JPH11242056A - Transient state display device of instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a display device simply and selectively displaying transient response or the like, by providing a means deciding a display time scale so that a signal setting section is within the inside width of a display screen. SOLUTION: A first means samples a measuring signal to input measured sampled data d1 , d2 ..., and a second means monitors the sampling data to decide a signal setting section Te. A third means decides a display time scale so that the signal setting section Te is within the inside width except for either or both of the horizontal ends of a display screen, and a fourth means displays the input data in the signal setting section Te by the time scale. For instance, a popular note type personal computer 2 is used as the operation test device body of an automatic voltage regulator(AVR). CRT 3 and a printer 6 are connected to the personal computer 2, used as output means, and a signal converter 4 is connected as an input means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device suitable for analyzing a transient response signal of a system or a device.

[0002]

2. Description of the Related Art Devices and systems to be inspected and tested for dynamic characteristics include power systems, power devices, various electric and electronic circuits,
There are various types such as computers. In addition to conducting tests and inspections in laboratories and laboratories, there are on-site start-up tests and maintenance inspections. There is a device dedicated to verifying transient response characteristics of a power system or a circuit, or to data analysis, editing and editing for dynamic characteristic tests such as AVR. This device records and edits response characteristics from a transient response to a steady state with respect to captured data, and displays the data on a screen. In addition, there is a tester for a dynamic characteristic test. This tester requires the work of manually measuring the test signal and then reediting the transient characteristics manually or by launching analysis software separately. tool)
There is also an example that is used by adding. In addition, there is an apparatus which only takes in a signal of a transient characteristic. According to this device, a human calibrates and verifies each signal level after measurement.

[0003]

In the dedicated device,
There is a problem that editing software is complicated. Also,
The other device has a problem that human intervention is required.

[0004] It is an object of the present invention to provide a display device capable of easily selecting and displaying a transient response or the like.

It is a further object of the present invention to provide a display device capable of easily performing a time scale process such that only a transient state sufficiently enters a screen.

[0006]

According to the present invention, there is provided an apparatus for displaying a transient state of a measurement signal of a device, which samples the measurement signal and inputs measurement sample data d ₁ , d ₂ ,. When, second means for determining the monitored input data signal settling period T _e, the signal settling interval T
_e is a third means for determining the display time scale to fit inside width except the lateral width or lateral ends of the display screen, the input data d _i of the signal settling in period T _e at the display time scale, , And a fourth means for displaying _dj are disclosed.

Further, according to the present invention, in a transient state display device for two signals related to each other (at least one of which is a measurement signal), each sample is performed, and sample data d ₁₁ , d ₁₂ ,. , sample data d ₂₁ of the second signal, d _22, ..., a first means for inputting a second to determine the signal settling period T _e of the measuring signal is one signal monitors the input data means, third the signal settling interval T _e is, for determining the display time scale to fit inside width except the lateral width or lateral ends of the display screen
And the signal settling period T _{e on} this display time scale.
Input data d _1i of the inner, ..., d _1j and d _2i, ..., and d _2j,
And a fourth means for additionally displaying the information.

Further, according to the present invention, in the second means, a start point is obtained from the start of the monotonic increase (or monotone decrease) of the sample data of the measurement signal, an end point is obtained from the end, and a section connecting the start point and the end point is determined. discloses a transient state display device of the apparatus that shall be determined as the signal settling interval T _e.

Further, according to the present invention, in the second means, a starting point is determined from the start of the rising (or falling) or monotonically increasing (or monotonically decreasing) of the signal for the sample data of the measurement signal, and a reference value or a reference value indicating a steady state is obtained. It determined the end point from the time it reaches the maximum value (minimum value), a section connecting the the start and end points, and shall be determined as the signal settling interval T _e.

Further, according to the present invention, there is provided an apparatus having range switching means for performing range switching so as to eliminate mutual overlap when two signals displayed by the fourth means are displayed overlapping each other. A transient state display device is disclosed.

Further, according to the present invention, one of the signals is an input signal for controlling the control target system, and the other of the measurement signals is a response signal from the control target system generated based on the input signal. The present invention discloses a transient state display device.

Further, the present invention discloses an apparatus for displaying a transient state of a device having means for analyzing a signal of input data by looking at the display contents of the fourth means.

Further, according to the present invention, the time scale axis on the display screen is set in R increments, and the interval time width τ of the display time scale in the third means is τ> (T _e / R) R ≧ (T _e / τ) + 2ε + α (where ε is an integer of 1 or 2 or 3 and α is a value of less than 1 at the end absorption)
Disclosed is a transient state display device for a device.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a circuit diagram illustrating a dynamic characteristic test of an AVR. The AVR 1 is a circuit that automatically adjusts the voltage of a system, equipment, and the like. The AVR 1 has an AVR control circuit 10 in addition to the AVR body, and generates a control signal to an external equipment or the like from an output terminal 11. The system or equipment is subjected to voltage control by the control signal from the output terminal 11, and the control result is obtained from the transformer secondary terminal 12, and is used as a control monitor or a feedback signal.

A general-purpose notebook personal computer 2 was used as the main body of the dynamic characteristic test apparatus. PC 2 has CRT3,
A printer 6 is connected and used for output. Further, a signal converter 4 was connected as input means. By using a notebook computer, a dynamic characteristic test can be achieved without using a special-purpose machine and without the need for unnecessary manual labor. The signal converter 4 includes an insulation signal converter 40 and an AD converter 41. The insulation signal converter 40 is for inputting a detection signal from the secondary terminal 12, and is composed of a photocoupler, a transformer, and the like, and electrically separates the input and output. A
The D converter 41 digitized the signal obtained via the secondary terminal 12 and the converter 40 because the signal is an analog signal.

The notebook personal computer 2 has functions of an input process 20, a dynamic characteristic test process 21, an output process 22, a time axis / range setting process 23, an editing process 24, and a memory function 2.
Have five. It also has a keyboard and mouse, but they are omitted from the drawing. Each function is briefly described. Input processing 2
0 ... The AD conversion output of the AD converter 41 is fetched and stored in a memory (not shown) one after another. It also includes input capture by keyboards and mice. Dynamic characteristic test processing 21 ...
Decide and instruct what kind of dynamic characteristic test is to be performed by man-machine operation. The instruction is to display the contents on the CRT screen. It may have a function to perform automatic execution in accordance with instructions. The subject of the dynamic characteristics test is AVR1
There are various test items, and a test target item is designated from among them. Various setting data and software of the test items and test contents are stored in the memory and read out and displayed. The data and software of the test contents are stored in the memory and read out and displayed. (Test worker) performs a specific test while observing the displayed contents. Output processing 22: CRT3,
The display to the printer 6 and the instruction of the printout data and the output thereof are performed. It also includes how to give a display instruction using a keyboard or mouse. Setting process 23 ... which is an important feature of the present embodiment, setting of the sample period t _e or sample time T _s, even to set determination and timescale decisions and range of the signal settling period (stabilization range) . Details will be described later.
Editing process 24: A process for editing and organizing the characteristic test results. The memory function 25 stores various software, stores various setting data and work data therefor, stores measured values and analysis (analysis) results, and stores various reference values for analysis. The memory includes an IC memory, a magnetic disk, and the like. In FIG. 1, data 25a is a test condition set value for a dynamic characteristic test, data 21b is a reference value, data 25c is a measured value, and data 25d is an analysis value.

FIG. 2 shows a flowchart of a dynamic characteristic test using the dynamic characteristic test apparatus of FIG. First, step S
At 100, a dynamic characteristic test mode is selected. There are a plurality of test items for the dynamic characteristic test, and one of them is
Select with 01. When the test items are determined, the test conditions are set (S102). In the test conditions, a target measurement signal (where and what signal) (this is referred to as A) is further determined, and further, if necessary, a reference signal (where and what signal) to be compared (this is referred to as B) ), And the purpose and method of signal analysis. In FIG. 1, the control signal 11a is output from the AVR control circuit 10.
Which is the reference signal B. Further, the output signal 12a from the output terminal is taken in. This is the signal A.

The location of each of the signals A and B is determined in accordance with the purpose and method of analysis. Further, the analysis method is registered in the test software. As for the signal A, there are a generator voltage, a current, a field voltage and a current, and the like. Here, it is assumed that the transient state of the signal A is a target and the transient state is an analysis target. The signal B is of various types such as a pulse signal, an impulse signal, and a target value signal, and is determined depending on the location. FIG. 2 shows an example in which only the signal A is captured.
Note that the reception of the start key signal in step S102 indicates the depression of the test start instruction key.

In step S103, the output signal A is measured, and is taken into the personal computer 2 via the converter 4. The capture is performed in the input processing 20. AD converter 41
Samples the output signal A at a predetermined sampling period t _s and performs AD conversion. If the sample period t _s can be variously changed according to the type of the output signal A and the test items, an appropriate period can be selected according to the partner. Of course, the sample period t
_In some cases, _s is fixed for any measurement signal. In addition to, the sampling time Ts of the sampling period t _s
Is also set. Ts is also both variable and fixed. For example, Ts is several tens seconds to several tens minutes in AVR. By giving the sample period t _s and the sampling time T _s , it is possible to obtain a total of T _s / t _s sample data. As a specific example, t _s = 1 msec, T _s = 10 _sec
６０60 min.

In some cases, there are two or more output signals A to be measured. In such a case, the two or more signals are sampled simultaneously and taken into the personal computer 1 at the same time. This makes it possible to understand the phase relationship and the like. As for the method of capturing, if there are two signals, it is preferable to adopt a method of inputting with two channels. The sample measurement signals thus captured are sequentially stored in a memory and used for subsequent processing.

In step S104, the sample measurement signal is displayed online on the CRT 3 as it is. This is because the measurement signal is first monitored online. The online display can be realized by a method in which the data is not stored in the memory but is taken in and sent to the CRT 3 at the same time. However, by using a memory which can be accessed at high speed, the online display can be performed even through the memory. . This online display is a kind of horizontal scroll display because the time axis is updated one after another. Such display processing is performed by the output processing 22.

[0022] Step S105 is checked whether reaches the set sampling time T _s, to reach T _s, repeating the sample is performed, the uptake of the measurement signals is performed.

In step S106, the sampling time T
_The signal settling section is determined for the sample measurement signal data fetched in _s and temporarily stored in the memory. The measurement signal has a transient state and a steady state, and the transient state is set first as a dynamic characteristic test item. In analyzing the transient state, it is indispensable to catch a signal settling section, which is a section from the rise of the measurement signal to the reaching of the steady state.

Therefore, the signal settling section is automatically determined in the flow S106. At the same time, the time scale is determined so that this signal settling section can sufficiently enter the screen of the CRT 3.

First, several methods for automatically determining the signal settling period by software will be described below. The signal settling section is a section connecting the start point and the end point when the start point and the end point are obtained. Therefore, how to determine the start point and the end point will be described.

(1) A method of obtaining a maximum value (or a minimum value) (end point calculation method, part 1). From the rise of the measurement signal to the transition to the steady state through the transient state, the signal often undergoes a transient state accompanied by a phenomenon such as a first-order lag or a second-order lag (a monotonous increase phenomenon). In this case, the time when the steady state is reached is the time when the maximum value is reached (end point), and the section from the point of time when the signal is started up to the time when the maximum value is reached is the signal settling section.
In order to detect the maximum value, the sample measurement signal data is compared with the size of adjacent ones with the lapse of time, and until the maximum value is reached, the sample period t _{s is} delayed by the sample period t _s among the adjacent ones. When the latter sample measurement signal becomes large, and when the maximum value is reached, the magnitude relationship is lost and becomes the same value (or within a certain allowable value),
Use The point at which the magnitude relationship disappears is the point at which the maximum value is reached. An example of this end point is shown in FIG. In some cases, there is no monotonic increase between some adjacent sample points until the maximum value is reached. In this case, since there is a possibility that the maximum value may be erroneously determined at that time, it is necessary to determine the monotonous increase by performing comprehensive processing or statistical processing. Also, whether or not the maximum value has been reached is required to be statistically processed if there is a variation in signal level before and after the maximum value. Statistical processing refers to not only two adjacent signals but also three or more signals before and after or an average value thereof. In the transient state, since there is a falling type other than the rising type, in the falling type, the minimum value is detected instead of the maximum value.

(2) A method of determining whether a specified value indicating a steady state has been reached (end point calculation method 2). Whether or not the steady state has been reached can also be determined by whether or not the prescribed value has been reached. This is applied when the signal level (specified amplitude value) when the steady state has been reached is known in advance. The point in time when the specified amplitude value is reached is defined as the end point. For example, it is suitable for finding the end point of a transient state in which the vibration is repeated to reach a steady state. An example of the end point is shown in FIG.

(3) Mixing method (end point calculation method 3). If the end point is determined by combining the end point calculation methods 1 and 2, the accuracy is further improved.

(4) A method of calculating a signal rising (or falling) (starting point calculation method 1). The starting point of the transient state is determined when the measurement signal changes from “zero” (for example, a steady state value) to “present”. This is determined by giving a small allowable value as a criterion. A method is adopted in which a point is set to a point when the value becomes “existent” beyond a minute allowable value. Examples of the starting point are shown in FIGS. Even if the transient state is not the rising type, but the falling type, “Yes” only changes from positive to negative.

(5) A method of calculating the signal rising (or falling) from a monotonically increasing (or monotonically decreasing) phenomenon (starting point calculation method 2). In the starting point calculation method 1, determination of “zero”
It may be difficult to determine “Yes”. Therefore, it is determined whether or not the start of the place having “Yes” has started based on whether or not the monotonous increase tendency has been reached. There is also a method of determining “zero” and monotonic increase by statistical processing. That is, in the transient state,
Since there is a certain kind of amplitude variation, the difference was compensated by statistical processing, and the rise was detected by observing a monotonous increase. A specific example will be described with reference to FIG.

In FIG. 4A, before the signal rises, the amplitude value has a slight change. This variation is due to the influence of noise, but it is necessary to remove such variation. Therefore, we have set up small tolerance C _1, fluctuation components in such within tolerance C ₁ treats to ignore. Therefore, FIG.
(A), the but there are sections that the variation in tolerance C _1, which is treated as the signal null. Also, the allowable value C ₁
May be given as an absolute value, but may be given as a relative value (that is, an allowable percentage ratio to the maximum amplitude value). In this case, for example, C ₁ is set to about ± 1%. C
_{When 1} = ± 2%, the error is large, and when C ₁ = ± 0.1%, the sensitivity is considered to be severe. However, it is preferable to finally determine the sensitivity depending on the characteristics and the purpose of the signal.

In FIG. 4A, the starting point may be a point when the value exceeds the allowable value C _1. However, if a factor of whether or not the value is monotonically increased is added, the calculation accuracy of the starting point is increased. This is shown in FIG. 4 (b). That is, the allowable value C ₁
Since it is considered that the rise of the signal starts from the time when the threshold value is exceeded, it is determined whether or not the rise for the signal actually occurs. The determination method is based on the monotone increase determination formula of Equation 1.
Here, t ₁ , t ₂ ,... Represent each sample time, V ₁ , V ₂ ,
... are amplitude values at each sample time. t ₁ , t ₂ -t
_1, t ₃ -t _2, ... correspond to the sampling period t _s, respectively.

[0033]

(Equation 1) By using Equation 1, it is determined that a rise has occurred when each absolute value is greater than “1” by repeating n times (for example, n = 10) continuously. Then, from the time point (value) exceeding the first C ₁ (backward in time series), C
₂ (However, C ₁ > C _{2. If} C ₁ = ± 1%, C ₂ = ± 1%
0.5%) is defined as a change start point (start point).

(6) Start point calculation method End point calculation method using the second method. The start point calculation method 2 can also be used for the end point calculation method. When the steady state is entered after the monotonous increase, the amplitude value becomes stable. Whether or not this stable state has been entered is determined by the allowable value C _1.
Is determined. Further, unlike Equation 1, a stability determination equation is used as in Equation 2. Here, t ₁ , t _2, ...
V ′ ₁ , V ′ ₂ ... Are amplitude values for each sample point.

[0035]

(Equation 2) Using Equation 2, n times (for example, n = 10) is repeated continuously, and if each absolute value is smaller than "1", it is determined that a stable state has been entered. Then, from the time (value) of first entering the range of C ₁ , the time progresses in chronological order and reaches the value of C ₂ (or C ₃ different from C ₂ , preferably C ₂ > C ₃ ). Is the stable point (end point).

Next, the method of determining the time scale will be described in detail. The measurement signal can be governed by a time axis and an amplitude axis. To display this on the screen of the CRT 3, the measurement signal data is displayed by taking the time axis on the horizontal axis of the screen and the amplitude axis on the vertical axis of the screen. On the other hand, the screen has a pixel size (length × width = m pixels × n pixels. For example, m = 600, n
= 800). When the horizontal axis of such a screen is set as a time axis, this time axis is called a time scale. The time axis is (nsec order to msec order to s
It is variable as in the order of ec to the order of hour, and can be manually selected and set to any of them. The present invention is characterized in that the time scale is automatically determined by software so that all the sample measurement signal data within the previously set signal settling section can be sufficiently displayed within the width of the CRT screen. One.

Next, the automatic determination of the time scale will be described. Here, the time scale is a time axis and a time interval of the display screen. In relation to the signal settling section, all the sample measurement signal data belonging to the automatically determined signal settling section are displayed on the display screen. It is to determine a time scale consisting of a time axis and time steps. Then, these data are displayed according to this time scale, and the time axis and the time interval are also displayed. For example,
If the automatically determined signal settling period is 800 msec, 800 sample measurement data exist in this signal settling period when the sample period t _s is 1 msec. Therefore, the time scale is determined so that the 800 sample measurement data can be displayed on the width of the CRT screen (800 pixels or dots; the same applies hereinafter). Further, for example, when the signal settling section is 400 msec, 400 sample measurement data exists in the signal settling section when the sample period is 1 msec. Therefore, the time scale is determined so that the 400 sample measurement data can be displayed on the horizontal width (800 pixels) of the CRT screen. It should be noted that the data may be thinned out and displayed, but is not directly related to the time scale.

Since it is difficult to observe both ends of the display screen in the horizontal direction, the number of pixels at both ends which are difficult to observe is
It is preferable to remove from the display target area. This area width is ε
, The signal settling section is adjusted to the pixel equivalent width of (800−2ε) excluding both sides.

FIGS. 5A and 5B show display examples of the time axis determined by the time scale and the unit time on the display screen.
Shown in The number of time steps R in the horizontal direction is, for example, twelve. In many cases, this number is determined in advance so as to be easily observed depending on the size of the CRT screen. There are also examples of eight or sixteen other than twelve. As shown in FIG.
In order for the time step number 12 to be fully within the signal settling section,
It determines the time scale. Then, the time axis T is displayed at the bottom of the screen, twelve unit scale times (0, 10, 20,..., 120) are displayed on the time axis, and the time base (msec) D is also displayed. I do. FIG.
(B) is an example in which the step scale time is set to 0, 1, 2,..., 12, and “(× 10 msec)” is displayed as the time source D. The step time width τ (10 msec in FIGS. 5A and 5B) is automatically obtained from, for example, the following relational expression. However, the number of steps R was set to 12 (thus, for generalization, “12” may be replaced with R).

[0040]

(Equation 3) Here, tau is the time step width, T _e is the signal settling interval duration,
2ε is an excluding area on both sides (one side width is ε, however,
The width here is an integer multiple of the step time width; that is, the area is set in units of the step time width), and α is the signal setting section (time width) as an integer value. It is the difference from the actual value when rounded down below the decimal point. Τ is selected so as to satisfy the two equations (a) and (b) of Equation 3. Equation (3) in Equation (3) is an equation for setting the signal settling section Te smaller than the total time width (τ · 12) of the twelve step durations. And the formula covering the deduction.

For example, measurement time (sampling time) 15
Second, the signal settling period is 7 when the sampling period is 1 msec.
The display timing by automatic scrolling of the data set to 88 seconds is calculated from the above equation (A) as (τ · 12)> 7.88.
From (≒ 8), it is calculated that τ = 1.0 second. In the display, the signal settling section is automatically scrolled according to the display timing from the sampling time when the last value of the integer settling time of 8 seconds calculated by rounding up the decimal point of 0.88 is taken in. In order to automatically display at the maximum timing in the center of the screen by this automatic scrolling, a tick (timing) frame 12
When eight of the signals are used for the signal settling section, ε = 2 and α = 0, and if substituted into equation (b), 1
From 2 ≧ {(8/1) + 2.2 · 2 + 0}, the left and right
2 ", and an equality relationship is established. Therefore, the signal settling section is displayed in eight frames at a timing of 1 second with two frames left and right on the screen in the predetermined drawing range. 8-7.88 = 0.1 of the difference from the actual value rounded up at this time
Two seconds are absorbed as α in the right side of the horizontal scroll in time series.

As a candidate for τ, a value that can be easily observed as an interval time width is used. For example, numerically, τ = 1, 2,
5, 10, 20, 50, 100, 200, 500, and the time source is msec, sec, m
in. As ε, 1, 2,
3, etc. (the unit is the step time τ), but if ε = 3, both sides are large and there is a possibility that the display space is wasted.

FIG. 6 shows an example of the case where ε = 1 in equation (3). The width of the screen is X _0, and twelve time steps are equally (width τ) within the width X ₀ .
On both sides, an empty portion of one frame (one step) ε is made. Therefore, the signal settling period T _e is are to fit in the frame from the second frame th to 11 frame. Furthermore, it is selected inside by α.

Returning to the description of the flow of FIG. Flow S10
Reference numeral 7 performs display on the screen based on the signal settling section and the time scale obtained in the flow S106, and performs characteristic analysis on the screen automatically or by man-machine communication. The contents of the characteristic analysis include obtaining a maximum value, a minimum value, a rise time, a delay time, an overshoot time, a self-constant, and the like. Further, these values are stored in the memory. A specific description of the characteristic analysis is omitted because it is not the object of the present invention.

In step S108, it is checked whether or not the form editing is selected. The analysis result may be edited or tabulated, and this check is performed in flow S108.
If yes, the form is edited in flow S109, and the process ends.

FIG. 2 shows an example in which only one signal is fetched, but there is also an example in which two or more signals are fetched. FIG. 1 shows an example in which a control signal 11a and a measurement signal 12a are captured. In this case, examples of the control signal 11a include a pulse signal. These two signals 11a and 12a are displayed together with the display screen. The signal settling section and time scale are determined only from the signal 12a. 2 signals 11a and 1
By displaying 2a together, characteristic analysis (S107) including the phase relationship between the two signals can be performed.

On the other hand, when the two signals 11a and 12a are displayed, they are displayed overlapping on the screen, which may hinder the characteristic analysis. In such a case, it is necessary to adjust the range so that the two are not displayed overlapping. FIG. 7 shows such a flow. In FIG. 7, the flow S111 to S114
Indicates a process for eliminating overlap. First, the flow S1
The two sample signal data 11a and 12a are displayed according to the signal setting section and the time scale determined in step 10. In the flow S111, it is visually checked whether or not there is any overlap. If there is an overlap, a signal for which range switching is to be performed is designated among the signals 11a and 12a in a flow S112. For example, the signal 11a is specified. With respect to this signal 11a, a position where the amplitude level is zero (or 0%) is detected, and then, from this position, the upper limit value is, for example, 100%.
Perform range shift to (full span) position (flow S1)
13, 114). FIG. 8 shows an example of the range switching. If they do not overlap, it may be switched to a position that does not reach 100%. FIG. 8 also shows a calculation example for the start point and the end point. In this example, the starting point is obtained from the signal 11a and the ending point is obtained from the signal 12a.

The processing for eliminating the overlap (flow S
Steps S110 to S114) may be performed after the characteristic analysis is completed (after the flow S107 or after the flow S109).

There are other range switching methods to further eliminate the overlap. First, there is a display method in which the amplitude value of the signal to be shifted is reduced (reduced) to eliminate the overlap. There is also a display method in which the reduction of the amplitude value and the movement of the vertical position are combined to eliminate the overlap. The amplitude value (for example, 100 V) is displayed on the screen. Even in the case of reduction, the numerical value as the original amplitude value is, for example, 10
Display as 0V. FIGS. 11A and 11B show examples of various shifts in the vertical direction of the display screen. FIG. 11A shows a section of 50% to 70% of the vertical full range, FIG. 11B shows a section of 0% to 20%, and FIG. ) Is an example of a section of 80% to 100%. You only have to select one so that it does not overlap.

FIG. 9 shows an example in which four signals a, b, c, and d are taken in the automatic system voltage establishment test. Only the signal a (control signal) is displayed without overlapping. Signal b,
c and d are the response signals. At the bottom of the display screen, a processing menu is displayed. The processing menu includes start, stop, enlargement display, partial enlargement, analysis display, waveform range / position change, printing, reading, and returning to the previous screen.

The display example of FIG. 9 is not particularly related to the example of determining the signal settling section. Some signals are displayed in the signal settling section,
Certain signals are shown, including those in steady state. This is because the transition periods may be different from each other. Further, it may be considered as an example in which all the sample signals captured online are displayed. In this case, as a menu,
Select and display the menu "Enlarged display or partial enlargement". By using this menu, you can freely select the required time width and the number of data.

When the dynamic characteristic test data is displayed as a graph over time in a predetermined display area, the sample period and A /
Based on the relationship between the number of samples (N) determined by the scan clock of the D-converter and the number of pixels on the time axis of the predetermined display area (800 × 600 pixels on the screen), display data takes out all of the captured values and a specified range. Equipped with a function that can be displayed inside. This makes it possible to display a graph according to the number of samples in the same display range, even if the sample period changes, so that the entire display, enlarged display, or partial enlarged display is performed in the same display range. Or, in the case of enlarged display, unlike the method of normal partial enlargement of the entire display (moving in the enlarged space by virtual space and enlarging and displaying as scroll), the display range of the display screen is specified (fixed)
To reduce the display time by using the real space as this specified range,
Since the number of samples per display time is calculated and displayed for all objects, there is a feature that it is easy to identify details and a large amount of memory can be saved.

To perform such enlarged display and partial enlargement,
Usually, a virtual space is often used. In this virtual space, a necessary display is performed by scrolling. However, in the present invention, the signal settling section and the time scale can be determined,
This can be achieved in real space by using the menu of “enlarged display and partial enlargement” based on that. In other words, the conventional calculation of the magnification in the virtual space is a method of scrolling within this space and displaying it within a specified range of the screen ((a) of FIG. 10), for example, on a screen of 800 × 600 pixels at a sampling period of 1 msec for 30 seconds. At the time of measurement, (1,000 / sec) × 3
Since 0 seconds = 30,000 data are taken in, the horizontal axis (time axis) scale in the virtual space is 30,000. Although this number is independent of the size of the virtual space, this size has a limit and is linked to the memory. If the timing step is set to 1 second by the enlargement operation, the screen has 12 timing step areas (time frames), and therefore, the display is 12 seconds. If the recording is 30 seconds, the virtual space is (30, 0).
00/12) × 800 times the size of the data, 30,0
Of the 00 captures, 12,000 are specified in 12 seconds, and 800 of the number of pixels in the display range of the screen are thinned out and displayed. This is too large, requires a considerable number of memories, and poses a limit that cannot be realized. In other words, since the scroll limit is exceeded, functions such as display enlargement with a sample period such as 1 msec cannot be used.
It becomes 50 msec or more and the accuracy is lowered.

On the other hand, when the measurement is performed under the same conditions as described above, the present invention employs a method in which the designated screen is set to the real space (FIG. 10 (b)). Since the recording time is 30 seconds, the number of seconds from the start of the display to the display for 12 seconds is calculated at the designated timing (= magnification). In other words, since the calculation is performed using the command of changing the timing or scroll as a trigger, it is possible to save a lot of memory without using much memory, and it is possible to expand the scroll without limit.

The automatic dynamic characteristic test by the transient state display device having a transient response characteristic such as AVR according to the present embodiment described above is an automatic dynamic characteristic test and verification. As a matter of course, it is possible to make paperless and preventive maintenance by centrally managing data on LAN. In addition, quality can be maintained by automatic determination of the quality of measurement data. The graph display of test data is automatically displayed in accordance with the sample period, and all the captured data can be displayed, so that a highly accurate drawing display is possible. For this reason, identification and examination of test results can be facilitated.
According to the present invention, work efficiency can be improved and labor can be saved. Test verification time can be reduced from 8 hours in the past to 1 hour in this time, and especially, the time required for analyzing and organizing dynamic characteristic test data can be reduced by 70% as compared with the conventional case, making it possible to greatly reduce man-hours. Was.

Although the signal settling section has been described, it is needless to say that the signal settling section can be used for calculating a characteristic section arbitrarily according to the character and state of the signal.

[0057]

According to the present invention, the on-site test of the equipment can be automated with high accuracy, the data graph display can be automatically displayed according to the sample period, and the identification and judgment of the result can be performed with high data density and high accuracy display. Easy to do.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a processing flowchart.

FIG. 3 is an explanatory diagram for obtaining a signal settling section.

FIG. 4 is an explanatory diagram for obtaining a signal settling section.

FIG. 5 is a display example diagram on a time scale.

FIG. 6 is a display example diagram on a time scale.

FIG. 7 is another processing flowchart.

FIG. 8 is a diagram showing an example of displaying two signals.

FIG. 9 is a diagram illustrating a display example in an automatic system voltage establishment test.

FIG. 10 is a comparative diagram of a virtual space and a real space.

FIG. 11 is an example of a vertical shift.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AVR 2 Laptop computer 3 CRT 4 Signal converter 5 Printer

Claims (9)

[Claims] An apparatus for displaying a transient state of a measurement signal of a device, a first means for sampling the measurement signal and inputting measurement sample data d ₁ , d ₂ ,... And monitoring the input data. Te second means for determining a signal settling interval T _e, the signal settling interval T _e is the third to determine the display time scale to fit inside width except the lateral width or lateral ends of the display screen means and the input data d _i of the signal settling in period T _e at the display time scale, ..., transient display devices comprising a fourth means for displaying d _j, a. 2. In a transient state display device of two signals related to each other (at least one of which is a measurement signal), sampling is performed on each of them, and sample data d ₁₁ , d ₁₂ ,. Sample data d ₂₁ of the signal of
d _22, ..., a first means for inputting a second means for determining a signal settling period T _e of the input data monitoring to measure the signal which is one of the signals, the signal settling interval T _e is , third means and the input data d _1i in the signal settling interval T _e at the display time scale for determining the display time scale to fit inside width except the lateral width or lateral ends of the display screen, ..., a fourth means for displaying d _1j and d _2i ,..., d _2j together; 3. In the second means, a start point is obtained from the start of monotonic increase (or monotone decrease) of sample data of the measurement signal, an end point is obtained from the end, and a section connecting the start point and the end point is defined as a signal. transient state display device of the device according to claim 1 or 2 and shall be determined as the settling interval T _e. 4. The method according to claim 2, wherein the rising (or falling) of the signal is performed on the sample data of the measurement signal.
Or find the starting point from the start of monotonic increase (or monotone decrease),
Determined the end point from the time it reaches the reference value or the maximum value indicating the steady state (minimum value), a section connecting the the start and end points, the signal settling period claim 1 or 2 of the instrument and shall be determined as T _e Transient state display device. 5. The apparatus according to claim 2, further comprising range switching means for performing range switching so as to eliminate mutual overlap when the two signals displayed by the fourth means are displayed overlapping each other. Transient state display device. 6. A signal according to claim 2, wherein one of the signals is an input signal for controlling the control target system, and the other measurement signal is a response signal from the control target system generated based on the input signal. Equipment transient status display device. 7. The transient state display device for a device according to claim 1, further comprising means for analyzing a signal of the input data by looking at a display content of the fourth means. 8. The time scale axis on the display screen is:
The time interval τ of the display time scale in the third means is τ> (T _e / R) R ≧ (T _e / τ) + 2ε + α (where ε is an integer of 1 or 2 or 3) , Α is a value less than 1 in the end absorption))
The transient state display device for a device according to claim 1 or 2, wherein: 9. The transient state display device according to claim 8, wherein the number of steps R is R = 12.