JP2023009163A - measuring instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the display synchronism of an input signal with a computation result in a measuring instrument having a real-time computation function.

SOLUTION: A waveform memory unit 120 in which data of an input signal is stored includes a waveform memory 122 and a first memory control unit 121 for outputting address information for storing the data of an input signal in the waveform memory, and a computation unit 130 includes a signal computation unit 132 for performing a prescribed computation for each measurement section, a second memory control unit 133 for associating computation data with the address information, and a computation result memory 134 for storing the address information and the computation data. A display control unit 141 associates the computation data with the data of the input signal stored in the waveform memory 122 on the basis of the address information stored in the computation result memory 134 and thereby causes the computation data to be displayed at the position that corresponds to a measurement section in which the computation is performed.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2023,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to a measuring instrument, and more particularly to improving the synchronism of display between an input signal and a computation result in a measuring instrument having a real-time computation function.

One type of measuring instrument is configured to perform calculations on an input signal in real time and display the results of the calculations along with waveform records (see, for example, Non-Patent Document 1).

Etsuro Nakayama, Chiaki Yamamoto, "ScopeCorder DL850 Real-Time Calculation Function", Yokogawa Technical Report, Vol. 55, No. 1, 2012.

However, when the measuring device performs calculation over the signal measurement section, the calculation result is not determined until the measurement section for which the calculation is performed is determined. Therefore, when displaying the calculated data, the calculated data of the signal in a certain measurement interval is displayed with a delay from the measurement interval.

For this reason, it is difficult for the user performing measurements to compare the input signal in a certain measurement interval with the calculated data calculated based on the input signal in that measurement interval, making it difficult to understand the relationship between the input signal and the calculated data. There was a problem that

One aspect of the present invention is
In a measuring instrument having a display that displays an input signal,
a calculation unit that performs a predetermined real-time calculation for each measurement interval on the input signal;
a display control unit that causes the display unit to display the calculated data output from the calculation unit at a position corresponding to the measurement interval in which the calculation was performed;
have

Another aspect of the invention is
a signal memory in which data of the input signal is stored;
a first memory control unit that outputs address information for storing the data of the input signal in the signal memory;
The arithmetic unit includes a signal arithmetic unit that performs a predetermined arithmetic operation on the input signal for each measurement interval, a second memory control unit that associates the arithmetic data with the address information, and the address information and the arithmetic data. has an arithmetic memory that stores
The display control unit performs the calculation on the calculation data by associating the calculation data with the data of the input signal stored in the signal memory based on the address information stored in the calculation memory. Display at the position corresponding to the measurement section.

Another aspect of the invention is
The second memory control unit associates a non-display code with the address information corresponding to the arbitrary measurement section when the calculation is not performed for an arbitrary measurement section among the measurement sections, and the stored in operation memory,
When the calculation is performed for the arbitrary measurement section, the non-display code is rewritten with the calculation data corresponding to the arbitrary measurement section.

Another aspect of the invention is
When the non-display code associated with the address information corresponding to the arbitrary measurement interval is stored in the arithmetic memory, the display control unit outputs the arithmetic data to the arbitrary measurement interval of the display unit. is not displayed at the position corresponding to
When the non-display code is rewritten with the calculation data corresponding to the arbitrary measurement section, the calculation data is displayed on the display unit at a position corresponding to the measurement section in which the calculation is performed.

Another aspect of the invention is
The calculation section has a period determination section that detects a period of the input signal and outputs the period to the signal calculation section as the measurement interval.

Another aspect of the invention is
The calculation section has a period determination section that outputs an arbitrarily set time as the measurement interval to the signal calculation section.

Another aspect of the invention is
the input signals are a voltage signal and a current signal;
The calculator calculates power based on the voltage signal and the current signal.

According to the present invention, in a measuring instrument having a display section for displaying an input signal, by displaying the input signal and the calculated data at corresponding positions, the user can easily understand the input signal in a certain measurement interval and the measurement interval. It is possible to provide a measuring instrument that facilitates comparison with calculated data calculated based on the measured signal and facilitates understanding of the relationship between the input signal and the calculated data.

1 is a diagram showing a schematic configuration of a waveform measuring instrument according to one embodiment of the present invention; FIG. FIG. 4 is a diagram showing an example in which the memory control section 121 in the waveform measuring instrument according to the embodiment of the present invention assigns addresses to input signals; 4 is a flow chart showing an example of the operation of a memory control unit 133; 3 is a diagram showing an example in which a memory control unit 133 operates over measurement intervals T1 to T3 and stores data in a calculation result memory 134. FIG. 4 is a diagram showing an example in which the display section 142 in the waveform measuring instrument according to the embodiment of the present invention displays the input signal and the calculated data at the time of the measurement interval T1; FIG. FIG. 10 is a diagram showing an example in which the display unit 142 in the waveform measuring instrument according to the embodiment of the present invention displays the input signal and the calculated data at the time of the measurement interval T2; FIG. 10 is a diagram showing an example in which the display unit 142 in the waveform measuring instrument according to the embodiment of the present invention displays the input signal and the calculated data at the time of the measurement interval T3; It is a figure which shows schematic structure of the waveform measuring instrument of related technology. FIG. 10 is a diagram showing an example in which a display unit 210 in a related art waveform measuring instrument displays an input signal and calculation data;

Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. Also, not all combinations of features described in the embodiments are essential for the solution of the invention.

FIG. 8 is a block diagram showing the configuration of a waveform measuring instrument 200, which is related technology of the measuring instrument according to this embodiment.

In the waveform measuring instrument 200 of FIG. 8, a voltage analog input signal of channel 1 (CH1) is input to an amplifier 201, gain-adjusted according to a preset range, and input to an A/D converter 202 to obtain a voltage digital signal. converted to a signal.

A current analog input signal of channel 2 (CH2) is input to amplifier 203, gain-adjusted according to a preset range, input to A/D converter 204, and converted to a current digital signal.

Memory control section 205 stores the data of the voltage digital signal and the current digital signal input from A/D converters 202 and 204 in waveform memory 208 . The memory control section 205 also stores the calculation data input from the calculation section 207 in the waveform memory 208 .

The cycle determination unit 206 detects the cycle of the voltage digital signal by detecting the rising edge of the zero crossing of the voltage digital signal input from the A/D converter 202, and determines the measurement interval. One cycle from the rise of the zero cross of the voltage digital signal to the rise of the next zero cross is defined as one measurement section. The cycle determination unit 206 outputs the information on the detected rise time to the calculation unit 207 as a rise signal.

Calculation section 207 performs real-time calculation of electric power on the voltage digital signal and current digital signal inputted from A/D converters 202 and 204 based on the rise signal inputted from period determination section 206 . Power is calculated by multiplying the voltage digital signal and the current digital signal in the measurement interval from the rising edge of the zero crossing of the voltage digital signal to the rising edge of the next zero crossing based on the rising signal, integrating, and then dividing by the time of the measurement interval. is required.

The display control unit 209 converts the display waveform data for displaying the data of the voltage digital signal and the current digital signal stored in the waveform memory 208 and the display calculation data for displaying the calculation data into a drawing set in advance. It is created every cycle T'.

The display control unit 209 outputs the display calculation data of the measurement interval to the display unit 210 if the calculation data of the measurement interval is complete when the drawing cycle T′ is updated and the display calculation data is created. . On the other hand, when the drawing cycle T′ is updated and the display calculation data is created, if the calculation data for a certain measurement interval is not complete, the display control unit 209 sends the display calculation data for the measurement interval to the display unit 210. No output.

The display unit 210 displays the voltage digital signal, the current digital signal and the operation data in real time based on the display waveform data and the display operation data input from the display control unit 209 . The display unit 210 displays the voltage digital signal and the current digital signal at locations corresponding to the times when the voltage digital signal and the current digital signal are input to the memory control unit 205 . The display unit 210 displays the calculated data at a location corresponding to the time when the calculated data was acquired.

However, according to the configuration of FIG. 8, when the calculation unit 207 performs calculations over a signal measurement interval, the data necessary for the calculation are not available until the measurement interval is completed. cannot be determined. Therefore, the display unit 210 displays the calculated data in a certain measurement interval with a delay after the end of the measurement interval.

FIG. 9 shows an example in which the display unit 210 displays voltage digital signals, current digital signals, and calculation data in the related art. The rises of the zero crossings of the voltage digital signal detected by the period determination unit 206 based on the voltage digital signal are represented by a rise S1, a rise S2, and a rise S3, respectively. is shown as a measurement interval T2, and the interval after the rise S3 is shown as a measurement interval T3.

Drawing cycles T'1, T'2, T'3, . . . , and T'n in FIG. Although not shown, the drawing period T' is set to be repeated even after the measurement interval T2. Note that the drawing cycle T' is sufficiently shorter than the time of the measurement interval T. In addition, the display control unit 209 repeatedly creates the display waveform data and the display calculation data for each drawing cycle T' which is sufficiently shorter than the time of the measurement interval T. FIG.

Since the calculated data obtained from the signal in the measurement interval T1 is obtained after the rise S2 at which the measurement interval T1 ends, the time at which the display control unit 209 outputs the display calculation data in the measurement interval T1 to the display unit 210 is the measurement interval It overlaps with the time when the display waveform data of T2 is output to the display unit 210 . As a result, the display section 210 displays the calculated data of the measurement section T1 in the area of the measurement section T2. Similarly, the calculated data of the measurement section T2 is displayed in the area of the measurement section T3. That is, the calculated data is delayed with respect to the input signal on which the calculation is based, and is not displayed at the position corresponding to the input signal on which the calculation is based.

For this reason, it is difficult for the user performing measurement to compare the input signal in a certain measurement interval with the calculated data calculated based on the input signal in that measurement interval, making it difficult to understand the relationship between the input signal and the calculated data. was there.

Therefore, in the measuring instrument according to the present embodiment, the input signal and the calculated data are displayed at corresponding positions in the measuring instrument having the display unit for displaying the input signal, so that the user can easily understand the input signal in a certain measurement interval, To provide a measuring instrument which facilitates comparison with calculated data calculated based on the input signal in the measurement section, and which facilitates understanding of the relationship between the input signal and the calculated data.

As a measuring instrument according to the present embodiment, a waveform measuring instrument that performs power calculation based on input voltage analog signals and current analog signals will be described below.

FIG. 1 is a block diagram showing a schematic configuration of a waveform measuring instrument 100 according to one embodiment of the invention. The waveform measuring instrument 100 includes an amplifier 111, an A/D converter 112, an amplifier 113, an A/D converter 114, a memory control section 121, a waveform memory 122, a period determination section 131, a signal calculation section 132, a memory control section 133, It is composed of the operation result memory 134 .

Here, amplifier 111, A/D converter 112, amplifier 113, and A/D converter 114 are collectively referred to as input section 110. FIG. The memory control section 121 and the waveform memory 122 are collectively referred to as a waveform memory section 120 . Also, the cycle determination unit 131 , the signal calculation unit 132 , the memory control unit 133 , and the calculation result memory 134 are collectively referred to as the calculation unit 130 .

In FIG. 1, a voltage analog input signal of channel 1 (CH1) is input to an amplifier 111 and gain-adjusted according to a preset range. The gain-adjusted voltage analog signal output from the amplifier 111 is input to the A/D converter 112 and converted into a voltage digital signal.

A current analog input signal of channel 2 (CH2) is input to an amplifier 113 and gain-adjusted according to a preset range. The gain-adjusted current analog signal output from the amplifier 113 is input to the A/D converter 114 and converted into a current digital signal.

Memory control unit 121 creates address information for storing voltage digital signal data and current digital signal data input from A/D converters 112 and 114 in waveform memory 122 . The memory control unit 121 outputs the voltage digital signal data, the current digital signal data, and the created address information to the waveform memory 122 . Also, the memory control unit 121 outputs the address information to the cycle determination unit 131 .

FIG. 2 is a diagram showing the voltage digital signal and the address information given by the memory control unit 121. In FIG.

The voltage digital signal is digitized by the A/D converter 112 according to the sampling period. The white circles shown in FIG. 2 indicate the digital data of the voltage digital signal digitized according to the sampling period.

The memory control unit 121 assigns addresses such as address n0, address n1, address n2, . Although an example of assigning addresses to the voltage digital signal is shown here, the memory control unit 121 also assigns addresses to the current digital signal in the same manner, and outputs the same to the waveform memory 122 and the period determining unit 131 .

The waveform memory 122 stores the voltage digital signal and the current signal input from the memory control section 121 at the address input from the memory control section 121 .

The period determination unit 131 detects the period of the voltage digital signal by detecting the rising edge of the zero crossing of the voltage digital signal input from the A/D converter 112, and determines the measurement interval. A measurement interval is a period from the rising edge of the zero crossing of the voltage digital signal to the rising edge of the next zero crossing. The period determination unit 131 outputs the information on the detected rise time to the signal calculation unit 132 and the memory control unit 133 as a rise signal.

FIG. 2 shows the position on the time axis of the rise of the zero crossing of the voltage digital signal detected by the period determining section 131 . The rising edge of zero cross obtained first after the start of measurement is shown as rising edge S1, rising edge S2, and rising edge S3. Also, the section between rising S1 and S2 is shown as measurement section T1, the section between rising S2 and S3 is shown as measurement section T2, and the section after rising S3 is shown as measurement section T3. Drawing cycles T'1, T'2, T'3, . Although not shown, the drawing period T' is set to be repeated even after the measurement interval T2. Note that the drawing cycle T' is sufficiently shorter than the time of the measurement interval T.

The signal calculator 132 performs real-time power calculation on the voltage digital signal and the current digital signal input from the A/D converters 112 and 114 based on the rising signal input from the period determiner 131 . The power is obtained by multiplying the voltage digital signal and the current digital signal in the measurement interval from the rising edge of the zero crossing of the voltage digital signal to the rising edge of the next zero crossing, integrating, and then dividing by the time of the measuring interval.

For example, when performing power calculation for the measurement section T1 in FIG. The power is obtained by dividing by the time of the interval T1.

The memory control unit 133 selects the address of the waveform memory 122 located at the rising edge of the first zero cross included in the measurement interval on which the calculation data is based, among the address information input from the period determination unit 131, and the address from the signal calculation unit 132. Input calculation data is stored in the calculation result memory 134 .

Here, the memory control unit 133 sets the address of the waveform memory 122 and the calculation data, which are the data of the same measurement section, in the order in which the addresses and the calculation data of the waveform memory 122 are obtained, and sets the addresses of the waveform memory 122 and the calculation data to the same address a of the calculation result memory 134. (n). For example, the address n0 of the waveform memory 122 and the operation data of the measurement interval T1 in FIG. 2 are stored in the address a1, and the address n100 of the waveform memory 122 and the operation data of the measurement interval T2 are stored in the address a2.

FIG. 3 is a flow chart showing the operation of the calculation unit 130. As shown in FIG.

The cycle determination unit 131 detects the rising edge of the zero crossing of the voltage digital signal input from the A/D converter 112, and if the rising edge corresponding to the starting point of the measurement interval T(n) is detected, the process proceeds to step S102. (Step S101: YES). Here, it is assumed that n=1 at the start of measurement. If the rise is not detected, the detection of the rise is repeated (step S101: NO).

Based on the rising edge detected by the cycle determination unit 131, the memory control unit 133 stores the address of the starting point of the measurement interval T(n) and the address a(n) of the operation result memory 134 with the calculation result in the measurement interval T(n). A non-display code indicating that is not obtained is stored in the address a(n) of the operation result memory 134 . For example, when n=1, T(n)=T1, and the address n0 of the starting point of the measurement interval T1 and the non-display code are stored in the address a1 of the operation result memory 134 (step S102).

When the period determining unit 131 detects a rise indicating the start point of the next measurement interval T(n+1) after the measurement interval T(n) (step S103: YES), the process proceeds to step S104. If the rise is not detected, the detection of the rise is repeated (step S103: NO).

Based on the cycle detected by the cycle determining unit 131, the memory control unit 133 stores the address of the starting point of the measurement interval T(n+1) and the non-display code in the address a(n+1) of the calculation result memory 134. FIG. For example, when n=1, T(n+1)=T2, and the address n100 of the starting point of the measurement interval T2 and the non-display code are stored in the address a2 of the operation result memory 134 (step S104).

The signal calculator 132 performs power calculation for the measurement section T(n) based on the rise corresponding to the measurement section T (step S105). For example, when n=1, T(n)=T1, and power calculation is performed for the measurement interval T1. Then, the memory control unit 133 deletes the address of the start point of the measurement section T(n) and the non-display code stored in the address a(n) of the calculation result memory 134, and deletes the address of the start point of the measurement section T(n). and the calculated data of the measurement section T(n) are stored in the address a(n) (step S106). For example, when n=1, T(n)=T1 and a(n)=a1, and the address n0 of the starting point of the measurement section T1 and the non-display code stored in the address a1 of the calculation result memory 134 are deleted. , the address n0 of the starting point of the measurement interval T1 and the calculation data of the measurement interval T1 are stored in the address a1.

When the input signal is no longer input and the memory control unit 121 finishes storing the voltage digital signal and the current digital signal in the waveform memory 122, the operation is finished (step S107: YES). If the measurement continues, the operation continues and the process proceeds to step S108 (step S107: NO).

Replace n contained in the above T(n), T(n+1), a(n), and a(n+1) with n+1, and return to step S103 (step S108). Thereafter, steps S103 to S108 are repeated until the storage of the voltage digital signal and the current digital signal is completed.

FIG. 4 is a diagram showing an example in which the memory control unit 133 operates over the measurement intervals T1 to T3 and stores data in the calculation result memory 134. As shown in FIG.

FIGS. 4A to 4C show data stored in the calculation result memory 134 at respective times of the measurement intervals T1 to T3. The left columns of the tables of FIGS. The center column and the right column are memory areas of the operation result memory 134 , and the center column indicates the address for storing the waveform memory 122 stored in the operation result memory 134 . Also, the right column shows the computation data or non-display code stored in the computation result memory 134 .

FIG. 4(a) shows data stored in the calculation result memory 134 at the time of the measurement interval T1. When the period determination unit 131 detects the rise of the starting point of the measurement interval T1, the memory control unit 133 stores the address n0 corresponding to the measurement interval T1 and the non-display code in the address a1 in the calculation result memory 134 .

FIG. 4(b) shows data stored in the calculation result memory 134 at the time when the measurement shifts from the measurement interval T1 to the measurement interval T2. When the cycle determination unit 131 detects the rise of the starting point of the measurement interval T2, the memory control unit 133 stores the address n100 corresponding to the measurement interval T2 and the non-display code in the address a2 in the calculation result memory 134 . Further, since the signal calculation unit 133 performs the power calculation for the measurement interval T1 and obtains calculation data for the measurement interval T1, the memory control unit 133 determines that the address n0 stored in the address a1 of the calculation result memory 134 is not equal to the address n0. The display code is deleted, and the calculated data of the address n0 and the measurement section T1 are stored in the address a1.

FIG. 4(c) shows data stored in the calculation result memory 134 at the time when the measurement shifts from the measurement interval T2 to the measurement interval T3. When the cycle determination unit 131 detects the rising edge of the measurement interval T3, the memory control unit 133 stores the address n200 corresponding to the measurement interval T3 and the non-display code in the address a3 in the calculation result memory 134 . Furthermore, since the signal calculation unit 133 performs the power calculation for the measurement interval T2 and obtains the calculation data for the measurement interval T2, the memory control unit 133 is different from the address n100 stored in the address a2 of the calculation result memory 134. The display code is deleted, and the calculated data of the address n100 and the measurement section T2 are stored in the address a2. The same applies to operations in subsequent measurement intervals.

The display control unit 141 creates display waveform data based on the data of the voltage digital signal and the current digital signal stored in the waveform memory 122 each time the preset drawing cycle T′ is updated. Further, the display control unit 141 creates display calculation data based on the calculation data stored in the calculation result memory 134 each time the drawing period T' is updated. Then, it outputs the display waveform data and the display calculation data to the display section 142 .

Here, if the calculation data corresponding to the measurement section in the calculation result memory 134 is stored when the drawing cycle T′ is updated, the display control unit 141 displays the calculation data of the measurement section. Create calculation data. On the other hand, when the drawing cycle T′ is updated, if the non-display code corresponding to the measurement section in the calculation result memory 134 is stored, the display control unit 141 updates the display calculation data corresponding to the measurement section. Do not create

The display unit 142 displays the voltage digital signal, the current digital signal and the operation data in real time based on the display waveform data and the display operation data input from the display control unit 141 . Here, the display unit 142 displays the calculated data at positions corresponding to the voltage digital signal and the current digital signal in the measurement section in which the calculation was performed. Further, when the display calculation data is not input in the measurement section in the display section 142, the display section 142 does not display the calculation data at the position corresponding to the measurement section.

5 to 7 are diagrams showing how the display unit 142 displays the voltage digital signal, the current digital signal, and the calculation data in real time over the measurement intervals T1 to T3. 5 to 7, the drawing periods T'1, T'2, T'3, . be.

FIG. 5 is an example of data display in a state in which the measurement interval T1 is not determined after the period determination unit 131 detects the rising edge S1. FIG. 5(a) shows a column in which the voltage digital signal of channel 1 (CH1) is displayed, and FIG. 5(b) shows a column in which the current digital signal of channel 2 (CH2) is displayed. FIG. 5(c) shows a power calculation result column in which calculation data is displayed. The same applies to FIGS. 6 and 7. FIG.

In the state of FIG. 5, since the non-display code is stored together with the address n0 of the starting point of the measurement section T1 at the address a1 of the calculation result memory 134, the calculation data is not displayed.

FIG. 6 is an example of data display when the measurement shifts from the measurement interval T1 to the measurement interval T2. The measurement interval T1 is determined, and the signal calculator 132 outputs the calculated data of the measurement interval T1. Then, the memory control section 133 rewrites the non-display code stored at the address a1 of the calculation result memory 134 with the calculation data of the measurement section T1, and the display section 142 displays the power calculation result of the measurement section T1 as the item of the measurement section. The calculated data of T1 is displayed. On the other hand, since the non-display code is stored together with the address of the starting point of the measurement interval T2 at the address a2 of the calculation result memory 134, the calculation data is not displayed in the power calculation result item of the measurement interval T2.

FIG. 7 is an example of data display when the measurement shifts from the measurement section T2 to the measurement section T3. The measurement section T2 is determined, and the signal calculator 132 outputs the calculation data of the measurement section T2. Then, the memory control unit 133 rewrites the non-display code stored at the address a2 of the calculation result memory 134 with the calculation data of the measurement interval T2, and the display unit 142 displays the power calculation result item of the measurement interval T2. Calculation data for the section T2 section is displayed. On the other hand, since the non-display code is stored together with the address of the starting point of the measurement interval T3 at the address a3 of the calculation result memory 134, the calculation data is not displayed in the power calculation result item of the measurement interval T3.

As described above, according to the present embodiment, power calculation data can be displayed at a position corresponding to the input signal on which the calculation is based. This makes it possible for a user who performs measurements to easily compare the input signal in a certain measurement interval with the calculated power data calculated based on the input signal in that measurement interval, and to understand the relationship between the input signal and the calculated data. easier to comprehend.

Further, according to the present embodiment, when the non-display code corresponding to the measurement section in the calculation result memory 134 is stored, the display control unit 141 does not create the display calculation data corresponding to the measurement section. Since the non-display code corresponding to the measurement section is rewritten to the calculation data and at the same time the display calculation data corresponding to the measurement section is created, the algorithm for creating the display calculation data performed by the display control unit 141 can be simplified. can.

In this embodiment, power is calculated based on the voltage signal and the current signal, but the present invention is not limited to this. For example, it may be applied to effective value measurement or frequency measurement in which calculation is performed based on the period of the input signal. Also, the number of input channels is not limited to two, and it is also possible to measure and calculate signals of one channel, or to measure and calculate signals of three or more channels.

In the present embodiment, the cycle determination unit 131 determines the measurement interval by detecting the rising edge of the zero crossing of the voltage digital signal input from the A/D converter 112. A measurement interval of the voltage digital signal may be determined by detecting a drop.

Further, in the present embodiment, the calculation is performed in the measurement interval determined by the rising edge of the voltage digital signal detected by the cycle determination unit 131, but the present invention is not limited to this. For example, calculation and measurement may be performed by setting a measurement interval every arbitrary time.

Further, in the present embodiment, the time interval between the measurement intervals T1 to T3 of the signal to be measured by the waveform measuring device is constant in FIGS. 5 to 7, but the present invention is not limited to this. For example, the measurement interval may be determined based on the rise or fall of the zero crossing for a signal whose period changes, and calculation may be performed. Examples of signals whose period changes include voltage and current signals generated when a motor is started.

Note that the waveform memory 122 of this embodiment corresponds to the signal memory described in claim 2 .

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is obvious to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the description of the scope of claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 110... Input part 111... Amplifier 112... A/D converter 120... Waveform memory part 121... Memory control part (1st memory control part) 122... Waveform memory (signal memory) 130... Calculation part , 131... Period determination unit, 132... Signal calculation unit, 133... Memory control unit (second memory control unit), 134... Calculation result memory (calculation memory), 141... Display control unit, 142... Display unit

Claims (6)

In a measuring instrument having a display that displays an input signal,
a calculation unit that performs a predetermined real-time calculation for each measurement interval on the input signal;
a display control unit that causes the display unit to display the calculated data output from the calculation unit at a position corresponding to the measurement interval in which the calculation was performed;
a signal memory in which data of the input signal is stored;
a first memory control unit that outputs address information for storing the data of the input signal in the signal memory;
The arithmetic unit includes a signal arithmetic unit that performs a predetermined arithmetic operation on the input signal for each measurement interval, a second memory control unit that associates the arithmetic data with the address information, and the address information and the arithmetic data. has an arithmetic memory that stores
The display control unit performs the calculation on the calculation data by associating the calculation data with the data of the input signal stored in the signal memory based on the address information stored in the calculation memory. Display at the position corresponding to the measurement section,
The display control unit
displaying the input signal in real time in the measurement interval in which the input signal is input;
characterized in that the calculated data is displayed at a position corresponding to the measurement section in which the calculation is performed when the measurement section next to the measurement section in which the input signal for calculating the calculation data is input is shifted to the next measurement section. measuring instrument. The second memory control unit associates a non-display code with the address information corresponding to the arbitrary measurement section when the calculation is not performed for an arbitrary measurement section among the measurement sections, and the stored in operation memory,
2. The measuring instrument according to claim 1, wherein said non-display code is rewritten with said calculated data corresponding to said arbitrary measurement interval when said calculation is performed for said arbitrary measurement interval. When the non-display code associated with the address information corresponding to the arbitrary measurement interval is stored in the arithmetic memory, the display control unit outputs the arithmetic data to the arbitrary measurement interval of the display unit. is not displayed at the position corresponding to
A claim characterized in that, when the non-display code is rewritten to the calculation data corresponding to the arbitrary measurement section, the calculation data is displayed on the display unit at a position corresponding to the measurement section in which the calculation is performed. Item 2. The measuring instrument according to item 2. 4. The computing unit according to claim 1, further comprising a cycle determining unit that detects a cycle of the input signal and outputs the cycle to the signal computing unit as the measurement interval. measuring instrument. 4. The measuring instrument according to any one of claims 1 to 3, wherein the computing section has a determining section that outputs an arbitrarily set time as the measurement interval to the signal computing section. the input signals are a voltage signal and a current signal;
6. The measuring instrument according to any one of claims 1 to 5, wherein the computing section computes power based on the voltage signal and the current signal.

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