JPH02302678A - Apparatus for measuring temperature characteristics of electronic circuit part - Google Patents

Abstract

PURPOSE:To enhance the reliability of measurement by providing a pulse current passing circuit between a meter and a relay and turning the same ON to allow a pulse current to flow to a wiring route beforehand to reduce the contact resistance of an interposed contact part. CONSTITUTION:A pulse current passing circuit 20 consisting of a load resistor 22 and a switch 24 is provided between the voltmeter 18 of the wiring route positioned outside a thermostatic tank 2 and wiring change-over relays 16a - 16n. When the relay 16a corresponding to the electronic circuit part 6a among electronic circuit parts 6a after the switch 24 of the circuit 20 is turned ON, the pulse current determined by the output voltage of the part 6a and a load resistor 22 successively flows through the circuit 20 from a socket 4a, a connector 8, a cable 10, a connector 14 and the relay 16a and, therefore, an arc is generated in the mechanical connection parts of them and, as a result, an oxide film is destructed and contact resistance is reduced. In the same way, by successively changing over the relays 16b - 16n and reducing the contact resistances of all routes, measurement of high reliability can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a temperature characteristic measuring device used when electronic circuit components are placed in a constant temperature bath and their temperature characteristics are investigated.

<Prior Art> Generally, it is sometimes necessary to investigate the temperature characteristics of electronic circuit components including semiconductor elements to determine whether temperature compensation can be performed reliably.

In such cases, a temperature characteristic measuring device shown in FIG. 2 has conventionally been used. This device 10 includes a constant temperature bath 2, a measurement board 3 is housed inside the constant temperature bath 2, and electronic circuit components 63 to 6n to be measured are mounted on the measurement board 3 via sockets 4a to 4n. be done. Also,
The measurement board 3 is connected to a connector 8 provided inside the thermostatic oven 2, and cables 10 are connected to the connector 8, and each cable 10 is pulled out to the outside of the thermostatic oven 2 and connected to a measurement 112. There is. This measuring device 12 measures the connector 14 for connecting each cable 10, the wiring switching relay 16a=16n for selecting and switching each electronic circuit component 64 to 6n, and the output voltage of each electronic circuit component 6a to 6n. A voltmeter 18 is provided.

When one wiring switching relay, for example 16a, is selectively connected, the electronic circuit component 6a arranged in the thermostatic oven 2
Output from socket 4a, connector 8, cable 10
Valve the a1 connector 14 and relay 16a in order and check the voltmeter 1.
8 and the output voltage is measured. In this way, the wiring switching relays l6a-16n are sequentially switched, thereby measuring the output voltage of each of the electronic circuit components 63-6n.

<Problems to be Solved by the Invention> However, in the conventional device having the above configuration, the socket 48 on the measurement board 3 provided in the thermostatic chamber 2
~4n and the connector 8 are susceptible to oxidation on their surfaces under the influence of temperature, which may result in poor contact.

When a high impedance meter such as a voltmeter is used, the current flowing through the wiring path is extremely small, so the sockets 48 to 4n, connectors 8 and 14, and wiring switching relays 16a to 16n interposed in the wiring path are Even if a slight contact failure occurs, the output voltage will fluctuate, making it impossible to obtain accurate measurement results.

Means for Solving the Problems> The present invention has been made in view of the above circumstances, and it is necessary to check the sockets, connectors, and relays intervening in the wiring path in advance before starting the measurement of the temperature characteristics of electronic circuit components. It is possible to reduce the contact resistance such as, etc., so that highly reliable measurement results can be obtained at all times.

Therefore, in the present invention, Heng! T! and a meter such as a voltmeter or an ammeter for measuring the electrical characteristics of the electronic circuit components placed in the thermostatic chamber outside the thermostatic chamber, and wiring that electrically connects this meter to the electronic circuit component. The wiring route consists of a cable drawn out from inside the thermostatic oven, a connector that connects one end of this cable to an electronic circuit component in the thermostatic oven, a contact such as a socket, and the cable. In an apparatus for measuring temperature characteristics of electronic circuit components, the other end of which is connected to a meter, a relay is interposed between the load resistor and the switch between the meter and the relay in a wiring path located outside the thermostatic oven. It is characterized by the provision of a pulse current passing circuit.

In the above configuration, when investigating the temperature characteristics of electronic circuit components placed in a constant temperature oven, first turn on the switch of the pulse current passing circuit, and then turn on the wiring corresponding to the electronic circuit components. Turn on the route relay. As a result, a pulse current flows through the wiring path and the pulse current passing circuit, causing arcs and the like to occur at mechanical contact points such as relays, sockets, connectors, etc. As a result, the oxide film is destroyed and the contact resistance increases. becomes smaller.

<Example> Fig. 1 is a circuit configuration diagram of a temperature characteristic measuring device for electronic circuit components according to an embodiment of the present invention, and parts corresponding to the conventional example shown in Fig. 2 are given the same reference numerals. .

In FIG. 1, reference numeral l indicates the entire temperature characteristic measuring device, 2 is a constant temperature bath, 3 is a measurement board placed in the constant temperature bath 2, 4a to 4n are sockets provided on the measurement board 3, 6a ~6n is an electronic circuit component connected to each socket 48~4n, 8 is a connector for connecting the measurement board 3, lO
are each cable pulled out from the inside of thermostatic chamber 2,
12 is a measuring device, 14 is a connector for connecting the cable 10, 16a to +6n is a wiring switching relay for selectively switching each electronic circuit component 6a to 6n, and 18 is an output voltage of each electronic circuit component 6a to 6n. This is a voltmeter which is an instrument for measuring , and the configuration thereof is the same as that of the conventional example shown in FIG.

The present invention is characterized by a voltmeter 18 in the wiring route located outside the thermostatic oven 2 and wiring switching relays 16a to 16.
A pulse current passing circuit 20 consisting of a load resistor 22 and a switch (in this example, a relay switch 24) is provided between the terminal and the terminal.

Therefore, in the above configuration, when investigating the temperature characteristics of the electronic circuit components 63 to 6n arranged in the thermostatic chamber 2, first turn on the relay switch 24 of the pulse current passing circuit 20, and then turn on the relay switch 24 of the pulse current passing circuit 20. The wiring switching relay 16a of the wiring route corresponding to one electronic circuit component, for example 6a, is turned on. As a result, a pulse current determined by the output voltage of the electronic circuit component 6a and the load resistance 22 flows from the socket 4a1, connector 8, cable IO, connector 14, and wiring switching relay 16a through the pulse current passing circuit 20. Socket 4a, connector 8.14
An arc or the like occurs at each mechanical contact portion of the wiring switching relay 16a, and as a result, the oxide film is destroyed and the contact resistance is reduced. Similarly, each wiring switching relay 16b to 16n
By sequentially switching , the contact resistance of the mechanical contact portions of all wiring paths is reduced.

After that, the relay switch 2 of the pulse current passing circuit 20
4 is turned off, the output voltages of the original electronic circuit components 6a to 6n are measured with the voltmeter 18.

<Effects of the Invention> According to the present invention, when starting the measurement of the temperature characteristics of electronic circuit components, the pulse current passing circuit can be turned on to flow a pulse current through the wiring path in advance, so that the socket intervening in the wiring path can be , the contact resistance of connectors, relays, etc. is reduced, and as a result, excellent effects such as the ability to obtain highly reliable measurement results are exhibited.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram of a temperature characteristic measuring device for electronic circuit components according to an embodiment of the present invention, and FIG. 2 is a circuit configuration diagram of a conventional example of a temperature characteristic measuring device for electronic circuit components. ! ...Temperature characteristic measuring device for electronic circuit components, 2...Thermostatic chamber, 48-4n...Socket, 6a-6n...Electronic circuit component, 8.10...Connector, 16a-16n
... Relay, 18... Voltmeter (meter), 20... Pulse current passing circuit, 22... Load resistance, 24... Switch (relay switch).

Claims (1)

[Claims] (1) A thermostatic oven, a meter such as a voltmeter or an ammeter that measures the electrical characteristics of the electronic circuit components placed in the thermostatic oven outside the thermostatic oven, and a This wiring route consists of a cable drawn out from inside the thermostatic oven to the outside, and a connector, socket, etc. that connects one end of this cable to an electronic circuit component inside the thermostatic oven. and a relay connecting the other end of the cable to a meter. A device for measuring temperature characteristics of electronic circuit components, characterized by having a pulse current passing circuit consisting of a load resistor and a switch.