JP2009264773A - Recording apparatus and measuring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To predict the occurrence of buffer overrun in an acquisition memory in advance. <P>SOLUTION: The recording apparatus records digital data obtained by digitally converting an externally input analog signal in a predetermined recording medium through a write action and a read operation to/from the acquisition memory. The recording apparatus includes an arithmetic processing means for calculating, on the basis of the write address and read address of the digital data for the acquisition memory, a recording margin indicating the follow-up condition of the read operation with respect to the write action of the digital data, and a display means for displaying the recoding margin calculated by the arithmetic processing means. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

 The present invention relates to a recording apparatus and a measurement system that capture and quantize analog signals such as voltage and temperature at high speed and store the digital data in a recording medium such as a hard disk in real time.

  FIG. 7 is a configuration block diagram of a conventional recording apparatus 10. As shown in FIG. 7, the conventional recording apparatus 10 includes a measurement unit 11, an acquisition memory 12, a recording data management unit 13, a recording unit 14, a memory overwrite detection unit 15, and a display unit 16.

  The measuring unit 11 measures an analog signal such as voltage or temperature input from the outside, A / D converts the analog signal input from the outside at a preset sample rate, and is quantized digitally. Data (hereinafter abbreviated as data) and the write address of the digital data are output to the acquisition memory 12. The write address is also output to the memory overwrite detection unit 15.

 The acquisition memory 12 stores data in a memory area specified by a write address input from the measurement unit 11 in real time, while being stored in a memory area specified by a read address input from the recording data management unit 13. The recorded data is output to the recording data management unit 13.

  The recording data management unit 13 manages reading of data stored in the acquisition memory 12 (output of read address), read timing, read amount, and read address. The recording data management unit 13 outputs the data read from the acquisition memory 12 to the recording unit 14. The read address is also output to the memory overwrite detection unit 15. The recording unit 14 stores the data read by the recording data management unit 13 in a recording medium such as a hard disk in real time.

  The memory overwrite detection unit 15 detects overwriting of data in the acquisition memory 12 based on the write address input from the measurement unit 11 and the read address input from the recording data management unit 13. Here, overwriting data means that, when the sample rate for measuring an analog signal is high, the reading speed is slower than the writing speed to the acquisition memory 12, so that the incomplete read data is overwritten by the write data. Such a phenomenon is generally called a buffer overrun.

  For example, FIG. 8A shows a state in which the read operation normally follows the write operation to the acquisition memory 12 and the recording process is in time without a buffer overrun. The write operation and the read operation to the acquisition memory 12 are repeated in a loop between the start address and the final address in the acquisition memory 12 as indicated by arrows in the drawing. FIG. 8B shows a state where the read operation cannot follow the write operation to the acquisition memory 12 and a buffer overrun occurs.

 When the memory overwriting detection unit 15 detects the occurrence of the buffer overrun as described above, the memory overwriting detection unit 15 outputs a measurement interruption signal for instructing the measurement unit 11 to stop the measurement and notifies the occurrence of the buffer overrun. A buffer overrun notification signal is output to the display unit 16. The display unit 16 displays the data recorded in the recording unit 14 in a waveform, and displays various setting information, data recording status, and the like. Further, when the buffer overrun notification signal is input from the memory overwrite detection unit 15, the display unit 16 displays a message for notifying the user of the occurrence of the buffer overrun.

 FIG. 9 is a flowchart showing the recording operation of the conventional recording apparatus 10 configured as described above. As shown in FIG. 9, first, the measurement unit 11 performs A / D conversion on an analog signal input from the outside at a predetermined sample rate (step S10), and outputs the data and the write address to the acquisition memory 12. The data is written into the acquisition memory 12 (step S11). At this time, the write address acquired by the memory overwrite detection unit 15 is also updated.

 Then, the recording data management unit 13 outputs the read address to the acquisition memory 12, thereby reading the data from the acquisition memory 12 and outputting the data to the recording unit 14 (step S12). At this time, the read address acquired by the memory overwrite detection unit 15 is also updated. And the recording part 14 preserve | saves the data read by the recording data management part 13 on a hard disk etc. (step S13). Here, the display unit 16 displays the measured data in a waveform as shown in FIG. 10A by an asynchronous operation not described in the flowchart of FIG. As shown in FIG. 10A, an indicator indicating that data is being recorded flashes on the display screen.

 The memory overwrite detection unit 15 determines whether or not a buffer overrun has occurred in the acquisition memory 12 based on the write address and the read address (step S14), and determines that no buffer overrun has occurred (No), the measurement interruption signal and the buffer overrun notification signal are not output. That is, in this case, the process returns to step S10, and signal measurement (A / D conversion), acquisition, and recording processes are repeated continuously.

 On the other hand, if it is determined in step S14 that the buffer overrun has occurred (Yes), that is, the sample rate to be measured is increased, the write address catches up with the read address, and data overwrite occurs. In this case, by outputting a measurement interruption signal to the measurement unit 11, the measurement unit 11 is instructed to interrupt measurement so that no further updating (writing) to the acquisition memory 12 is performed (step S15). At this time, a buffer overrun notification signal is output from the memory overwrite detection unit 15 to the display unit 16.

When the buffer overrun notification signal is input, the display unit 16 displays a message dialog for notifying the occurrence of the buffer overrun on the display screen as shown in FIG. 10B (step S16). At this time, since data for about one round is left on the acquisition memory 12, the recording data management unit 13 reads out the remaining data and outputs it to the recording unit 14. After continuing the recording process, the recording process is terminated (step S17).
Shigeru Takezawa and three others, "High-speed long memory digital oscilloscope" Signal Explorer DL7100 "", Yokogawa Technical Journal, Yokogawa Electric Corporation, 2000, Vol. 44, No. 1, p.15-18

  In the conventional recording apparatus 10 as described above, when the sample rate measured for the recording process is sufficiently low, continuous data recording is possible. However, the sample rate to be measured is increased or the measurement is performed. When the number of input signal channels increases and the amount of data increases, or when the recording process is not in time due to the CPU load of the recording apparatus itself, a buffer overrun occurs. For this reason, the user recognizes that continuous recording cannot be performed for the first time after the occurrence of buffer overrun. Therefore, when buffer overrun occurs after a long time has elapsed, a large time and cost are required. Loss will occur.

 In the above prior art, the all-in-one recording device 10 has been exemplified. However, the PC and the measuring instrument are connected by a communication cable or the like, the data acquired by the measuring instrument is transmitted to the PC, and the PC side stores the data on the hard disk. In the case of a measurement system that records data and displays on a monitor, even if the sample rate is sufficient for recording processing, the performance may deteriorate in the communication line condition and a buffer overrun may occur. At this time, the user cannot predict the occurrence of the buffer overrun until the message dialog notifying the occurrence of the buffer overrun is displayed on the display screen of the PC, resulting in a very unreliable system. .

  The present invention has been made in view of the above-described circumstances, and can predict the occurrence of a buffer overrun in the acquisition memory in advance, thereby preventing the occurrence of time and cost loss and improving the reliability. An object of the present invention is to provide a recording apparatus and a measurement system capable of achieving the above.

  In order to solve the above-described problems, in the present invention, as a first solving means related to a recording apparatus, digital data obtained by digitally converting an externally input analog signal is subjected to a write operation and a read operation to an acquisition memory. A recording margin that indicates a follow-up state of the reading operation with respect to the writing operation of the digital data based on the writing address and the reading address of the digital data with respect to the acquisition memory. Computation processing means for computing, and display means for displaying the recording margin calculated by the computation processing means are provided.

  Further, as a second solving means related to the recording apparatus, in the first solving means, the arithmetic processing means reads out the acquisition data in the acquisition memory based on a write address and a read address of the digital data with respect to the acquisition memory. Address monitoring means for calculating the remaining recorded data amount indicating an incomplete data amount, effective memory amount storage means for storing a preset effective memory amount of the acquisition memory, and the remaining amount for the effective memory amount Recording margin calculation means for calculating a recording data amount ratio as the recording margin.

 Further, as a third solving means relating to the recording apparatus, in the first or second solving means, the display means is configured so that writing control on the recording medium is prioritized according to the recording margin. It is characterized by reducing the load of the image display processing.

 Further, as a fourth solving means according to the recording apparatus, in the second or third solving means, the address monitoring means uses write data in the acquisition memory based on a write address and a read address of the digital data. It is determined whether or not overwriting of unread data has occurred. If the overwriting has occurred, the display means notifies the display means, and the display means indicates that the overwriting has occurred from the address monitoring means. When the notification is received, the fact that overwriting has occurred in the acquisition memory is displayed.

  Further, as a fifth solving means relating to the recording apparatus, in any of the first to fourth solving means, an analog signal inputted externally is converted into a digital signal, and a write address of digital data obtained by the digital conversion is converted. Data writing means for generating a write operation to the acquisition memory, data reading means for generating the read address and performing a read operation on the acquisition memory, and digital data read by the data reading means are predetermined. Recording means for recording on the recording medium.

 Furthermore, in the present invention, as a solving means related to the measurement system, a measurement memory including an acquisition memory and a data writing means for performing a write operation to the acquisition memory of digital data obtained by digitally converting an externally input analog signal. A data reading means for performing a reading operation with respect to the acquisition memory of the measuring apparatus, and a recording for recording the digital data read by the data reading means on a predetermined recording medium. A measuring system comprising: an information processing device comprising: a reading means for reading out the digital data based on a writing address and a reading address of the digital data with respect to the acquisition memory. Computation processing means for computing a recording margin indicating the tracking state of the operation and transmitting the computation result to the information processing device is provided, and the information processing device displays the recording margin transmitted from the measuring device. A display means is provided.

 In the present invention, based on the write address and the read address of the digital data with respect to the acquisition memory, the recording margin indicating the follow-up state of the reading operation with respect to the digital data writing operation is calculated, and this recording margin is displayed by the display means. . The occurrence of buffer overrun in the acquisition memory (that is, overwriting of unread data with write data) can be predicted from the follow-up state of the read operation with respect to the write operation. For example, immediately before the occurrence of buffer overrun, the read operation cannot follow the write operation, and the write operation catches up with the read operation. That is, by displaying the recording margin indicating the read operation follow-up state with respect to the write operation, the user can know the read operation follow-up state with respect to the write operation in real time and can predict the occurrence of a buffer overrun. It becomes like this. Therefore, according to the present invention, it is possible to predict the occurrence of buffer overrun in the acquisition memory in advance, and it is possible to improve the reliability by preventing the occurrence of time and cost loss.

Hereinafter, an embodiment of a recording apparatus and a measurement system according to the present invention will be described with reference to the drawings.
[Recording device]
FIG. 1 is a configuration block diagram of a recording apparatus 20 according to the present embodiment. In FIG. 1, the same components as those in FIG. As shown in FIG. 1, a recording apparatus 20 according to the present embodiment includes a measurement unit (data writing unit) 11, an acquisition memory 12, a recording data management unit (data reading unit) 13, a recording unit (recording unit) 14, and a memory. An overwriting detection unit (address monitoring unit) 15a, a display unit (display unit) 16a, an effective memory amount storage memory (effective memory amount storage unit) 20, and a recording margin calculation unit (recording margin calculation unit) 21 are provided.

 As shown in FIG. 1, the recording apparatus 20 according to the present embodiment differs from the conventional recording apparatus 10 in that a memory overwrite detection unit 15 (reference numeral 15a in the present embodiment) and a display section 16 (reference numeral in the present embodiment). A new function is added to 16a), and an effective memory amount storage memory 20 and a recording margin calculation unit 21 are newly provided. The memory overwrite detection unit 15a, the effective memory amount storage memory 20, and the recording margin calculation unit 21 constitute the arithmetic processing means in the present invention.

  The memory overwrite detection unit 15a overwrites the data in the acquisition memory 12 (buffer overrun) based on the write address input from the measurement unit 11 and the read address input from the recording data management unit 13 as in the past. In addition to the function of detecting the occurrence of the recording data), the remaining recording data amount d in the acquisition memory 12 is calculated based on the writing address and the reading address, and the calculation result is output to the recording margin calculation unit 21. ing. Here, the remaining recording data amount d indicates an unread data amount stored between the write address and the read address of the acquisition memory 12, as shown in FIG.

  The effective memory amount storage memory 20 stores a preset effective memory amount of the acquisition memory 12. Here, the effective memory amount refers to the amount of memory that can be used to store the data sampled by the measurement unit 11 in the acquisition memory 12, and is determined according to measurement conditions such as the number of input channels. Is. In the present embodiment, a half memory amount is determined as the effective memory amount with respect to the entire memory amount (= M) of the acquisition memory 12, and this effective memory amount (= M / 2) is determined as the effective memory amount storage memory. 20 is stored.

 The recording margin calculation unit 21 receives the remaining recording data amount d calculated by the memory overwrite detection unit 15 a as input, and the remaining recording with respect to the effective memory amount (= M / 2) stored in the effective memory amount storage memory 20. The ratio of the data amount d is calculated as a recording margin D indicating the follow-up state of the read operation with respect to the data write operation to the acquisition memory 12, and the calculation result is output to the display unit 16a. The display unit 16a has a function to display the measured data as a waveform, display various setting information, data recording status, etc., and a message dialog for notifying the occurrence of buffer overrun, as in the past. In addition, the recording margin calculation unit 21 has a function of displaying the recording margin D calculated.

 Subsequently, a recording operation of the recording apparatus 20 according to the present embodiment configured as described above will be described. FIG. 3 is a flowchart showing the recording operation of the recording apparatus 20 according to the present embodiment. As shown in FIG. 3, the measurement unit 11 first performs A / D conversion on an externally input analog signal at a predetermined sample rate (step S20), and outputs the data and write address to the acquisition memory 12. The data is written into the acquisition memory 12 (step S21). At this time, the write address acquired by the memory overwrite detection unit 15a is also updated.

 Then, the recording data management unit 13 outputs the read address to the acquisition memory 12, thereby reading the data from the acquisition memory 12 and outputting the data to the recording unit 14 (step S22). At this time, the read address acquired by the memory overwrite detection unit 15a is also updated. Then, the recording unit 14 stores the data read by the recording data management unit 13 in a hard disk or the like (step S23).

 Here, the memory overwrite detection unit 15a determines whether or not a buffer overrun has occurred in the acquisition memory 12 based on the write address and the read address (step S24), and if the buffer overrun has not occurred. When the determination is made (No), the measurement interruption signal and the buffer overrun notification signal are not output, the remaining recording data amount d of the acquisition memory 12 is calculated based on the writing address and the reading address, and the calculation result is recorded as the recording margin. It outputs to the calculation part 21 (step S25).

Then, the recording margin calculation unit 21 reads the effective memory amount (= M / 2) from the effective memory amount storage memory 20, and the effective memory amount and the remaining recorded data amount d calculated by the memory overwrite detection unit 15a. Then, the recording margin is calculated and the calculation result is output to the display unit 16a (step S26). The recording margin D is calculated by the following calculation formula (1).
D = 100 × d / (M / 2) (1)

 For example, as shown in FIG. 4A, in the state where the read operation normally follows the data write operation to the acquisition memory 12 and the recording process is sufficiently in time, the remaining recorded data with respect to the effective memory amount. The ratio of the amount d, that is, the recording margin D is calculated to be 2%. In addition, as shown in FIG. 4B, in the state where the read operation is delayed (becomes unable to follow) with respect to the data write operation to the acquisition memory 12, and the recording processing margin is becoming insufficient, the recording margin D Is calculated as 80%.

The display unit 16a displays the measured data as a waveform by an asynchronous operation not described in the flowchart of FIG. 3 and also displays an indicator indicating the recording margin D input from the recording margin calculation unit 21. (Step S27). FIG. 5A is an example of a screen display in the state of FIG. 4A, in which an indicator indicating that recording is blinking and an indicator (bar graph) indicating a recording margin D = 2% are displayed. Has been. FIG. 5B is a screen display example in the state of FIG. 4B, in which an indicator indicating that recording is blinking and an indicator indicating the recording margin D = 80% are displayed. Yes.
Usually, when the recording process is sufficiently in time for the sample rate to be measured (when the reading operation follows the writing operation with a margin), the recording margin as shown in FIG. May be temporarily displayed depending on the processing load of the recording apparatus 20 or the like, but the display returns to the display as shown in FIG. 5A again by returning to the stable state. .

 In this case, the process returns to step S20, and signal measurement (A / D conversion), acquisition, and recording processes are continuously repeated. On the other hand, if it is determined in step S24 that the buffer overrun has occurred (Yes), that is, the sample rate to be measured becomes high, the write address catches up with the read address, and data overwrite occurs. In this case, by outputting a measurement interruption signal to the measurement unit 11, the measurement unit 11 is instructed to interrupt measurement so that no further updating (writing) to the acquisition memory 12 is performed (step S28). At this time, a buffer overrun notification signal is output from the memory overwrite detection unit 15a to the display unit 16a.

 When the buffer overrun notification signal is input, the display unit 16a displays a message dialog for notifying the occurrence of the buffer overrun on the display screen (step S29). At this time, since data for about one round is left on the acquisition memory 12, the recording data management unit 13 reads out the remaining data and outputs it to the recording unit 14. After continuing the recording process, the recording process is terminated (step S30).

 As described above, according to the recording apparatus 20 according to the present embodiment, by displaying the recording margin D indicating the follow-up state of the read operation with respect to the data write operation to the acquisition memory 12, the user can perform the write operation in real time. As a result, the occurrence of buffer overrun can be predicted in advance, and the occurrence of loss in terms of time and cost can be prevented to improve reliability. It becomes possible.

 The operation of the recording apparatus 20 described above is realized by a multi-task process performed by a CPU (Central Processing Unit) according to a program. That is, the recording data management unit 13, the memory overwrite detection unit 15a, the recording margin calculation unit 21, the recording unit 14 (data writing control to the recording medium), and the display unit 16a (image display processing such as generation of image data) It operates on the CPU.

 Here, the image display processing in the display unit 16a and the writing control on the recording medium in the recording unit 14 place a heavy load on the CPU. Therefore, the occurrence of buffer overrun is prevented by providing the display unit 16a with a function for reducing the load of image display processing so that writing control on the recording medium in the recording unit 14 is given priority according to the recording margin D. can do. Specifically, as an example of a method for reducing the load of image display processing, (1) slowing the screen update cycle, (2) when displaying waveforms for a plurality of channels, the number of channels to be displayed is Generate reduced image data. (3) Generate image data by reducing the number of waveform data to be displayed. (4) Multiple windows (for example, the entire waveform in the upper window and the enlarged window in the lower window. When (waveform) is displayed, it is conceivable to generate image data by reducing the number of windows (for example, only the entire waveform).

[Measurement system]
Next, the measurement system according to the present embodiment will be described. FIG. 6 is a configuration block diagram of the measurement system according to the present embodiment. As shown in FIG. 6, the measurement system according to the present embodiment includes a measurement device 100 such as a digital oscilloscope, and a measurement device 100 connected to the measurement device 100 via a communication cable 300, such as a PC (Personal Computer). The information processing apparatus 200 is configured. The communication cable 300 is, for example, a USB (Universal Serial Bus) cable or an Ethernet (registered trademark) cable.
In FIG. 6, the measurement device 100 and the information processing device 200 perform control, data transmission / reception, and the like via a communication cable 300 through a communication control unit (not shown). It is shown in a form in which they are directly connected to each other.

  The measurement apparatus 100 includes a measurement unit 101, an acquisition memory 102, a memory overwrite detection unit 103, an effective memory amount storage memory 104, and a recording margin calculation unit 105, and the information processing apparatus 200 includes a recording data management unit 201. A recording unit 202 and a display unit 203 are provided. The measurement unit 101, the acquisition memory 102, the memory overwrite detection unit 103, the effective memory amount storage memory 104, and the recording margin calculation unit 105 in the measurement device 100 are the measurement unit 11, the acquisition memory 12, and the recording device 20 described in FIG. The memory overwrite detection unit 15 a, the effective memory amount storage memory 20, and the recording margin calculation unit 21 have the same functions. Further, the recording data management unit 201, the recording unit 202, and the display unit 203 in the information processing apparatus 200 have the same functions as the recording data management unit 13, the recording unit 14, and the display unit 16a in the recording device 20.

  That is, the recording data management unit 201 of the information processing apparatus 200 acquires data from the acquisition memory 102 by transmitting a read address to the measurement apparatus 100 (acquisition memory 102) via the communication cable 300. In addition, the memory overwrite detection unit 103 of the measurement device 100 is based on the write address input from the measurement unit 101 and the read address transmitted from the information processing device 200 (record data management unit 201). Detection of occurrence of buffer overrun and calculation of remaining recording data amount d are performed. The buffer overrun notification signal and the recording margin D calculated by the recording margin calculation unit 105 are transmitted to the display unit 203 of the information processing apparatus 200 via the communication cable 300.

 As described above, even in the measurement system including the measurement device 100 and the information processing device 200, the acquisition memory 102 provided on the measurement device 100 side can be obtained with the same configuration as the all-in-one recording device 20 illustrated in FIG. It is possible to display on the information processing apparatus 200 side the recording margin D indicating the follow-up state of the read operation with respect to the data write operation. In such a measurement system, since the recording processing performance on the information processing apparatus 200 side greatly depends on the CPU performance and communication line status of the information processing apparatus 200 itself, the effect of displaying the recording margin D is an all-in-one recording apparatus. Larger than 20.

 Note that the recording data management unit 201, the recording unit 202 (data writing control to the recording medium), and the display unit 203 (image display processing such as generation of image data) in the information processing apparatus 200 of the measurement system described above are operated by the CPU. To do. Therefore, similarly to the recording apparatus 20, by providing the display unit 203 with a function of reducing the load of image display processing so that writing control on the recording medium in the recording unit 202 is given priority according to the recording margin D. The occurrence of buffer overrun can be prevented.

1 is a configuration block diagram of a recording apparatus 20 according to an embodiment of the present invention. It is explanatory drawing regarding the remaining recording data amount d calculated in the memory overwrite detection part 15a of the recording device 20 which concerns on one Embodiment of this invention. 4 is a flowchart showing the operation of the recording apparatus 20 according to an embodiment of the present invention. FIG. 6 is a first supplemental explanatory diagram regarding the operation of the recording apparatus 20 according to an embodiment of the present invention. FIG. 10 is a second supplementary explanatory diagram regarding the operation of the recording apparatus 20 according to an embodiment of the present invention. 1 is a configuration block diagram of a measurement system according to an embodiment of the present invention. 1 is a configuration block diagram of a recording apparatus 10 in the related art. It is explanatory drawing regarding the data overwrite (buffer overrun) of the acquisition memory. 6 is a flowchart showing the operation of the recording apparatus 10 in the related art. It is a supplementary explanatory drawing regarding operation | movement of the conventional recording device.

Explanation of symbols

 DESCRIPTION OF SYMBOLS 10, 20 ... Recording device, 11 ... Measurement part, 12 ... Acquisition memory, 13 ... Recording data management part, 14 ... Recording part, 15, 15a ... Memory overwrite detection part, 16, 16a ... Display part, 20 ... Effective memory amount Storage memory, 21 ... recording margin detection unit, 100 ... measuring device, 200 ... information processing device

Claims (6)

A recording apparatus for recording digital data obtained by converting an analog signal inputted externally into a predetermined recording medium through a writing operation and a reading operation to an acquisition memory,
An arithmetic processing means for calculating a recording margin indicating a follow-up state of the reading operation with respect to the writing operation of the digital data based on the writing address and the reading address of the digital data with respect to the acquisition memory;
Display means for displaying the recording margin calculated by the arithmetic processing means;
A recording apparatus comprising: The arithmetic processing means includes:
Address monitoring means for calculating a remaining recorded data amount indicating an unread data amount in the acquisition memory based on a write address and a read address of the digital data with respect to the acquisition memory;
Effective memory amount storage means for storing an effective memory amount of the acquisition memory set in advance;
Recording margin calculation means for calculating a ratio of the remaining recording data amount to the effective memory amount as the recording margin;
The recording apparatus according to claim 1, further comprising:   The recording apparatus according to claim 1, wherein the display unit reduces a load of its own image display processing so that writing control on the recording medium is prioritized according to the recording margin. . The address monitoring means determines whether or not overwriting of unread data by writing data has occurred in the acquisition memory based on the writing address and reading address of the digital data, and if the overwriting has occurred, Notification to the display means,
4. The recording according to claim 2, wherein the display unit displays that the overwriting has occurred in the acquisition memory when receiving a notification that the overwriting has occurred from the address monitoring unit. 5. apparatus. A data writing means for digitally converting an externally input analog signal, generating a write address for digital data obtained by the digital conversion, and performing a write operation to the acquisition memory;
Data reading means for generating the read address and performing a read operation on the acquisition memory;
Recording means for recording the digital data read by the data reading means on a predetermined recording medium;
The recording apparatus according to claim 1, further comprising: A measurement device comprising an acquisition memory and data writing means for performing a write operation to the acquisition memory of digital data obtained by digitally converting an externally input analog signal; and being connected in communication with the measurement device; A measurement system comprising: a data reading unit that performs a reading operation on the acquisition memory of the measuring device; and an information processing device that includes a recording unit that records digital data read by the data reading unit on a predetermined recording medium. Because
The measuring device calculates a recording margin indicating a follow-up state of the reading operation with respect to the writing operation of the digital data based on a writing address and a reading address of the digital data with respect to the acquisition memory, and calculates the calculation result as the information processing Computation processing means for transmitting to the device,
The information processing apparatus includes a display unit that displays the recording margin transmitted from the measurement apparatus.

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