JP5702532B2 - Real time waveform recorder - Google Patents

Description

  The present invention relates to a real-time waveform recorder, and more specifically, to a real-time waveform recorder capable of arbitrarily and easily changing calculation items and the like without ending the measurement itself even during real-time calculation processing. Is.

  In the real-time waveform recorder, A / D conversion is performed on the measured signal such as current and voltage measured from the measured object at the input unit, and the measured data is stored in the memory while the calculation items are set before starting the measurement. Real-time calculation is performed for (for example, average value calculation or peak value calculation), and the calculation result is displayed on a display screen including a liquid crystal display panel together with the real-time waveform of the signal under measurement (for example, Patent Document 1).

  According to this, it is possible to accurately grasp the real-time waveform of the signal under measurement that changes every moment and the specific phenomenon that the waveform has from the calculation result.

Japanese Patent Laid-Open No. 8-146045

  However, in the related art including the invention described in Patent Document 1, the problem is that the calculation items and measurement conditions set before the start of measurement cannot be easily changed after the start of measurement. There is.

  In other words, real-time computation during measurement is performed within the range of data measured up to now from the start of measurement, but during the measurement, the previous computation results are cleared, and the subsequent data is newly real-time. The operation cannot be performed.

  Similarly, during the measurement, the calculation result so far cannot be cleared, the calculation type (calculation item) can be changed, and the calculation after the change cannot be performed on the subsequent data.

  Therefore, an object of the present invention is to provide a real-time waveform recorder capable of arbitrarily and easily changing the start time of real-time calculation, calculation items, and the like even during measurement.

In order to solve the above problems, the present invention stores an input unit having an A / D converter to which a signal under measurement is input, and measurement data of the signal under measurement subjected to A / D conversion at the input unit. A memory; a display unit having a display screen; a control unit having a calculation function for controlling the writing and reading of the measurement data to the memory and the display unit; and an operation unit for giving a predetermined instruction to the control unit. The real time waveform recorder displays the calculated value together with the waveform of the signal under measurement on the display screen while sequentially calculating the measurement data in real time for the predetermined calculation item instructed by the operation unit. In
The control means interrupts the real-time calculation while sequentially writing the measurement data to the memory without ending the measurement itself when an instruction to stop the calculation is issued from the operation unit during the real-time calculation of the measurement data. The calculation result so far is cleared, and a calculation item selection menu and a calculation restart position selection menu for selecting the measurement data position when the real-time calculation is restarted are displayed on a part of the display screen. The operation unit selects a predetermined calculation item from the calculation item selection menu, and after the predetermined measurement data position is selected from the position selection menu at the time of restarting the calculation, an instruction to restart the calculation is displayed. Is displayed, the calculation item selected from the calculation item selection menu is displayed in the position selection menu when restarting the calculation. It is characterized in that to resume the real-time computation of La selected predetermined measurement data location on the memory.

According to the onset Ming preferred embodiment, the above-mentioned operation at the restart position selection menu includes at least the operational point of interruption, the measurement starting point before the operation resuming time and operational interruption, at the operating unit, the real-time The measurement data position when the calculation is resumed can be selected from any of the calculation interruption time point, the calculation resumption time point, or the measurement start time point before the calculation interruption.

Further, the present invention includes a plurality of input channels as the input unit, and the control means further displays a channel selection menu on a part of the display screen when the real-time calculation is interrupted, A mode in which a predetermined calculation item can be selected from the calculation item selection menu for a specific input channel selected from the channel selection menu is also included. Further, it is preferable that the calculation item is selected from an average value, a peak value, a maximum value, a minimum value, a maximum value time, and a minimum value time.

According to the onset bright, "operational pause" disrupting the real-time calculation function, because it has to resume the real-time operation "operation resume" function and the "operation item selection" function, real-time at any time during the measurement by interrupting the operation, after changing the operation item from "operation item selection" function, computation interruption time, from either the start of measurement of before the operation resuming point or operation interruption, it is possible to resume the real-time operation.

1 is a block diagram showing a basic configuration of a real-time waveform recorder according to an embodiment of the present invention. The display screen figure which shows the display form before a calculation interruption. The display screen figure which shows the display form at the time of calculation interruption. The display screen figure which shows the display form at the time of calculation resumption.

  Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 4, but the present invention is not limited to this.

  As shown in FIG. 1, the real-time waveform recorder according to this embodiment includes an input unit 10, a control unit 20, a storage unit 30, an operation unit 40, a display unit 50, and a recording unit 60 as a basic configuration. ing.

  The input unit 10 includes an A / D converter, and A / D converts an analog signal to be measured from a device to be measured (not shown) into digital measurement data.

  The control unit 20 includes a CPU, a microcomputer, and the like, and controls writing / reading of measurement data A / D converted by the input unit 10 to / from the storage unit 30 and a display form of the display unit 50.

  The storage unit 30 includes a RAM (Radom Access memory) 31 and a ROM (Read Only Memory) 32. Measurement data is sequentially written in the RAM 31, and an operation program of the control unit 20 is stored in the ROM 32. In the following description, the RAM 31 may be referred to as a memory.

  For the operation unit 40, a keyboard, a mouse, or the like may be used. The display unit 50 includes a display screen 50a (see FIGS. 2 to 4) formed of a liquid crystal display panel, a plasma display, or the like. The recording unit 60 may be a printer that prints measurement waveforms, measurement data, and the like on recording paper.

  Referring to FIG. 2, a display screen 50a includes a waveform display unit 51, a calculation value display unit 52 that displays a calculation value (calculation result), a measurement start time display unit 53, a scroll bar display unit 54, and a sampling interval display unit. 55a and a unit time display unit 55b of a time axis scale are provided, but according to the present invention, a calculation interruption instruction unit 56a that interrupts real-time calculation and a calculation restart instruction unit 56b that restarts real-time calculation are also provided. Is provided.

  Next, an example of the operation of the control unit 20 will be described. The signal input system has two channels, CH1 and CH2, the sampling interval is set to 10 ms, and the time axis scale (1 DIV.) Unit time of the waveform display unit 51 is set to 100 ms prior to the start of measurement. It is assumed that “average value” calculation is selected for the item.

  When the measurement start signal is output from the operation unit 40, the control unit 20 writes each measurement data of the channels CH1 and CH2 A / D converted by the input unit 10 into the memory 31 sequentially, and then outputs the channels CH1 and CH2. These real-time waveforms (real-time waveforms) are displayed on the waveform display unit 51 with different line types and colors, for example.

  In addition, the measurement start time (in this example, July 10, 2009, 11:41:27) is displayed on the measurement start time display unit 53, and the actual time currently displayed in the scroll bar display unit 54 is displayed. A scroll mark M indicating the position of the waveform with respect to the memory area of the memory 31 is displayed.

  Further, with respect to measurement data from the first measurement data at the start of measurement written in the memory 31 of each channel CH1 and CH2 to the present time, the respective average values are calculated in real time, and the calculated values are displayed as the calculated value display unit 52. To display.

  When the measurement interruption instruction unit 56a is selected by, for example, a mouse operation of the operation unit 40 in the state where the measurement is performed in this way, the control unit 20 interrupts the real-time calculation, and as shown in FIG. The calculation interruption instruction unit 56a is highlighted, and a calculation item selection menu 57 and a calculation restart position selection menu 58 are displayed at predetermined parts of the display screen 50a.

  In this embodiment, the calculation item selection menu 57 includes “calculation OFF”, “average value”, “peak value”, “maximum value”, “minimum value”, “maximum value time”, and “minimum value time”. 7 items are included.

  The calculation restart position selection menu 58 includes a first selection item 58a for setting the calculation restart position as “position at restart”, a second selection item 58b for “position at interruption”, and “measurement start position”. Three items of the third selection item 58c are included.

  The measurement data is sequentially written in the memory 31 even when the calculation is interrupted, and the “resumption position” is the position of the measurement data written in the memory 31 when the calculation resumption instruction unit 56b is selected, as will be described later. It is.

  The “position at the time of interruption” is the position of the measurement data written in the memory 31 when the calculation interruption instruction section 56a is selected as described above, and the “measurement start position” is the memory 31 at the start of measurement. This is the position of the head measurement data written in.

  Here, for example, the “maximum value” calculation is selected from the calculation item selection menu 57 by the mouse operation of the operation unit 40 and the “resume position at restart” is selected from the calculation restart position selection menu 58, for example. It is assumed that the instruction unit 56b is selected.

  Then, as shown in FIG. 4, the control unit 20 highlights the calculation resumption instruction unit 56 b, and calculates the “maximum value” for the subsequent measurement data from the measurement data when the calculation resumption instruction unit 56 b is selected. Is executed in real time, and the calculated value is displayed on the calculated value display unit 52. In addition, the measurement start time display unit 53 displays the time at which the calculation is resumed (in this example, July 10, 2009, 12:49:16).

  When “measurement start position” of the third selection item 58c is selected in the position selection menu 58 at the time of resuming computation, the “maximum value” computation is performed in real time for the measurement data from the measurement data at the measurement start time to the current time. Will be executed.

  In the above embodiment, the calculation items of the channels CH1 and CH2 are both changed from the “average value” calculation to the “maximum value” calculation. For example, the channel selection menu is displayed and the calculation item is changed only for one channel. You can also.

  Also, for one channel, the calculation item is changed from “average value” calculation to, for example, “peak value” calculation, and for the other channel, the calculation item is changed from “average value” calculation to, for example, “minimum value” calculation. You can also.

  In addition, when the calculation interruption instruction unit 56a is selected several times for the “measurement start position” of the third selection item 58c of the position selection menu 58 at the time of resuming the calculation, the previous time before the calculation is interrupted. The position of the measurement data written in the memory 31 when the calculation is interrupted can also be set as the “measurement start position”.

  For example, if the current calculation interruption is the third time, the position of the measurement data at the time when the calculation was interrupted the second time before that may be set as the “measurement start position”. Also, if the current computation is interrupted for the fourth time, the position of the measurement data at the time of the second computation interruption at the third or previous two times may be set as the “measurement start position”. it can.

  As another aspect, when there is no need to change the calculation item set before the start of measurement, the calculation interruption selection unit 56a omits the calculation item selection menu 57 from being displayed after the calculation is interrupted, and the calculation restart position. Only the selection menu 58 is displayed.

  Then, after selecting either “resume position” or “interrupt position” from the computation restart position selection menu 58, the computation resume instruction section 56b is selected to select “resume position” or “interrupt position”. The real-time calculation is resumed for the subsequent measurement data.

  In addition, in the said embodiment and said another aspect, when a calculation is interrupted by the calculation interruption instruction | indication part 56a, it is preferable that the calculation result until then is cleared.

  As described above, according to the present invention, the real-time calculation start time can be set to an arbitrary time other than the measurement start time. It can be calculated.

10 input unit 20 control unit 30 storage unit 31 RAM
32 ROM
40 Operation section 50 Display section 50a Display screen 51 Waveform display section 52 Calculation value display section 53 Measurement start time display section 54 Scroll bar display section 56a Calculation interruption instruction section 56b Calculation restart instruction section 57 Calculation item selection menu 58 Calculation restart position selection menu

Claims (4)

An input unit having an A / D converter for inputting a signal under measurement; a memory for storing measurement data of the signal under measurement subjected to A / D conversion at the input unit; and a display means having a display screen; And a control unit having a calculation function for controlling the writing and reading of the measurement data to the memory and the display unit, and an operation unit for giving a predetermined instruction to the control unit. The control unit is instructed by the operation unit. In the real-time waveform recorder that displays the calculated value together with the waveform of the signal under measurement on the display screen while sequentially calculating the measurement data sequentially for the predetermined calculation item that has been performed,
The control means interrupts the real-time calculation while sequentially writing the measurement data to the memory without ending the measurement itself when an instruction to stop the calculation is issued from the operation unit during the real-time calculation of the measurement data. The calculation result so far is cleared, and a calculation item selection menu and a calculation restart position selection menu for selecting the measurement data position when the real-time calculation is restarted are displayed on a part of the display screen. The operation unit selects a predetermined calculation item from the calculation item selection menu, and after the predetermined measurement data position is selected from the position selection menu at the time of restarting the calculation, an instruction to restart the calculation is displayed. Is displayed, the calculation item selected from the calculation item selection menu is displayed in the position selection menu when restarting the calculation. Real-time waveform recorders La selected predetermined measurement data position on the memory, characterized in that to resume the real-time operation.   The calculation resumption position selection menu includes at least the calculation interruption time point, the calculation resumption time point, and the measurement start time point before the calculation interruption, and the measurement data when the real-time calculation is resumed at the operation unit. The real-time waveform recorder according to claim 1, wherein the position can be selected from any of the calculation interruption time point, the calculation resumption time point, or the measurement start time point before the calculation interruption.   The input unit includes a plurality of input channels, and the control means further displays a channel selection menu on a part of the display screen when the real-time calculation is interrupted, and the operation unit selects from the channel selection menu. 3. The real-time waveform recording according to claim 1, wherein a predetermined calculation item can be selected from the calculation item selection menu and the measurement data position can be selected from the calculation restart position selection menu for the specified input channel. Total. The above operation item, the average value, peak value, maximum value, minimum value, according to any one of claims 1, characterized in that it is selected from among the hours of time and the minimum value of the maximum value 3 Real time waveform recorder.

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