is possible to effectively heat only the part under test without heating the surrounding parts. Heating tests can be performed correctly without affecting the results.

Further, when the heating pad is removed from the test clip main body, it can be used in exactly the same way as a conventional test clip.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a test clip according to an embodiment of the present invention;
Figure 2 is a sectional view of the main parts of the test clip, Figure 3 is a plan view of the electrothermal pair in the heating pad, Figure 4 is a plan view of the thermoelectric heating in the heating pad, and Figure 5 is the heating test. A circuit block diagram of the apparatus, FIG. 6 is a perspective view of the heating test apparatus, and FIG. 7 is a perspective view showing the configuration of a conventional heating test apparatus. la, lb...Test clip body, 2...
...Shaft, 4...Spring, 5...
Heating pad, 6... Connecting rod, 7... Electric wire, 8a... Chromel electric wire, 8b...
Alumel electric wire, 9, 10...Connecting rod, 11...
...Spring, 12...Connection part with shaft,
13a, 13b, 13c...Elastic body, 14a.
...Chromel wire, 14b...Alumel wire, 15...Heating wire, 19...Thermocouple,
21...Thermocouple, 22...Heating wire, 23...Heating barad, 24...Test clip.

Claims (1)

[Claims] Two test clip bodies are rotatably connected by a shaft, a spring biases the upper part of the test clip body outward, the upper end is detachably supported by the shaft, and the lower end is provided with a heating means and a temperature control member. 1. A test clip device comprising: a retractable connecting rod equipped with a heating pad having a control means; the heating pad is biased downward by the retractable connecting rod to bring it into contact with an electronic component.