JP2000329621A - Measuring apparatus with external conversion module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save a space and simplify a wiring work by setting at least one external conversion module of a unit different from a measurement unit to a terminal. SOLUTION: A conversion amplifier 5, a cold junction compensation circuit 6 and a driving power source circuit 7 are integrally incorporated in an external conversion module 10. The external conversion module 10 has a power source terminal 11 for external conversion module in addition to a Hi and a Lo terminals. A driving source for a measuring apparatus 1, e.g. a voltage of +5 V is connected to the power source terminal 11. The apparatus is connected to the driving power source circuit 7 when the external conversion module 10 is inserted to the terminal. When a temperature is measured by a thermocouple 3 as a sensor, a voltage of ±5 V is generated. An object to be measured with the use of the external module can be a strain or a frequency, and the measuring apparatus can be a thermometer while the external module can be a pressure gage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring instrument with an external conversion module suitable for use in portable measuring instruments and the like.

[0002]

2. Description of the Related Art Conventionally, as a portable voltage measuring instrument,
For example, those shown in FIGS. FIG.
4 is a plan view of the measuring instrument 1, and FIG. 4 is a side view of FIG. 3 viewed from the direction of arrow Z.
Is provided. FIG. 5 is an enlarged view of a portion A in FIG. As shown in FIG. 5, one set of terminals H and L is provided for each channel, and the H side is used as an input terminal and the L side is used as a ground terminal.

FIG. 6 shows a connection example for measuring a temperature with such a voltage measuring device 1. Reference numeral 3 denotes a temperature sensor (for example, a thermocouple); 4, an object to be measured; 5, a conversion amplifier to which a detection output from the sensor 3 is input; 6, a cold junction compensation circuit; Supplied by The output of the conversion amplifier 5 is connected to the Hi and Lo terminals of the measuring instrument 1 via the signal line 8.

[0004]

When the conversion amplifier 5 is separately provided, an external power supply for driving the conversion amplifier 5 must be separately provided.
Is connected to the measuring instrument 1 via the signal line 8, so that a wiring space is required.

The present invention has been made to solve such a problem. The conversion amplifier 5 is modularized so that it can be detachably attached to the measuring instrument 1, and power is supplied from the measuring instrument 1 to save space. It is another object of the present invention to realize a measuring instrument with an external conversion module that simplifies wiring work.

[0006]

In order to solve such a problem, according to a first aspect of the present invention, there is provided a measuring instrument having at least one terminal for inputting a signal of one unit of measurement. At least one external conversion module of a unit different from the unit is provided.

According to a second aspect of the present invention, in the measuring instrument with the external conversion module according to the first aspect, the external conversion module has three terminals, one is a signal terminal, and the other is supplied from a power supply of the measuring instrument. The other one is a ground terminal of a measuring circuit included in the measuring instrument and the module.

According to a third aspect of the present invention, in the measuring device with the external conversion module according to the first or second aspect, the external conversion module is provided when the signal unit measured by the sensor is different from one measuring unit of the measuring device. And then output to the measuring device side after converting to the signal unit.

According to a fourth aspect of the present invention, in the measuring device with the external conversion module according to any one of the first to third aspects, one measurement unit is a voltage, and the measurement other than the voltage input to the external conversion module is performed. It is characterized in that the unit is converted to a voltage and then output to the measuring instrument side.

According to a fifth aspect of the present invention, in the measuring instrument with an external conversion module according to any one of the first to fourth aspects, the external conversion module receives a single power supply from the measuring instrument and generates a dual power supply. And a circuit.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an example of an embodiment of the present invention. Only a point different from the conventional example shown in FIG. 5 in that a portion indicated by B surrounded by a dotted line in FIG. Are different.

In FIG. 1, the same elements as those in FIG. 5 are denoted by the same reference numerals. Reference numeral 10 denotes an external module, in which a conversion amplifier 5, a cold junction compensation circuit 6, and a drive power supply circuit 7a are integrally incorporated. The external conversion module of the present invention is provided with an external conversion module power supply terminal 11 in addition to the conventional Hi and Lo terminals.

The power supply terminal 11 is connected to, for example, a voltage of +5 V, which is a drive power supply for the measuring instrument 1, and is connected to the drive power supply circuit 7 when the external conversion module 10 is inserted into the terminal. When the temperature is measured by the thermocouple 3 as a sensor, a voltage of ± 5 V is generated.

FIG. 2 shows an embodiment in which a power supply terminal 11 to which a voltage is supplied from the measuring instrument 1 side is formed between the conventional H and L terminals, and an external module 10 is mounted as shown by a two-dot chain line. Things. In FIG. 2, when the distance between the H and L terminals is 20 mm and the length between the outer peripheries of the two terminals is 40 mm, the dimension a of the external module 10 is 40 mm and b.
Was 40 mm, and the thickness (not shown) was 30 mm.

The foregoing description of the present invention has been presented by way of illustration and example only of a particular preferred embodiment. Accordingly, the present invention is subject to many modifications, without departing from its essence,
It will be apparent to those skilled in the art that variations can be made. For example, in the embodiment of the present invention, the measuring device is described as a voltmeter, and the external module is described as a thermometer. However, the measurement object using the external module may be a strain or frequency, etc. The external module may be a pressure gauge.
The scope of the present invention, which is defined by the description in the appended claims, is intended to cover alterations and modifications within the scope.

[0016]

As described above, according to the present invention,
In a measuring instrument having at least one terminal for inputting a signal of one measurement unit, at least one external conversion module of a unit different from the measurement unit is provided at the terminal, so that space can be saved and wiring work can be performed. The measurement instrument with the external module which simplified was realized.

[0017]

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of an embodiment of a measuring instrument with an external module according to the present invention.

FIG. 2 is a diagram illustrating an example of a dimensional relationship in which a power supply terminal is provided and an external module is mounted.

FIG. 3 is a plan view of a conventional measuring instrument.

FIG. 4 is a side view of the conventional measuring instrument.

FIG. 5 is an enlarged view of a terminal portion of a conventional measuring instrument.

FIG. 6 is a configuration diagram showing a connection example for measuring a temperature with a conventional measuring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Measuring device 2 Input terminal 3 Sensor 4 Object to be measured 5 Conversion amplifier 6 Cold junction compensation circuit 7 Drive power supply circuit 10 External module 11 External module drive power supply terminal Hi signal terminal Lo ground terminal

Claims (5)

[Claims] 1. A measuring instrument having at least one terminal for inputting a signal of one measuring unit, wherein said terminal is provided with at least one external conversion module of a unit different from said measuring unit. Measuring instrument with external conversion module. 2. The external conversion module has three terminals, one is a signal terminal, one is a power supply terminal supplied from a power supply of the measuring instrument, and the other is a measuring terminal included in the measuring instrument and the module. The measuring instrument with an external conversion module according to claim 1, wherein the measuring instrument is a ground terminal of a circuit. 3. The external conversion module according to claim 1, wherein when a signal unit measured by the sensor is different from one measurement unit of the measuring device, the signal is converted into a signal unit of the measuring device and then output to the measuring device side. The measuring device with an external conversion module according to claim 1. 4. The apparatus according to claim 1, wherein one unit of measurement is a voltage, and a unit of measurement other than the voltage input to the conversion module is converted into a voltage and then output to the measuring device.
4. The measuring instrument with an external conversion module according to any one of 1 to 3. 5. An external conversion module according to claim 1, wherein said external conversion module has a power supply conversion circuit for inputting a single power supply from a measuring instrument to generate a dual power supply. Measuring instrument.