JP2003057077A - Data collecting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data collecting apparatus that can accurately store a data outputted from a measuring device without increasing data storage capacity during storing of the data, and easily manage the data. SOLUTION: This data collecting apparatus is provided with a sampling means 32 that samples measurement data concerning an inputted current value or an electric energy, etc., at a specified cycle, a CPU 33 for computing the sampling data, and a data storage means 36 that stores the data computed by the CPU 33. In addition, it is also provided with a sampling condition setting means 37 that sets sampling conditions on the basis of the data processing result of the CPU 33, and when the value of the measurement data exceeds a specified value, the sampling condition setting means 37 change the sampling condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data collecting device, for example, a data collecting device for collecting and storing data such as electric energy, electric current, flow rate of water, temperature and pressure used in factories and buildings. is there.

[0002]

2. Description of the Related Art FIG. 11 is a block diagram showing the structure of a conventional data collecting apparatus. In this figure, 1 is current,
A plurality of measuring devices for measuring voltage, electric energy, flow rate of water, temperature, pressure, etc., 2 is an input means configured by a keyboard or mouse for setting various operations of a data collecting means described later, and 3 is a data collecting means And is composed of the following elements. That is, 31 is an input port for inputting data input from the measuring device 1 or the input means 2 to the data collecting means 3, for example, an input port formed of a multiplexer,
Reference numeral 32 is a sampling means for periodically sampling the data input from the input port 31.

Reference numeral 33 is a CPU for processing the sampled data, 34 is a memory storing a program for controlling the CPU 33, 35 is an output port for outputting the data processed by the CPU 33, and 36 is an output port 35. Data storage means for storing data, for example, a hard disk, and 4 are output devices, for example, CRT, printer, removable disk, for displaying and storing data output from the output port 35.

Next, the operation of the conventional data collecting apparatus configured as described above will be described. First, the input means 2
The data collection means 3 inputs the collection conditions such as the sampling cycle of the data to be collected and the content of the data to be collected. Next, when data is input from the measuring device 1 to the input port 31, the sampling means 32 is input by the input means 2.
The collected data set by is collected from the measuring device 1 at the set sampling cycle.

Thereafter, the CPU 33 processes the data according to the program stored in the memory 34, outputs the processed result to the data storage means 36 through the output port 35, and stores the data. Further, the data stored in the data storage unit 36 is displayed on the CRT which is the output device 4, printed by a printer, or transmitted to another device (not shown).

[0006]

Since the conventional data collecting apparatus is configured as described above, in order to store the data output from the measuring apparatus 1 with high accuracy, the sampling time at the time of sampling the data is set. Needs to be shortened. In addition, at the time of measurement, there are times when the measurement device that is the measurement target does not operate, and there are times when the data to be measured hardly changes. As a result, the data volume of the collected data becomes large, and it is difficult to manage the collected data.

The present invention has been made in order to solve such a problem, and can accurately store the data output from the measuring device without increasing the data storage capacity during data storage, and The purpose is to obtain a data collection device that is easy to manage.

[0008]

A data collecting apparatus according to the present invention comprises sampling means for sampling input measurement data such as current value and electric energy at a predetermined cycle,
CPU that processes sampling data and this CP
In a data collection device provided with a data storage means for storing data processed by U, a sampling condition setting means for setting a sampling condition based on the data processing result of the CPU is provided, and the value of the input measurement data is When the value exceeds the predetermined value, the sampling condition setting means changes the sampling condition.

The data collecting apparatus according to the present invention also includes
The sampling conditions are changed so as to shorten the sampling cycle.

The data collecting apparatus according to the present invention also includes
Data including sampling means for sampling measured data such as input current value and electric energy in a predetermined cycle, a CPU for processing the sampling data, and a data storage means for storing the data processed by the CPU The collecting device is provided with a data temporary storage means for temporarily storing the sampled measurement data and a sampling condition setting means for setting sampling conditions according to the data processing result of the CPU, and the data is stored in the data temporary storage means. The sampling conditions are changed based on the rate of change between the previous sampling data and the sampling data stored thereafter.

The data collecting apparatus according to the present invention also includes
When the rate of change exceeds a predetermined value, the sampling condition is changed by shortening the sampling cycle.

The data collecting apparatus according to the present invention also includes
Data including sampling means for sampling measured data such as input current value and electric energy in a predetermined cycle, a CPU for processing the sampling data, and a data storage means for storing the data processed by the CPU The collecting device is provided with sampling condition setting means for setting sampling conditions based on the data processing result of the CPU, and when the value of the input measurement data exceeds a predetermined value, the sampling means measures other measurement data. The data is stored in the data storage means.

The data collecting apparatus according to the present invention also includes
Data including sampling means for sampling measured data such as input current value and electric energy in a predetermined cycle, a CPU for processing the sampling data, and a data storage means for storing the data processed by the CPU The collecting device is provided with a data temporary storage means for temporarily storing the sampled measurement data and a sampling condition setting means for setting sampling conditions according to the data processing result of the CPU, and the data is stored in the data temporary storage means. When the rate of change between the previous sampling data and the sampling data stored thereafter exceeds a predetermined value, other measurement data is measured by the sampling means and saved in the data saving means.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a block diagram showing the configuration of the first embodiment, FIG. 2 is a flow chart showing the operation of the first embodiment, and FIG. 3 is a time chart showing the operation of the first embodiment. In FIG. 1, reference numeral 1 denotes a plurality of measuring devices for measuring current, voltage, electric power, water flow rate, temperature, pressure and the like, and 2 is formed by a keyboard, a mouse or the like for setting various operations of a data collecting means described later. The input means 3 is a data collecting means, and is composed of the elements described below. That is, 31 inputs the data input from the measuring device 1 or the input means 2 to the data collecting means 3, for example, an input port composed of a multiplexer, and 32 periodically samples the data input from the input port 31. It is a sampling means.

Reference numeral 33 is a CPU for processing the sampled data, 37 is a sampling condition setting means for setting sampling conditions based on the data processing result of the CPU 33, 34 is a memory storing a program for controlling the CPU 33, and 35 is An output port for outputting data processed by the CPU 33, 36 stores data output from the output port 35, data storage means such as a hard disk, and 4 displays or stores data output from the output port 35, For example, it is an output device such as a CRT, a printer, or a removable disk.

Next, the operation of the first embodiment configured as described above will be described based on the flowchart of FIG. First, in step S20, a collection condition such as a sampling period is input from the input unit 2. Next, step S2
At 1, data is input from the measuring device 1 to the input port 31. In step S22, the sampling means 32 always samples the data input from the measuring device 1, and determines whether or not the basic cycle T has elapsed according to the time required from the previous collection to the current collection.

When it is determined in step S22 that the basic period T has elapsed, the data collected in step S23 is stored in the data storage means 36 as collected data A (36a). When it is determined in step S22 that the basic cycle T has not elapsed, the input means 2 is previously set in step S24.
It is determined whether or not the predetermined sampling period Ti set in step 3 has elapsed. If it is determined in step S24 that the sampling period Ti has not elapsed, step S24
Returning to step 22, the determination process of the original basic cycle T is performed. When it is determined in step S24 that the sampling period Ti has elapsed, it is determined whether the collected data exceeds a preset instantaneous value Xi.

When it is determined in step S25 that the collected data exceeds Xi, the sampling means 32 collects the measured data from the measuring device 1 in step S26 and stores it in the data storage means 36 as collected data i (36i). At the same time, the process returns to step S22. If the collected data is smaller than the predetermined instantaneous value Xi in step S25,
The process directly returns to step S22, which is the basic period determination process.

Next, the operation of the above-described first embodiment will be described with a specific example. For example, in the case where the current value measured by the measuring device 1 is periodically collected with the basic cycle of 60 minutes, if a predetermined instantaneous upper limit value Xi and the upper limit value Xi are exceeded by the input means 2 in advance, Consider a case where it is set to separately record current value data for a sampling period of 10 minutes. However, it is assumed that the sampling means 32 collects current value data from the measuring device 1 at intervals of 1 minute.

The sampling means 32 judges every time measurement data is collected from the measuring device 1 whether the basic period has passed, that is, whether it is every hour on the hour. If it is determined that it is every hour on the hour, the data collected this time is stored in the data storage unit 36 as the collected data A (36a), and whether the sampling period of 10 minutes has elapsed from the previous data recording time is determined. Make a decision.

If it is determined that 10 minutes have not elapsed, the process returns to the elapse determination process for the basic period of 60 minutes, but if it is determined that 10 minutes have elapsed, the predetermined instantaneous value Xi and the current time are collected. When it is determined that the data collected this time is large by comparing with the data, the data collected this time is recorded in the data storage means 36 as the collected data B (36b). Although the above-described first embodiment has described the case of measuring the current, the same applies to the case of measuring the amount of electric power or the flow rate of water.

Since the data collecting apparatus of the first embodiment is configured as described above, the data is not collected when the measured data does not exceed the predetermined instantaneous upper limit value Xi or when the measuring apparatus does not operate. There is no need to lengthen the sampling cycle to be stored in the data storage unit and increase the storage capacity of the data storage unit. Further, when the data exceeds the predetermined instantaneous upper limit value Xi, the sampling period is shortened and the data is stored, so that the data can be collected without lowering the accuracy.

Embodiment 2. Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 4 shows the second embodiment.
5 is a flow chart showing the operation of the second embodiment, and FIG. 6 is a time chart showing the operation of the second embodiment. Further, in FIG. 4, the same or corresponding parts as those in FIG. The difference from FIG. 1 is that a data temporary storage means for temporarily storing the sampled data is provided. That is, in FIG. 4, reference numeral 38 denotes a data temporary storage means for temporarily storing the data sampled by the sampling means.

Next, the operation of the second embodiment configured as described above will be described with reference to the flowchart of FIG. In the flowchart of FIG. 5, steps up to step S52 are exactly the same as steps up to step S22 of the flowchart shown in FIG.
If it is determined in step S52 that the basic period T has elapsed, the data collected in step S53 is stored in the data storage means 36 as the collected data A (36a), and temporarily stored in the data temporary storage means 38 as the collected data. Remember. If it is determined in step S52 that the basic period T has not elapsed, or if the collected data A has been stored, it is determined in step S54 whether a predetermined sampling period Ti set in advance by the input means 2 has elapsed. . If it is determined in step S54 that the sampling period Ti has not elapsed, the process returns to step S52 and the original basic period T is determined.

When it is determined in step S54 that the sampling period Ti has elapsed, the CPU 33 includes the previous value temporarily stored in the data temporary storage means 38 and the current value sampled by the current sampling means 32. And calculate the rate of change from the previous value. The result of the change rate and the predetermined change rate ΔXi set by the input means 2 in advance.
Is compared in step S56. If the rate of change is larger than the predetermined rate of change ΔXi, the data of the current value is stored in the data storage unit 36 as collected data different from the collected data A of the basic cycle as the collected data i (36i) in step S57. And the data temporary storage means 3
It is stored in 8 as the previous value and the process returns to step S52. When the change rate in step S56 is smaller than the predetermined change rate ΔXi, the process directly returns to step S52, which is the basic period determination process. After that, the collected data is output to the CRT or printer that is the output device 4.

Next, the operation of the above-described second embodiment will be described with a specific example. For example, in the case of collecting the current value measured by the measuring device 1 periodically with the basic cycle of 60 minutes, if the change rate ΔX of the predetermined current by the input means 2 and this change rate ΔX are exceeded, Consider, for example, a case where it is set to separately record current value data for a sampling period of 10 minutes. However, it is assumed that the sampling means 32 collects current value data from the measuring device 1 at intervals of 1 minute.

The sampling means 32 determines whether or not the basic period has passed, that is, every hour on the hour, every time measurement data is collected from the measuring device 1. If it is determined that it is every hour on the hour, the data collected this time is stored in the data storage means 36 as the collected data A (36a),
Next, after storing the previous data, it is determined whether or not 10 minutes have elapsed in the sampling cycle. If it is determined that 10 minutes have not elapsed, the process returns to the basic cycle 60 minutes elapsed determination processing, but 10 minutes If it is determined that the time has elapsed, the change rate is calculated from the temporarily stored previous value and the current value, and as a result of comparison with the predetermined value ΔX, if the change rate is determined to be large, the data collected this time is used. The collected data i (36i) is stored in the data storage means 36. In addition,
The collected data B (36b) is a data file that stores measurement data other than the current value.

Although the second embodiment has been described with respect to the case of measuring the electric current, the same applies to the case of measuring the amount of electric power or the flow rate of water. The data collecting apparatus according to the second embodiment configured as described above lengthens the sampling cycle for storing the data in the data storing means when the measured data hardly changes or when the measuring apparatus does not operate, The storage capacity of the data storage means is not increased, and when the rate of change of data is large, the sampling period is shortened to store the data, so that the data can be collected without lowering the accuracy.

Embodiment 3. Next, a third embodiment of the invention will be described. Since the configuration of the third embodiment is similar to that of the first embodiment shown in FIG. 1, description of the configuration will be omitted. 7 is a flowchart showing the operation of the third embodiment, and FIG. 8 is a time chart of the third embodiment.

Next, the operation of the third embodiment will be described. In the flowchart of FIG. 7, steps up to step S73 are exactly the same as steps up to step S23 shown in FIG. When it is determined in step S72 that the basic period T has not elapsed and when the collected data A is stored, it is determined in step S74 whether or not the predetermined instantaneous value Xi set in advance is exceeded. In step S74, the collected data has a predetermined instantaneous value Xi.
If it is determined that the value exceeds the
In step S75, additional other measurement data is collected from the measuring device 1 preset in the input device 2 or the same measuring device 1. In step S76, the other additional measurement data is stored in the data storage means 36 as the collected data i (36i), and the process returns to step S72. Step S74
If the collected data is less than the predetermined instantaneous value Xi in step S72, the basic cycle determination process is performed as it is.
Return to.

Next, the operation of the above-described third embodiment will be described with a specific example. For example, in the case of collecting the period electric energy regularly measured by the measuring device 1 with the basic cycle of 60 minutes, when a predetermined instantaneous upper limit value Xi and the upper limit value Xi are exceeded by the input means 2 in advance. Let us consider a case in which the current value data, which is another measurement data, is set to be separately recorded. However, it is assumed that the sampling means 32 collects data on the amount of electric power from the measuring device 1 at intervals of 1 minute.

The sampling means 32 determines whether or not the basic cycle has passed each time measurement data is collected from the measuring device 1, that is, whether or not the basic cycle has come. If it is determined that it is every hour on the hour, the data collected this time is stored in the data storage means 36 as the collected data A (36a), and then it is judged whether or not the collected data this time exceeds the upper limit value Xi. To do. When it is determined that the time has not exceeded, the process returns to the basic period 60-minute elapsed determination process, but when it is determined that the time has exceeded, current value data is separately collected, and that data is collected data B (36b). The data is stored in the data storage means 36.

Although the above-described third embodiment has described the case where the current value is additionally measured, the same applies to the case where the voltage, the flow rate of water, and the like are additionally measured. The data collecting apparatus according to the third embodiment configured as described above determines the amount of data to be stored in the data storing unit when the measured data does not exceed the predetermined upper limit value Xi or when the measuring apparatus does not operate. The storage capacity of the data storage means is not increased, and the data has a predetermined upper limit value Xi.
In the case of exceeding, the other necessary data is additionally measured and stored, so that it is possible to efficiently collect data while saving the use area of the data storage means.

Fourth Embodiment Next, a fourth embodiment of the invention will be described. Since the configuration of the fourth embodiment is similar to that of the second embodiment shown in FIG. 4, the description of the configuration is omitted. FIG. 9 is a flowchart showing the operation of the fourth embodiment, and FIG. 10 is a time chart of the fourth embodiment.

Next, the operation of the fourth embodiment will be described. In the flowchart of FIG. 9, steps up to step S93 are exactly the same as steps up to step S53 shown in FIG. When it is determined in step S92 that the basic period T has not elapsed, and when the collected data A is stored, the CPU 33 causes the previous value temporarily stored in the data temporary storage means 38 and the current time sampled by the current sampling means 32. The value and the value are included in the calculation, and the rate of change from the previous time is calculated in step S94.

The result of step S94 and the input means 2 in advance
The comparison with the predetermined change rate ΔXi set in step S95 is performed in step S95. When it is determined that the rate of change exceeds Xi, the sampling unit 32 adds additional measurement data in step S96 from the measurement device 1 preset by the input unit 2 or other data measured by the same measurement device 1. To collect. In step S97, the additional measurement data is stored as the collected data B (36b) in the data storage means 36 and also in the data temporary storage means 38 as the previous value, and the process returns to step S92. If the change rate is smaller than the predetermined change rate ΔXi in step S95, the process directly returns to step S92, which is the basic period determination process.

Next, the operation of the above-described fourth embodiment will be described with a specific example. For example, when the basic period is set to 60 minutes and the period electric energy of the measuring device 1 is periodically collected, a predetermined rate of change ΔX is input by the input means 2 in advance,
Consider a case where the current value data, which is another data, is separately recorded when the rate of change ΔX is exceeded. However, it is assumed that the sampling means 32 collects data on the amount of electric power from the measuring device 1 at intervals of 1 minute. The sampling means 32 determines whether or not the basic cycle has passed each time measurement data is collected from the measuring device 1, that is, whether or not it is on the hour every hour.

If it is determined that it is every hour on the hour,
The data collected this time is stored in the data storage means 36 as collected data A (36a). Next, the rate of change is obtained from the previous value and the current value temporarily stored in the data temporary storage means 38, and compared with the predetermined value ΔX. Value data is separately collected, and the data is stored in the data storage means 36 as collected data B (36b).

Although the fourth embodiment has been described with respect to the case of additionally measuring the current value, the same applies to the case of additionally measuring the voltage, the flow rate of water, and the like. The data collection device according to the fourth embodiment configured as described above limits the amount of data to be stored in the data storage means when the data to be measured hardly changes or when the measurement device does not operate, and saves the data. The storage capacity of the data storage means is not increased, and other necessary data is additionally measured and stored when the rate of change of the data is large. Data collection is possible.

In each of the above-described embodiments, the sampling cycle T when the sampling condition is changed
Although i and the addition of collected data were explained as only one step,
Needless to say, it is possible to switch in multiple stages by combining similar algorithms.

[0041]

According to the data collecting apparatus of the present invention, the sampling means for sampling the measured data such as the input current value and the electric energy in a predetermined cycle, the CPU for processing the sampling data, and the calculation by the CPU. In a data collection device provided with a data storage means for storing processed data, a sampling condition setting means for setting a sampling condition based on the data processing result of the CPU is provided, and the value of the input measurement data is a predetermined value. When it exceeds, the sampling condition is changed by the sampling condition setting means, so the data is saved in the data saving means when the measured data does not exceed the predetermined value or when the measuring device does not operate. Do not lengthen the sampling cycle and increase the storage capacity of the data storage unit. In addition, when data exceeding a predetermined value results in a saving by shortening the sampling period, without reducing the accuracy, data collection is possible.

The data collecting apparatus according to the present invention also includes
Data including sampling means for sampling measured data such as input current value and electric energy in a predetermined cycle, a CPU for processing the sampling data, and a data storage means for storing the data processed by the CPU The collecting device is provided with a data temporary storage means for temporarily storing the sampled measurement data and a sampling condition setting means for setting sampling conditions according to the data processing result of the CPU, and the data is stored in the data temporary storage means. Since the sampling conditions are changed based on the rate of change between the previous sampling data and the sampling data stored thereafter, when the measured data hardly changes or when the measuring device does not operate. Is the sampling frequency for storing the data in the data storage means. And the storage capacity of the data storage means are not increased, and when the rate of change of data is large, the sampling condition is changed so that the data is stored with a short sampling period, resulting in a decrease in accuracy. Without, data can be collected.

The data collecting apparatus according to the present invention also includes
Data including sampling means for sampling measured data such as input current value and electric energy in a predetermined cycle, a CPU for processing the sampling data, and a data storage means for storing the data processed by the CPU The collecting device is provided with sampling condition setting means for setting sampling conditions based on the data processing result of the CPU, and when the value of the input measurement data exceeds a predetermined value, the sampling means measures other measurement data. Since the data is stored in the data storage means, the amount of data to be stored in the data storage means is limited when the measured data does not exceed a predetermined value or when the measuring device does not operate. It is not necessary to increase the storage capacity of the device, and when the data exceeds a specified value. Results to be saved by adding measures other necessary data, efficient data collection saving use area of the data storage means is possible.

The data collecting apparatus according to the present invention also includes
Data including sampling means for sampling measured data such as input current value and electric energy in a predetermined cycle, a CPU for processing the sampling data, and a data storage means for storing the data processed by the CPU The collecting device is provided with a data temporary storage means for temporarily storing the sampled measurement data and a sampling condition setting means for setting sampling conditions according to the data processing result of the CPU, and the data is stored in the data temporary storage means. When the rate of change between the previous sampling data and the subsequently stored sampling data exceeds a predetermined value, other measurement data is measured by the sampling means and saved in the data saving means. The data to be measured hardly changes, or when the measuring device is not operating. In other words, the amount of data to be stored in the data storage means is limited, and the storage capacity of the data storage means is not increased, and when the data change rate is large, other necessary data is additionally measured and stored. As a result, it is possible to collect data efficiently while saving the use area of the data storage means.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the first embodiment.

FIG. 3 is a time chart showing the operation of the first embodiment.

FIG. 4 is a block diagram showing a configuration of a second embodiment of the present invention.

FIG. 5 is a flowchart showing the operation of the second embodiment.

FIG. 6 is a time chart showing the operation of the second embodiment.

FIG. 7 is a flowchart showing the operation of the third embodiment.

FIG. 8 is a time chart showing the operation of the third embodiment.

FIG. 9 is a flowchart showing the operation of the fourth embodiment.

FIG. 10 is a time chart showing the operation of the fourth embodiment.

FIG. 11 is a block diagram showing a configuration of a conventional data collection device.

[Explanation of symbols]

1 measuring device, 2 input means, 3, 3A,
3B data collection means, 4 output devices, 31
Input port, 32 sampling means, 33
CPU, 34 memory, 35 output port, 36 data storage means, 37 sampling condition setting means, 38 data temporary storage means.

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2F070 AA01 CC01 CC11 EE15 FF13                       HH08                 2F076 BA01 BA16 BD07 BD11 BD14                       BE04 BE05                 5H223 AA01 AA19 BB01 BB08 DD07                       EE06

Claims (6)

[Claims] 1. A sampling means for sampling measured data such as an input current value and electric energy in a predetermined cycle, a CPU for arithmetically processing the sampling data, and a data storage means for storing the data arithmetically processed by the CPU. And a sampling condition setting means for setting a sampling condition based on the data processing result of the CPU, and when the value of the input measurement data exceeds a predetermined value, the sampling condition is set. A data collection device characterized in that a sampling condition is changed by a setting means. 2. The data collecting apparatus according to claim 1, wherein the sampling condition is changed by shortening the sampling cycle. 3. A sampling means for sampling measured data such as an input current value and electric energy at a predetermined cycle, a CPU for arithmetically processing the sampling data, and a data storage means for storing the data arithmetically processed by the CPU. In a data collection device comprising: a data temporary storage means for temporarily storing sampled measurement data;
Sampling condition setting means for setting sampling conditions according to the data processing result of the CPU is provided, and based on the rate of change between the previous sampling data stored in the data temporary storage means and the sampling data stored thereafter. The data collection device is characterized in that the sampling conditions are changed. 4. The data collecting apparatus according to claim 3, wherein the sampling condition is changed by shortening the sampling period when the change rate exceeds a predetermined value. 5. A sampling means for sampling measured data such as an input current value and electric energy at a predetermined cycle, a CPU for arithmetically processing the sampling data, and a data storage means for storing the data arithmetically processed by the CPU. And a sampling condition setting means for setting a sampling condition based on the data processing result of the CPU, and the sampling means when the value of the input measurement data exceeds a predetermined value. A data collection device, characterized in that other measurement data is measured by means of and is stored in the data storage means. 6. A sampling means for sampling input measurement data such as a current value and electric energy at a predetermined cycle, a CPU for arithmetically processing the sampling data, and a data storage means for storing the data arithmetically processed by the CPU. In a data collection device comprising: a data temporary storage means for temporarily storing sampled measurement data;
Sampling condition setting means for setting sampling conditions according to the data processing result of the CPU is provided, and the rate of change between the previous sampling data stored in the data temporary storage means and the sampling data stored thereafter is predetermined. When exceeding the value, another measurement data is measured by the sampling means and saved in the data saving means.