JP6353880B2 - Measuring apparatus and measuring method - Google Patents

Description

  The present invention relates to a measuring device and a measuring method for measuring a high-frequency signal output from a device under test, for example.

  Conventionally, a spectrum analyzer is known as a measuring instrument that displays a distribution of frequency components contained in a high-frequency signal to be measured and measures a signal under measurement (see, for example, Patent Document 1).

  The one described in Patent Document 1 has a configuration in which a memory for storing waveform data is divided and used, and each measurement data is stored for each block of the divided storage area.

  With this configuration, the device described in Patent Document 1 can read the measurement data stored in each block sequentially from the past and display it on the screen.

Japanese Patent Laid-Open No. 10-232251

  However, although the trigger input is not described in Patent Document 1, it is considered that the data after the trigger input is the measurement object when the spectrum display explanatory diagram is referred to. Therefore, in the thing of patent document 1, the subject that the data before the time of a trigger input cannot be measured occurred.

  On the other hand, some conventional measurement devices can capture data before the trigger input. However, with this type of measurement device, data capture is started from the top address of the waveform memory each time. The old data was overwritten. For this reason, the conventional one has a problem that data captured in the past cannot be displayed to the user.

  The present invention has been made in view of the circumstances as described above, and can measure data before the trigger input and can display data captured in the past to the user. And it aims at providing a measuring method.

  A measuring apparatus according to claim 1 of the present invention is a measuring apparatus (10) for measuring waveform data output from a device under test (1), and has a storage area (50) for storing the waveform data. Data memory means (11), storage area dividing means (31) for dividing the storage area into a plurality of ring buffer storage areas (51 to 53), and storing the waveform data in one of the storage areas Trigger input detection means (32) for detecting a trigger input indicating a timing to perform the first storage area until the trigger input is detected after the trigger input detection means starts detecting the trigger input On the condition that the input of the trigger is detected by the capture means (33) for repeating the capture of the waveform data at Pre-trigger data (61) indicating data input within a predetermined time before the trigger detection time when the trigger is detected, and post-trigger data (62, 63) indicating data input within a predetermined time after the trigger detection time, And data storage means (34) for storing the data in the one storage area.

  With this configuration, the measuring apparatus according to claim 1 of the present invention includes data storage means for storing pre-trigger data indicating data input within a predetermined time before the trigger detection time when the trigger is detected. Earlier data can be measured.

  Further, with this configuration, the measuring apparatus according to claim 1 of the present invention includes the storage area dividing means that divides the storage area for storing the waveform data into a plurality of ring buffer storage areas. The data captured in the past in the storage area can be displayed to the user.

  Therefore, the measuring apparatus according to claim 1 of the present invention can measure data before the trigger input and can display data captured in the past to the user.

  In the measuring apparatus according to claim 2 of the present invention, the trigger input detection means detects the input of the trigger for each of the storage areas in a predetermined order, and the capture means stores the data storage When the pre-trigger data and the post-trigger data are stored in the one storage area by the means, the repetition of capturing the waveform data in the next storage area based on the order of the one storage area is started. It has a configuration.

  With this configuration, when the pre-trigger data and the post-trigger data are stored in one storage area, the measurement apparatus according to claim 2 of the present invention can start repeating waveform data capture in the next storage area. Never miss a trigger.

  The measuring apparatus according to claim 3 of the present invention has a configuration further comprising data transfer means (35) for transferring the pre-trigger data and the post-trigger data stored by the data storage means.

  With this configuration, the measurement apparatus according to claim 3 of the present invention can transfer the pre-trigger data and post-trigger data stored by the data storage unit to a predetermined destination.

  A measuring method according to claim 4 of the present invention is a measuring method using a measuring device (10) for measuring waveform data output from a device under test (1), wherein the measuring device uses the waveform data A storage area dividing step (S11) comprising waveform data memory means (11) having a storage area (50) for storing, and dividing the storage area into a plurality of ring buffer-type storage areas (51 to 53); A trigger input detection step (S16) for detecting a trigger input indicating timing for storing the waveform data in one storage area, and detection of the trigger input after the trigger input detection is started in the trigger input detection step. A capture step (S15) for repeating the capture of the waveform data in the one storage area until an input is detected; and the trigger input detection Pre-trigger data indicating data input within a predetermined time before the trigger detection time when the trigger was detected and input within a predetermined time after the trigger detection time on condition that the trigger input is detected in step And a data storage step (S18) for storing the post-trigger data indicating the processed data in the one storage area.

  With this configuration, the measurement method according to claim 4 of the present invention includes a data storage step of storing pre-trigger data indicating data input within a predetermined time before the trigger detection time when the trigger is detected. Earlier data can be measured.

  Also, with this configuration, the measurement method according to claim 4 of the present invention includes a storage area dividing step in which the storage area for storing the waveform data is divided into a plurality of ring buffer storage areas. The data captured in the past in the storage area can be displayed to the user.

  Therefore, the measurement method according to claim 4 of the present invention can measure data before the trigger input and can display data captured in the past to the user.

  The present invention can provide a measuring apparatus and a measuring method that can measure data before the trigger input and can display data captured in the past to the user. It is.

It is a block block diagram in one Embodiment of the measuring apparatus which concerns on this invention. It is a figure which shows the example which divided | segmented the storage area of the memory part in one Embodiment of the measuring apparatus which concerns on this invention into three local ring buffer memories. It is a figure which shows the structural example of the storage area of the local ring buffer memory in one Embodiment of the measuring apparatus which concerns on this invention. It is a figure which shows the whole operation | movement of the local ring buffer memory in one Embodiment of the measuring apparatus which concerns on this invention. It is explanatory drawing about the function of the data transfer part in one Embodiment of the measuring apparatus which concerns on this invention. It is a flowchart in one Embodiment of the measuring apparatus which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, the configuration of an embodiment of the measuring apparatus according to the present invention will be described. An example in which the measurement apparatus according to the present invention is applied to a spectrum analyzer will be described.

  As shown in FIG. 1, the spectrum analyzer 10 in this embodiment captures (measures) an output signal of a device under measurement (hereinafter referred to as “DUT”) 1 and measures it. The DUT 1 is, for example, a transmission device that transmits a radio frequency signal.

  The spectrum analyzer 10 includes an RF unit 20, a memory unit 11, a memory control unit 30, a control unit 40, a display unit 12, an operation unit 13, and a control device 14. The spectrum analyzer 10 includes a microcomputer including a CPU, a ROM, a RAM, an input / output circuit to which various interfaces are connected, and the like. The spectrum analyzer 10 causes a microcomputer to function as each functional unit of the spectrum analyzer 10 by executing a control program stored in advance in a ROM. The spectrum analyzer 10 is an example of a measuring device.

  The RF unit 20 includes an ATT (attenuator) 21, a local oscillator 22, a mixer 23, a BPF (band pass filter) 24, and an ADC (analog / digital converter) 25, and is based on a radio frequency signal (hereinafter referred to as "RF signal"). The frequency is converted into a band frequency signal.

  The ATT 21 attenuates the RF signal input from the DUT 1 to a predetermined level and outputs it to the mixer 23.

  The local oscillator 22 generates a local oscillation signal having a predetermined frequency and outputs it to the mixer 23.

  The mixer 23 mixes the RF signal output from the ATT 21 and the local oscillation signal output from the local oscillator 22, converts the frequency to a baseband frequency signal, and outputs the signal to the BPF 24.

  The BPF 24 filters the input signal, extracts a signal in a predetermined frequency region, and outputs it to the ADC 25.

  The ADC 25 converts the output signal of the BPF 24 from an analog value to a digital value and outputs it to the memory unit 11.

  The memory unit 11 has a storage area for storing waveform data of the output signal of the RF unit 20, and operates according to the control of the memory control unit 30. The memory unit 11 is an example of waveform data memory means.

  The memory control unit 30 includes a memory division unit 31, a trigger input detection unit 32, a capture unit 33, a data storage unit 34, and a data transfer unit 35, and controls the memory unit 11.

  The memory dividing unit 31 divides the storage area of the memory unit 11 into a plurality of ring buffer type storage areas. The memory dividing unit 31 is an example of a storage area dividing unit.

  For example, the memory dividing unit 31 sets the capture time in each storage area to T (seconds), the capacity of the memory unit 11 to M (bytes), the data bit width of the ADC 25 to D (bits), and the sampling rate of the ADC 25 to S (Hz) ), The division number N is obtained based on [Equation 1], and the storage area of the memory unit 11 is divided into a plurality. Here, for example, the capture time data is input by the user via the operation unit 13, and other data is stored in the memory dividing unit 31 in advance.

[Equation 1]
N = M / (T, S, D / 8)

  The trigger input detection unit 32 detects, for example, a trigger input indicating the timing for storing the waveform data in one storage area of the memory unit 11 when the output level of the ADC 25 exceeds a predetermined level. It is like that. The trigger input detection unit 32 is an example of a trigger input detection unit.

  The capture unit 33 is configured to repeatedly capture waveform data in one storage area until the trigger input is detected after the trigger input detection unit 32 starts detecting the trigger input. The capture unit 33 is an example of a capture unit.

  The data storage unit 34 includes pre-trigger data indicating data input by the memory unit 11 within a predetermined time before the trigger detection time when the trigger is detected on the condition that the trigger input detection unit 32 detects the trigger input. The post-trigger data indicating the data input by the memory unit 11 within a predetermined time after the trigger detection time is stored in one storage area of the memory unit 11. The data storage unit 34 is an example of a data storage unit.

The predetermined time when the pre-trigger data is input is a time set as a pre-trigger time (time from the pre-trigger time to the trigger time) by the user via the operation unit 13. Further, the predetermined time when the post-trigger data is input is a time based on the capture time set by the user via the operation unit 13.

  The data transfer unit 35 transfers pre-trigger data and post-trigger data stored by the data storage unit 34 to the control unit 40. The data transfer unit 35 is an example of a data transfer unit.

  The control unit 40 includes a measurement unit 41 and a display control unit 42.

  The measurement unit 41 performs predetermined measurement on the waveform data stored in the memory unit 11. For example, the measurement unit 41 obtains transmission power, modulation accuracy (Error Vector Magnitude, EVM), adjacent channel leakage power ratio (ACLR), phase error, phase error, amplitude error, etc. be able to.

  The display control unit 42 performs display control of information displayed on the display unit 12. For example, the display control unit 42 can perform display control for displaying the measurement result measured by the measurement unit 41 on the display unit 12. Further, for example, the display control unit 42 can perform display control for displaying data desired by the user on the display unit 12 among the data stored in the memory unit 11 based on the operation of the operation unit 13 by the user. .

  The display unit 12 displays predetermined information based on the display control of the display control unit 42.

  The operation unit 13 is operated by the user to set measurement items, measurement conditions, determination conditions, and the like for measuring the signal under measurement. For example, the operation unit 13 includes a display that displays a setting screen for setting various conditions, an input device such as a keyboard, a dial, or a mouse, a control circuit that controls these, software, and the like. Input of measurement conditions and display contents of the display unit 12 are set. As measurement conditions, for example, pre-trigger time, capture time, trigger condition, and the like are set.

  The control device 14 is configured to set various information input by the operation unit 13 in the RF unit 20, the memory control unit 30, and the control unit 40.

  Next, each function of the memory control unit 30 will be described with reference to FIGS. In each figure, the start address is represented by “StartA”, the pre-trigger address is represented by “PreTrigA”, and the trigger address is represented by “TrigA”.

  For example, as illustrated in FIG. 2, the memory dividing unit 31 divides the storage area 50 of the memory unit 11 into three to obtain ring buffer type storage areas (hereinafter referred to as “local ring buffer memory”) 51 to 53. . For example, the storage area of the local ring buffer memory 51 is represented by start addresses A to A + X. Here, X indicates the number of addresses corresponding to the sum of a predetermined pre-trigger time and a predetermined capture time. The values of the start address A and the start address A + X are stored by the memory dividing unit 31.

  The storage area of the local ring buffer memory 51 is configured as shown in FIG. That is, the local ring buffer memory 51 includes a storage area 51a determined by the pre-trigger time, and storage areas 51b and 51c determined by the capture time. The local ring buffer memories 52 and 53 are similarly configured.

The capture unit 33, the storage area 51c towards the start address A to the start address A + X, 51a, in the order of 51b, the detection of the trigger input is started by the trigger input detection unit 32, the input of the trigger is detected At the same time, the acquisition of waveform data is continued .

  When the trigger input detection unit 32 detects the trigger input, the data storage unit 34 sequentially stores the pre-trigger data in the storage area 51 a and the post-trigger data in the storage areas 51 b and 51 c, in the local ring buffer memory 51. The capture is complete. The value of the trigger address is stored by the memory dividing unit 31.

  FIG. 4 is a diagram showing the overall operation of the local ring buffer memories 51-53.

  As shown in FIG. 4A, the capture unit 33 continues to capture data in the first local ring buffer memory 51.

  In the local ring buffer memory 51, when the trigger input is detected by the trigger input detection unit 32, as shown in FIG. 4B, the value of the trigger address is stored by the memory dividing unit 31, and the local ring buffer memory The capture at 51 is complete. Subsequently, the capture unit 33 continues to capture data in the second local ring buffer memory 52 so as not to miss the next trigger.

  In the local ring buffer memory 52, when a trigger input is detected by the trigger input detection unit 32, as shown in FIG. 4C, the value of the trigger address is stored by the memory dividing unit 31, and the local ring buffer memory The capture at 52 is complete. Subsequently, the capture unit 33 continues to capture data in the third local ring buffer memory 53 so as not to miss the next trigger.

  As described above, when the pre-trigger data and the post-trigger data are stored in one local ring buffer memory, the spectrum analyzer 10 can start capturing waveform data in the next local ring buffer memory. Never miss it.

  Next, the function of the data transfer unit 35 will be described with reference to FIG. FIG. 5 is a diagram showing a storage state of the memory unit 11 in a state where the measurement data is captured, and shows each data stored in the storage area 50 of the memory unit 11.

  The local ring buffer memory 51 stores pre-trigger data 61 stored in an area from the pre-trigger address to the trigger address and post-trigger data 62 and 63 stored after the trigger address.

  Similarly, pre-trigger data 64 and post-trigger data 65 and 66 are stored in the local ring buffer memory 52. The local ring buffer memory 53 stores pre-trigger data 67 and post-trigger data 68 and 69.

  The data transfer unit 35 sequentially reads the pre-trigger data 61 and the post-trigger data 62 and transfers them to the control unit 40. Next, the data transfer unit 35 reads the post-trigger data 63 and transfers it to the control unit 40.

  Similarly, the data transfer unit 35 sequentially reads the pre-trigger data 64 and the post-trigger data 65 and transfers them to the control unit 40. Next, the data transfer unit 35 reads the post-trigger data 66 and transfers it to the control unit 40.

  Further, the data transfer unit 35 sequentially reads the pre-trigger data 67 and the post-trigger data 68 and transfers them to the control unit 40. Next, the data transfer unit 35 reads the post-trigger data 69 and transfers it to the control unit 40.

  In addition, arbitrary data among each data memorize | stored in the local ring buffer memories 51-53 can also be displayed on the display part 12 by control of the display control part 42 through operation of the operation part 13 by a user. . That is, the spectrum analyzer 10 can display data captured in the past to the user.

  Next, the operation of the spectrum analyzer 10 in the present embodiment will be described with reference to FIG. The operation related to the memory unit 11 and the memory control unit 30 which are characteristic parts of the spectrum analyzer 10 will be mainly described.

  For example, based on the capture time set by the user through the operation unit 13, the memory dividing unit 31 obtains the division number n by the above-described [Equation 1], and divides the storage area of the memory unit 11 into a plurality of n rings. A local ring buffer memory in the buffer format is used (step S11).

  When the memory division unit 31 divides the storage area of the memory unit 11 into, for example, three (n = 3) (see FIG. 2), each of the start address A, the start address A + X, the start address A + 2X, and the start address A + 3X. The value is stored (step S12).

  The memory control unit 30 initializes a variable i indicating the i-th of the local ring buffer memory (step S13).

  The memory control unit 30 increments the variable i (step S14).

  The trigger input detection unit 32 starts detecting the trigger input, and the capture unit 33 continues to capture data in the i-th local ring buffer memory (step S15). In the present embodiment, the first is the local ring buffer memory 51, the second is the local ring buffer memory 52, and the third is the local ring buffer memory 53.

  The trigger input detection unit 32 determines whether or not there is a trigger input (step S16).

  If it is not determined in step S16 that a trigger has been input, the process returns to step S15.

  On the other hand, if it is determined in step S16 that a trigger is input, the memory dividing unit 31 stores a trigger address at which data at the time of trigger input is captured (step S17).

  The data storage unit 34 stores a predetermined amount (the amount of data determined by the capture time) of pre-trigger data and post-trigger data in the i-th local ring buffer memory (step S18).

  The memory control unit 30 determines whether or not the variable i = n (step S19).

  If it is not determined in step S19 that the variable i = n, the process returns to step S14.

  On the other hand, when it is determined in step S19 that the variable i = n, that is, when all the captures of the local ring buffer memories 51 to 53 are completed, the memory control unit 30 initializes the variable i (step S19). S20).

  The memory control unit 30 increments the variable i (step S21).

  The data transfer unit 35 transfers the pre-trigger data and post-trigger data stored in the i-th local ring buffer memory by the data storage unit 34 to a predetermined destination (step S22).

  The memory control unit 30 determines whether or not the variable i = n (step S23).

  If it is not determined in step S23 that the variable i = n, the process returns to step S21.

  On the other hand, if it is determined in step S23 that the variable i = n, the process ends.

  As described above, the spectrum analyzer 10 according to the present embodiment includes the data storage unit 34 that stores pre-trigger data indicating data input within a predetermined time before the trigger detection time when the trigger is detected. Can also measure previous data.

  In addition, the spectrum analyzer 10 according to the present embodiment includes a memory dividing unit 31 that divides a storage area for storing waveform data into a plurality of ring buffer storage areas, and thus captures in the past in a ring buffer storage area. The displayed data can be displayed to the user.

  Therefore, the spectrum analyzer 10 in the present embodiment can measure data before the trigger input, and can display data captured in the past to the user.

  As described above, the measuring apparatus and the measuring method according to the present invention have an effect of being able to measure data before the trigger input and display data captured in the past to the user. Therefore, it is useful as a measuring device and a measuring method for measuring a high-frequency signal output from the device under measurement.

1 DUT (device under test)
10 Spectrum analyzer (measuring device)
11 Memory part (waveform data memory means)
30 memory control unit 31 memory dividing unit (storage area dividing means)
32 Trigger input detection unit (trigger input detection means)
33 Capture section (capture means)
34 Data storage unit (data storage means)
35 Data transfer unit (data transfer means)
50 storage areas 51 to 53 local ring buffer memory (ring buffer type storage area , local ring buffer memory area )
51a storage area (storage area for pre-trigger data)
51b, 51c Storage area (storage area for post-trigger data)
61, 64, 67 Pre-trigger data 62, 63, 65, 66, 68, 69 Post-trigger data

Claims (4)

A measuring device (10) for measuring waveform data output from a device under measurement (1),
Waveform data memory means (11) having a storage area (50) for storing the waveform data;
A storage area dividing means (31) for setting the plurality of local ring buffer memory areas (51-53) by dividing the storage area into a plurality based on the measurement conditions of the waveform data set in advance ;
Trigger input detection means (32) for detecting an input of a trigger indicating a timing for sequentially storing the waveform data exceeding a predetermined level in the plurality of local ring buffer memory areas ;
For each of said plurality of local ring buffer memory area, wherein the trigger input detecting means thus based on said measurement condition set by pretrigger time and in the input of the trigger detection as the time before the input of the trigger is detected Capture means (33) for repeating the capture of the waveform data within a post-trigger time set based on the measurement condition as the time after
Wherein the trigger input detecting means on condition that the input is detected in the trigger for any one region of the plurality of local ring buffer memory area, the pre-trigger data indicating the waveform data inputted into the pre-trigger trigger time ( 61) and post-trigger data (62, 63) indicating the waveform data input within the post-trigger time , data storage means (34) for storing and storing in any one area ;
A measuring apparatus comprising: The trigger input detection means detects the trigger input for each of the storage areas in a predetermined order,
The capture means, when the pre-trigger data and the post-trigger data are stored in the one area by the data storage means, in the next local ring buffer memory area based on the order, is intended to start the capture,
The measuring apparatus according to claim 1.   The measuring apparatus according to claim 1 or 2, further comprising a data transfer means (35) for transferring the pre-trigger data and the post-trigger data stored by the data storage means. A measurement method using a measurement device (10) for measuring waveform data output from a device under measurement (1),
The measuring apparatus comprises waveform data memory means (11) having a storage area (50) for storing the waveform data,
A measurement condition setting step for presetting measurement conditions of the waveform data;
A storage area dividing step (S11) for setting the plurality of ring buffer memory areas (51 to 53) by dividing the storage area into a plurality of parts based on the measurement conditions ;
A trigger input detection step (S16) for detecting an input of a trigger indicating a timing for sequentially storing the waveform data exceeding a predetermined level in the plurality of local ring buffer memory areas ;
A time setting step of setting based on the post-trigger time after the pre-trigger time and the input of the trigger before the trigger input detecting step Hence the input of the trigger is detected is detected in each of the measurement conditions,
A capture step (S15) for repeatedly capturing the waveform data within the pre-trigger time and the post-trigger time for each of the plurality of local ring buffer memory regions ;
Pre-trigger data indicating waveform data input within the pre-trigger trigger time on condition that the trigger input is detected for any one of the plurality of local ring buffer memory areas in the trigger input detection step 61) and post-trigger data (62, 63) indicating the waveform data input within the post-trigger time , a data storing step (S18) for storing and storing in one of these areas ;
A measurement method comprising:

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