CN103176013B - An Oscilloscope with Customizable Measurement Range and Its Realization Method - Google Patents

Abstract

The invention provides an oscilloscope capable of customizing the measurement range and its implementation method, comprising: a measurement range setting module, a measurement item setting module, a waveform data acquisition module, a waveform measurement module and a display module; a measurement range setting module, It is used to set the positions of two vertical cursor lines respectively, and the range defined by the two vertical cursor lines is a custom measurement range; the waveform measurement module is used to adjust the obtained custom measurement items according to the set measurement items. The waveform data within the measurement range is analyzed and calculated to obtain the corresponding measurement results. The user determines the user-defined measurement range by setting the position of the cursor line, so that the parameters of the local waveform can be conveniently measured according to their own needs.

Description

An Oscilloscope with Customizable Measurement Range and Its Realization Method

technical field

The invention relates to the technical field of precision instrument measurement, in particular to an oscilloscope with a customizable measurement range and an implementation method thereof.

Background technique

Existing oscilloscopes all have measurement functions, which are generally based on two measurement modes: automatic setting measurement and specified setting measurement.

The automatic setting measurement is used to automatically adjust the vertical and horizontal settings of the oscilloscope, so as to clearly present the input signal to the user according to the user-specified rules such as period and edge. The core of automatic setting is to determine the vertical and horizontal setting parameters of the oscilloscope by measuring the signal input to the oscilloscope.

To specify the measurement settings, the user first specifies the measurement items, and then the oscilloscope measures the waveform data according to the measurement items.

Currently, oscilloscopes either use all the acquired data to make measurements, or only use the screen data visible to the user to make measurements, and the user cannot use only the part of the data that is of interest to the user.

Regardless of the above-mentioned automatic setting measurement or specified setting measurement, the measurement range is predefined by the manufacturer, and the user cannot modify the measurement range. When the user expects to obtain the measurement results of only part of the waveform data in use, it can only be achieved indirectly by adjusting the oscilloscope settings (that is, using part of the waveform data displayed on the screen), or it cannot be achieved at all (that is, using all the data). No matter which measurement mode is used above, it will bring great inconvenience to the user.

Therefore, it is necessary for us to design an oscilloscope with a customizable measurement range and its implementation method, so as to provide users with a more flexible oscilloscope measurement method with a customizable measurement range.

Contents of the invention

The main purpose of the present invention is to solve the problems existing in the prior art, and provide an oscilloscope with a customizable measurement range and its implementation method.

The purpose of the present invention is achieved through the following technical solutions:

A method for realizing an oscilloscope with a customizable measurement range, characterized in that it includes:

The positions of the two vertical cursor lines are respectively set; the vertical cursor lines can move along the horizontal axis; the two vertical cursor lines are respectively the first cursor line and the second cursor line; the first cursor The range defined by the line and the second cursor line is the custom measurement range;

Set measurement items;

Obtain the waveform data within the custom measurement range from the original waveform data;

Analyze and calculate the acquired waveform data within the custom measurement range according to the set measurement items to obtain the corresponding measurement results;

The measurement results are displayed.

While setting the positions of the first cursor line and the second cursor line, the positions of two horizontal cursor lines are also set respectively; the horizontal cursor lines can move along the vertical axis; the two horizontal cursor lines are respectively are the third cursor line and the fourth cursor line; the area defined by the first, second, third, and fourth cursor lines is a custom measurement range.

The setting methods for each of the cursor lines can be: knob key setting method, touch screen selection method, mouse selection method or remote command configuration parameter method.

In the step of acquiring waveform data, there is also a step of comparing the starting address of waveform acquisition with the user-defined starting address, including:

Compare the time sequence of the waveform acquisition start address and the user-defined start address; if the waveform acquisition start address is earlier than the user-defined start address, the waveform data will be acquired starting from the user-defined start address; if the user-defined start address If it is earlier than the waveform acquisition start address, the waveform data will be acquired starting from the waveform acquisition start address.

In the step of obtaining the waveform data within the custom measurement range from the original waveform data, track preprocessing is also performed on the original waveform data, and the waveform within the custom measurement range is obtained from the waveform envelope of the track preprocessing data;

The trajectory preprocessing includes:

The original waveform data is grouped by time; the maximum and minimum values in each group of the original waveform data are extracted; and the waveform envelope is formed by the extracted maximum and minimum values of each group.

An oscilloscope with a customizable measurement range, characterized in that it at least includes: a measurement range setting module, a measurement item setting module, a waveform data acquisition module, a waveform measurement module and a display module;

The measurement range setting module is used to respectively set the positions of two vertical cursor lines; the vertical cursor lines can move along the horizontal axis; the two vertical cursor lines are the first cursor line and the first cursor line respectively. The second cursor line; the range defined by the first cursor line and the second cursor line is a custom measurement range;

The measurement item setting module is used to set the measurement items;

The waveform data obtaining module is used to obtain the waveform data in the custom measurement range from the original waveform data;

The waveform measurement module is used to analyze and calculate the acquired waveform data within the custom measurement range according to the set measurement items, and obtain corresponding measurement results;

The display module is used to display the measurement results.

Two horizontal cursor lines are also set in the measurement range setting module; the horizontal cursor lines can move along the vertical axis; the two horizontal cursor lines are respectively the third cursor line and the fourth cursor line ; The measurement range setting module is also used to respectively set the positions of the two horizontal cursor lines; the areas defined by the first, second, third and fourth cursor lines are self-defined measurement ranges.

The measurement range setting module can set the respective cursor lines in the following ways: knob key setting, touch screen selection, mouse selection or remote command configuration parameters.

A start address comparison module is also arranged in the waveform data acquisition module;

The start address comparison module is used to compare the time order of the waveform acquisition start address and the user-defined start address; if the waveform acquisition start address is earlier than the user-defined start address, then the user-defined start address is Start to acquire waveform data; if the user-defined start address is earlier than the waveform acquisition start address, start to acquire waveform data with the waveform acquisition start address.

A trajectory preprocessing module is also provided in the waveform data acquisition module;

The trajectory preprocessing module is used to group the original waveform data in units of time; extract the maximum value and minimum value in each group of the original waveform data; form a waveform by extracting the maximum value and minimum value of each group envelope;

The waveform data obtaining module obtains the waveform data in the self-defined measurement range from the waveform envelope formed by the trajectory preprocessing module.

Through the embodiment of the present invention, the user can determine the measurement range defined by the user by setting the position of the corresponding cursor line. Because the determination of the custom measurement range is more flexible, users can conveniently measure the parameters of local waveforms according to their own needs.

Description of drawings

The drawings described here are used to provide further understanding of the present invention, constitute a part of the application, and do not limit the present invention. In the attached picture:

Fig. 1 is the flow chart of the realization method of the oscilloscope which can customize the measurement range;

Figure 2 is a schematic diagram of the waveform data range;

Figure 3 is Figure 1 of an oscilloscope embodiment with a customizable measurement range;

Figure 4 is Figure 2 of an oscilloscope embodiment with a customizable measurement range;

Fig. 5 is Fig. 3 of an oscilloscope embodiment with a customizable measurement range;

Figure 6 is a schematic structural diagram of an oscilloscope module with a customizable measurement range;

FIG. 7 is a schematic diagram of data range mapping.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

FIG. 1 is a flowchart of an implementation method of an oscilloscope with a customizable measurement range according to the present invention. As shown in the figure, the implementation method of the oscilloscope with a customizable measurement range includes:

1. Set the positions of two vertical cursor lines respectively; the vertical cursor lines can move along the horizontal axis; the two vertical cursor lines are respectively the first cursor line and the second cursor line; The range defined by the first cursor line and the second cursor line is the custom measurement range;

2. Set the measurement items.

At present, oscilloscopes provide users with a variety of signal analysis measurement items, such as period, frequency, rise time, fall time, positive pulse width, negative pulse width, duty cycle, etc. Here, the measurement items to be performed on the signals within the custom measurement range are mainly set by the user. These measurement items are commonly used measurement items of existing oscilloscopes.

3. Obtain the waveform data within the custom measurement range.

The waveform data acquisition process is to obtain the waveform data within the custom measurement range from the collected waveform data according to the previously set custom measurement range.

4. Analyze and calculate the waveform data in the custom measurement range obtained from the original waveform data according to the set measurement items, and obtain the corresponding measurement results.

The acquisition of waveform data mentioned here is to obtain the relevant waveform data within the self-defined measurement range from the original waveform data obtained after the waveform signal to be measured is sampled.

5. Display the measurement result.

The key to the implementation method of the above-mentioned oscilloscope with a customizable measurement range is that two vertical cursor lines, the first cursor line and the second cursor line, which can be set by the user and can move along the horizontal axis, are set in the oscilloscope. Through the steps 1 Adjust the positions of the two cursor lines to provide users with a custom-settable measurement range, thereby providing users with a more flexible oscillometric measurement method. Figure 2 is a schematic diagram of the waveform data range. Through this figure 2, we can see more clearly the difference between the self-defined measurement range provided by the present invention and the measurement modes of automatic setting measurement and specified setting measurement in the prior art. The so-called automatic setting measurement is to analyze and calculate all the collected waveform data, and its processing range is related to the range of the collected waveform data. The so-called specified setting measurement is analyzed and calculated for the waveform data within the scope of the oscilloscope screen, and the processing range is related to the range of the waveform data displayed on the oscilloscope screen. The determination of the two measurement ranges is not convenient for users to set flexibly. However, the self-defined measurement range provided by the present invention is determined by the user's setting of the positions of the two cursor lines within the screen range of the oscilloscope. Therefore, the determination of its measurement range is more flexible, and users can conveniently measure the parameters of local waveforms according to their own needs.

It should be pointed out that the order of steps 1 and 2 does not have to be based on the order of the above-mentioned processes, and the items to be measured can also be set first, and then the first and second steps that define the custom measurement range can be set. Set the position of the cursor line. The sequence of the above processes should also be within the protection scope of the present invention.

The implementation method of the above-mentioned oscilloscope with a customizable measurement range of the present invention will be further described below through a specific embodiment.

As shown in FIG. 3 , two vertical cursor lines, a first cursor line A and a second cursor line B, are set in the oscilloscope. The user chooses to set the first cursor line A, the second cursor line B or operate the cursor lines AB simultaneously through the operation menu. The initial positions of the cursor lines A and B are generally arbitrarily designated by the manufacturer. For example, in this embodiment, the starting addresses of cursor lines A and B are taken as three grids to the left and right of the center of the screen. The user can change the position of the currently selected cursor line by rotating the knob key.

It should be pointed out that the cursor line adjustment method given in this embodiment is operated through the knob key. But in addition, it can also be realized by any other operation that can change the parameters of the measurement range, for example, selecting a rectangular area on the touch screen, using a mouse to select a rectangular area, using remote commands to configure parameters, etc.

Here, in configuring parameters using a remote command, the remote command is a method for remotely controlling an instrument generally supported by testing and measuring instruments. This configuration method follows the SCPI (Standard Commands for Programmable Instruments, standard command set for programmable instruments) specification.

As shown in Figure 4, select the measurement items in the menu through the buttons. In this example, the "Positive Pulse Width" option is specifically selected. After the setting is completed, the oscilloscope starts to measure the test item according to the set custom measurement range.

In the specific measurement process, firstly, according to the previously set custom measurement range, the waveform data within the custom measurement range is obtained from the collected waveform data, and then according to the set measurement item "positive pulse width", the acquired self-defined Define the waveform data within the measurement range for analysis and calculation, and obtain the corresponding measurement results.

In this embodiment, the waveform measurement is performed in the custom measurement range as shown in Figure 4, then the measured "positive pulse width" should be the pulse width value of the first legal pulse width from left to right in the measurement range "Width= 4.480us". However, if the measurement is performed with a custom measurement range as shown in FIG. 5 , the local pulse width value "Width=1.520us" after the measurement range is reduced. It can be seen that the user can measure different local waveform characteristics by changing the area of the custom measurement range

It can be seen from the above that, in the implementation method of the oscilloscope with a user-defined measurement range, two vertical cursor lines are used to define the user-defined measurement range. In addition, we can further set two horizontal cursor lines, which are respectively the third cursor line and the fourth cursor line. While setting the positions of the first cursor line and the second cursor line, the positions of the two horizontal cursor lines, the third cursor line and the fourth cursor line are also set respectively. The rectangular area defined by the first, second, third, and fourth cursor lines above is the custom measurement range. In this way, the technical solution provided by the present invention not only provides range limitation in the horizontal direction, but also provides range limitation in the vertical direction, so that the setting of the custom measurement range is more comprehensive.

In some cases, the start address of the user-defined measurement range is earlier than the start address of the waveform data collected by the oscilloscope, which will cause errors in the analysis and calculation of the oscilloscope. Therefore, in order to avoid this problem, the present invention is also provided with the comparison step of starting address of waveform acquisition and user-defined starting address in the step of obtaining waveform data in said step 3, specifically as follows:

Compare the time sequence of the waveform acquisition start address and the user-defined start address; if the waveform acquisition start address is earlier than the user-defined start address, the waveform data will be acquired starting from the user-defined start address; if the user-defined start address If it is earlier than the waveform acquisition start address, the waveform data will be acquired starting from the waveform acquisition start address.

Through the above steps, it can be ensured that the waveform data acquired through step 3 is truly valid waveform data.

As shown in Figure 7, assume that MemDepth indicates the collected waveform data (storage depth), HScale indicates the horizontal scale, HOffset indicates the horizontal offset, HSaRate indicates the sampling rate, x _A indicates the screen coordinates of cursor A, and x _B indicates the screen coordinates of cursor B , Start _scr marks the starting position of the screen waveform in the collected waveform data, End _scr marks the stop position of the screen waveform in the collected waveform data, HGrid marks the number of horizontal grids (the number of screen grids used in this example is 14), Start _cursor and End _cursor represent the start and end positions of the cursor in the collected waveform data respectively.

The mapping between the custom measurement range and the waveform data can be calculated as follows:

1 Calculate the mapping between the waveform data on the screen and the acquired waveform data

End _scr = Start _scr +HScale×HGrid×HSaRate

2 Calculate cursor area mapping based on screen waveform mapping

3 Calculate the effective waveform data length

Len＝End _cursor -Start _cursor

Note that the case of Start _cursor <0 or End _cursor >MemDepth needs to be considered when calculating the effective data length.

In recent years, with the development of technology, the storage depth of oscilloscopes has become deeper and higher, and the sampling rate has become higher and higher. The above-mentioned calculation method of sampling has a large amount of calculation when certain time bases or storage depths are fixed. In order to reduce the calculation amount and improve the calculation efficiency , in the step 4 of the present invention, in the step of obtaining waveform data within a custom measurement range from the original waveform data, track preprocessing is also performed on the original waveform data, and the self-defined waveform is obtained from the waveform envelope of the track preprocessing. Define the waveform data within the measurement range;

The trajectory preprocessing includes: grouping the original waveform data in units of time; extracting the maximum value and minimum value in each grouping of the original waveform data; forming a waveform packet by extracting the maximum value and minimum value of each grouping network.

Through the above trajectory preprocessing of the original waveform data, the step of analyzing and calculating the waveform data in step 4 only needs to analyze and calculate the waveform envelope, which effectively reduces the amount of calculation when analyzing and calculating the waveform data. .

It should be pointed out that the designer can further limit the data range of the trajectory preprocessing. Referring to Fig. 2, the data ranges of the track preprocessing can be: all data ranges, screen display data ranges and custom measurement data ranges. By limiting the data range of trajectory preprocessing, the calculation amount of trajectory preprocessing can be further reduced.

When using trace preprocessing, it is also necessary to define the start _trace of the trace and the end trace of the end _trace , and both are screen pixel coordinates, that is, the unit is grouping. At this time, the Start _cursor and End _cursor are also defined as group coordinates.

Trajectory preprocessing formula:

Start _cursor = x _A × 2

End _cursor = x _B × 2

Len＝End _cursor -Start _cursor

Similarly, the effective waveform data length needs to consider the situation of Start _cursor <Start _trace and End _cursor >End _trace .

Through the above-mentioned trajectory preprocessing method, the original waveform data with a large amount of data can be compressed and simplified into a waveform trajectory envelope form with a small amount of data, and correlation analysis and calculation can be performed on this basis, which greatly reduces the amount of calculation and improves the calculation efficiency of the system. .

FIG. 6 is a schematic structural diagram of an oscilloscope module with a customizable measurement range in the present invention. As shown in the figure, the oscilloscope at least includes: a measurement range setting module, a measurement item setting module, a waveform data acquisition module, a waveform measurement module and a display module.

The measurement range setting module is used to respectively set the positions of two vertical cursor lines; the vertical cursor lines can move along the horizontal axis; the two vertical cursor lines are the first cursor line and the first cursor line respectively. The second cursor line; the range defined by the first cursor line and the second cursor line is a custom measurement range;

The measurement item setting module is used for setting measurement items.

At present, oscilloscopes provide users with a variety of signal analysis measurement items, such as period, frequency, rise time, fall time, positive pulse width, negative pulse width, duty cycle, etc. Here, the measurement items to be performed on the signals within the custom measurement range are mainly set by the user. These measurement items are commonly used measurement items of existing oscilloscopes.

The waveform data obtaining module is used to obtain the waveform data within the custom measurement range from the original waveform data. The waveform data acquisition module acquires waveform data within the custom measurement range from the collected waveform data according to the custom measurement range set by the measurement range setting module.

The waveform measurement module is used to analyze and calculate the acquired waveform data within the custom measurement range according to the set measurement items, and obtain corresponding measurement results.

The display module is used to display the measurement results.

Wherein, in the measurement range setting module, the setting methods available to the user may include: knob key setting method, touch screen selection method, mouse selection method, or remote command configuration parameter method to set the position of the cursor line. adjustment operation.

In addition, two horizontal cursor lines are also set in the measurement range setting module; the horizontal cursor lines can move along the vertical axis; the two horizontal cursor lines are respectively the third cursor lines and the fourth cursor line; the measurement range setting module is also used to respectively set the positions of the two horizontal cursor lines; the regions defined by the first, second, third and fourth cursor lines are custom Measuring range. In this way, the technical solution provided by the present invention not only provides range limitation in the horizontal direction, but also provides range limitation in the vertical direction, so that the setting of the custom measurement range is more comprehensive.

In some cases, the start address of the user-defined measurement range is earlier than the start address of the waveform data collected by the oscilloscope, which will cause errors in the analysis and calculation of the oscilloscope. Therefore, as mentioned above, a start address comparison module is also provided in the waveform data acquisition module. The start address comparison module is used to compare the time order of the waveform acquisition start address and the user-defined start address; if the waveform acquisition start address is earlier than the user-defined start address, then the user-defined start address is Start to acquire waveform data; if the user-defined start address is earlier than the waveform acquisition start address, start to acquire waveform data with the waveform acquisition start address.

As mentioned above, in order to reduce the calculation amount and improve the calculation efficiency, the present invention is also provided with a trajectory preprocessing module in the waveform data acquisition module. The trajectory preprocessing module is used to group the original waveform data in units of time; extract the maximum value and minimum value in each group of the original waveform data; form a waveform by extracting the maximum value and minimum value of each group envelope. The waveform data obtaining module obtains the waveform data in the self-defined measurement range from the waveform envelope formed by the trajectory preprocessing module.

To sum up, the present invention provides a method for realizing an oscilloscope with a user-defined measurement range and the oscilloscope. The user-defined measurement range is determined by setting the position of the corresponding cursor line by the user. Because the determination of the custom measurement range is more flexible, users can conveniently measure the parameters of local waveforms according to their own needs. Any non-creative modification made by those skilled in the art under the design idea should be considered within the protection scope of the present invention.

Claims (8)

1. An implementation method of an oscilloscope with a customizable measurement range, characterized in that, comprising: The positions of the two vertical cursor lines are respectively set; the vertical cursor lines can move along the horizontal axis; the two vertical cursor lines are respectively the first cursor line and the second cursor line; the first cursor The range defined by the line and the second cursor line is the custom measurement range; The setting method of the first cursor line and the second cursor line adopts: a knob key setting method, a touch screen selection method or a remote command configuration parameter method; Set measurement items; Obtain the waveform data within the custom measurement range from the original waveform data; Analyze and calculate the acquired waveform data within the custom measurement range according to the set measurement items to obtain the corresponding measurement results; displaying the measurement results; In the step of obtaining the waveform data within the custom measurement range from the original waveform data, track preprocessing is also performed on the original waveform data, and the waveform within the custom measurement range is obtained from the waveform envelope of the track preprocessing data; The trajectory preprocessing includes: The original waveform data is grouped by time; the maximum and minimum values in each group of the original waveform data are extracted; and the waveform envelope is formed by the extracted maximum and minimum values of each group. 2. The implementation method of the oscilloscope with customizable measurement range as claimed in claim 1, characterized in that: while setting the positions of the first cursor line and the second cursor line, two horizontal cursor lines are also set respectively position; the horizontal cursor lines can move along the vertical axis; the two horizontal cursor lines are respectively the third cursor line and the fourth cursor line; the first, second, third, and fourth cursor lines The area defined by the line is the custom measurement range. 3. The realization method of the oscilloscope with customizable measurement range as claimed in claim 2, characterized in that: the setting method for the third cursor line and the fourth cursor line can be adopted: the knob key setting method , touch screen selection mode, mouse selection mode or remote command configuration parameter mode. 4. the realization method of the oscilloscope of self-defining measuring range as claimed in claim 1, is characterized in that: in the step of described acquisition waveform data, also be provided with the comparison of waveform acquisition start address and user-defined start address steps, including: Compare the time sequence of the waveform acquisition start address and the user-defined start address; if the waveform acquisition start address is earlier than the user-defined start address, the waveform data will be acquired starting from the user-defined start address; if the user-defined start address If it is earlier than the waveform acquisition start address, the waveform data will be acquired starting from the waveform acquisition start address. 5. An oscilloscope with a customizable measurement range, characterized in that it at least includes: a measurement range setting module, a measurement item setting module, a waveform data acquisition module, a waveform measurement module and a display module; The measurement range setting module is used to respectively set the positions of two vertical cursor lines; the vertical cursor lines can move along the horizontal axis; the two vertical cursor lines are the first cursor line and the first cursor line respectively. The second cursor line; the range defined by the first cursor line and the second cursor line is a custom measurement range; the setting method of the first cursor line and the second cursor line is: the knob key setting method , touch screen selection mode or remote command configuration parameter mode; The measurement item setting module is used to set the measurement items; The waveform data obtaining module is used to obtain the waveform data in the custom measurement range from the original waveform data; The waveform measurement module is used to analyze and calculate the acquired waveform data within the custom measurement range according to the set measurement items, and obtain corresponding measurement results; The display module is used to display the measurement results; A trajectory preprocessing module is also provided in the waveform data acquisition module; The trajectory preprocessing module is used to group the original waveform data in units of time; extract the maximum value and minimum value in each group of the original waveform data; form a waveform by extracting the maximum value and minimum value of each group envelope; The waveform data obtaining module obtains the waveform data in the self-defined measurement range from the waveform envelope formed by the trajectory preprocessing module. 6. The oscilloscope with customizable measurement range as claimed in claim 5, characterized in that: two horizontal cursor lines are also set in the measurement range setting module; the horizontal cursor lines can be positioned along the vertical axis Move; the two horizontal cursor lines are respectively the third cursor line and the fourth cursor line; the measurement range setting module is also used to respectively set the positions of the two horizontal cursor lines; the first and the first The area defined by the second, third and fourth cursor lines is the custom measurement range. 7. The oscilloscope with customizable measurement range as claimed in claim 6, characterized in that: the setting mode of the measurement range setting module for the third cursor line and the fourth cursor line can be: a knob Key setting method, touch screen selection method, mouse selection method or remote command configuration parameter method. 8. the oscilloscope of self-defining measurement range as claimed in claim 7, is characterized in that: also be provided with start address comparison module in described waveform data acquisition module; The start address comparison module is used to compare the time order of the waveform acquisition start address and the user-defined start address; if the waveform acquisition start address is earlier than the user-defined start address, then the user-defined start address is Start to acquire waveform data; if the user-defined start address is earlier than the waveform acquisition start address, start to acquire waveform data with the waveform acquisition start address.