CN102148029A - Method for calibrating audio analyzer - Google Patents
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Abstract
The invention relates to the technical field of instrument calibration, in particular relating to a method for calibrating an audio analyzer. The method comprises the following steps: firstly calibrating the audio analyzer in a standard environment, then inspecting the appearance of the audio analyzer, and then carrying out elementary error calibration on the audio analyzer, wherein the elementary error calibration comprises audio analysis function calibration and function calibration on an audio signal generator; and finally drawing a calibration conclusion for the audio analyzer according to all the error results. The method for calibrating the audio analyzer provided by the invention has the advantages that the operating steps are compact and orderly, the test items are strong in pertinency, the operation is convenient and the detection efficiency is higher.
Description
Technical field:
The present invention relates to the instrument calibration technical field, more specifically to the audio analyzer calibration steps.
Background technology:
Audio frequency is a kind of important medium in the multimedia, and the frequency range of the sound signal that we can hear approximately is 20Hz～20kHz, and wherein voice approximately are distributed within 300Hz～4kHz, and music and other natural sounds are gamut distributions.Sound becomes analogue audio frequency through analog machine record or regeneration, is digital audio and video signals through being digitized into again.So-called audio analysis is an analytic target with the digital audio and video signals exactly, is analysis means with the digital signal processing, extracts the process of signal series of characteristics in time domain, frequency domain.
Audio analyzer is the audio analysis equipment of using always, audio analyzer is used for performances such as the waveform characteristic, unevenness, decay, waveform distortion of analysing low frequency signal, concentrate the function of function, D.C. voltmeter and SINAD table of function, the A.C. voltmeter of function, the frequency counter of function, the high-performance distortion analyzer of low distortion audio-source, can be used for detecting products such as low frequency generator, audio frequency sweep generator, various audio class wave filter and low frequency function signal generator.The performance index of audio analyzer affect the accuracy of product quality and analysis of experimental data, therefore, need calibrate the performance index of audio analyzer, judge its whether coincidence detection requirement.And existing audio analyzer calibration steps generally has complexity of operation, the shortcoming that detection efficiency is lower.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, a kind of audio analyzer calibration steps is provided, this method simple operation, detection efficiency is higher.
For achieving the above object, the present invention is achieved by the following technical solutions:
The audio analyzer calibration steps, it may further comprise the steps:
The first step places audio analyzer under the standard environment condition and to calibrate;
In second step, audio analyzer is carried out visual examination;
The 3rd step, audio analyzer is carried out the fundamental error calibration, the fundamental error calibration comprises calibration of audio analysis function and the calibration of audio signal generator function;
Wherein, described audio analysis function calibration comprises:
Input voltage calibrates for error: the input voltage error of using multi-functional prover calibration audio analyzer, regulate the output of multi-functional prover according to check point, regulating audio analyzer makes it be in the measurement level state, the voltage range that makes audio analyzer is at manual state, directly from its voltage display window, read the value of each range measurement point, calibrate each range by calibration point, calculate the input voltage error of audio analyzer;
Incoming frequency calibrates for error: the incoming frequency error of using multi-functional prover calibration audio analyzer, regulate the output frequency of multi-functional prover, directly reading frequency from the frequency display window of audio analyzer is calibrated each range by calibration point, calculates the incoming frequency error of audio analyzer;
Frequency Response calibration: the Frequency Response that uses multi-functional prover calibration audio analyzer, regulate multi-functional prover, its fixed voltage is constant, change its output frequency, directly from the voltage display window of audio analyzer, read voltage, calibrate each range by calibration point, calculate the Frequency Response of audio analyzer;
Input distortion calibration: the input distortion of using degree of distortion instrument calibrating installation calibration audio analyzer, regulate the output distortion degree of degree of distortion instrument calibrating installation, regulating audio analyzer makes it be in the measurement distortion status, directly from the distortion display window of audio analyzer, read distortion value, calibrate each range by calibration point, calculate the input distortion of audio analyzer;
The filter characteristic calibration, comprise the calibration of weighting filter characteristic: the weighting filter characteristic of using multi-functional prover calibration audio analyzer, regulate the reference frequency point that multi-functional prover exports weighting filter to, audio analyzer is set shows zero decibel value, press the multi-functional prover frequency output of calibration point frequency adjustment, directly from the level display window of audio analyzer, read weighted value, calibrate each range, calculate the weighting filter characteristic error of audio analyzer by calibration point;
The filter characteristic calibration, comprise the pass band filter characteristic calibration: the pass band filter characteristic of using multi-functional prover calibration audio analyzer, regulate the intrinsic frequency filtering of multi-functional prover output audio analyser, audio analyzer is set shows zero decibel value, regulate multi-functional prover frequency output until from the level display window of audio analyzer, reading-the 3dB value, this moment, the frequency of multi-functional prover output was frequency filtering, calibrate each range by calibration point, calculate the pass band filter characteristic error of audio analyzer;
Wherein, described audio signal generator function calibration comprises:
Output voltage error calibration: the output voltage error that uses standard voltmeter calibration audio analyzer, regulate the output of audio analyzer, make by the school instrument and refer on selected voltage calibration point, and the direct actual value that from standard voltmeter, reads these points, the output voltage error of calculating audio analyzer;
Output frequency calibrates for error: the output frequency error of using universal counter calibration audio analyzer, adjusting is by the output of tuner frequency analysis instrument, make by the school instrument and refer on selected frequency calibration point, and the direct actual value that from universal counter, reads these points, the output frequency error of calculating audio analyzer;
Output distortion calibrates for error: the output distortion error of using anamorphoser calibration audio analyzer, regulating audio analyzer makes it be in the sinewave output state, change different Frequency points, directly from anamorphoser, read the distortion value of signal, calculate the output distortion error of audio analyzer;
In the 4th step,, make calibration conclusion to audio analyzer according to each error result.
Preferably, described standard environment condition is: the environmental baseline temperature is 20 ℃, 5 ℃ of permissible variations; Relative humidity is 60%RH, permissible variation 15%RH; Supply voltage is 220V, permissible variation 10%; Supply frequency is 50Hz, permissible variation 1Hz.
Further, carry out that described input voltage calibrates for error, incoming frequency calibrates for error, Frequency Response is calibrated, when the calibration of weighting filter characteristic and pass band filter characteristic calibration, the line connection of multi-functional prover and audio analyzer is, the positive pole of multi-functional prover connects the positive pole of audio analyzer, and the negative pole of multi-functional prover connects the negative pole of audio analyzer.
Further, when carrying out the calibration of described input distortion, the line connection of regulating degree of distortion instrument calibrating installation and audio analyzer is, the positive pole of regulating degree of distortion instrument calibrating installation connects the positive pole of audio analyzer, and the negative pole of regulating degree of distortion instrument calibrating installation connects the negative pole of audio analyzer.
Further, when carrying out the calibration of described output voltage error, the line connection of standard voltmeter and audio analyzer is that the positive pole of standard voltmeter connects the positive pole of audio analyzer, the negative pole of the negative pole connection audio analyzer of standard voltmeter.
Further, carry out described output frequency when calibrating for error, the line connection of universal counter and audio analyzer is, the positive pole of universal counter connects the positive pole of audio analyzer, and the negative pole of universal counter connects the negative pole of audio analyzer.
Further, when carrying out described output distortion and calibrating for error, the line connection of anamorphoser and audio analyzer is, the positive pole of anamorphoser connects the positive pole of audio analyzer, and the negative pole of anamorphoser connects the negative pole of audio analyzer.
Preferably, the maximum tolerance of described multi-functional prover should be less than by 1/3～1/5 of tuner frequency analysis instrument permissible error; The maximum tolerance of degree of distortion instrument calibrating installation should be less than by 1/3～1/5 of tuner frequency analysis instrument permissible error.
Beneficial effect of the present invention: audio analyzer calibration steps of the present invention is, earlier audio analyzer is placed under the standard environment condition and calibrate, then audio analyzer is carried out visual examination, again audio analyzer is carried out the fundamental error calibration, the fundamental error calibration comprises calibration of audio analysis function and the calibration of audio signal generator function, according to each error result, make calibration conclusion at last to audio analyzer.Above operation steps is tight and orderly, and test item is with strong points, has simple operation, the detection efficiency advantage of higher.
Embodiment:
Audio analyzer calibration steps of the present invention, the fundamental error of audio analyzer should be calibrated under following standard environment condition: the environmental baseline temperature is 20 ℃, 5 ℃ of permissible variations; Relative humidity is 60%RH, permissible variation 15%RH; Supply voltage is 220V, permissible variation 10%; Supply frequency is 50Hz, and permissible variation 1Hz can improve accuracy of detection under this environment.Specifically may further comprise the steps:
The first step places audio analyzer under the above-mentioned standard environment condition and to calibrate.
In second step, audio analyzer is carried out visual examination;
Visual examination specifically comprises: audio analyzer must indicate signs such as model, factory number, manufacturer; Audio analyzer should be guaranteed its correct sign that uses, and do not have and can cause and measure wrong and influence the defective of accuracy; Audio analyzer exposes part non-loosening, physical damage etc., and whether incoming line, power lead, earth terminal be complete; Switch, button, knob etc. should be able to normally use.
The 3rd step, audio analyzer is carried out the fundamental error calibration, the fundamental error calibration comprises calibration of audio analysis function and the calibration of audio signal generator function;
General requirement during calibration is to be placed by tuner frequency analysis instrument to be no less than 1 hour under the calibration environment condition, to eliminate thermograde.By operation instructions energising carrying out preheating, check the electrical installation performance; Should be according to by the accuracy of school instrument, its fundamental error of range calibration; Also can only calibrate required part according to customer requirements; When audio analyzer was carried out the fundamental error calibration, each range was got and is no less than 3 check points, also can increase or reduce check point as required; To each calibration point should test twice or more than, get its mean value as test value;
Wherein, described audio analysis function calibration comprises:
Input voltage calibrates for error: the input voltage error of using multi-functional prover calibration audio analyzer, the positive pole that the positive pole of multi-functional prover is connected audio analyzer, the negative pole of multi-functional prover connects the negative pole of audio analyzer, can import the termination matched load according to the requirement of instructions in case of necessity.Regulate the output of multi-functional prover according to check point, regulating audio analyzer makes it be in the measurement level state, the voltage range that makes audio analyzer is at manual state, directly from its voltage display window, read the value of each range measurement point, calibrate each range by calibration point, calculate the input voltage error of audio analyzer;
Incoming frequency calibrates for error: the incoming frequency error of using multi-functional prover calibration audio analyzer, the positive pole that the positive pole of multi-functional prover is connected audio analyzer, the negative pole of multi-functional prover connects the negative pole of audio analyzer, regulate the output frequency of multi-functional prover, direct reading frequency from the frequency display window of audio analyzer, calibrate each range by calibration point, calculate the incoming frequency error of audio analyzer;
Frequency Response calibration: the Frequency Response that uses multi-functional prover calibration audio analyzer, regulate multi-functional prover, its fixed voltage is constant, change its output frequency, directly from the voltage display window of audio analyzer, read voltage, calibrate each range by calibration point, calculate the Frequency Response of audio analyzer;
Input distortion calibration: the input distortion of using degree of distortion instrument calibrating installation calibration audio analyzer, the positive pole that the positive pole of regulating degree of distortion instrument calibrating installation is connected audio analyzer, the negative pole of regulating degree of distortion instrument calibrating installation connects the negative pole of audio analyzer, regulate the output distortion degree of degree of distortion instrument calibrating installation, regulating audio analyzer makes it be in the measurement distortion status, directly from the distortion display window of audio analyzer, read distortion value, calibrate each range by calibration point, calculate the input distortion of audio analyzer;
According to the serviceability of audio analyzer, its filtering performance is divided into two kinds of weighting characteristic and bandpass characteristics.The parameter of wherein weighted filtering performance is more, and commonly used have DIN-Audio weighting, DIN-Noise weighting, CCIR weighting, A weighting, a CCIR/ARM weighting; And the bandpass filtering performance generally is divided into low-pass filtering and high-pass filtering two classes.
Concrete, the filter characteristic calibration, comprise the calibration of weighting filter characteristic: the weighting filter characteristic of using multi-functional prover calibration audio analyzer, the positive pole that the positive pole of multi-functional prover is connected audio analyzer, the negative pole of multi-functional prover connects the negative pole of audio analyzer, regulate the reference frequency point 1kHz (or by specification requirement) that multi-functional prover exports weighting filter to, audio analyzer is set shows zero decibel value, press the multi-functional prover frequency output of calibration point frequency adjustment, directly from the level display window of audio analyzer, read weighted value, calibrate each range by calibration point, calculate the weighting filter characteristic error of audio analyzer;
Concrete, the filter characteristic calibration, also comprise the pass band filter characteristic calibration: the pass band filter characteristic of using multi-functional prover calibration audio analyzer, the positive pole that the positive pole of multi-functional prover is connected audio analyzer, the negative pole of multi-functional prover connects the negative pole of audio analyzer, regulate the intrinsic frequency filtering of multi-functional prover output audio analyser, audio analyzer is set shows zero decibel value, regulate multi-functional prover frequency output until from the level display window of audio analyzer, reading-the 3dB value, this moment, the frequency of multi-functional prover output was frequency filtering, calibrate each range by calibration point, calculate the pass band filter characteristic error of audio analyzer;
Wherein, described audio signal generator function calibration comprises:
Output voltage error calibration: the output voltage error that uses standard voltmeter calibration audio analyzer, the positive pole that the positive pole of standard voltmeter is connected audio analyzer, the negative pole of standard voltmeter connects the output of the negative pole adjusting audio analyzer of audio analyzer, make by the school instrument and refer on selected voltage calibration point, and the direct actual value that from standard voltmeter, reads these points, the output voltage error of calculating audio analyzer;
Output frequency calibrates for error: the output frequency error of using universal counter calibration audio analyzer, the positive pole that the positive pole of universal counter is connected audio analyzer, the negative pole of universal counter connects the negative pole of audio analyzer to be regulated by the output of tuner frequency analysis instrument, make by the school instrument and refer on selected frequency calibration point, and the direct actual value that from universal counter, reads these points, the output frequency error of calculating audio analyzer;
Output distortion calibrates for error: the output distortion error of using anamorphoser calibration audio analyzer, the positive pole that the positive pole of anamorphoser is connected audio analyzer, the negative pole of anamorphoser connects the negative pole of audio analyzer, regulating audio analyzer makes it be in the sinewave output state, change different Frequency points, directly from anamorphoser, read the distortion value of signal, calculate the output distortion error of audio analyzer;
In the 4th step,, make calibration conclusion to audio analyzer according to each error result, be specifically as follows, to calibrate raw data and should charge to the calibration raw readings, preserve, and can be used a computer by the fundamental error of school instrument and handle according to the requirement of quality manual and program file.
Above-mentioned audio analyzer calibration steps, its signal source performance index comprise: frequency range 20Hz is 0.3% of the value of setting to the 100KHz accuracy; The output level scope is to open a way 0.6mV to 6V, and accuracy (open circuit) is 2% of the value of setting; Flatness (1Hz resolution) be ± 0.7% (± 0.06dB).Its analyzer performance index is: distortion fundamental frequency scope is 20Hz～100KHz, indication range be 0.001%～100% (99.99～0dB), accuracy is ± 1dB, 20Hz～20KHz and ± 2dB, 20Hz～100KHz; Input voltage range is 50mV～300V, and residual distortion and noise are better than train value: 80KHzBW:-80dB (0.01%) or 15 μ V down, 20Hz～20KHz, and-65dB (0.056%) or 45 μ V, 50KHz～100KHz; SINAD fundamental frequency scope is 20Hz～100KHz, and indication range is 0～99.99dB, and accuracy is ± 1dB that 20Hz～20KHz reaches ± 2dB, 20～100KHz; Exchange the level full scale and be shown as 300V, 30V, 3V, 0.3V, 30mV, 3mV, 0.3mV, overrange is 33% (except the 300V range), accuracy is ± 2% (50mV～300V, 20Hz～20KHz); The DC level full scale is shown as 300V, and 48V, 16V, 4V, overrange are 33% (except the 300V range), accuracy be reading ± 1%, 600mV～300V; ± 6mV (input voltage is 600mV); The measurement range of frequency measurement is 20Hz～150KHz (20Hz～100KHz, distortion pattern and a SINAD pattern), 5 of resolving powers (it is 0.01Hz that incoming frequency is lower than 100Hz), and accuracy is ± (0.004%+1 word).
Preferably, the model of described multi-functional prover is FLUKE5500A, and the model of degree of distortion instrument calibrating installation is JD-90A.Wherein, the maximum tolerance of multi-functional prover should be less than by 1/3～1/5 of tuner frequency analysis instrument permissible error; The maximum tolerance of degree of distortion instrument calibrating installation should be less than by 1/3～1/5 of tuner frequency analysis instrument permissible error.The expanded uncertainty of calibrating installation (k=2) should be less than by 1/3～1/5 of school instrument permissible error.Used standard should be examined and determine (calibration), and uses in effective period, and standard set-up and other equipment should have good earthing device and sign, to guarantee the reliability and the personal safety of standard.Adopt above-mentioned audio analyzer calibration steps, the time interval of resuming classes of audio analyzer was generally 1 year, according to also being decided through consultation by the time interval of school instrument by user and calibration unit by the importance at the environment for use condition of school instrument, frequency of utilization and use position.Audio analyzer calibration steps of the present invention, it is tight and orderly to have operation steps, test item is with strong points, simple operation, the detection efficiency advantage of higher, can be used as factory and correcting mechanism and make the do operation standard of instrument calibration, be applicable to measuring voltage 0.001～300V, frequency is less than the calibration of the audio analyzer of 200kHz.
The above only is preferred embodiment of the present invention, so all equivalences of doing according to the described structure of patent claim of the present invention, feature and principle change or modify, is included in the patent claim of the present invention.
Claims (8)
1. the audio analyzer calibration steps is characterized in that, it may further comprise the steps:
The first step places audio analyzer under the standard environment condition and to calibrate;
In second step, audio analyzer is carried out visual examination;
The 3rd step, audio analyzer is carried out the fundamental error calibration, the fundamental error calibration comprises calibration of audio analysis function and the calibration of audio signal generator function;
Wherein, described audio analysis function calibration comprises:
Input voltage calibrates for error: the input voltage error of using multi-functional prover calibration audio analyzer, regulate the output of multi-functional prover according to check point, regulating audio analyzer makes it be in the measurement level state, the voltage range that makes audio analyzer is at manual state, directly from its voltage display window, read the value of each range measurement point, calibrate each range by calibration point, calculate the input voltage error of audio analyzer;
Incoming frequency calibrates for error: the incoming frequency error of using multi-functional prover calibration audio analyzer, regulate the output frequency of multi-functional prover, directly reading frequency from the frequency display window of audio analyzer is calibrated each range by calibration point, calculates the incoming frequency error of audio analyzer;
Frequency Response calibration: the Frequency Response that uses multi-functional prover calibration audio analyzer, regulate multi-functional prover, its fixed voltage is constant, change its output frequency, directly from the voltage display window of audio analyzer, read voltage, calibrate each range by calibration point, calculate the Frequency Response of audio analyzer;
Input distortion calibration: the input distortion of using degree of distortion instrument calibrating installation calibration audio analyzer, regulate the output distortion degree of degree of distortion instrument calibrating installation, regulating audio analyzer makes it be in the measurement distortion status, directly from the distortion display window of audio analyzer, read distortion value, calibrate each range by calibration point, calculate the input distortion of audio analyzer;
The filter characteristic calibration, comprise the calibration of weighting filter characteristic: the weighting filter characteristic of using multi-functional prover calibration audio analyzer, regulate the reference frequency point that multi-functional prover exports weighting filter to, audio analyzer is set shows zero decibel value, press the multi-functional prover frequency output of calibration point frequency adjustment, directly from the level display window of audio analyzer, read weighted value, calibrate each range, calculate the weighting filter characteristic error of audio analyzer by calibration point;
The filter characteristic calibration, comprise the pass band filter characteristic calibration: the pass band filter characteristic of using multi-functional prover calibration audio analyzer, regulate the intrinsic frequency filtering of multi-functional prover output audio analyser, audio analyzer is set shows zero decibel value, regulate multi-functional prover frequency output until from the level display window of audio analyzer, reading-the 3dB value, this moment, the frequency of multi-functional prover output was frequency filtering, calibrate each range by calibration point, calculate the pass band filter characteristic error of audio analyzer;
Wherein, described audio signal generator function calibration comprises:
Output voltage error calibration: the output voltage error that uses standard voltmeter calibration audio analyzer, regulate the output of audio analyzer, make by the school instrument and refer on selected voltage calibration point, and the direct actual value that from standard voltmeter, reads these points, the output voltage error of calculating audio analyzer;
Output frequency calibrates for error: the output frequency error of using universal counter calibration audio analyzer, adjusting is by the output of tuner frequency analysis instrument, make by the school instrument and refer on selected frequency calibration point, and the direct actual value that from universal counter, reads these points, the output frequency error of calculating audio analyzer;
Output distortion calibrates for error: the output distortion error of using anamorphoser calibration audio analyzer, regulating audio analyzer makes it be in the sinewave output state, change different Frequency points, directly from anamorphoser, read the distortion value of signal, calculate the output distortion error of audio analyzer;
In the 4th step,, make calibration conclusion to audio analyzer according to each error result.
2. audio analyzer calibration steps according to claim 1 is characterized in that: described standard environment condition is: the environmental baseline temperature is 20 ℃, 5 ℃ of permissible variations; Relative humidity is 60%RH, permissible variation 15%RH; Supply voltage is 220V, permissible variation 10%; Supply frequency is 50Hz, permissible variation 1Hz.
3. audio analyzer calibration steps according to claim 1, it is characterized in that: carry out that described input voltage calibrates for error, incoming frequency calibrates for error, Frequency Response is calibrated, when the calibration of weighting filter characteristic and pass band filter characteristic calibration, the line connection of multi-functional prover and audio analyzer is, the high-pressure side of multi-functional prover connects the high-pressure side of audio analyzer, and the ground end of multi-functional prover connects the ground end of audio analyzer.
4. audio analyzer calibration steps according to claim 3, it is characterized in that: when carrying out the calibration of described input distortion, the line connection of regulating degree of distortion instrument calibrating installation and audio analyzer is, the high-pressure side of regulating degree of distortion instrument calibrating installation connects the high-pressure side of audio analyzer, and the ground end of regulating degree of distortion instrument calibrating installation connects the ground end of audio analyzer.
5. audio analyzer calibration steps according to claim 4, it is characterized in that: when carrying out the calibration of described output voltage error, the line connection of standard voltmeter and audio analyzer is, the high-pressure side of standard voltmeter connects the high-pressure side of audio analyzer, and the ground end of standard voltmeter connects the ground end of audio analyzer.
6. audio analyzer calibration steps according to claim 5, it is characterized in that: carry out described output frequency when calibrating for error, the line connection of universal counter and audio analyzer is, the high-pressure side of universal counter connects the high-pressure side of audio analyzer, and the ground end of universal counter connects the ground end of audio analyzer.
7. audio analyzer calibration steps according to claim 6, it is characterized in that: when carrying out described output distortion and calibrating for error, the line connection of anamorphoser and audio analyzer is, the high-pressure side of anamorphoser connects the high-pressure side of audio analyzer, and the ground end of anamorphoser connects the ground end of audio analyzer.
8. according to each described audio analyzer calibration steps of claim 1 to 7, it is characterized in that: the maximum tolerance of described multi-functional prover should be less than by 1/3～1/5 of tuner frequency analysis instrument permissible error; The maximum tolerance of degree of distortion instrument calibrating installation should be less than by 1/3～1/5 of tuner frequency analysis instrument permissible error.
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| CN105609115A (en) * | 2015-12-18 | 2016-05-25 | 中国电子科技集团公司第四十一研究所 | Audio analyzer and internal self-calibrating method therefor |
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Address after: 523179 Houde Shangliangzhou Industrial Zone, Daojiao Town, Dongguan City, Guangdong Province Patentee after: Guangdong Shitong Instrument Testing Service Co., Ltd. Address before: 523000 Guangdong Dongguan Shitong Instrument Testing Service Co., Ltd. Houde Shangliangzhou Industrial Zone, Daojiao Town, Dongguan City Patentee before: Dongguan City Shitong Measured Instruments Service Co., Ltd. |
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