JPS62126358A - Apparatus for measuring temperature characteristic - Google Patents

Abstract

PURPOSE:To make it possible to accurately measure a temp. characteristic within a short time, by simple equipment constituted so that electronic parts to be measured and standard electronic parts of which the temp. characteristic is known are mounted in a casing to provide a predetermined temp. condition. CONSTITUTION:An elastic surface wave device 12a being a standard product of which the temp. characteristic of resonance frequency is known and an elastic surface wave device 12b to be measured 12b are mounted to the sockets 13a, 13b of a base stand 11a and a lid body 11b is mounted to the base stand 11a. A cooling agent is sealed in the space of the base stand 11a and the lid body 11b from a blowing part 15 at a cooling time and hot air is sealed therein at a heating time by a dryer to adjust measuring temp. The resonance frequency of the elastic surface wave device 12a is measured by a frequency-measuring device 25 to measure temp. and, when predetermined temp. is obtained, the electrical characteristic value of the device 12b is measured at the predetermined temp. analyzed by a network analyser 21 by a phase amplitude display device 22.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a temperature characteristic measuring device that measures the temperature characteristics of, for example, a surface acoustic wave device.

[Technical Background of the Invention] Generally, surface acoustic wave devices are widely used as filters, resonators, etc. in television receivers, video tape recorders, etc.

Conventionally, the characteristics of such surface acoustic wave devices include frequency trap attenuation, insertion loss, resonance characteristics, and spurious characteristics. ! There are T delay characteristics, interelectrode capacitance, temperature characteristics, etc., and these characteristics must be measured during manufacturing.

Furthermore, electrical appliances such as the above-mentioned television receivers and videotape recorders are generally required to be used in a temperature range of -20°C to +70°C, and for use under special environmental conditions, they are required to be used in cold regions. So -40 degrees Celsius, +8 on hot ground.
A working temperature range of up to 5°C is required.

It is necessary that the temperature characteristics of the surface acoustic wave device be stable within such a usage temperature range, and it is necessary to measure the temperature characteristics within this usage temperature range during manufacturing.

Conventionally, measurement of the temperature characteristics of such surface acoustic wave devices has been carried out using a temperature characteristic measuring apparatus shown in FIGS. 6 to 8.

As shown in FIGS. 6 and 7, this temperature characteristic measuring device includes a base 1 provided with a socket 3 into which a surface acoustic wave device 2 is mounted, and a C-shaped connector provided on the base 1. 4 electrically connects the surface acoustic wave device 2 to the outside.

In FIG. 8, 5 is a sweep oscillator, 6 is a separator, 7 is a constant) B tank, 8 is a digital marker that specifies the oscillation frequency of the sweep oscillator 5, and 9 is an electrical characteristic 1 of the surface acoustic wave device 2.
The network analyzers 1a and 10 that analyze the directivity are phase and amplitude indicators that display the values output from the network analyzer Ff9.

The temperature characteristics of the surface acoustic wave device 2 are measured as follows using the apparatus configured as described above.

The surface acoustic wave device 2 is attached to the socket 3 of the base 1.

This base 1 is placed in a thermostatic oven 7, and a coaxial cable 7a that electrically connects the outside and the inside of the thermostatic oven 7 is connected to the base 1.
Connect to connector 4.

After setting the temperature in the thermostatic chamber 7 to a predetermined temperature and after 15 minutes or more have passed after reaching this temperature, (the oscillator horn of the hanging oscillator 5 is connected to the surface acoustic wave device 2 input.

The output is input to the network analyzer 9, and the phase (film width indicator 10) measures the electrical characteristics at this temperature.

When measuring electrical characteristics at different temperatures, set the constant temperature bath 7 to that temperature, and after 15 minutes or more have passed since the temperature reached that temperature, perform measurements in the same manner as above.

Usually, such measurements are carried out at -40'C1-20°C, 0°C,
Testing was carried out at 25°C, 140'C, 155°C, 70'C, and 85°C, and these characteristics are taken as temperature characteristics.

[Problems with the Background Art] As described above, in order to measure the temperature characteristics of the surface acoustic wave device 2, the thermostatic chamber 7 is set at a predetermined temperature, and after the thermostatic chamber 7 reaches this temperature, Since the electrical characteristics are measured after more than a minute has passed, it takes about 30 minutes to measure the electrical characteristics at one temperature, and it takes about 40 minutes to measure all the specified temperatures at the 8 points mentioned above. It takes more than an hour.

The long time it takes to measure the temperature characteristics of the surface acoustic wave device 2 means that the surface acoustic wave device 2 is left in the base 1 or the thermostatic chamber 7 for a long time, and this base
If it is left unattended for a long period of time, it is the base 1. The electrical contact at the connection part of the socket 3 and connector 4 may deteriorate.
This often results in inaccurate measurements.

Also, move the constant temperature bath 7, which has a large weight and volume, to a place near the measuring device that measures at room temperature! ! It is necessary to avoid installing J.

Furthermore, in order to provide a coaxial cable 7a that electrically connects the outside and the inside of the thermostatic oven 7,
It is necessary to drill at least two holes about the size of a dragon φ, and it is necessary to roughly seal the holes to prevent outside air from entering.

For this reason, a dedicated constant temperature bath 7 is required.

OBJECT OF THE INVENTION] The present invention has been made in response to such circumstances, and an object of the present invention is to provide a temperature characteristic measuring device that can accurately measure the humidity characteristics of an electronic component to be measured in a short time using simple equipment. It is an object.

[Summary of the Invention 1 The temperature characteristic measuring device of the present invention includes a casing,
The electronic components to be measured whose temperature characteristics are to be measured are mounted inside the casing, the standard electronic components whose temperature characteristics are known in advance are mounted inside the casing, and the electronic components mounted inside the casing are By providing temperature changing means for providing temperature conditions, the temperature characteristics of the electronic component to be measured can be measured accurately in a short time with simple equipment.

[Embodiments of the Invention] Hereinafter, details of embodiments of the present invention will be described based on the drawings.

1 to 4 are diagrams for explaining a temperature characteristic measuring device according to an embodiment of the present invention.

As shown in these figures, in this temperature characteristic measuring device, a casing 11 is composed of a base 11a and a container body 11b, and a lid 11b is attached to the base 11a.

A socket 13a is provided on the base 11a, into which a surface acoustic wave device 12a, which is a standard product whose temperature characteristics of resonance frequency have been confirmed, is mounted, and the temperature characteristics are measured close to this socket 13a. There are eight sockets 13b into which surface acoustic wave devices 12b are attached.

Cell connectors 14a, 14a', 14b, and 14b' are provided on the outer surface of the base 11a to electrically connect the connection terminals of the sockets 13a and 13b to the outside.

The lid body 11b is provided with an air outlet 15, through which a coolant, for example, is sealed when the inside of the casing 11 is to be cooled, and hot air, for example, from a dryer, is sealed through this air outlet 15 when the inside of the casing 11 is to be heated.

A push plate 16 is included in the cover 11b, and an elastic member 17 is inserted between the push plate 16 and the inner wall of the cover 11b, and an elastic member 17 is inserted into the sockets 13a and 13b of the base 11a. The surface wave devices 12a and 12b are attached to the lid body 11.
b @ When installed on the base 11a, the push plate 16 connects the top surfaces of both surface acoustic wave devices 12a and 12b to the sockets 13.
It is pressed in the directions a and 13b to ensure a secure connection.

Further, this push plate 16 is a thin plate made of copper material and is considered to have good thermal conductivity.
Surface acoustic wave devices 12a, 1 attached to a, 13b
2b are set to have the same temperature more accurately.

In addition, as shown in FIG. It is now entered.

The output signal is connected to the connector 14b' and the coaxial cable 20.
' is input to the network analyzer 1f21.

Network analyzer 2 to which such a signal is input
1, the electrical characteristic values are analyzed and the values are displayed by the phase amplitude display 22.

Furthermore, the oscillation frequency of the sweep oscillator 18 is determined by the digital marker 23.
It is specified by

A frequency measuring device 25 is connected to the connectors 14a, 14a' of the casing 11 by coaxial cables 24, 24', and is adapted to measure the resonant frequency of the surface acoustic wave device 12a attached to the socket 13a. .

The temperature characteristic measuring device configured as described above measures the temperature characteristics of the surface acoustic wave device 12b as described below.

Each socket 13a, 13b of the base 11a is equipped with a surface acoustic wave device 12, which is a standard product with known temperature characteristics of resonance frequency.
a surface acoustic wave device 12 whose temperature characteristics are measured
b, and then the lid 11b and the base 11a are attached.

Each coaxial cable 20.20', 24.24' is connected to the connector 14a, 14a', 14b, 14b'.

When the temperature is such that it is cooled from the air outlet 15, a coolant is sealed,
When the temperature is such that heating should be avoided, hot air is sealed in Dry 1A to adjust the measurement temperature.

Surface acoustic wave device 12 with known temperature characteristics of resonance frequency
The resonant frequency of the surface acoustic wave device 12a is measured by the frequency measuring device 25, and the temperature of the surface acoustic wave device 12a is set from this resonant frequency, and the temperature of the surface acoustic wave device 12a is set as the temperature of the surface acoustic wave device 12b under the same conditions.

When a predetermined temperature is reached through such measurements, the electrical characteristic value at the predetermined temperature analyzed by the network analyzer 21 is measured by the phase amplitude indicator 22.

Such measurements were carried out at -40°C, -20'C, 0°C, 25°
C140'C155°C170°C, carried out at 85°C,
This characteristic is referred to as a temperature characteristic.

In this way, the resonant frequency of the surface acoustic wave device 12a whose temperature characteristics of the resonant frequency are known is measured by the frequency measuring device 25, and the temperature of the surface acoustic wave device 12a is set from this resonant frequency. Since the temperature can be the temperature of the surface acoustic wave device 12b whose temperature characteristics are measured under the same conditions, the casing 1
It can be measured in a simple structure like 1, and the measurement time is generally very short.

This eliminates thermal deterioration of the measurement system, prevents measurement errors due to poor contact, etc., and allows accurate temperature characteristics to be measured.

[Effects of the Invention] As explained above, according to the temperature characteristic measuring device of the present invention, the measured and standard electronic components are mounted in the casing,
By applying a predetermined temperature range 11 to these components using a variable temperature means, the temperature characteristics of electronic components can be measured accurately in a short time with simple equipment.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a temperature characteristic measuring device according to an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a longitudinal sectional front view thereof, and FIG.
5 is a block diagram of the temperature characteristic measuring device of this embodiment, FIG. 6 is a longitudinal sectional front view of the conventional temperature characteristic measuring device, FIG. 7 is a plan view thereof, and FIG. It is a block diagram. 11...Casing 11a...Base 11b...
・・・・・・・・・・・・Lid body 12a・・・・・・・
....Surface acoustic wave device 12b whose temperature characteristic of resonance frequency is known...Surface acoustic wave device 13a, 13b whose temperature characteristic is measured. ...Sockets 14a, 14a', 14b, 14b'...
・・・・・・・・・Connector 15・・・・・・・・・・・・
...Air vent applicant Toshiba Corporation Patent attorney Sasa Suyama - Day 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 7

Claims (1)

[Claims] a casing, an electronic component to be measured whose temperature characteristics are to be measured, which is installed inside the casing, and a standard electronic component whose temperature characteristics are known in advance and which is installed inside the casing;
A temperature characteristic measuring device comprising: a temperature changing means for applying a predetermined temperature condition to each electronic component installed in the casing.