JP5851121B2 - Waveform recorder - Google Patents

Description

  The present invention relates to a waveform recording apparatus that starts recording waveform data when a trigger condition is satisfied.

  At the measurement site, various phenomena to be measured such as voltage, current, power, frequency, temperature, humidity, water volume, pressure, etc. are detected by sensors, and the waveform data of the detection signal is recorded in a recording unit such as semiconductor memory or hard disk. Many waveform recording devices are used. For example, the applicant discloses in Japanese Patent Application Laid-Open No. 2004-151820 a waveform recording apparatus that starts recording in a data recording unit when the value of waveform data (sampling data) of a measured input signal exceeds a trigger level. .

JP 2009-92459 A

  The measurer analyzes the phenomenon to be measured based on the recorded waveform data, but there are cases where the analysis is performed by paying attention only to some specific ranges in the waveform data, not the entire waveform data. In such a case, it is necessary to extract only a specific range necessary for the analysis from the waveform data. As the number of the ranges increases, more complicated work is required for the extraction.

  For example, when the flow rate of water flowing in a water pipe is increased stepwise at regular intervals, the maximum or minimum value of the water pressure in each range where the flow rate is almost constant in the step shape may be investigated. is there. In such a case, the measurer first extracts the range where the flow rate is almost constant from the waveform data of the recorded flow rate, extracts the waveform data of the water pressure so as to correspond to each range, and extracts it. It is necessary to select the maximum value and the minimum value from the water pressure waveform data in each range.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a waveform recording apparatus capable of selectively sequentially recording only a specific range of waveform data.

The waveform recording apparatus according to claim 1, which is made to achieve the above object, is a waveform data recording unit that records waveform data whose level increases or decreases stepwise at regular time intervals. In the waveform data recording unit, an initial value of a trigger condition value for starting recording of the waveform data and an end condition of the recording so that a range of the waveform data at a certain level can be recorded. Preliminarily storing change information that is a predetermined shift value for shifting the value of the trigger condition by sequentially adding to or subtracting from the value of the trigger condition and the predetermined time as a time for continuing a certain recording A recording condition recording unit that performs the start and end of recording of the waveform data in the waveform data recording unit in correspondence with the trigger condition and the end condition, and sets the value of the trigger condition based on the change information. initial value Characterized in that it comprises a recording control section which run et sequentially changed.

The waveform recording apparatus according to claim 2 is the waveform recording apparatus according to claim 1 , wherein the setting unit can set at least one of an initial value of the trigger condition, the end condition, and the change information. It is characterized by providing.

A waveform recording apparatus according to a third aspect is the one according to the first or second aspect , wherein the trigger condition is defined by a level trigger or a window trigger.

A waveform recording apparatus according to a fourth aspect of the present invention is the waveform recording apparatus according to any one of the first to third aspects, wherein the recording control unit is configured to start and end the recording of the waveform data in the waveform data recording unit. In conjunction with this, another waveform data is recorded together with the waveform data.

A waveform recording device according to claim 5 is the one according to claim 4 , wherein the waveform data recorded in the waveform data recording unit and / or each of the other waveform data are calculated. An arithmetic processing unit that performs processing is provided.

  According to the waveform recording apparatus of the present invention, the waveform condition data is obtained by sequentially changing the value of the trigger condition for starting the recording of the waveform data from the initial value based on the change information for changing the trigger condition. It is possible to selectively record only a necessary range in the list.

  When the information for change is a predetermined shift value for shifting the value of the trigger condition by sequentially adding or subtracting from the value of the trigger condition, only a specific range in the waveform data that increases or decreases is included. Can be recorded selectively. For example, it is possible to record only waveform data in a range where the level is almost constant in the waveform data whose level increases or decreases stepwise.

  When the change information is the value of the trigger condition itself associated with the recording order of waveform data, the range of waveform data to be recorded can be individually set for each recording order, so the recording range is set in more detail. be able to.

  When the end information is a recording time for which recording is continued, for example, when the waveform data has a level that changes every constant time, the end information of the waveform data can be easily obtained by setting this constant time as the recording time. Can be set. When the end information is a value of waveform data for ending recording or a relative value with respect to the value of the trigger condition, a necessary range of the waveform data can be defined by a level together with the trigger condition.

  When equipped with a setting unit that can set at least one of the initial value, the end condition, and the change condition of the trigger condition, the recording condition can be set according to the waveform data to be recorded. It can be set as a recording device.

  When the trigger condition is a level trigger or a window trigger, the trigger condition can be easily set, and the apparatus can be used conveniently.

  When the recording control unit causes the waveform data recording unit to record other waveform data together with the waveform data in conjunction with the start and end of waveform data recording, select only the necessary range for multiple waveform data Can be sequentially recorded.

  When performing arithmetic processing on each waveform data and / or each other waveform data recorded in the waveform data recording unit, for example, the maximum value, the minimum value, and the average value of the waveform data and / or other waveform data Measure the standard deviation, etc., calculate the calorie by further multiplying the liquid flow rate calculated from the waveform data and the temperature increase calculated from other waveform data Since numerical values and the like necessary for the analysis of the target phenomenon are automatically calculated, it is possible to easily analyze the measurement target phenomenon.

1 is a block diagram of a waveform recording apparatus to which the present invention is applied. It is a schematic diagram which shows the setting screen of the recording conditions in the waveform recording device to which this invention is applied. It is a flowchart of the waveform recording device to which the present invention is applied. It is a wave form diagram for demonstrating the recording state of the waveform recording device to which this invention is applied. It is a schematic diagram which shows the setting screen of the recording conditions in the other waveform recording device to which this invention is applied. It is a schematic diagram which shows the setting screen of the recording conditions in the further another waveform recording apparatus to which this invention is applied.

  Hereinafter, although the form for implementing this invention is demonstrated in detail, the scope of the present invention is not limited to these forms.

  An example of a waveform recording apparatus to which the present invention is applied is shown in FIG. The waveform recording apparatus 1 shown in FIG. 1 includes input connectors 11 and 12, an A / D conversion unit 2, a CPU (Central Processing Unit) 3, a waveform data recording unit 4, a recording condition recording unit 5, an operation memory 6, and a timer 7. , An operation unit 8 and a display unit 9 are provided.

  The input connectors 11 and 12 are connected to a measurement target phenomenon detector corresponding to a measurement target phenomenon such as a contact probe for voltage measurement, a current transformer for current measurement, a thermocouple for temperature measurement, a pressure sensor, etc. It is a connector to do. The input connector 11 corresponds to the measurement channel 1 (CH1), and the input connector 12 corresponds to the measurement channel 2 (CH2). The input connectors 11 and 12 are connected to the A / D converter 2 directly or via an amplifier or a filter (both not shown) as necessary. Note that the number of measurement channels is arbitrary, and the number may be appropriately increased as in CH1 to CH16, or only CH1.

  The A / D conversion unit 2 performs analog / digital conversion on input signals input from the input connectors 11 and 12 at a predetermined sampling rate set by the CPU 3 and outputs the converted signals to the CPU 3. The CPU 3 serves both as a recording control unit and an arithmetic processing unit in the present invention, and comprehensively controls the operation of the waveform recording apparatus 1. The CPU 3 controls the recording of waveform data as a recording control unit, and performs arithmetic processing using the recorded waveform data as an arithmetic processing unit.

  The waveform data recording unit 4 controls the operation by the CPU 3 (recording control unit) and records the waveform data of the signal waveforms of CH1 and CH2 input from the A / D conversion unit 2 to the CPU 3. The waveform data recording unit 4 may be a semiconductor memory such as a flash ROM or a hard disk disposed inside the apparatus, or may be an external recording medium (and its writing apparatus) such as a USB memory or a CD-RW.

  The recording condition recording unit 5 includes an initial value of a trigger condition to be compared with the value of the waveform data, a recording end condition, and change information for changing the trigger condition in order to start recording of the waveform data. Various conditions for performing the above are stored. The operation of the recording condition recording unit 5 is controlled by the CPU 3 (recording control unit).

  The operation memory 6 is a memory necessary for the operation of the CPU 3, which includes a ROM that stores a program for the operation of the CPU 3, a RAM that is a work area for the operation of the CPU 3, and the like. The waveform data recording unit 4, the recording condition recording unit 5, and the operation storage unit 6 may be shared by the same storage unit (for example, a hard disk).

  The timer measures the passage of time and is controlled by the CPU 3 (recording control unit). When a start signal is output from the CPU 3, the timer immediately starts measuring the passage of time, and the recording time set in the CPU 3 in advance. When t has elapsed, a time measurement end signal is immediately output to the CPU 3. When the CPU 3 has a timer function, the CPU 3 may also serve as the timer 7.

  The operation unit 8 is, for example, a keyboard, a touch panel, etc., and is operated by a measurer, and is used for numerical input, device operation mode, setting item selection, and the like. The display unit 9 is, for example, a liquid crystal panel, and displays a waveform or various setting items for recording. The operation unit 8 and the display unit 9 correspond to a setting unit in the present invention.

  Next, the operation of the waveform recording apparatus 1 will be described.

  First, a recording condition setting operation for recording a waveform will be described.

  When the operation unit 8 is operated and the recording condition setting mode is selected, the CPU 3 displays a recording condition setting screen as shown in FIG. 2 on the display unit 3 as an example. This recording condition setting screen is a screen for setting specific conditions for recording waveform data a plurality of times.

  FIG. 2 shows an example in which a trigger for starting recording is performed by a level trigger. Note that the trigger may be selected from a level trigger, a window trigger, etc., and when the level trigger is selected, the recording condition setting screen of FIG. 2 may be displayed. In the level trigger, recording is started when the waveform data value (signal level) reaches a predetermined value. This predetermined numerical value is called a trigger level (an example of a trigger condition value).

  The measurer operates the operation unit 8 while looking at the display unit 9 to set various setting items displayed on the screen. In the “trigger CH” in the figure, it is set whether the signal waveform input from CH1 or CH2 is used for triggering. In the figure, an example in which CH1 is set as a trigger channel is shown. In the “trigger level initial value”, an initial value A (3V as an example) of the trigger level at which recording is started first is set. The “trigger level initial value” is an example of the initial value of the trigger condition in the present invention.

  The “trigger slope” sets whether to trigger only when the waveform rises (rises), triggers only when the waveform falls (falls), or triggers whether the waveform rises or falls. In the figure, as an example of triggering only when the waveform rises, an example in which a symbol “↑” is set in “trigger slope” is shown. Note that “↓” is set in the case of descending, and “↑ ↓” is set in the case of ascending and descending (both). The trigger conditions such as level trigger and window trigger, trigger channel, trigger level, and trigger slope are trigger conditions.

  In the “recording time”, a recording time t for continuing recording when the trigger condition is satisfied and recording of waveform data is started is set. Here, an example is shown in which recording is performed for 10 minutes every time. This recording time is an example of an end condition in the present invention.

  In the “trigger shift value”, a value for calculating a trigger level that is changed every time waveform data is recorded is set. Here, a predetermined shift value for shifting the trigger level is set by sequentially adding or subtracting the (previous) trigger level value at each recording. As an example, when adding, the numerical value is set with a “+” sign, and when subtracting, the numerical value is set with a “−” sign. When the waveform recording apparatus 1 performs only addition or subtraction, it is possible to set only the numerical value without adding a sign because it is known in advance whether addition or subtraction. The figure shows an example in which 2V is added to the previous trigger level each time recording is performed. The “trigger shift value” corresponds to an example of “change information for changing the trigger condition” and “shift value” in the present invention. “Recording count” sets the number of times waveform data is recorded. When the number of times is not specified and the number of times of recording is set, for example, a blank is set. The CPU 3 stores the set information in the recording condition recording unit 5. Although it is preferable that at least one of these setting items can be set, for items that may not change, a numerical value may be set in the program so that it cannot be set from the operation unit.

  Next, the waveform data recording operation will be described with reference to FIGS.

  In order to perform waveform recording, the measurer connects a sensor or the like that outputs a trigger signal waveform to CH1 (input connector 11) in FIG. 1 and another signal waveform to CH2 (input connector 12). Connect the sensor to output.

  When the measurer operates the operation unit 3 to start the operation in the waveform recording mode, the CPU 3 operates according to the program stored in the operation memory 6 as shown in the flowchart of FIG. First, the CPU 3 (recording control unit) reads the recording conditions preset in FIG. 2 from the recording information recording unit 5 in step S1. Subsequently, in step S2, the CPU 3 starts the operation of the A / D conversion unit 2, and sequentially starts to read the analog / digital converted waveform data of CH1 and CH2. FIG. 4 shows an example of waveform data input from CH1 and CH2.

  Subsequently, in step S3, the CPU 3 monitors whether the value of the waveform data of CH1 satisfies the trigger condition. Specifically, the CPU 3 compares the value of the waveform data of CH1 with the initial value A of the trigger level, and whether the value of the waveform data of CH1 has increased (increased) and has reached the initial value A of the trigger level. Whether or not is monitored (step S3). When the value of the waveform data of CH1 does not reach the initial value A of the trigger level, the CPU 3 repeats step S3 and continues monitoring. In the period S1 shown in FIG. 4, since the value of the waveform data of CH1 has not reached the initial value A of the trigger level, the CPU 3 is in a state of continuing the monitoring in step S3. In this state, waveform data is not recorded.

  When the value of the waveform data of CH1 rises and reaches the initial value A at point P1 in FIG. 4, the CPU 3 immediately starts recording the waveform data of CH1 into the waveform data recording unit 4 and at the same time this recording In synchronization with the start of recording, recording of the waveform data of CH2 into the waveform data recording unit 4 is started (step S4). The waveform data of CH2 corresponds to other waveform data in the present invention. At this time, the CPU 3 preferably records the waveform data and the trigger level A in association with each other so that the waveform data of CH1 and CH2 is recorded at the trigger level A. It is also preferable to record the number of times of recording (here, the first time) in association with the waveform data. At the same time as the start of the recording, the CPU 3 causes the timer 7 having the recording time t set in advance to start measuring time (step S5). A buffer memory (not shown) that always records the waveform data of CH1 and CH2 is provided, and when waveform data is recorded, the waveform data to be recorded from the buffer memory to the waveform data recording unit 4 is stored. You may make it forward.

  After starting the recording of the waveform data, the CPU 3 monitors whether or not an end signal indicating that the recording time t (for example, 10 minutes) has elapsed is output from the timer 7 (step S6). When the recording end signal is output from the timer 7, the CPU 3 immediately ends the recording of the waveform data of CH1 and CH2 in the waveform data recording unit 4 (step S7). This completes the first recording, that is, the recording of the waveform data of CH1 and CH2 in the period R1 shown in FIG.

  Subsequently, the CPU 3 determines whether or not recording is performed at all trigger levels to be recorded (step S8). In this case, the number of times of recording set in FIG. 2 is 3, and since the first recording has been completed, the CPU 3 proceeds to step S9 and changes the trigger level. In step S9, the CPU 3 calculates the next trigger level B by adding the trigger shift value to the initial value A of the trigger level. In this example, since the initial value A is 3V and the trigger shift value is 2V, the trigger level B becomes 5V by adding both values. Note that the trigger level change (step S9) may be calculated in advance during step S8 after the trigger condition is satisfied in step S3.

  Next, the CPU 3 returns to step S2 and monitors whether or not the waveform data of CH1 reaches the trigger level B. In the period S2 shown in FIG. 4, since the value of the waveform data of CH1 does not reach the trigger level B, the waveform data is not recorded. Since the value of the waveform data of CH1 reaches the trigger level B at the point P2 shown in FIG. 4, the CPU 3 proceeds to step S4 to start recording the waveform data of CH1 and CH2 in the waveform data recording unit 4 and at step S5. Then, the timer 7 starts time measurement. At this time, the waveform data is recorded in association with the trigger level B separately from the first waveform data so as not to overwrite the first recorded waveform data. Moreover, it is preferable to record so that it may be understood that it is the second recording. When the recording time t has elapsed (step S6), the CPU 3 ends the waveform data recording (step S7). Thereby, the second recording, that is, the recording of the waveform data of CH1 and CH2 in the period R2 shown in FIG. 4 is completed.

  Next, the CPU 3 proceeds from step S8 to S9 and changes the trigger condition. In this case, the CPU 3 calculates the trigger level C (7 V) by adding the trigger shift value (2 V) to the trigger level B (5 V).

  Subsequently, the CPU 3 returns to step S3 and executes steps S3 to S7 in the same manner as described above. As a result, the CPU 3 does not record the waveform data of the period S3 in FIG. 4, and records the waveform data of the period R3 from when the waveform data of CH1 exceeds the trigger level C at the point P3 until the recording time t elapses. . At this time, the waveform data is recorded in association with the trigger level C separately from the first and second waveform data so as not to overwrite the first and second waveform data. Moreover, it is preferable to record so that it may be understood that it is the third recording. This completes the third recording. As described above, the CPU 3 (recording control unit) selectively records the waveform data by sequentially changing the trigger condition value from the initial value based on the change information recorded in the recording condition recording unit 5 in advance. Run.

  Subsequently, since the number of times of recording (three times) set in FIG. 2 has already been completed, the CPU 3 determines that recording has been completed for all trigger levels to be recorded in step S8, and proceeds to step S10. . In step S10, the CPU 3 (arithmetic processing unit) executes arithmetic processing on each CH1 waveform data and / or each CH2 waveform data recorded from the first time to the third time. Note that the CPU 3 may execute step S10 between steps S7 and S8 and perform arithmetic processing on the waveform data and / or other waveform data each time recording is performed under each trigger condition.

  As an example, when the waveform of CH1 shown in FIG. 4 is waveform data of the flow rate of water increased stepwise at a constant time t and the waveform of CH2 is waveform data of the water pressure, the CPU 3 The waveform (water pressure) data of each CH2 recorded in the second and third times is calculated, and the maximum value, the minimum value, and the average value (arithmetic mean, geometric mean, harmonic mean) of the water pressure at each time Each standard deviation is obtained and displayed on the display unit 9 in correspondence with the trigger level. In this example, the CPU 3 performs an arithmetic process on the waveform data of CH2 under each trigger condition. The calculation formula for performing the arithmetic processing is included in advance in the program for the operation memory in correspondence with the calculation item such as the maximum value to be obtained. Calculation items may be selected by operating the operation unit 8.

  Further, as an example, when the waveform of CH1 shown in FIG. 4 is waveform data of the flow rate of water that is increased stepwise at a certain time t, and the waveform of CH2 is waveform data of the water temperature, the CPU 3 Calculate the total water flow from the first flow rate data, calculate the temperature rise from the first water temperature data, multiply the total water amount by the temperature rise, calculate the total number of calories, and correspond to the trigger level To be displayed on the display unit 9. The second time and the third time are similarly calculated and displayed. In this example, the CPU 3 performs arithmetic processing on the waveform data of CH1 and CH2 under each trigger condition. In addition, when calculating only the total water amount at each time from the waveform data of CH1, the CPU 3 is an example in which calculation processing is performed on the waveform data of CH1 under each trigger condition.

  This completes the recording of the waveform data of CH1 and CH2 and the arithmetic processing for the waveform data. The measurer displays the recorded waveform data and calculation results on the display unit 9 or outputs them externally via an external recording medium or an external output interface (not shown).

  In addition, although the example in which the shift value is set as “+ 2V” and the trigger level is changed by increasing the shift value is shown, for example, when the shift value is set as “−2V”, in step S9, The trigger level is subtracted by 2V. In this case, when the initial value A of the trigger level is set to 3V, the trigger level B is 1V and the trigger level C is -1V.

  In addition, as shown in FIG. 2, a predetermined shift for shifting the value of the trigger level by sequentially adding or subtracting the value of the trigger condition (trigger level) as change information for changing the trigger condition Although an example in which the value is set and the trigger level is calculated is shown, the trigger condition (trigger level) value is associated with the recording order (number of times of recording) as shown in the recording condition setting screen of FIG. The value itself may be set. Further, as shown in FIG. 5, the recording time may be set numerically in association with the recording order. This figure shows an example of a recording condition setting screen in which recording conditions for each time can be individually set when recording waveform data a plurality of times (for example, four times).

  In this case, when the operation unit 8 is operated and the recording condition setting mode for individual setting is selected, the CPU 3 causes the display unit 9 to display a screen (not shown) that prompts the user to input the number of times of recording. A table shown in FIG. 5 having columns for setting the number of times of recording is displayed on the display unit 9. The measurer operates the operation unit 8 to set the trigger level value (eg, 3V, 5V, 8V, 10V), trigger slope (eg, “↑”), and recording time (10 minutes, 10V) for each recording order. 8 minutes, 5 minutes, 3 minutes). The “trigger CH” is the same as the example in FIG. The CPU 3 stores the set condition in the recording condition recording unit 5. In the recording operation mode, the CPU 3 reads these conditions in step S1 of the flowchart of FIG. 3, and uses recording conditions (trigger conditions) corresponding to the recording order in steps S3 to S9. As described above, the recording conditions can be individually set in association with the recording order, so that the range of waveform data to be recorded can be set more finely and recorded.

  Moreover, although the example which sets a recording condition by a level trigger was demonstrated, you may set by a window trigger. In the window trigger, recording is started when the value (signal level) of the waveform data enters or falls out of the range set by the upper limit value and the lower limit value. The upper limit value and the lower limit value are an example of the value of the trigger condition in the present invention.

  FIG. 6 shows an example of a recording condition setting screen in the case of the window trigger. The CPU 3 displays the screen of FIG. 6 on the display unit 9 when the operation unit 8 is operated and the window trigger recording condition setting mode is selected. In the “upper limit initial value” in the figure, an initial value A1 (4 V as an example) of the upper limit value of the window trigger that starts recording is set first. In the “lower limit initial value”, an initial value A2 (3V as an example) of the lower limit value of the window trigger that starts recording first is set. This upper limit initial value A1 and lower limit initial value A2 correspond to the initial value of the trigger condition in the present invention. In “Trigger range”, set “IN” to start recording when the waveform data value falls within the range set by the upper limit and lower limit, and start recording when the waveform data goes out of the range. In this case, “OUT” is set. “Trigger CH”, “Trigger shift value”, “Recording time”, and “Recording count” are the same as those shown in FIG. The CPU 3 stores these recording conditions in the recording condition recording unit 5.

  Here, an example in which the “trigger range” is set to IN will be described. In the recording operation mode, the CPU 3 reads the above recording conditions in step S1 of the flowchart of FIG. In step S3, the CPU 3 compares the upper limit initial value A1 and the lower limit initial value A2 with the value of the waveform data, and the waveform data value ranges from the upper limit initial value A1 to the lower limit initial value A2. It is monitored whether it has entered the range, and when it falls within the range, recording of waveform data of CH1 and CH2 is started (step S4) and time measurement is started by the timer 7 (step S5). When the recording time t has elapsed (step S6), the CPU 3 ends the recording of the waveform data (step S7), and changes the trigger condition in step S9. In step S9, the CPU 3 calculates the upper limit value B1 (eg, 6V) by adding the trigger shift value (eg, 2V) to the upper limit value initial value A1 (eg, 4V). Further, the CPU 3 calculates a lower limit value B2 (for example, 5V) by adding a trigger shift value (for example, 2V) to the lower limit value initial value A2 (for example, 3V). Subsequently, in step S3, the CPU 3 monitors whether or not the value of the waveform data falls within the range from the upper limit value B1 to the lower limit value B2, and when it falls within the range, the step is performed as described above. Waveform data is recorded by performing S4 to S8. Next, in step S9, the CPU 3 calculates the upper limit value C1 (for example, 8V) by adding the trigger shift value (for example, 2V) to the upper limit value B1 (for example, 6V). Further, the CPU 3 calculates a lower limit value C2 (7V) by adding a trigger shift value (for example, 2V) to the lower limit value B2 (for example, 5V). Subsequently, in step S3, the CPU 3 monitors whether or not the value of the waveform data is within the range from the upper limit value C1 to the lower limit value C2, and performs steps S4 to S10 as described above. Thus, the present invention can also be applied to window triggers.

  Further, the example in which the recording time t is set as the end condition for ending the recording has been described. However, as the end condition, the value of the waveform data for ending the recording or the relative value with respect to the value of the trigger condition may be set. Good. For example, when setting the value of the waveform data for ending the recording, numerical values are set such that the first end value is 3.5V, the second end value is 5.6V, and so on. The CPU 3 ends the recording when the value of the waveform data reaches this end value. Also, for example, when setting a relative value with respect to the value of the trigger condition, the value is set to +0.5 V, and the waveform data value reaches +0.5 V with respect to the trigger level value at which recording is started. You may make it complete | finish recording. This relative value may be set in the range of the upper limit value and the lower limit value, such as ± 0.5V.

  Moreover, although the example of setting the value of the trigger condition and the trigger shift value with the voltage value (V) has been shown, the measurement target phenomenon such as the current value (A) or the water flow rate value (L / min) is shown. It may be set in units.

  1 is a waveform recording apparatus, 2 is an A / D conversion unit, 3 is a CPU, 4 is a waveform data recording unit, 5 is a recording condition recording unit, 6 is an operation memory, 7 is a timer, 8 is an operation unit, and 9 is a display. , 11 and 12 are input connectors, A is an initial trigger level, B and C are trigger levels, CH1 is a measurement channel 1, CH2 is a measurement channel 2, S1 to S3 are non-recording periods, and R1 to R3 are The recording period, t is the recording time.

Claims (5)

A waveform data recording unit for recording waveform data whose level increases or decreases in a stepped manner at regular intervals ;
In the waveform data recording unit, an initial value of a trigger condition for starting recording of the waveform data and a recording end condition are recorded so that a range within the waveform data can be recorded. Recording for previously storing change information, which is a predetermined shift value for shifting the value of the trigger condition by sequentially adding to or subtracting from the value of the trigger condition, and the predetermined time as the time for continuing the operation A condition recording section;
Corresponding to the trigger condition and the end condition, the start and end of recording of the waveform data in the waveform data recording unit are sequentially changed from the initial value based on the change information. A waveform recording apparatus comprising: a recording control unit to be executed. The waveform recording apparatus according to claim 1, further comprising a setting unit configured to set at least one of an initial value of the trigger condition, the end condition, and the change information . The trigger condition, level triggering, or waveform recording apparatus according to claim 1 or claim 2, characterized in that it is defined by the window trigger. Any said recording control unit, the waveform data recording unit, said start and in conjunction with the end of the waveform data recording, claim 1, characterized in that to record the other waveform data with the waveform data 3 The waveform recording device according to claim 1. 5. The waveform recording apparatus according to claim 4 , further comprising an arithmetic processing unit that performs arithmetic processing on each of the waveform data recorded in the waveform data recording unit and / or each of the other waveform data. .

Images