JP2007292588A - Measuring system - Google Patents

Measuring system Download PDF

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JP2007292588A
JP2007292588A JP2006120430A JP2006120430A JP2007292588A JP 2007292588 A JP2007292588 A JP 2007292588A JP 2006120430 A JP2006120430 A JP 2006120430A JP 2006120430 A JP2006120430 A JP 2006120430A JP 2007292588 A JP2007292588 A JP 2007292588A
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measurement
power supply
temperature
supply frequency
measuring
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JP4817117B2 (en
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Takahito Furuya
孝仁 古屋
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Yokogawa Electric Corp
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Yokogawa Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a measuring system capable of removing the noise components of power supply frequencies and measurements at a high speed, when a plurality of objects to be measured driven by different power supply frequencies are to be measured. <P>SOLUTION: The measuring system simultaneously measures a plurality of objects to be measured and is constituted of a module type measuring device, to which a plurality of measuring modules capable of separate settings of power supply frequencies are mounted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、測定システムに関し、詳しくは、測定結果に対する電源周波数ノイズの影響低減に関するものである。   The present invention relates to a measurement system, and more particularly to reduction of influence of power supply frequency noise on a measurement result.

工場設備などの工業計測分野における温度測定にあたっては、温度センサとして熱電対が広く用いられている。   Thermocouples are widely used as temperature sensors for temperature measurement in industrial measurement fields such as factory equipment.

ところが、熱電対の熱起電力は微弱であり、主に電源系統から回り込むノイズによって測定値がふらついてしまうことがある。そこで、測定値を安定化させる対処法として、例えば特許文献１にも記載されているように、積分型Ａ/Ｄ変換器を用い、その積分時間を電源周波数（５０Ｈｚなら２０ｍｓ、６０Ｈｚなら１６．７ｍｓ）に合わせて設定することが行われている。   However, the thermoelectromotive force of the thermocouple is weak, and the measured value may fluctuate mainly due to noise that circulates from the power supply system. Therefore, as a countermeasure for stabilizing the measurement value, for example, as described in Patent Document 1, an integration type A / D converter is used, and the integration time is set to a power supply frequency (20 ms for 50 Hz, 16. for 60 Hz. 7 ms).

例えば装置の開発や評価にあたっては、図２のブロック図に示すように、電源周波数が５０Ｈｚの測定対象１の温度を測定する図示しない熱電対の熱起電力は電源周波数が５０Ｈｚで積分時間が２０ｍｓの温度測定器３に入力し、電源周波数が６０Ｈｚの測定対象２の温度を測定する図示しない熱電対の熱起電力は電源周波数が６０Ｈｚで積分時間が１６．７ｍｓの温度測定器４に入力することが行われている。   For example, in the development and evaluation of the apparatus, as shown in the block diagram of FIG. 2, the thermoelectromotive force of a thermocouple (not shown) that measures the temperature of the measuring object 1 with a power supply frequency of 50 Hz is the power supply frequency of 50 Hz and the integration time is 20 ms. The thermoelectromotive force of a thermocouple (not shown) that measures the temperature of the measuring object 2 having a power frequency of 60 Hz is input to the temperature meter 4 having a power frequency of 60 Hz and an integration time of 16.7 ms. Things have been done.

また、電源周波数５０／６０Ｈｚ双方のノイズ成分が同時に除去できるように積分時間が１００ｍｓに設定された電源周波数５０／６０Ｈｚ共用型の温度測定器５を用い、測定対象１および２の温度を測定することも行われている。   Further, the temperature of the measuring objects 1 and 2 is measured by using the temperature measuring device 5 for the power frequency 50/60 Hz shared type set to 100 ms so that the noise components of both power frequencies 50/60 Hz can be simultaneously removed. Things are also done.

特開２００３−１４８９９６JP 2003-148996 A

しかし、電源周波数に合わせて個別に積分時間が設定された独立した温度測定器で測定するためには、それぞれの電源周波数で駆動するように構成された温度測定器を用意しなければならない。   However, in order to perform measurement with independent temperature measuring devices in which the integration time is individually set in accordance with the power source frequency, it is necessary to prepare temperature measuring devices configured to be driven at the respective power source frequencies.

また、電源周波数５０／６０Ｈｚ双方のノイズ成分が同時に除去できるように積分時間が１００ｍｓに設定された電源周波数５０／６０Ｈｚ共用型の温度測定器で測定する場合には、電源周波数に合わせて個別に積分時間が設定された独立した温度測定器で測定する場合に比べて測定周期が長くなってしまい、高速測定が困難になる。   Also, when measuring with a power source frequency 50/60 Hz shared type temperature measuring device whose integration time is set to 100 ms so that both noise components of the power source frequency 50/60 Hz can be removed simultaneously, individually according to the power source frequency. Compared with the case of measuring with an independent temperature measuring device with an integration time set, the measurement cycle becomes longer, and high-speed measurement becomes difficult.

本発明は、このような従来の問題点に着目したものであり、その目的は、異なる電源周波数で駆動される複数の測定対象の温度測定にあたり、電源周波数のノイズ成分が除去できるとともに高速測定が行える測定システムを提供することにある。   The present invention pays attention to such conventional problems, and its purpose is to remove noise components of the power supply frequency and perform high-speed measurement when measuring the temperature of a plurality of measurement objects driven at different power supply frequencies. It is to provide a measurement system that can be used.

このような課題を達成する請求項１の発明は、
同時に複数の測定対象を測定する測定システムであって、
個別に電源周波数が設定可能な複数の測定モジュールが装着されたモジュール型測定装置で構成されたことを特徴とする。 The invention of claim 1 which achieves such a problem,
A measurement system for measuring a plurality of measurement objects simultaneously,
It is characterized by comprising a module type measuring apparatus equipped with a plurality of measuring modules capable of individually setting the power supply frequency.

請求項２の発明は、請求項１記載の測定システムにおいて、
前記測定モジュールは、電源周波数が設定できる１チップ積分型Ａ/Ｄ変換器が実装されていることを特徴とする。 The invention of claim 2 is the measurement system according to claim 1,
The measurement module is mounted with a one-chip integrating A / D converter capable of setting a power supply frequency.

請求項３の発明は、請求項１記載の測定システムにおいて、
前記測定モジュールの電源周波数は、少なくとも５０Ｈｚ、６０Ｈｚ、５０／６０Ｈｚ共用のいずれかが設定できることを特徴とする。 The invention of claim 3 is the measurement system according to claim 1,
The power supply frequency of the measurement module can be set to at least one of 50 Hz, 60 Hz, and 50/60 Hz common use.

請求項４の発明は、請求項１記載の測定システムにおいて、
前記測定モジュールには熱電対の熱起電力が入力されることを特徴とする。 The invention of claim 4 is the measurement system according to claim 1,
A thermocouple electromotive force is input to the measurement module.

これにより、異なる電源周波数で駆動される複数の測定対象の温度測定にあたり、電源周波数のノイズ成分が除去できるとともに高速測定が行える測定システムが実現できる。   As a result, it is possible to realize a measurement system that can remove a noise component of the power supply frequency and perform high-speed measurement when measuring the temperature of a plurality of measurement objects driven at different power supply frequencies.

以下、本発明について、図面を用いて説明する。図１は本発明の一実施例を示すブロック図であり、図２と共通する部分には同一の符号を付けている。図１において、温度測定器６はモジュール型測定装置であり、複数の温度測定モジュール６１〜６３が装着されている。これら温度測定モジュール６１〜６３には、電源周波数と積分時間が制御モジュール６４から個別に設定できるように構成された１チップ積分型Ａ/Ｄ変換器が実装されている。   Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, and the same reference numerals are given to portions common to FIG. In FIG. 1, a temperature measuring device 6 is a module type measuring device, and a plurality of temperature measuring modules 61 to 63 are mounted. Each of the temperature measurement modules 61 to 63 is mounted with a one-chip integration A / D converter configured so that the power supply frequency and the integration time can be individually set from the control module 64.

温度測定モジュール６１は電源周波数が５０Ｈｚで積分時間が２０ｍｓに設定され、温度測定モジュール６２は電源周波数が６０Ｈｚで積分時間が１６．７ｍｓに設定され、温度測定モジュール６３は電源周波数が５０／６０Ｈｚ共用で積分時間が１００ｍｓに設定されている。   The temperature measurement module 61 has a power supply frequency of 50 Hz and an integration time of 20 ms, the temperature measurement module 62 has a power supply frequency of 60 Hz and an integration time of 16.7 ms, and the temperature measurement module 63 has a power supply frequency of 50/60 Hz. The integration time is set to 100 ms.

電源周波数が５０Ｈｚの測定対象１の温度を測定する図示しない熱電対の熱起電力は電源周波数が５０Ｈｚで積分時間が２０ｍｓに設定された温度測定モジュール６１に入力され、電源周波数が６０Ｈｚの測定対象２の温度を測定する図示しない熱電対の熱起電力は電源周波数が６０Ｈｚで積分時間が１６．７ｍｓに設定された温度測定モジュール６２に入力されている。   The thermoelectromotive force of a thermocouple (not shown) that measures the temperature of the measuring object 1 with a power supply frequency of 50 Hz is input to the temperature measurement module 61 in which the power supply frequency is 50 Hz and the integration time is set to 20 ms, and the power supply frequency is 60 Hz. The thermoelectromotive force of a thermocouple (not shown) that measures the temperature 2 is input to the temperature measurement module 62 in which the power supply frequency is 60 Hz and the integration time is set to 16.7 ms.

温度測定モジュール６１は電源周波数が５０Ｈｚで積分時間が２０ｍｓに設定されているので、測定対象１の温度を測定する熱電対の熱起電力に周波数が５０Ｈｚの電源から回り込むノイズの影響を打ち消すことができ、温度測定モジュール６２は電源周波数が６０Ｈｚで積分時間が１６．７ｍｓに設定されているので、測定対象２の温度を測定する熱電対の熱起電力に周波数が６０Ｈｚの電源から回り込むノイズの影響を打ち消すことができる。   Since the temperature measurement module 61 has a power supply frequency of 50 Hz and an integration time of 20 ms, it is possible to cancel the influence of noise that circulates from the power supply having a frequency of 50 Hz on the thermoelectromotive force of the thermocouple that measures the temperature of the measurement target 1. Since the temperature measurement module 62 has a power supply frequency of 60 Hz and an integration time of 16.7 ms, the influence of noise that circulates from the power supply with a frequency of 60 Hz on the thermoelectromotive force of the thermocouple that measures the temperature of the measurement object 2 Can be countered.

これにより、電源周波数が５０Ｈｚの測定対象１の温度と電源周波数が６０Ｈｚの測定対象２の温度を１台のモジュール型測定装置で同時に測定でき、高速で高精度の温度測定が行える。   Thereby, the temperature of the measuring object 1 with a power supply frequency of 50 Hz and the temperature of the measuring object 2 with a power supply frequency of 60 Hz can be simultaneously measured with one module type measuring apparatus, and high-speed and high-accuracy temperature measurement can be performed.

なお、電源周波数が５０／６０Ｈｚ共用で積分時間が１００ｍｓに設定されている温度測定モジュール６３を装着しておくことにより、温度測定モジュール６１の測定結果や温度測定モジュール６２の測定結果を必要に応じて検証できる。   It should be noted that the measurement result of the temperature measurement module 61 and the measurement result of the temperature measurement module 62 can be used as necessary by installing the temperature measurement module 63 having a power supply frequency shared by 50/60 Hz and an integration time set to 100 ms. Can be verified.

また、本実施例では、複数の温度測定モジュールが装着されたモジュール型測定装置を用いた測定システムについて説明したが、測定モジュールとして電源周波数と積分時間が制御モジュールから個別に設定できるように構成された１チップ積分型Ａ/Ｄ変換器が実装されたものを用いることにより、電源系統から回り込むノイズの影響を受けやすい各種信号の測定にも有効である。   Further, in this embodiment, the measurement system using the module type measurement apparatus equipped with a plurality of temperature measurement modules has been described. However, the measurement module is configured so that the power supply frequency and the integration time can be individually set from the control module. In addition, by using a one-chip integrating A / D converter mounted, it is also effective in measuring various signals that are easily affected by noise that circulates from the power supply system.

以上説明したように、本発明によれば、測定結果に対する電源周波数ノイズの影響を低減できる測定システムが実現でき、特に熱電対の熱起電力などの複数の微弱信号測定に好適である。   As described above, according to the present invention, a measurement system that can reduce the influence of power supply frequency noise on the measurement result can be realized, and is particularly suitable for measuring a plurality of weak signals such as thermoelectromotive force of a thermocouple.

本発明の一実施例を示すブロック図である。It is a block diagram which shows one Example of this invention. 従来の測定システムの一例を示すブロック図である。It is a block diagram which shows an example of the conventional measurement system.

符号の説明Explanation of symbols

１,２ 測定対象
６ 温度測定器(モジュール型測定装置)
６１〜６３ 温度測定モジュール

1, 2 Measurement object 6 Temperature measuring device (module type measuring device)
61-63 Temperature measurement module

Claims (4)

同時に複数の測定対象を測定する測定システムであって、
個別に電源周波数が設定可能な複数の測定モジュールが装着されたモジュール型測定装置で構成されたことを特徴とする測定システム。 A measurement system for measuring a plurality of measurement objects simultaneously,
A measurement system comprising a module type measurement apparatus equipped with a plurality of measurement modules capable of individually setting a power supply frequency. 前記測定モジュールは、電源周波数が設定できる１チップ積分型Ａ/Ｄ変換器が実装されていることを特徴とする請求項１記載の測定システム。   The measurement system according to claim 1, wherein the measurement module is mounted with a one-chip integrating A / D converter capable of setting a power supply frequency. 前記測定モジュールの電源周波数は、少なくとも５０Ｈｚ、６０Ｈｚ、５０／６０Ｈｚ共用のいずれかが設定できることを特徴とする請求項１記載の測定システム。   2. The measurement system according to claim 1, wherein the power supply frequency of the measurement module can be set to at least one of 50 Hz, 60 Hz, and 50/60 Hz. 前記測定モジュールには熱電対の熱起電力が入力されることを特徴とする請求項１記載の測定システム。   The measurement system according to claim 1, wherein a thermoelectromotive force of a thermocouple is input to the measurement module.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07162345A (en) * 1993-12-09 1995-06-23 Yamatake Honeywell Co Ltd Multi-point inputting two-wire transmitter
JPH08334392A (en) * 1995-06-07 1996-12-17 Yokogawa Electric Corp Multi-channel measuring device
JP2003148996A (en) * 2001-11-07 2003-05-21 Toshiba Corp Measuring device, temperature measuring device and temperature measuring method of rotary electric machine
JP2003533809A (en) * 2000-05-12 2003-11-11 ローズマウント インコーポレイテッド 2-wire on-site processable process equipment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07162345A (en) * 1993-12-09 1995-06-23 Yamatake Honeywell Co Ltd Multi-point inputting two-wire transmitter
JPH08334392A (en) * 1995-06-07 1996-12-17 Yokogawa Electric Corp Multi-channel measuring device
JP2003533809A (en) * 2000-05-12 2003-11-11 ローズマウント インコーポレイテッド 2-wire on-site processable process equipment
JP2003148996A (en) * 2001-11-07 2003-05-21 Toshiba Corp Measuring device, temperature measuring device and temperature measuring method of rotary electric machine

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