JPH09196697A - Method for displaying measuring data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid a burden onto a CPU of a main body of a measuring device, by statistically processing measuring data in a memory in accordance with a preliminarily set predetermined statistic processing program, and displaying the measuring data by an operation means in response to an output command when a transfer completion signal for the measuring data is detected. SOLUTION: A data output device 10 is connected to a main body 1 of a measuring apparatus. The device 10 is provided with an operation means 12 for receiving data from the main body 1 via a buffer circuit 11, a control memory 13a for storing statistic processing programs, and a data memory 13b. When a print key 15g is pressed, a data transfer command is sent from a CPU 12 to the main body 1. A transfer completion by a stop key 15f is judged. If the transfer is not completed, the device is turned in a standby mode. If data are being transferred, the CPU 12 receives the measuring data and judges whether an END code arrives. If the END code does not come, the measuring data are stored in the memory 13b and output to a printer 14. When the END code is detected, data in the memory 13b are statistically processed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of displaying measurement data, and more specifically, it receives measurement data from a measuring instrument body, subjects the measurement data to predetermined statistical processing, and displays the result on a display or printer. The present invention relates to a method of displaying measurement data, which can be displayed and is particularly suitable for process control.

[0002]

2. Description of the Related Art Generally, an electric measuring instrument is equipped with a CPU and a memory as arithmetic means and a display means such as a display and a printer. By having the data, it is possible to perform statistical processing (for example, standard deviation calculation, histogram creation) for a certain population.

However, if it is applied to a production line to perform statistical processing while measuring individual measured parts at high speed, the load on the CPU becomes large and it becomes difficult to cope with high-speed processing. Therefore, conventionally, as illustrated in FIG. 7, the measuring device main body 1 is provided with only a function of measuring a measured component (resistive element in this example) Rx flowing from a production line and, for example, a pass / fail judgment function. The data output device 2 and the personal computer 3 as separate devices share data display and statistical processing.

That is, the data output device 2 is provided with a display means such as a display 2a and a printer 2b, and outputs the measurement data from the measuring instrument body 1 to the display means in the order of reception. The measurement data is transferred to the personal computer 3 and stored in its memory.

The operator looks at the data printed out from the data output device 2 and, for example, when the measurement of one lot is completed, operates the keyboard to calculate the average value, the standard deviation, the histogram or the personal computer 3. When a statistical processing command for creating a measured value graph is given, the statistical processing is executed by the personal computer 3, and the processing result is retransmitted and displayed on the data output device 2.

[0006]

According to this, the load on the CPU of the measuring instrument main body 1 is lightened, and it is possible to cope with the speeding up of the production line. However, the personal computer 3
Also, since a connecting device such as a GP-IB or a Centronics interface for connecting the computer 3 and the data output device 2 is required, it is expensive and the entire device becomes large.

Further, in order for the personal computer 3 to carry out from the reception of the measurement data to the statistical processing,
For example, it is necessary to compose a program in the BASIC language or the like, which requires a considerable amount of work. In addition, even if a histogram is created, the central value, rank width, and the number of ranks must be set manually (key input), and the operation is troublesome.

However, depending on the program, by specifying only the number of ranks, the middle point between the maximum value and the minimum value in the measurement data is taken as the central value, and the rank width of the following equation = (maximum value−central value) / rank It is also practiced to automatically set the rank width by a number to create a histogram, but since the resolution of the measuring device is not taken into consideration, there are many ranks where the measurement data is not distributed, and it is appropriate. The histogram may not be obtained.

For example, measurement data 1 from the measuring instrument body 1
Let ~ 6 be the following values: Measurement data 1: 0.0001Ω 2: 0.0002Ω 3: 0.0002Ω 4: 0.0003Ω 5: 0.0003Ω 6: 0.0001Ω Center value: 0.0002Ω Minimum value: 0.0001Ω Maximum value: 0.0003Ω

As described above, the resolution of the measuring instrument body 1 is five digits. If this is divided into five ranks, one rank width is calculated by the above equation as follows: rank width = (0.0003−0.0002) / 5 = 0.
Therefore, the histogram range in which the minimum value and the maximum value are included is ± 5 ranks. Rank 1: 0.00009 to 00011Ω Rank 2: 0.00011 to 00013Ω Rank 3: 0.00013 to 00015Ω Rank 4: 0. 00015-00017Ω Rank 5: 0.00017-00019Ω Rank 6: 0.00019-00021Ω ↓ ↓ ↓ Rank 10: 0.00027-00002Ω Rank 11: 0.00029-00031Ω, and descriptions of ranks 7-9 are omitted. However, ranks 1-6 and 10,11 shown above
However, the ranks 2 to 5 and 10 are originally not applicable in view of the resolution of the measuring device body 1, and cannot be said to be proper histograms.

The present invention has been made in order to solve the above-mentioned conventional problems, and its main purpose is to provide a data output device itself with a statistical processing function so that information necessary for production management can be obtained. It is to provide a method of displaying measurement data that can be appropriately displayed. In addition, the next object of the present invention is to provide a method for displaying measurement data that allows a histogram to be created and displayed based on the rank width considering the resolution of the measurement data supplied from the measuring instrument body. To provide.

[0012]

In order to achieve the main object described above, the invention according to claim 1 is provided with a data output device including display means such as a display and a printer, and is supplied from a measuring instrument main body. In the measurement data display method of displaying measurement data on the display means, the data output device includes a memory for storing the measurement data,
It has an operation means for statistically processing the measurement data in the memory according to a predetermined statistical processing program set in advance, and an operation section for giving an instruction such as an output command to the operation means, and the operation means performs the measurement. When the data transfer end signal is received, the measured data in the memory is subjected to predetermined statistical processing and displayed on the display means.

In this case, the transfer end signal may be a specific code signal added to the end of the measurement data supplied from the measuring instrument main body, As described in claim 3, the transfer end signal may be an end signal given from the operation unit.

In any case, according to the present invention, the predetermined statistical processing is performed by the data output device itself when the transfer of the measurement data is completed.
Predetermined statistical processing can be performed without imposing a burden on (calculation means) and without using a personal computer.

According to a fourth aspect of the present invention, the statistical processing program includes a histogram creating program, and the arithmetic means executes the histogram creating program to obtain the maximum value and the minimum value in the measured data. Is within the histogram range, and the histogram is created so that the rank width is equal to or larger than the minimum resolution of the measurement data. According to this,
An appropriate histogram is created under the rank width in consideration of the resolution of the measurement data supplied from the measuring device main body, which is the next object of the present invention.

Further, in the invention of claim 5, the statistical processing program includes a measured value graph creating program, and the arithmetic means takes a measured data number on a time axis when executing the measured value graph creating program. , It is characterized by displaying the time displacement graph of each measurement data with the axis orthogonal to it as the measurement value axis with the full scale from the minimum value to the maximum value in the measurement data. It is possible to understand whether there is a large change.

Further, in the invention of claim 6, the statistical processing program includes at least one of a standard deviation calculation program, a process capability index calculation program, and an index calculation program. Therefore, it is possible to control the quality of the measured part in almost real time.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Next, in order to better understand the technical idea of the present invention, an embodiment of the present invention will be described with reference to the drawings.

Similar to FIG. 7 described above, FIG. 1 shows a state in which the measured component Rx is being measured by the measuring device main body 1. In this embodiment, the measuring device main body 1 is high speed. A response type low resistance meter is used.
May be an LCR measuring device, a power meter, or the like.

The present invention comprises a data output device 10 which can be connected to the measuring device main body 1 via a predetermined lead. FIG.
Referring also to, the data output device 10 includes a CPU 12 as an arithmetic means for receiving the measurement data from the measuring instrument body 1 via the buffer circuit 11, and a control including, for example, a ROM in which a control program of the CPU 12 is stored. Memory 13a and SRAM for storing measurement data
A data memory 13b composed of, for example, and a display means 14
And a menu display unit 16 including an operation unit 15 and a liquid crystal display element.

The display means 14 may be either a display or a printer, but a printer is used in this embodiment. The operation unit 15 is an input unit that gives various commands to the CPU 12. The operation unit 15 includes, for example, a start key 15a and a histogram creation key 15
b, measured value graph creation key 15c, cancel key 15
A selection key group 15h for selecting each setting item from the d, paper feed key 15e, stop key 15f, print key 15g, and menu display unit 16 is provided.

In the control memory 13a, the measurement data reception program, the average value calculation program shown in the following equation 1 and the standard deviations σn and σn− shown in the equations 2 and 3 are given.
A statistical processing program such as a calculation program of No. 1, a calculation program of process capability index Cp shown in Formula 4, and a calculation program of index Cpk shown in Formula 5 is stored.
The process capability index Cp and the upper limit value and the lower limit value in the arithmetic expression of the index Cpk are numerical values input by the operator while observing the menu display screen 16, and the process capability index Cp is the quality achievement capability, that is, It means the range of variations in the quality of the process. Usually this index is 1.0
It is said that the above is sufficient.

[0023]

[Equation 1]

[Equation 2]

(Equation 3)

(Equation 4)

(Equation 5)

The statistical processing program of the control memory 13a includes a histogram creating program and a measured value graph creating program. When a histogram is created, a selection screen is displayed on the menu display screen 16 as to whether to manually set the center value, rank width, and number of ranks, or to set automatically (auto), but in this embodiment, the manual, In any case of auto, the rank width is 0.1%,
0.2%, 0.5%, 1.0%, 2.0%, 5.0%,
It is fixed in eight stages of 10.0% and 20.0% (rank number ± 5 ranks), and a desired rank width is selected from these.

Next, the operation of the present invention will be described with reference to the flow chart of FIG. 3. In this embodiment, when the measurement data is transferred from the measuring instrument body 1 to the data output device 10, the final measurement data is transferred. After that, a code "END" that means the end of transfer is added.

To explain this, the measuring device main body 1 sequentially writes the measurement data of the component under test Rx into its storage memory. In this example, "EN" is written at the first address.
The "D" code is written, and every time the measurement data is written, the "END" code is sent forward on the address.
Therefore, there is always an "END" code after the final measurement data. Even before the "END" code appears, the transfer of the measurement data can be terminated by pressing the stop key 15f of the operation unit 15.

When the print key 15g is pressed, the CPU
An instruction to transfer the measurement data is output from 12 to the measuring device body 1. Then, first, in step ST1, the stop key 15
It is determined whether or not the process is completed by f, and if NO, step ST
In 2, it is determined whether or not the measurement data is transferred. If the measurement data is not transferred, the process returns to step ST1 and waits until the measurement data is transferred.

When the measurement data is transferred from the measuring instrument main body 1 via the buffer circuit 11, the CPU in step ST3.
12 receives the measurement data, and then step ST4
Determines whether the "END" code has arrived. If NO, the measured data is stored in the memory 13b in step ST5.
And stores the measured data in the printer 14 by executing step ST6.

Steps ST1 to ST6 are repeated until the "END" code arrives from the measuring device main body 1, and as a result, as shown in FIG. 4 (a), each measurement is performed in the order in which the data is received from the printer 14. The data is printed out. According to this embodiment, first, the time data at the start is printed, and then, the measurement data number for each line, the elapsed time from the measurement start time (in this example, in seconds), the measured value and the determination result (Lo). , IN, Hi, NG
Etc.) is printed.

When the "END" code is detected in step ST4, the end time is printed on the last line, and the process jumps to step ST7 to execute statistical processing on each measurement data taken in the memory 13b. It
Similarly, when there is an end command from the stop key 15f, the process jumps to step ST7 and the statistical processing is executed.

In this embodiment, the average value (AV
E), the minimum value (MIN), the maximum value (MAX), the standard deviations σn, σn−1, the process capability index Cp, and the index Cpk are calculated according to the above-mentioned calculation formulas, and the statistical values are calculated in step ST8. It is output and printed out as shown in FIG. Note that N is the number of measured data, and 100 in this case means that the number of data statistically processed is 100. Further, regarding the minimum value (MIN) and the maximum value (MAX), the data number of the corresponding measurement data is added.

Here, when looking at the histogram,
Press the histogram creation key 15b of the operation unit 15. Then, the selection screen of manual or automatic is displayed on the menu display unit 16. When the manual is selected, the center value, the rank width and the number of ranks are input by the key operation. However, when the auto is selected, the CPU 12 goes through the following procedure to create the histogram which seems to be the best.

In this example, the set value of the rank width that can be selected as described above is 0.1% with respect to the central value,
0.2%, 0.5%, 1.0%, 2.0%, 5.0%,
The number of ranks is 10.0% and 20.0%, and the number of ranks is fixed, for example, ± 5 ranks in advance. 1 or more resolution of the measurement data transferred from
A set value is obtained such that the minimum value and the maximum value are included between the lower limit value and the upper limit value of.

Rank width = (center value) × (set value ÷ 100) Histogram lower limit value = (center value) × {1- (set value ÷
100) × 5.5} Histogram upper limit value = (center value) × {1+ (setting value ÷
100) x 5.5}

As a result, as shown in FIG.
The printer 14 outputs a histogram in which the rank width is, for example, 0.5% with respect to the central value (555.45Ω in this example). As in this example, if the set value of the selectable rank width is fixed in advance, it is expected that the rank width obtained by the above will not be higher than the resolution of the measurement data depending on the setting value. However, in that case, first, the histogram lower and upper limits of are set preferentially so that the minimum and maximum values of the measurement data are included, and then the rank closest to the resolution of the measurement data. The width should be obtained.

Further, according to the present invention, by pressing the measured value graph creation key 15c of the operation unit 15, a measured value graph as illustrated in FIG. 6 can be obtained. That is,
By this measurement value graph creation command, the CPU 12 causes the measurement data number (1 in this example) to be displayed on the time axis (vertical axis in FIG. 6).
.About.100), and an axis (horizontal axis in the figure) orthogonal thereto is used as a measurement value axis having a full scale from the minimum value to the maximum value in the measurement data, and a time displacement graph of each measurement data is displayed.

In this graph, the measurement value axis is a full scale from the minimum value to the maximum value in the measurement data,
This is suitable for easily grasping the minimum data and the maximum data, and for managing whether or not the measured value varies depending on the time zone. Since the storage capacity of the memory 13b is limited, pressing the cancel key 15d erases the measurement data held up to that point and prepares for the acquisition of the next measurement data. By printing out measurement data, statistical data and histograms and measurement graphs,
Data can be saved.

In the above embodiment, the measurement data transfer end signal is generated on the measuring instrument main body side, but if the measuring instrument main body does not have such a function, it is manually transmitted by a stop key or the like. An end signal may be given. In this sense, this data output device can be used universally without selecting the measuring device main body. Further, although a printer is used as the display means, a display may be used together to print out and store only necessary data, and in some cases, the printer may be removed and only the display may be used. Furthermore, individual measurement data, statistical data, etc. can be stored in a floppy disk as an external storage means.

[0039]

As described above, according to the present invention,
When the transfer of the measured data from the measuring instrument is completed,
Since the data output device itself performs the predetermined statistical processing, the predetermined statistical processing can be performed without imposing a burden on the CPU (calculating means) of the measuring apparatus main body, and the measuring apparatus main body can be used for general purpose. Can be used for any purpose.

In executing the histogram creating program, the maximum value and the minimum value in the measurement data are within the histogram range, and the rank width thereof is preferably equal to or more than the minimum resolution of the measurement data. Therefore, a proper histogram is created.

Further, in executing the measurement value graph creation program, a measurement data number is set on the time axis, and an axis orthogonal to the time axis is set as a measurement value axis having a full scale from the minimum value to the maximum value in the measurement data. By displaying the time displacement graph of the measurement data, it is possible to easily understand where the minimum value data and the maximum value data are, and whether the measured values fluctuate significantly over time. .

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a state in which a data output device applied to the present invention is connected to a measuring device main body.

FIG. 2 is a block diagram illustrating an internal configuration of the data output device.

FIG. 3 is a flowchart for explaining the operation of the present invention.

FIG. 4 is an explanatory view showing an example of printout of measurement data and statistical data displayed by the present invention.

FIG. 5 is an explanatory diagram illustrating a histogram created by the present invention.

FIG. 6 is an explanatory diagram illustrating a measurement value graph created by the present invention.

FIG. 7 is a schematic diagram for explaining a conventional example.

[Explanation of symbols]

 1 Measuring Instrument Main Body 10 Data Output Device 12 Arithmetic Means (CPU) 13a Control Memory 13b Data Memory 14 Display Means (Printer, Display) 15 Operation Unit

Claims (6)

[Claims] 1. A method for displaying measurement data, comprising a data output device including a display means such as a display or a printer and displaying the measurement data supplied from a measuring instrument main body on the display means, wherein the data output device comprises: It has a memory for storing the measurement data, a calculation means for statistically processing the measurement data in the memory according to a predetermined statistical processing program set in advance, and an operation section for giving an instruction such as an output command to the calculation means. When the arithmetic means receives the transfer end signal of the measured data, the measured data in the memory is subjected to predetermined statistical processing and displayed on the display means. . 2. The method for displaying measurement data according to claim 1, wherein the transfer end signal is a specific code signal added to the end of the measurement data supplied from the measuring instrument body. 3. The method for displaying measurement data according to claim 1, wherein the transfer end signal is an end signal given from the operation unit. 4. The histogram processing program is included in the statistical processing program, and when the computing means executes the histogram creation program, the maximum value and the minimum value in the measurement data are within the histogram range, and The method for displaying measurement data according to claim 1, wherein the histogram is created so that the rank width is equal to or larger than the minimum resolution of the measurement data. 5. The statistical processing program includes a measurement value graph creation program, and the arithmetic means takes a measurement data number on a time axis when executing the measurement value graph creation program and measures an axis orthogonal to the measurement data number. The method for displaying measurement data according to claim 1, wherein a time displacement graph of each measurement data is displayed as a measurement value axis from the minimum value to the maximum value in the data. 6. The measurement according to claim 1, wherein the statistical processing program includes at least one of a standard deviation calculation program, a process capability index calculation program, and an index calculation program. How to display the data.