JP5543324B2 - Waveform analyzer - Google Patents

Description

  The present invention relates to a waveform analysis apparatus, and more particularly to a waveform analysis apparatus capable of analyzing waveform data even during measurement execution.

  Waveform analyzers typified by digital oscilloscopes and data recorders measure the signal under measurement, store it as waveform data in a storage device such as a hard disk, and analyze the waveform data to determine the measured waveforms and analysis results. Is displayed on the display device in the following format.

  FIG. 8 is a block diagram showing a configuration of a conventional waveform analysis apparatus. As shown in the figure, the conventional waveform analysis apparatus 300 includes a measurement unit 310, an acquisition memory 320, a file processing unit 330, a waveform analysis processing unit 340, a hard disk 350, and a display unit 360.

  The measurement unit 310 receives a signal under measurement, performs measurement according to measurement conditions, and outputs waveform data as a measurement result. The acquisition memory 320 is a volatile high-speed memory, and temporarily stores the waveform data output from the measurement unit 310. Since the acquisition memory 320 records waveform data in a ring buffer structure, old waveform data is sequentially overwritten with new waveform data.

  The file processing unit 330 includes a waveform data storage processing unit 331 and a waveform data read processing unit 332. The waveform data storage processing unit 331 stores the waveform data stored in the acquisition memory 320 as the waveform data file 200 in the hard disk 350. At this time, accompanying information that is information about the waveform data is created and added to the waveform data file 200. The waveform data read processing unit 332 reads the waveform data file 200 stored in the hard disk 350 and sends it to the waveform analysis processing unit 340.

  The waveform analysis processing unit 340 creates display data based on the waveform data recorded in the waveform data file 200 or performs waveform analysis calculation to display on the display unit 360.

  FIG. 9 is a diagram showing the structure of the waveform data file 200 stored in the hard disk 350. As shown in FIG. 9A, the waveform data file 200 includes a waveform raw data area and an accompanying information area. The waveform raw data area is an area where waveform raw data, which is a digitally converted measurement value, is stored in time series. The accompanying information area is an area where accompanying information is stored, and includes a waveform display data area, a waveform address data area, and a measurement condition data area.

  The waveform display data area is an area for storing waveform display data subjected to peak-to-peak compression. In recent years, the number of measurement points of waveform data may exceed several gigapoints, and if waveform display is performed using waveform raw data, it takes a lot of time for file access. For this reason, waveform display data obtained by thinning out the number of data points is prepared for waveform display.

  The waveform address data area is an area for storing waveform address data, which is index information for speeding up access to waveform raw data. The waveform address data indicates, for example, where and what point of data is recorded.

  The measurement condition data area is an area for storing measurement conditions such as the measured sample rate, the number of measurement points, the measurement start time, and the measurement end time, and measurement condition data that is information about the data. The accompanying information includes the above waveform display data, waveform address data, and measurement condition data.

  As the number of waveform data measurement points increases, the file capacity of the waveform data file 200 increases, which may exceed the limit imposed by the file system, and file access becomes complicated.

  For this reason, one logical file shown in FIG. 9A is divided into a plurality of files and sequentially stored in the hard disk 350 as shown in FIG. 9B. That is, a divided waveform data file is created and stored in the hard disk 350 each time raw waveform data for a predetermined time, a predetermined number, or the like is stored in the acquisition memory 320.

  In the example of this figure, it is assumed that the file is divided into 1000 files and stored in the hard disk 350 as a divided waveform data file # 1, a divided waveform data file # 2,.

  In each divided waveform data file #N, the divided raw waveform data is recorded, and accompanying information is added to the last divided waveform data file # 100. This is because the measurement conditions and the like included in the accompanying information cannot be determined unless the measurement is completed.

  The waveform data file 200 stored in the hard disk 350 is read by the waveform read processing unit 332, analyzed by the waveform analysis processing unit 340, display data is created, and displayed on the display unit 360.

  FIG. 10 is a diagram illustrating an example of a screen displayed on the display unit 360. As shown in the figure, the screen 500 includes a waveform display area 501 for displaying the measurement waveform 502, a sampling information area 503 indicating the sample rate and the number of measurement points, a time axis scale display area 504, and a measurement value axis scale display area. 505, a calculation cursor 506 for designating a waveform range to be analyzed, and an analyzed calculation result display area 507.

  In the conventional waveform analysis apparatus 300, the waveform data is analyzed in the following procedure. That is, the measurement unit 110 measures the signal under measurement, and the waveform data is transferred to the acquisition memory 320. Then, the waveform data storage processing unit 331 of the file processing unit 330 stores the divided waveform data file unit in the hard disk 350.

  When the measurement is completed and all the waveform data is obtained, the waveform data storage processing unit 331 creates accompanying information and adds it to the waveform data file 200, and the waveform data processing unit 340 stores the waveform data file 200. Notify that.

  In response to this notification, the waveform analysis processing unit 340 reads the waveform data file 200 stored in the hard disk 350 through the waveform data read processing unit 332, generates waveform display data, and executes an analysis operation. Then, the display unit 360 displays a screen as shown in FIG.

JP 2009-115547 A

  The accompanying information includes information whose value cannot be determined unless the measurement is completed. Therefore, the accompanying information is created when the measurement is completed and the waveform data is prepared. For this reason, even if the waveform data is analyzed during the measurement, the accompanying information is not created, so that the waveform display data cannot be displayed or the target waveform raw data cannot be accessed.

  Although analysis using the waveform data stored in the acquisition memory 320 is also conceivable, the acquisition memory 320 is overwritten sequentially, so that the target waveform data cannot always be referred to.

  In recent years, there has been an increase in long-time, large-capacity continuous measurement, and there is an increasing demand for analyzing waveform data during measurement. In view of the above, an object of the present invention is to enable waveform analysis to be performed in a waveform analysis apparatus even during measurement execution.

In order to solve the above-described problem, a waveform analysis apparatus according to a first aspect of the present invention includes an acquisition memory that temporarily stores waveform data continuously obtained during measurement, and a predetermined unit from the acquisition memory. reads waveform data, and a file processing section to be stored in non-volatile memory device as divided waveform data files, each of the divided waveform data files are stored, based on the stored divided waveform data files, intermediate measurement waveform data And a waveform analysis processing unit that creates intermediate accompanying information used for the analysis.

Here, the intermediate accompanying information includes access information to waveform data included in the saved divided waveform data file, information on measurement conditions of the measurement, and waveform display data of waveform data included in the saved divided waveform data file. Can contain either.

In addition, when the waveform analysis processing unit receives a waveform data analysis request before the completion of the measurement, the waveform analysis processing unit refers to the intermediate accompanying information and analyzes the waveform data included in the saved divided waveform data file. Can do.

In order to solve the above-described problem, a waveform analysis apparatus according to a second aspect of the present invention is a waveform analysis apparatus including a measurement side apparatus and an analysis side apparatus, and the measurement side apparatus continuously outputs a measurement result. An acquisition memory that temporarily stores the waveform data obtained in the above, and a file processing unit that reads out the waveform data in a predetermined unit from the acquisition memory and saves it in a nonvolatile storage device as a divided waveform data file, Each time the divided waveform data file is saved, the analysis side device includes a waveform analysis processing unit that creates intermediate accompanying information used for analysis of waveform data during measurement with reference to the saved divided waveform data file. It is characterized by that.

  According to the present invention, the waveform analysis apparatus can analyze waveform data even during measurement execution.

It is a block diagram which shows the structure of the waveform analyzer which concerns on this embodiment. It is a block diagram which shows the detailed structure of a waveform analysis process part. It is a figure for demonstrating intermediate accompanying information. It is a flowchart explaining the procedure for a waveform analyzer to start measurement and save a waveform data file. It is a flowchart explaining the procedure which produces intermediate accompanying information. It is a flowchart explaining the process of the waveform analysis apparatus when the analysis request | requirement of waveform data is received during measurement. It is a figure which shows the example of the analysis result displayed when the analysis request | requirement of waveform data is received during measurement. It is a block diagram which shows the structure of the conventional waveform analyzer. It is a figure which shows the structure of a waveform data file. It is a figure which shows the example of the screen displayed on a display part.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the waveform analysis apparatus according to this embodiment. As shown in this figure, the waveform analysis apparatus 100 according to this embodiment includes a measurement unit 110, an acquisition memory 120, a file processing unit 130, a waveform analysis processing unit 140, a hard disk 150, and a display unit 160.

  The measurement unit 110 receives a signal under measurement, performs measurement according to measurement conditions, and outputs waveform data as a measurement result. The acquisition memory 120 is a volatile high-speed memory, and temporarily stores the waveform data output from the measurement unit 110. Since the acquisition memory 120 records waveform data in a ring buffer structure, old waveform data is sequentially overwritten with new waveform data.

  The file processing unit 130 includes a waveform data storage processing unit 131 and a waveform data read processing unit 132. The waveform data storage processing unit 131 stores the waveform data stored in the acquisition memory 120 as a waveform data file 200 in the hard disk 150.

  At this time, accompanying information that is information about the waveform data is created and added to the waveform data file 200. The waveform data read processing unit 132 reads the waveform data file 200 stored in the hard disk 150 and sends it to the waveform analysis processing unit 140. The structure of the waveform data file 200 is the same as that of the conventional structure shown in FIG. 9, which is composed of a plurality of divided waveform data files, and accompanying information is added to the last divided waveform data file.

  The waveform analysis processing unit 140 creates display data based on the waveform data recorded in the waveform data file 200 or performs waveform analysis calculation to display on the display unit 160. Further, each time the waveform data storage processing unit 131 stores the divided waveform data file during the measurement, it generates intermediate accompanying information. By referring to the intermediate accompanying information, it becomes possible to analyze the waveform data even during the measurement.

  FIG. 2 is a block diagram showing a detailed configuration of the waveform analysis processing unit 140. As shown in the figure, the waveform analysis processing unit 140 includes a waveform analysis unit 141, an intermediate incidental information generation unit 142, and an intermediate incidental information memory 143.

  When receiving the waveform analysis request, the waveform analysis unit 141 performs waveform analysis using the waveform data read by the waveform data read processing unit 132, generates display data / analysis calculation data, and causes the display unit 160 to display the display data / analysis calculation data. .

  The intermediate accompanying information generation unit 142 generates intermediate accompanying information each time the waveform data storage processing unit 131 saves the divided waveform data file on the hard disk 150 and stores the intermediate accompanying information in the intermediate accompanying information memory 143. Therefore, the intermediate incidental information generation unit 142 includes a waveform display intermediate data generation unit 1421, a waveform address intermediate data generation unit 1422, and a measurement condition intermediate data generation unit 1423.

  The waveform display intermediate data generation unit 1421 generates waveform display intermediate data subjected to peak-to-peak compression for waveform data from the start of measurement to the latest divided waveform data file.

  The waveform address intermediate data generation unit 1422 generates waveform address intermediate data that is index information for speeding up access to waveform raw data for waveform data from the start of measurement to the latest divided waveform data file.

  The measurement condition intermediate data generation unit 1423 is information about the measurement conditions such as the sample rate, the number of measurement points, the measurement start time, and the measurement end time regarding the waveform data from the measurement start to the latest divided waveform data file. A certain measurement condition intermediate data is generated.

  The intermediate incidental information memory 143 includes an intermediate incidental information area 1431 for storing waveform display intermediate data, waveform address intermediate data, and measurement condition intermediate data, and a temporary storage area 1432. The intermediate accompanying information memory 143 can be a volatile storage area, but may be a nonvolatile storage area. In the latter case, even if the power supply is cut off during the measurement and the waveform data is not saved, the waveform data can be accessed and analyzed halfway.

  The intermediate accompanying information area 1431 overwrites the old intermediate accompanying information with the latest intermediate accompanying information. Since the latest intermediate incidental information includes incidental information for the waveform data from the start of measurement to the latest divided waveform data file, even if the old intermediate incidental information is overwritten, the intermediate incidental information from the start of measurement is not changed. There is no loss.

  The temporary storage area 1432 temporarily stores the latest intermediate incident information to be created when the waveform data is analyzed with reference to the intermediate incident information to be overwritten when the latest intermediate incident information is created. It is an area to do. This prevents the intermediate accompanying information being referenced from being overwritten during the analysis of the waveform data. When the analysis of the waveform data is completed, the latest intermediate accompanying information stored in the temporary storage area 1432 is transferred to the intermediate accompanying information area 1431.

  FIG. 3 is a diagram for explaining the intermediate accompanying information. In the example of this figure, intermediate accompanying information (# 1) generated after the divided waveform data file # 1 is saved and intermediate accompanying information (# 2) generated after the divided waveform data file # 2 is saved. And intermediate accompanying information (# 3) generated after the divided waveform data file # 3 is saved and intermediate accompanying information (# 999) generated after the divided waveform data file # 999 is saved. Yes. Here, it is assumed that a divided waveform data file is generated every 100 seconds (every 10,000 points).

  As shown in this figure, in the intermediate incidental information (# 1), 10,000 points of waveform display intermediate data (# 1) from the measurement start time 0 s to 100 s are recorded, and in the intermediate incidental information (# 2) , 20,000 points of waveform display intermediate data (# 2) from the measurement start time 0 s to 200 s are recorded, and 30,000 points of waveform from the measurement start time 0 s to 300 s are recorded in the intermediate accompanying information (# 3) Display intermediate data (# 3) and the like are recorded, and 9,990,000 waveform display intermediate data (# 999) and the like from the measurement start time 0 s to 99900 s are recorded in the intermediate incidental information (# 999). .

  Since the intermediate incidental information (# 1000) is the same as the incidental information created by the waveform data storage processing unit 131 after the measurement is completed, it is not necessary to generate the intermediate incidental information (# 1000). Of course, the intermediate accompanying information generation unit 142 may generate the intermediate accompanying information (# 1000), or the waveform data storage processing unit 131 refers to the intermediate accompanying information and adds the accompanying information to the waveform data file 200. Information may be created.

  Next, the procedure in which the waveform analysis apparatus 100 starts measurement and stores the waveform data file 200 will be described with reference to the flowchart of FIG. When measurement is started when the signal under measurement satisfies the trigger condition or the like, the measurement unit measures the signal under measurement and sequentially stores the waveform data in the acquisition memory 120 (S101).

  Then, when it is a predetermined time or a division timing such as every predetermined number of measurements (S102: Yes), the waveform data storage processing unit 131 of the file processing unit 130 reads out the waveform raw data stored in the acquisition memory 120 and divides the data. A waveform data file #N is generated and stored in the hard disk 150.

  When the saving of the divided waveform data file #N is completed, the waveform data saving processing unit 131 notifies the waveform analysis processing unit 140 of the completion of saving. In response to this notification, the intermediate accompanying information generation unit 142 of the waveform analysis processing unit 140 reads the latest divided waveform data file #N stored in the hard disk 150 (S104), creates intermediate accompanying information, and creates the intermediate accompanying information. The associated information memory 143 is stored (S105).

  The above processing is repeated until the measurement is completed, and when the measurement is completed (S106: Yes), the waveform data storage processing unit 131 of the file processing unit 130 creates accompanying information based on the waveform data file 200 in which the waveform data is prepared. Then, the accompanying information is added to the waveform data file 200 and stored in the hard disk 150 (S108).

  Next, the detailed procedure of the intermediate accompanying information creation processing (S105) performed by the intermediate accompanying information generation unit 142 of the waveform analysis processing unit 140 will be described with reference to the flowchart of FIG.

  When notified of the completion of saving the divided waveform data file #N, the intermediate accompanying information generation unit 142 determines whether there is a waveform data analysis request during the measurement and the waveform data file 200 is being analyzed (S1051). ). The analysis of the waveform data file 200 in the middle of measurement refers to the intermediate accompanying information stored in the intermediate accompanying information area 1431 of the intermediate accompanying information memory 143. Therefore, during the analysis, it is stored in the intermediate accompanying information area 1431. It is necessary to avoid updating the intermediate accompanying information.

  Therefore, during the analysis of the waveform data file 200 (S1051: Yes), the latest intermediate incidental information is recorded using the temporary storage area 1432 of the intermediate incidental information memory 143 (S1052). If the analysis is not in progress (S1051: No), the latest intermediate accompanying information may be recorded in the intermediate accompanying information area 1431.

  Then, based on the intermediate accompanying information before the update and the newly stored divided waveform data file #N, the waveform display intermediate data generation unit 1421 updates the waveform display intermediate data (S1053), and the waveform address intermediate data The generation unit 1422 updates the waveform address intermediate data (S1054), and the measurement condition intermediate data generation unit 1423 updates the measurement condition intermediate data (S1055). As a result, the latest intermediate accompanying information is created and stored. However, the order of these updates does not matter.

  Next, processing when the waveform analysis apparatus 100 receives a waveform data analysis request during measurement will be described with reference to the flowchart of FIG.

  When a waveform data analysis request is received during measurement, the waveform analysis unit 141 of the waveform analysis processing unit 140 refers to the intermediate incidental information area 1431 of the intermediate incidental information memory 143 and acquires measurement information intermediate data (S201). Further, the waveform address intermediate data is acquired (S202).

  Then, it is determined whether it is necessary to access the waveform raw data according to the analysis content (S203). For example, if the analysis content is to read the waveform data in the range indicated by the calculation cursor, it will be necessary to access the waveform raw data. There is no need to access.

  As a result, if it is necessary to access the waveform raw data (S203: Yes), the divided waveform data file #X is accessed based on the acquired measurement information intermediate data and waveform address intermediate data, and the necessary waveform raw data is obtained. Read (S204).

  On the other hand, if it is not necessary to access the waveform raw data (S203: No), the waveform display intermediate data is acquired by referring to the intermediate incidental information area 1431 of the intermediate incidental information memory 143 (S205).

  Then, display waveform data is generated (S206), an analysis operation according to the analysis content is performed (S207), and the waveform data and the analysis value are displayed on the display unit 160 (S208).

  FIG. 7 is a diagram illustrating an example of analysis results of waveform data during measurement. FIG. 7A shows the waveform data for 10,000 points and the analysis result after the divided waveform data file # 1 is saved, and FIG. 7B shows the divided waveform data file # 2 saved. The waveform data for 20,000 points and the analysis result after the generation are shown, and FIG. 7C shows the waveform data for 9,990,000 points after the divided waveform data file # 999 is saved. The analysis results are shown.

The above processing is repeated until the analysis request is completed, and when the analysis is completed (S209: Yes), if the temporary storage area 1432 is used ( S210 : Yes), that is, the latest intermediate attachment is being executed during the analysis execution. If the information is stored in the temporary storage area 1432, the intermediate incidental information stored in the temporary storage area 1432 is stored in the intermediate incidental information area 1431 (S 211), and this process ends.

  The waveform analysis apparatus 100 may be configured as an integrated apparatus such as a digital oscilloscope, or the measurement side apparatus and the analysis side apparatus may be configured as independent apparatuses. In the latter case, for example, the measurement side device may include a measurement unit 110, an acquisition memory 120, a file processing unit 130, and a hard disk 150, and an analysis side device including a waveform analysis processing unit 140 and a display unit 160. it can. At this time, each time the divided waveform data is generated by the measurement side device, the file is transferred to the analysis side device, and the analysis side device performs the subsequent processing. Or you may comprise with the measuring apparatus as the measurement part 110, and the analysis side apparatus provided with the other function part. As the analysis side device, for example, an information processing device such as a personal computer can be used.

  Further, every time the divided waveform data file is saved, the measurement waveform display during the measurement may be automatically performed regardless of whether there is an analysis request.

  As described above, according to the waveform analysis apparatus 100 of the present embodiment, the intermediate accompanying information is updated every time a divided waveform data file is saved during measurement execution. Data can be analyzed.

DESCRIPTION OF SYMBOLS 100 ... Waveform analyzer, 110 ... Measurement part, 120 ... Acquisition memory, 130 ... File processing part, 131 ... Waveform data preservation | save processing part, 132 ... Waveform data read-out processing part, 140 ... Waveform analysis processing part, 141 ... Waveform analysis part , 142 ... Intermediate accompanying information generation unit, 143 ... Intermediate accompanying information memory, 150 ... Hard disk, 160 ... Display part, 200 ... Waveform data file, 300 ... Waveform analysis device, 310 ... Measurement part, 320 ... Acquisition memory, 330 ... File Processing unit, 331 ... Waveform data storage processing unit, 332 ... Waveform data read processing unit, 340 ... Waveform analysis processing unit, 350 ... Hard disk, 360 ... Display unit, 1421 ... Waveform display intermediate data generation unit, 1422 ... Waveform address intermediate data Generation unit, 1423 ... Measurement condition intermediate data generation unit, 1431 ... During the accompanying information area, 1432 ... temporary storage area

Claims (4)

An acquisition memory that temporarily stores waveform data obtained continuously during measurement,
A file processing unit that reads out the waveform data in a predetermined unit from the acquisition memory and stores the waveform data in a nonvolatile storage device as a divided waveform data file;
Each time divided waveform data files are stored, based on the stored divided waveform data files, and waveform analysis processing unit for generating an intermediate accompanying information to be used for measurement and analysis of the course of the waveform data,
A waveform analysis apparatus comprising: The intermediate accompanying information is
It includes any one of access information to waveform data contained in the saved divided waveform data file, information on the measurement conditions of the measurement, and waveform display data of the waveform data contained in the saved divided waveform data file. The waveform analysis apparatus according to claim 1, wherein The waveform analysis processing unit
3. When a waveform data analysis request is received before completion of the measurement, the waveform data contained in the stored divided waveform data file is analyzed with reference to the intermediate accompanying information. Waveform analyzer described in 1. A waveform analyzer including a measuring device and an analyzing device,
The measurement side device is:
An acquisition memory that temporarily stores waveform data obtained continuously as measurement results;
A file processing unit that reads out the waveform data in a predetermined unit from the acquisition memory and stores it in a nonvolatile storage device as a divided waveform data file;
The analysis side device is:
Each time a divided waveform data file is saved, a waveform analysis processing unit that creates intermediate accompanying information used for analysis of waveform data during measurement with reference to the saved divided waveform data file is provided. Waveform analyzer.