WO2019049199A1

WO2019049199A1 - Data display system, display device, and data display method

Info

Publication number: WO2019049199A1
Application number: PCT/JP2017/031918
Authority: WO
Inventors: 佑磨林; 正孝家田
Original assignee: 三菱電機株式会社
Priority date: 2017-09-05
Filing date: 2017-09-05
Publication date: 2019-03-14
Also published as: JPWO2019049199A1

Abstract

This data display system for displaying data comprises: a controller for generating a plurality of sets of measurement data by receiving a measurement signal measured for an object of measurement and sampling the measurement signal using a plurality of different sampling frequencies and a plurality of different sampling times; and a display device for displaying the plurality of sets of measurement data (350a, 350b) generated by the controller such that the time axes of the sets of measurement data are aligned and the sets of measurement data overlap.

Description

Data display system, display device and data display method

The present invention relates to a data display system that displays measured data, a display device, and a data display method.

In recent years, systems for collecting and analyzing various data have been developed. Among such systems, a data display system that collects and displays data of a sudden phenomenon has a limited data storage area, so when acquiring data for a long time, data is acquired at a slow sampling frequency. Need to collect. Also, when detailed data is needed, the data display system needs to collect data at a fast sampling frequency.

However, at a low sampling frequency, the data display system can not acquire detailed data before and after a sudden phenomenon, and at a high sampling frequency, data can not be acquired for a long time due to factors such as storage area or processing speed. For this reason, it is desirable to collect and display both low speed sampling frequency data and high speed sampling frequency data.

The waveform measurement system described in Patent Document 1 displays data of low-speed sampling frequency and data of high-speed sampling frequency, which are data of different time axes, separately and separately displaying one screen. .

JP 2007-024838 A

However, according to Patent Document 1 which is the above-mentioned prior art, since data of different sampling frequencies are displayed on the screen after the screen is divided, a wide screen is required for data display. For this reason, there existed a problem that data display became inefficient.

The present invention has been made in view of the above, and it is an object of the present invention to obtain a data display system capable of efficiently displaying data of different sampling frequencies.

In order to solve the problems described above and to achieve the object, the data display system of the present invention samples measurement signals measured from a measurement target at a plurality of different sampling frequencies and a plurality of different sampling times to obtain a plurality of measurement data And a display device for displaying a plurality of measurement data superimposed on a time axis.

The data display system according to the present invention has an effect that data of different sampling frequencies can be displayed efficiently.

A diagram showing a data display system according to an embodiment of the present invention Block diagram showing the configuration of the display device according to the embodiment Flow chart showing data display processing procedure by the data display system according to the embodiment The figure which shows the example of the whole waveform of the measurement data corresponding to a measurement signal concerning embodiment. Diagram showing measurement data obtained by low-speed sampling according to the embodiment Diagram showing measurement data obtained by high-speed sampling according to the embodiment A diagram in which measurement data acquired by low-speed sampling according to the embodiment and measurement data acquired by high-speed sampling according to the embodiment are superimposed and displayed The figure which expanded and displayed the measurement data of low speed sampling concerning an embodiment The figure which expanded and displayed the measurement data of high speed sampling concerning an embodiment A figure showing an example of hardware constitutions of a display control part concerning an embodiment

Hereinafter, a data display system, a display device, and a data display method according to an embodiment of the present invention will be described in detail based on the drawings. The present invention is not limited by the embodiment.

Embodiment.
FIG. 1 is a diagram showing a data display system according to an embodiment of the present invention. The data display system 10 is a system that collects and displays measurement data, and can collect and display measurement data when a sudden phenomenon occurs. The data display system 10 of the embodiment superimposes and displays measurement data sampled at different sampling frequencies. The data display system 10 displays measurement data of different sampling frequencies on the same time axis by adjusting the time axis of measurement data sampled at different sampling frequencies.

The data display system 10 measures a measurement object and generates a measurement signal 36 as a measurement result, and a signal generation unit generates a reference signal 37 when a specific condition such as generation of the measurement signal 36 is satisfied. It has 12 and. An example of a particular condition is the occurrence of a catastrophic event.

The measurement unit 11 has a signal detection function such as a sensor, and generates a measurement signal 36 using the signal detection function. One example of the measurement target is a motor drive system which is a system for driving a motor, and one example of the measurement signal 36 is a signal obtained by measurement of temperature or a signal obtained by measurement of rotational speed. The reference signal 37 is a signal serving as a reference of waveform display corresponding to sampling. The data display system 10 displays the data so that the data of the timing corresponding to the reference signal 37 is included.

In addition, the data display system 10 sets the sampling frequency when the

measurement data

35a and 35b are sampled, the sampling frequency setting units 13a and 13b, and the

measurement data

35a and 35b from the measurement signal 36 based on the set sampling frequency. And the controller 14 which produces | generates. Moreover, the data display system 10 is provided with the display apparatus 20 which displays

measurement data

35a, 35b.

The

measurement data

35 a and 35 b are data generated using the measurement signal 36. The sampling frequency is a frequency at which the

measurement data

35 a and 35 b are sampled from the measurement signal 36. That is, the sampling frequency indicates a period for sampling the

measurement data

35a and 35b, and is represented by the number of samplings per unit time.

The measurement unit 11 is connected to the controller 14 and the signal generation unit 12, and transmits the measurement signal 36 to the controller 14 and the signal generation unit 12. The signal generator 12 determines, based on the measurement signal 36, whether a specific condition is satisfied. When the measurement signal 36 exceeds the threshold, the signal generation unit 12 determines that a specific condition is satisfied, and generates a reference signal 37. The threshold used by the signal generator 12 is set by, for example, the user. This threshold value is preset based on the measurement signal 36 measured when an abnormal condition such as a sudden phenomenon occurs in the measurement object. The signal generator 12 is connected to the controller 14 and transmits the generated reference signal 37 to the controller 14.

The signal generation unit 12 may determine that the specific condition is satisfied based on the information other than the measurement signal 36. In addition, the signal generation unit 12 may generate the reference signal 37 based on information other than the measurement signal 36. The signal generation unit 12 may generate the reference signal 37 at a timing instructed by the user, or may generate the reference signal 37 when a specific time comes.

The sampling frequency setting unit 13 a is connected to the controller 14 and sets the first sampling frequency in the controller 14. The sampling frequency setting unit 13 b is connected to the controller 14 and sets the second sampling frequency in the controller 14.

The second sampling frequency is a sampling frequency faster than the first sampling frequency. In other words, the second sampling frequency is higher than the first sampling frequency. That is, the first sampling frequency is lower in data sampling frequency than the second sampling frequency. In the following description, the first sampling frequency is referred to as a low speed sampling frequency, and the second sampling frequency is referred to as a high speed sampling frequency. Thus, slow sampling is sampling at a slow sampling frequency and fast sampling is sampling at a fast sampling frequency.

The controller 14 generates measurement data 35a from the measurement signal 36 based on the low speed sampling frequency. In other words, the controller 14 samples the measurement signal 36 at the slow sampling frequency and generates measurement data 35 a using the sampled measurement signal 36. The measurement data 35a is data sampled at a low speed sampling frequency, and is low speed sampling data described later.

Similarly, the controller 14 generates measurement data 35 b from the measurement signal 36 based on the high speed sampling frequency. In other words, the controller 14 samples the measurement signal 36 at a high speed sampling frequency, and generates measurement data 35 b using the sampled measurement signal 36. The measurement data 35 b is data sampled at a high speed sampling frequency, and is high speed sampling data described later. As described above, the controller 14 which is a sampling unit of the measurement signal 36 samples the measurement signal 36 at a plurality of different sampling frequencies to generate the

measurement data

35 a and 35 b.

The controller 14 transmits the generated

measurement data

35 a and 35 b to the display device 20. In addition, the controller 14 transmits the reference signal 37 received from the signal generation unit 12 to the display device 20.

The display device 20 is a device that displays the

measurement data

35a and 35b. An example of the display device 20 is a liquid crystal monitor. The display device 20 displays later-described measurement data 350a which is data from the first time to the second time in the measurement data 35a. The display device 20 also displays later-described measurement data 350b which is data from the third time to the fourth time in the measurement data 35b. The period from the third time to the fourth time is a period shorter than the period from the first time to the second time, and is included in the period from the first time to the second time. There is.

The first time is a time before the time when the reference signal 37 is generated, and the second time is a time after the time when the reference signal 37 is generated. The third time is a time before the time when the reference signal 37 is generated, and the fourth time is a time after the time when the reference signal 37 is generated.

The first time is a time before the third time, and the second time is a time after the fourth time. Thus, the order of earlier time is the order of the first time, the third time, the time when the reference signal 37 is generated, the fourth time, and the second time.

Therefore, the display device 20 displays the measurement data 350a from the first time to the third time, displays both of the

measurement data

350a and 350b from the third time to the fourth time, and The measurement data 350 a is displayed from time 4 to time 2.

As described above, the measurement data 350a, which is the first measurement data, is data sampled at the low speed sampling frequency and the first sampling period from the first time to the second time. The measurement data 350b, which is the second measurement data, is data sampled at a high-speed sampling frequency and a second sampling period from the third time to the fourth time.

The display device 20 according to the embodiment displays the waveforms of the

measurement data

350a and 350b in an overlapping manner. Specifically, the display device 20 displays the

measurement data

350a and 350b on the same time axis by adjusting the time axis of the

measurement data

350a and 350b.

The display device 20 displays the

measurement data

350 a and 350 b such that the time when the reference signal 37 of the measurement data 350 a is generated and the time when the reference signal 37 of the measurement data 350 b is generated coincide with each other. As described above, the display device 20 superimposes and displays the

measurement data

350a and 350b acquired at different sampling frequencies on the same time axis. Specifically, when the display device 20 receives the reference signal 37, the display device 20 sets timing K0, which will be described later, which is a timing at which the reference signal 37 is generated, as a display reference, and displays the

measurement data

350a and 350b in an overlapping manner.

Here, the configuration of the display device 20 will be described. FIG. 2 is a block diagram showing the configuration of the display device according to the embodiment. The display device 20 includes an input unit 21 that receives

measurement data

35a and 35b from the controller 14 and inputs the

measurement data

35a and 35b to the display control unit 23, and a storage unit 22 that stores the

measurement data

35a and 35b.

In addition, the display device 20 generates the

measurement data

350a and 350b using the

measurement data

35a and 35b in the storage unit 22, and causes the display control unit 23 to display the measurement data on the display unit 24, and a display unit that displays the

measurement data

350a and 350b. It has 24 and.

The input unit 21 is connected to the controller 14, and receives the

measurement data

35 a and 35 b and the reference signal 37 from the controller 14. The input unit 21 inputs the

measurement data

35 a and 35 b and the reference signal 37 to the display control unit 23.

The display control unit 23 stores the

measurement data

35 a and 35 b and the reference signal 37 in the storage unit 22. The display control unit 23 also generates

measurement data

350 a and 350 b from the

measurement data

35 a and 35 b in the storage unit 22 based on the reference signal 37. The display control unit 23 causes the display unit 24 to display the generated

measurement data

350 a and 350 b in an overlapping manner.

The display control unit 23 displays the

measurement data

350 a and 350 b on the display unit 24 after aligning the time axis of the measurement data 350 a and the time axis of the measurement data 350 b. The

measurement data

350 a and 350 b displayed on the display unit 24 by the display control unit 23 include measurement data of the timing K 0 corresponding to the reference signal 37. The display unit 24 superimposes and displays the

measurement data

350 a and 350 b as shown in FIG. 7 described later according to an instruction from the display control unit 23.

The storage unit 22 stores the

measurement data

35a and 35b and the reference signal 37. The storage unit 22 stores the

measurement data

35a and 35b using a ring buffer. At this time, the storage unit 22 stores the measurement data 35a in the first ring buffer, and stores the measurement data 35b in the second ring buffer. In other words, the storage unit 22 separately stores the

measurement data

35a and 35b in different ring buffers. An example of the storage unit 22 is a memory.

Below, the data display processing procedure by the data display system 10 is demonstrated. FIG. 3 is a flowchart showing a data display processing procedure by the data display system according to the embodiment.

In the data display system 10, the measurement unit 11 measures an object to be measured and generates a measurement signal 36 which is a measurement result. Then, the measurement unit 11 transmits the measurement signal 36 to the controller 14.

Then, in step S10, the data display system 10 generates measurement data 35a of the low speed sampling frequency. Specifically, the controller 14 of the data display system 10 generates measurement data 35a from the measurement signal 36 based on the low-speed sampling frequency set by the sampling frequency setting unit 13a.

Further, in step S20, the data display system 10 generates measurement data 35b of high-speed sampling frequency. Specifically, the controller 14 of the data display system 10 generates measurement data 35 b from the measurement signal 36 based on the high-speed sampling frequency set by the sampling frequency setting unit 13 b.

In the example of the low speed sampling frequency in step S10 described above, the cycle of sampling the measurement data 35a is once in several cycles, and in the example of the high speed sampling frequency in step S20 described above, the cycle of sampling the measurement data 35b is every It is a cycle. Thus, the fast sampling frequency is higher in data sampling frequency than the slow sampling frequency.

The controller 14 transmits the generated

measurement data

35 a and 35 b to the display device 20. Thereby, the display device 20 stores the measurement data 35a in the first ring buffer, and stores the measurement data 35b in the second ring buffer.

The controller 14 generates the measurement data 35 b while generating the measurement data 35 a. Further, the controller 14 transmits the measurement data 35 b to the display device 20 while transmitting the measurement data 35 a to the display device 20.

While the controller 14 generates and transmits the

measurement data

35a and 35b, in step S30, the signal generation unit 12 determines whether a specific condition is satisfied. If the specific condition is not satisfied, that is, in the case of No in step S30, the data display system 10 repeats the processing of steps S10 to S30. The data display system 10 repeats the processes of steps S10 to S30 until the signal generation unit 12 determines that the specific condition is satisfied. In other words, the data display system 10 continues to determine whether a specific condition is satisfied while generating and transmitting the

measurement data

35a and 35b.

When the specific condition is satisfied, that is, in the case of Yes in step S30, in step S40, the data display system 10 measures the measurement data 350a among the measurement data 35a which is low speed sampling data and the measurement data 35b which is high speed sampling data. The measurement data 350b of the above are displayed overlappingly as shown in FIG. 7 described later.

The data display system 10 does not have to display the

measurement data

350a and 350b immediately after generating the

measurement data

350a and 350b, and temporarily stores the

measurement data

350a and 350b and then reads the

measurement data

350a and 350b. May be displayed. In this case, the storage unit 22 of the display device 20 stores the

measurement data

350a and 350b, and the display control unit 23 reads the

measurement data

350a and 350b at the timing instructed by the controller 14 and causes the display unit 24 to display it. . Further, the storage unit 22 of the display device 20 stores the

measurement data

35a and 35b, and the display control unit 23 reads the

measurement data

35a and 35b at the timing instructed by the controller 14 and generates the

measurement data

350a and 350b. It may be displayed on the display unit 24.

FIG. 4 is a diagram showing an example of the entire waveform of measurement data corresponding to the measurement signal according to the embodiment. The horizontal axis in FIG. 4 is the sampling time, and the vertical axis is the level of the measurement data 51. Measurement data 51 shown in FIG. 4 is data before being sampled by the controller 14. In other words, data generated using all of the measurement signals 36 is the measurement data 51. Therefore, data sampled from the measurement data 51 at the low speed sampling frequency becomes the measurement data 35 a, and data sampled from the measurement data 51 at the high speed sampling frequency becomes the measurement data 35 b.

Assuming that the low-speed sampling frequency set by the sampling frequency setting unit 13a is the frequency F1, the controller 14 samples the measurement data 51 at the frequency F1 to generate the measurement data 35a.

Further, assuming that the high-speed sampling frequency set by the sampling frequency setting unit 13b is a frequency F2, the controller 14 samples the measurement data 51 at the frequency F2 to generate the measurement data 35b.

The controller 14 continues to transmit the generated

measurement data

35 a and 35 b to the display device 20. The storage unit 22 of the display device 20 stores, in the first ring buffer, measurement data 35a for the measurement time T1 which is the first sampling period. That is, the storage unit 22 stores the measurement data 35a for the measurement time T1 sampled at the frequency F1 in the first ring buffer.

In addition, the storage unit 22 of the display device 20 stores, in the second ring buffer, measurement data 35b for the measurement time T2 that is the second sampling period. That is, the storage unit 22 stores the measurement data 35b for the measurement time T2 sampled at the frequency F2 in the second ring buffer. When the controller 14 receives the reference signal 37 from the signal generator 12, the controller 14 transmits the reference signal 37 to the display device 20.

In the embodiment, the relationship of T1> T2 and the relationship of F2> F1 are set in the display control unit 23. Therefore, the display control unit 23 stores measurement data 350 a for a long time by low speed sampling, and stores measurement data 350 b for a short time by high speed sampling. The measurement data 350a is at least a part of the measurement data 35a, and the measurement data 350b is at least a part of the measurement data 35b. Thus, the display control unit 23 stores measurement data 350a of rough time intervals obtained by low speed sampling for a long time, and stores measurement data 350b of fine time intervals obtained by high speed sampling for a short time. The magnitude relationship between the measurement time T1 and the measurement time T2 is not limited to the above-described example, and the magnitude relationship between the frequency F2 and the frequency F1 is not limited to the above-described example.

When the display control unit 23 receives the reference signal 37, the display control unit 23 causes the display unit 24 to display the

measurement data

350a and 350b. Specifically, the display control unit 23 causes the display unit 24 to display the

measurement data

350a and 350b so that the

measurement data

350a and 350b at the timing K0, which is the timing at which the reference signal 37 is generated, is included. Therefore, the display control unit 23 generates the

measurement data

350a and 350b such that the measurement time T1 and the measurement time T2 include the timing K0. Since the timing K0 is the timing at which the reference signal 37 is generated, it is the timing at which a specific condition is satisfied.

The reference signal 37 is a signal generated when a system such as a motor drive system detects any abnormal condition. Therefore, the timing K0 is the timing at which a system such as a motor drive system generates an abnormal state.

FIG. 5 is a diagram showing measurement data obtained by low-speed sampling according to the embodiment. The horizontal axis in FIG. 5 is the sampling time, and the vertical axis is the level of the measurement data 350a. In FIG. 5, low-speed sampling measurement data 350a is indicated by data points 360a. In FIG. 5, the measurement data 350a for the measurement time T1 is shown by a line graph.

The measurement data 350a includes one data point 360a every reference time Tx. Therefore, in FIG. 5, the measurement data 350a for each reference time Tx among the measurement data 51 is displayed. Since the measurement data 350a is low-speed sampling, the display device 20 can acquire data for a long time.

FIG. 6 is a view showing measurement data obtained by high-speed sampling according to the embodiment. The horizontal axis in FIG. 6 is the sampling time, and the vertical axis is the level of the measurement data 350b. In FIG. 6, high-speed sampling measurement data 350b is indicated by data points 360b. In FIG. 6, the measurement data 350b for the measurement time T2 is shown by a line graph.

Measurement data 350 b includes four data points 360 b for each reference time Tx. The measurement data 350b is sampled at a higher speed than the measurement data 350a, so the display device 20 can acquire data of the measurement data 350b more detailed than the measurement data 350a.

FIG. 7 is a diagram in which measurement data acquired by low-speed sampling according to the embodiment and measurement data acquired by high-speed sampling according to the embodiment are superimposed and displayed. FIG. 7 shows the case where the measurement data 350a shown in FIG. 5 and the measurement data 350b shown in FIG. 6 are superimposed and displayed. When the display control unit 23 receives the reference signal 37, the display control unit 23 generates

measurement data

350a and 350b in a time range including the timing K0 corresponding to the reference signal 37.

Specifically, the display control unit 23 generates measurement data 350a for the measurement time T1 and generates measurement data 350b for the measurement time T2. Then, the display control unit 23 causes the display unit 24 to display the superposition of the

measurement data

350a and 350b such that the timing K0 of the measurement data 350a and the timing K0 of the measurement data 350b coincide. In this case, the display control unit 23 adjusts the time axis so that the reference time Tx of the measurement data 350a and the reference time Tx of the measurement data 350b have the same length, and then performs measurement on the same graph. The

data

350 a and 350 b are displayed on the display unit 24. Thereby, the display unit 24 displays the measurement data 350a obtained by the low speed sampling and the measurement data 350b obtained by the high speed sampling on the screen so as to include the timing K0.

Thus, the display unit 24 displays the entire waveform with the measurement data 350a, and displays the detailed waveform at the timing K0 with the measurement data 350b. Thus, the user of the data display system 10 can grasp the entire waveform and can grasp the detailed waveform at the timing K0. The display unit 24 can magnify and display the waveforms of the

measurement data

350a and 350b. Since the conventional display divided the whole waveform and part of the waveform and displayed it on a plurality of screens, the user had to grasp the situation corresponding to the waveform by viewing the plurality of screens. For this reason, it was difficult to grasp where and in what circumstances the abnormality occurred in the whole. On the other hand, in the present embodiment, since the entire waveform and the detailed waveform at timing K0 are simultaneously displayed on one screen, it is intuitive to know where and how the abnormality occurred in the whole. It is possible to

FIG. 8 is an enlarged view of measurement data of low speed sampling according to the embodiment. FIG. 8 shows measurement data 351a which is a part of the waveform of the measurement data 350a. The measurement data 351a shown in FIG. 8 is a part of the section A1 of the measurement data 350a shown in FIG. Since the section A1 has only the low-speed sampled measurement data 350a, the display unit 24 can not display a detailed waveform, but displays various measurement data 350a by changing the section A1 to various times. Can. That is, the display unit 24 can magnify and display the measurement data 350a in any section during the measurement time T1.

FIG. 9 is an enlarged view of measurement data of high-speed sampling according to the embodiment. FIG. 9 shows measurement data 351b which is a part of the waveform of the measurement data 350b. The measurement data 351b shown in FIG. 9 is a part of the section A2 of the measurement data 350b shown in FIG. Since the section A2 includes the high-speed sampled measurement data 350b, the display unit 24 can display a detailed waveform in the section A2. The display unit 24 can magnify and display any measurement data 350b during the measurement time T2. Thereby, the user can perform detailed analysis in the section A2.

The display device 20 determines the sections A1 and A2 according to an instruction from the user, and displays the

measurement data

351a and 351b. The instruction from the user may be received directly by the input unit 21, or may be received by the input unit 21 via another component such as the controller 14. The display control unit 23 causes the display unit 24 to display the

measurement data

351a and 351b in accordance with the instruction from the user accepted by the input unit 21.

As described above, the display unit 24 can display both the

measurement data

350a and 351a having a long time such as the measurement time T1 and the

measurement data

350b and 351b which are detailed data. In the embodiment, the display device 20 displays the

measurement data

350a and 350b of two types of sampling frequencies in an overlapping manner, but the display device 20 overlaps measurement data of three or more types of sampling frequencies. May be displayed.

As described above, in the embodiment, since the display device 20 displays waveforms of a plurality of sampling frequencies in an overlapping manner, the display device 20 displays a plurality of sampling frequencies without performing special operations such as screen division or waveform switching. The waveform can be displayed.

Here, the hardware configuration of the display control unit 23 will be described. FIG. 10 is a diagram illustrating an example of a hardware configuration of a display control unit according to the embodiment. The display control unit 23 can be realized by the control circuit 300 shown in FIG. 10, that is, the processor 301 and the memory 302. An example of the processor 301 is a CPU (Central Processing Unit, central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, processor, also referred to as DSP) or a system LSI (Large Scale Integration). An example of the memory 302 is a random access memory (RAM) or a read only memory (ROM).

The display control unit 23 is realized by the processor 301 reading out and executing a program for executing the operation of the display control unit 23 stored in the memory 302. Also, it can be said that this program causes a computer to execute the procedure or method of the display control unit 23. The memory 302 is also used as a temporary memory when the processor 301 executes various processes.

Thus, the program executed by the processor 301 is a computer-executable computer-program product having a computer-readable non-transitory recording medium including a plurality of instructions for performing data processing. is there. The program executed by the processor 301 causes the computer to execute data processing of a plurality of instructions.

In addition, the display control unit 23 may be realized by dedicated hardware. In addition, a part of the function of the display control unit 23 may be realized by dedicated hardware and a part may be realized by software or firmware.

In the embodiment, the display device 20 displays the line graph which is the waveform of the

measurement data

350a and 350b. However, the graph displayed by the display device 20 is not limited to the line graph. The graph displayed by the display device 20 may be a bar graph or an area graph. Further, the graph displayed by the display device 20 may be a graph generated by approximating a line graph. In other words, the display device 20 may display an approximate graph obtained by smoothing the line graph. Regardless of whether the graph displayed by the display device 20 is a bar graph, an area graph, or an approximate graph, the display device 20 displays a plurality of types of data with different sampling frequencies in an overlapping manner.

Further, the frequency F2, which is the high-speed sampling frequency, is most preferably an integral multiple of the frequency F1, which is the low-speed sampling frequency, but is not limited to the integer multiple. The relationship between the frequency F2 and the frequency F1 may be disjoint from each other. Further, the relationship between the frequency F2 and the frequency F1 is not limited to the integer ratio, and any ratio relationship may be used.

Also, when the reference signal 37 is generated at a timing K0 at which a system such as a motor drive system detects an abnormal state, the

measurement data

350a and 350b are useful for analyzing the cause of the abnormal state. The conditions under which the reference signal 37 is generated are not limited to the conditions described in the embodiment, and any conditions can be applied.

As described above, according to the embodiment, the display device 20 displays the

measurement data

350a and 350b of different sampling frequencies in an overlapping manner with their time axes aligned. Therefore, it is effective in the ability to display the

measurement data

350a and 350b of different sampling frequency efficiently. Further, the long-term measurement data 350a and the detailed measurement data 350b can be displayed on the same time axis.

In addition, since the display device 20 displays the

measurement data

350a and 350b after matching the timing K0, the

measurement data

350a and 350b can be overlapped and displayed after the time axis is accurately aligned.

In addition, the data display system 10 generates the reference signal 37 when the measurement signal 36 exceeds the threshold, sets the timing K0 corresponding to the reference signal 37 as the reference of display, and overlaps the

measurement data

350a and 350b. Since the display is made, it becomes possible to display the

measurement data

350a and 350b at an appropriate timing K0 according to the condition of the object to be measured.

The configuration shown in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and one of the configurations is possible within the scope of the present invention. Parts can be omitted or changed.

Reference Signs List 10 data display system 11 measurement unit 12 signal generation unit 13a and 13b sampling frequency setting unit 14 controller 20 display device 21 input unit 22 storage unit 23 display control unit 24

display unit

35a and 35b 51 measurement data, 36 measurement signals, 37 reference signals, 350a, 350b, 351a, 351b measurement data, 360a, 360b data points.

Claims

A sampling unit that samples a measurement signal measured from a measurement target at a plurality of different sampling frequencies and a plurality of different sampling times to generate a plurality of measurement data;
A display device for displaying the plurality of measurement data superimposed on each other with their time axes aligned;
A data display system comprising:
The plurality of measurement data are
First measurement data sampled at a first sampling frequency and a first sampling period;
Second measurement data sampled in a second sampling period faster than the first sampling frequency and a second sampling period shorter than the first sampling period;
including,
The data display system according to claim 1, characterized in that:
The first sampling period and the second sampling period include timing when a specific condition is established,
The display device matches the timing of the first measurement data and the timing of the second measurement data, and then superimposes the first measurement data and the second measurement data. indicate,
The data display system according to claim 2, characterized in that:
The signal generation unit further includes a signal generation unit that generates a reference signal indicating that the timing is determined by determining that the specific condition is satisfied when the measurement signal exceeds a threshold.
When the display device receives the reference signal, the display device sets the timing as a reference of display and displays the first measurement data and the second measurement data in an overlapping manner.
The data display system according to claim 3, characterized in that:
The measurement target is a motor drive system that drives a motor,
The threshold is a value set based on a measurement signal measured when the motor drive system is in an abnormal state.
The data display system according to claim 4, characterized in that:
An input unit that receives a plurality of measurement data generated by sampling a measurement signal measured from a measurement target at a plurality of different sampling frequencies and a plurality of different sampling times;
A display unit which displays the plurality of measurement data in an overlapping manner on the same time axis;
A display device comprising:
Generating a plurality of measurement data by sampling the measurement signal measured from the measurement object at a plurality of different sampling frequencies and a plurality of different sampling times;
Displaying the plurality of measurement data superimposed on the same time axis;
A data display method characterized by including: