CN114859281A - Calibration device and method for function generator - Google Patents
Calibration device and method for function generator Download PDFInfo
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Abstract
The invention discloses a calibration device and a calibration method of a function generator, wherein the calibration device comprises: the industrial personal computer is connected with the input end of the function generator and is used for controlling the function generator to output a signal to be detected according to a preset configuration file; the network switch is connected with the industrial personal computer and is used for being controlled by the industrial personal computer to establish communication between the function generator and the measuring instrument; and the measuring instrument is connected with the network switch and used for measuring the signal to be detected and sending the measuring result to the industrial personal computer through the network switch. The invention can automatically test the function generator, saves a large amount of manpower and material resources and greatly improves the working efficiency.
Description
Technical Field
The invention relates to the technical field of signal generator verification, in particular to a verification device and a verification method for a function generator.
Background
The function generator is an instrument for generating various time function waveforms such as sine waves, square waves, triangular waves, pulse waves, Amplitude Modulation (AM), Frequency Modulation (FM), Phase Modulation (PM), Frequency Shift Keying (FSK), BURST pulses (BURST), frequency SWEEP (SWEEP) and the like by using a Direct Digital Synthesis (DDS), and can be applied to multiple fields such as measurement, communication and the like. Just because of the wide application of function generators, the performance index of the function generator will directly affect the correctness of the test or the test result, because the verification of the function generator is particularly important.
According to the traditional manual verification mode, the following problems and defects exist:
(1) the manual operation efficiency is low: in order to complete the verification of more than ten parameters of one function generator, at least half a day or even longer is needed;
(2) the verification process is not standardized: because the verification process is manually completed by a person, the verification process is easy to generate artificial deviation, so that the confidence coefficient of a verification result is reduced;
(3) the verification process is difficult to reproduce: because the verification conditions and the operation behaviors are not programmed, the verification process is subjected to multiple limits and even difficult to reproduce due to human factors;
(4) the verification result is manually read and recorded, so that hand errors are avoided and errors are caused.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the calibration device and the calibration method of the function generator, which can automatically calibrate the function generator, save a large amount of manpower and material resources and greatly improve the working efficiency.
First aspect
The invention provides a calibrating device of a function generator, which is connected with the function generator and used for calibrating a signal output by the function generator; the verification device comprises:
the industrial personal computer is connected with the input end of the function generator and is used for controlling the function generator to output a signal to be detected according to a preset configuration file;
the network switch is connected with the industrial personal computer and is used for being controlled by the industrial personal computer to establish communication between the function generator and the measuring instrument;
and the measuring instrument is connected with the network switch and used for measuring the signal to be detected and sending a measuring result to the industrial personal computer through the network switch.
Preferably, the network switch comprises a main communication port and a plurality of branch communication ports, and the network switch is controlled by the industrial personal computer to establish connection between the main communication port and the branch communication ports; the main communication port is connected with a function generator; the communication division port is connected with the measuring instrument.
Preferably, the measuring instrument comprises:
the oscilloscope is used for measuring the space ratio of the signal to be detected;
and the digital multimeter is used for measuring the amplitude of the signal to be detected.
Preferably, the measuring instrument further comprises:
and the frequency meter is used for measuring the frequency of the signal to be detected.
Preferably, the measuring instrument further comprises:
and the spectrum analyzer is used for measuring the harmonic waves of the signal to be detected.
Preferably, the measuring instrument further comprises:
and the distortion measuring instrument is used for measuring the total harmonic distortion of the signal to be detected.
Preferably, the industrial personal computer is further configured to calculate according to the measurement result and the configuration file, and output a verification result.
Preferably, the industrial personal computer is preset with a report template and is further used for automatically generating a verification report according to the verification result.
Second aspect of the invention
The invention provides a method for calibrating a lecture generator, which is based on a calibrating device of a function generator in the first aspect; the assay method comprises the following steps:
respectively connecting a trigger signal output end of the function generator with a first channel of the oscilloscope and an external trigger input channel of the digital multimeter; the signal to be detected comprises a triangular wave;
respectively connecting a port of the function generator, which outputs a signal to be detected, with a second channel of the oscilloscope and a voltage measurement input channel of the digital multimeter;
the industrial personal computer controls the function generator to output triangular waves;
observing the distortion condition of the triangular wave by using an oscilloscope, and determining the positions of a plurality of test points on the rising edge and the falling edge of the triangular wave;
measuring voltages respectively corresponding to the plurality of test points by utilizing a trigger delay function of the digital multimeter;
according to the result of the digital multimeter measurement, the best fitting straight line of the unary linear regression is obtained by applying a least square method;
and calculating residual errors between the measurement results of the digital multimeter and the corresponding points of the best fit straight line, and comparing to obtain the maximum residual error, namely the linearity of the triangular wave.
The invention has the beneficial effects that:
the function generator can be automatically verified, so that a large amount of manpower and material resources are saved, and the working efficiency is greatly improved; only simple connection and mouse operation are needed, and the flow of measurement work is simplified; because the metering process is controlled by the industrial personal computer, the same data can be measured for many times, so that the reliability of the verification result is higher; manual recording and calculation are not needed, and writing errors possibly occurring in the manual recording and calculation process are avoided; the linearity of the triangular wave can be measured through a digital multi-purpose meter and an oscilloscope, the operation setting is simplified, and better voltage measurement accuracy can be kept.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic structural diagram of a calibration device of a function generator according to an embodiment of the present invention;
fig. 2 is a flowchart of an example of a verification apparatus for a function generator according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
The first embodiment is as follows:
as shown in fig. 1, an embodiment of the present invention provides a calibration apparatus for a function generator, which is connected to the function generator and is used for calibrating a signal output by the function generator. The verification device comprises:
the industrial personal computer is connected with the input end of the function generator and is used for controlling the function generator to output a signal to be detected according to a preset configuration file;
the network switch is connected with the industrial personal computer and is used for being controlled by the industrial personal computer to establish communication between the function generator and the measuring instrument;
and the measuring instrument is connected with the network switch and used for measuring the signal to be detected and sending the measuring result to the industrial personal computer through the network switch.
In the embodiment of the invention, the industrial personal computer adopts the Tuhua model of TPC-1581 WP. The industrial personal computer has the following characteristics:
15.6 inches high definition TFT wide screen LCD multi-touch industrial tablet computer, with Intel fourth generation core i3 processor.
Industrial grade 15.6 inch high definition TFT LCD, LED backlight life 50,000 hours;
intel fourth generation core i3-4010U processor, 4GB DDR3L memory;
a 16:9 wide screen projecting a capacitive multi-touch screen;
front panel IP66 protection grade, panel installation;
an intelligent key and a Home key are built in, and an intuitive user interface is easily set;
the color LED indicator lamp displays the operation state;
the shell is protected by grounding;
the HDMI interface and audio multimedia transmission are supported;
scratch the touch surface against 7H hardness.
In the embodiment of the invention, the industrial personal computer generates an instrument connection instruction and a waveform output instruction according to a preset configuration file, and the network switch establishes connection between the function generator and the measuring instrument according to the instrument connection instruction. The function generator sends a waveform signal to the measuring instrument according to the waveform output instruction, the measuring instrument measures the waveform signal to obtain a measuring result and outputs the measuring result to the industrial personal computer, and the industrial personal computer calculates according to the configuration file and the measuring result to obtain a verification result.
The calibrating device of the function generator can automatically calibrate the function generator, thereby greatly simplifying the flow of metering work; because the metering process is controlled by the industrial personal computer, the same data can be measured for many times, so that the reliability of the verification result is higher; manual recording and calculation are not needed, and writing errors possibly occurring in the manual recording and calculation process are avoided.
The network switch comprises a main communication port and a plurality of branch communication ports, and the network switch is controlled by the industrial personal computer to establish connection between the main communication port and the branch communication ports. The main communication port is connected with the function generator, and the branch communication port is connected with the measuring instrument.
In the embodiment of the invention, the network switch is used for connecting the main communication port and the corresponding branch communication ports according to the instruction sent by the industrial personal computer and communicating the corresponding channels. According to the embodiment of the invention, through the selection of the network switch channel, the switching of different measuring instruments can be realized, and the convenience is improved.
In an embodiment of the present invention, a measurement instrument includes:
the oscilloscope is used for measuring the space ratio of the signal to be detected;
the digital multimeter is used for measuring the amplitude of the signal to be detected;
the frequency meter is used for measuring the frequency of the signal to be detected;
the spectrum analyzer is used for measuring the harmonic waves of the signal to be detected;
and the distortion measuring instrument is used for measuring the total harmonic distortion of the signal to be detected.
The oscilloscope can measure the relevant characteristics of the square wave and the pulse, including rise time, fall time, upper overshoot, lower overshoot, the space ratio and the like. In the embodiment of the invention, the oscilloscope can be a 4456E digital fluorescence oscilloscope produced by a Mitsui instrument.
The digital multimeter can measure the amplitude of sine waves, triangular waves and square waves output by the function generator, the digital multimeter measures effective values, and the peak-to-peak value of the waveform amplitude is calculated according to coefficients of different waveform effective values and different peak-to-peak values. In the embodiment of the present invention, the digital multimeter can adopt 34470A.
The frequency refers to the number of times that the periodic signal changes in unit time, and in the embodiment of the present invention, the frequency meter uses a counting method to implement frequency measurement, specifically, the frequency meter implements frequency measurement by measuring the number of the measured periodic signals. In the embodiment of the invention, the frequency meter can be a Keysight 53220A frequency meter
The spectrum analyzer can measure the second harmonic in the signal to be detected, and in the embodiment of the invention, the spectrum analyzer can be produced by Rode
FSVA3007 instrument.
The distortion degree measuring instrument can measure the total harmonic distortion in the sinusoidal wave signal based on a suppression method, and in the embodiment of the invention, the distortion degree measuring instrument can adopt a KH4135 type distortion degree measuring instrument produced by Kaiyun innovative technology Limited company.
In the embodiment of the invention, the industrial personal computer is also used for calculating according to the measurement result and the configuration file and outputting the verification result. The industrial personal computer is preset with a report template and is also used for automatically generating a verification report according to a verification result.
To better illustrate one inventive verification apparatus for a function generator, the following examples are listed:
as shown in fig. 2, the industrial personal computer runs a verification program and selects verification items. The verification items can be set according to actual needs, for example, the first item is set as: measuring the space ratio of the pulse; the second term is: measuring the amplitude of the triangular wave; the third term is: measuring the frequency of the sine wave; the fourth term is: measuring the second harmonic of the sine wave; the fifth item is: the total harmonic distortion of the sinusoidal wave is measured.
And detecting whether the test cable is connected or not by manual judgment, and if so, judging whether the test cable is connected or not. The verification project carries out automatic test, and the automatic test process comprises the following steps: the industrial personal computer controls the function generator to output pulses, controls the network switch to connect with the corresponding channel, and is connected with the oscilloscope. The oscilloscope receives the pulse and measures the space ratio of the pulse, the measurement result is sent to the industrial personal computer after the measurement is finished, and the industrial personal computer calculates the configuration file and the measurement data to obtain a space ratio verification result. And then automatically testing the verification items of the second item to the fifth item in sequence.
And after all verification items are measured, the industrial personal computer automatically generates verification reports for all verification results based on the preset report template.
Example two:
due to the limitation of the conventional triangular wave linearity test method, the embodiment of the invention provides a function generator calibration method based on the function generator calibration device of the first embodiment, which comprises the following steps:
respectively connecting a trigger signal output end of the function generator with a first channel of the oscilloscope and an external trigger input channel of the digital multimeter; the signal to be detected comprises a triangular wave;
respectively connecting a port of the function generator, which outputs a signal to be detected, with a second channel of the oscilloscope and a voltage measurement input channel of the digital multimeter;
the industrial personal computer controls the function generator to output triangular waves;
observing the distortion condition of the triangular wave by using an oscilloscope, and determining the positions of a plurality of test points on the rising edge and the falling edge of the triangular wave;
measuring voltages respectively corresponding to the plurality of test points by using a trigger delay function of the digital multimeter;
according to the result of the digital multimeter measurement, the best fitting straight line of the unary linear regression is obtained by applying a least square method;
and calculating residual errors between the measurement results of the digital multimeter and the corresponding points of the best fit straight line, and comparing to obtain the maximum residual error, namely the linearity of the triangular wave.
The embodiment of the invention adopts a digital multimeter and an oscilloscope to measure the linearity of the triangular wave, wherein the oscilloscope is used for observing the distortion condition of the triangular wave, so that the corresponding test point positions on the rising edge and the falling edge can be conveniently determined, and the digital multimeter is used for testing the voltages corresponding to different test points of the triangular wave. In the embodiment of the invention, the conventional equipment synchronous output mode is abandoned, the trigger output of the special equipment is utilized to output the synchronous oscilloscope and the digital multimeter, and the trigger output is utilized as the reference. The positions of different test points on the rising edge and the falling edge of the triangular wave are accurately positioned by adjusting the initial trigger phase of the triangular wave. The trigger delay function of the digital multimeter is also utilized, the trigger delay is set at a proper fixed time, the trigger delay time does not need to be changed for voltage tests of different test points, the operation setting is simplified, and better voltage measurement accuracy can be kept.
The embodiment of the invention provides a calibration device and a calibration method of a function generator, which can automatically calibrate the function generator, save a large amount of manpower and material resources and greatly improve the working efficiency; only simple connection and mouse operation are needed, and the measuring work flow is simplified; because the metering process is controlled by the industrial personal computer, the same data can be measured for many times, so that the reliability of the verification result is higher; manual recording and calculation are not needed, and writing errors possibly occurring in the manual recording and calculation process are avoided; the linearity of the triangular wave can be measured through a digital multi-purpose meter and an oscilloscope, the operation setting is simplified, and better voltage measurement accuracy can be kept.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (9)
1. The calibration device of the function generator is connected with the function generator and used for calibrating the signal output by the function generator; characterized in that, the calibrating installation includes:
the industrial personal computer is connected with the input end of the function generator and is used for controlling the function generator to output a signal to be detected according to a preset configuration file;
the network switch is connected with the industrial personal computer and is used for being controlled by the industrial personal computer to establish communication between the function generator and the measuring instrument;
and the measuring instrument is connected with the network switch and used for measuring the signal to be detected and sending a measuring result to the industrial personal computer through the network switch.
2. The verification device of a function generator as claimed in claim 1, wherein the network switch comprises a main communication port and a plurality of branch communication ports, and the network switch is controlled by the industrial personal computer to establish connection between the main communication port and the branch communication ports; the main communication port is connected with a function generator; the communication division port is connected with the measuring instrument.
3. The certification apparatus for a function generator according to claim 1, wherein the measuring instrument comprises:
the oscilloscope is used for measuring the space ratio of the signal to be detected;
and the digital multimeter is used for measuring the amplitude of the signal to be detected.
4. The certification apparatus for a function generator according to claim 3, wherein the measuring instrument further comprises:
and the frequency meter is used for measuring the frequency of the signal to be detected.
5. The certification apparatus for a function generator according to claim 3, wherein the measuring instrument further comprises:
and the spectrum analyzer is used for measuring the harmonic waves of the signal to be detected.
6. The certification apparatus for a function generator according to claim 3, wherein the measuring instrument further comprises:
and the distortion measuring instrument is used for measuring the total harmonic distortion of the signal to be detected.
7. A certification apparatus for a function generator according to claim 3,
the industrial personal computer is also used for calculating according to the measuring result and the configuration file and outputting a verification result.
8. The calibrating apparatus for a function generator as claimed in claim 7, wherein the industrial personal computer is pre-provided with a report template and is further configured to automatically generate a calibration report according to the calibration result.
9. A method for calibrating a function generator, characterized by comprising the step of calibrating the function generator according to any one of claims 3 to 7; the assay method comprises the following steps:
respectively connecting a trigger signal output end of the function generator with a first channel of the oscilloscope and an external trigger input channel of the digital multimeter; the signal to be detected comprises a triangular wave;
respectively connecting a port of the function generator, which outputs a signal to be detected, with a second channel of the oscilloscope and a voltage measurement input channel of the digital multimeter;
the industrial personal computer controls the function generator to output triangular waves;
observing the distortion condition of the triangular wave by using an oscilloscope, and determining the positions of a plurality of test points on the rising edge and the falling edge of the triangular wave;
measuring voltages respectively corresponding to the plurality of test points by utilizing a trigger delay function of the digital multimeter;
according to the result of the digital multimeter measurement, the best fitting straight line of the unary linear regression is obtained by applying a least square method;
and calculating residual errors between the measurement results of the digital multimeter and the corresponding points of the best fit straight line, and comparing to obtain the maximum residual error, namely the linearity of the triangular wave.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115356392A (en) * | 2022-08-30 | 2022-11-18 | 中广核检测技术有限公司 | Multichannel eddy meter verification equipment and method |
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