Some standard content:
National Metrology Technical Specification of the People's Republic of China JJF1165—2007
Calibration Specification for SINAD Meters2007 - 02—28 Issued
Implementation on 2007-05-28
The General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China issued JJF 1165--2007
Calibration Specification for SINAD Meters
JJF1165—2007
This specification was approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on February 28, 2007, and came into effect on May 28, 2007.
Responsible unit: National Acoustic Metrology Technical Committee Drafting unit: Guangzhou Metrology and Testing Technology Research Institute Shenzhen Metrology Quality Inspection Research Institute
Guangzhou Boiler and Pressure Vessel Supervision and Inspection Institute
This specification is interpreted by the National Acoustic Metrology Technical Committee. The main drafters of this specification are:
JJF1165-—2007
Jiang Hong (Guangzhou Metrology and Testing Technology Research Institute) Zhou Lunbin (Guangzhou Metrology and Testing Technology Research Institute) Zhang Guoqing (Shenzhen Metrology Quality Inspection Research Institute) Jiao Jian (Shenzhen Shenzhen Metrology and Quality Inspection Institute) Participating drafters:
Zhou Changhua (Guangzhou Metrology and Inspection Technology Institute) Ma Boqun (Guangzhou Boiler and Pressure Vessel Inspection Institute) Li Jia (Shenzhen Metrology and Quality Inspection Institute) 1
References ·
3 Terms and measurement units
3.1 Confidence
5 Metrology characteristics ·
5.1: Confidence indication unit
5.2 Built-in reference modulation signal unit
6 Calibration conditions
6.1 Environmental conditions.．
6.2 Measurement standards and other equipment
7 Calibration items and calibration methods·
7.1 Calibration items
7.2 Calibration methods
8 Expression of calibration results
9 Recalibration time interval…
Appendix A Contents of calibration certificate
Appendix B Recommended format of inner pages of calibration certificate
JJF 1165—2007
Appendix C Example of uncertainty assessment of measurement results.
1 Scope
JJF 1165—2007
Calibration specification for acceptance meters
This specification applies to the calibration of acceptance meters with an audio modulation signal frequency of 1kHz and an acceptance measurement range of 0dB-20dB.
2 References
This specification references the following technical documents:
GB/T3102.7--1993 "Acoustic Quantities and Units" CB/T3947-1996 "Terms and Definitions of Acoustics" JJF100I-1998 "General Metrology Terms and Definitions" JJF1034-2005 "Terms and Definitions of Acoustic Metrology" JJF1059-1999 "Evaluation and Expression of Measurement Uncertainty" When using this specification, attention should be paid to using the current valid versions of the above-mentioned references. 3 Terms and Measurement Units
This specification adopts the relevant terms and definitions in GB/T3947-1996 "Terms and Definitions of Acoustics" and JJF1034-2005 "Terms and Definitions of Acoustic Metrology", and defines SINAID. This specification adopts the units specified in GB/T3102.7-1993 "Quantities and Units of Acoustics". 3.1 SINAD signal to noise and distortion ratio The common logarithm of the ratio of the audio signal received by the wireless communication device to the sum of the noise and harmonic signals multiplied by 20 is the decibel (dB).
SINAD = 20g(
Wherein: SINAD is signal level, dB:
S is fundamental signal level, mV;
N is noise signal level, mV;
D is harmonic signal level, mV.
4 Overview
The signal level meter is mainly used to evaluate the audio signal reception quality of wireless communication products and test the receiving sensitivity. It usually consists of signal level indication and built-in reference modulation signal source. 5 Metering characteristics
5.1 Signal level indication unit
5.1.1 Input level range
JJF1165—2007
The input level range of the signal level meter is generally 50 mV to 20 V. 5.1.2 Signal indication error
The maximum permissible error of the signal indication of the signal meter should generally not exceed ±1d13. 5.2 Built-in reference modulation signal unit
5.2.1 Modulation signal frequency
The modulation signal output frequency is generally 1kHz, and its maximum permissible error should not be greater than ±2%. 5.2.2 Modulation signal levelwwW.bzxz.Net
The modulation signal output level should generally not be less than 1V. 5.2.3 Modulation signal distortion
The harmonic distortion of the modulated signal should generally not exceed 0.05%. Note: The technical requirements of the above parameters are for reference only. If the manufacturer has other regulations, calibration can be carried out according to the technical requirements given by the manufacturer. 6 Calibration conditions
6.1 Environmental conditions
Leakage: (10~30)C;
Relative humidity: (30~90)%.
6.2 Measurement standards and other equipment
6.2.1 Sine signal generator
Frequency range 10 Hz~10kHz, frequency error not exceeding ±0.5%; harmonic distortion of the output signal does not exceed 0.5%, and the amplitude stability during calibration should not exceed ±0.1dB. 6.2.2 AC digital voltmeter
Should have relative level measurement function; at the same time, it should have relative level measurement function between 1U Hz~10 kHz and (0 ~-20)V The maximum allowable error within the measurement range is ±0.5%, and the input impedance should be greater than 1MQ. 6.2.3 Digital frequency meter
Within the audio measurement range, the frequency error should not exceed ±1×10-46.2.4 Distortion meter
Within the operating frequency measurement range, the maximum allowable error is ±10% of the full scale. 7 Calibration items and calibration methods
7.1 Calibration items
See Table 1 for the calibration items of the oscilloscope. The laboratory can select the applicable calibration items in the table according to the customer's requirements. List of calibration items for oscilloscopes
Calibration item name
Appearance inspection
Input level range
Indication error
Technical requirements
Calibration method
7.2 Calibration method
7.2.1 Appearance inspection
JJF 1165—2007
Table 1 (continued)
Calibration project name
Modulation signal frequency
Modulation signal level
Modulation signal sharpness
Technical requirements
Calibration method
The appearance of the calibration meter should not have any mechanical damage that may affect its normal operation; all required accessories are complete, and the input/output ports are firm and reliable.
7.2.2 Input level range
The input level range calibration block diagram of the signal meter is shown in Figure 1: Signal meter
0 output
Input 0
Sine signal
Generator
Figure 1 Input level range calibration block diagram
AC digital
Voltmeter
According to the above figure, connect the output signal of the sine signal generator to the input end of the signal meter, and adjust the output of the signal generator to 1kHz, and then gradually increase the output signal level from small to large, and the input signal level range can be read through the AC digital voltmeter (when it is less than the input level range of the signal meter, the range indicator of the signal meter will not light up; when it exceeds the input level range of the signal meter, the range indicator (OVER) of the signal meter will light up in red). Note: If the input signal level is less than or exceeds the input level range of the signal meter, the signal meter will indicate an incorrect signal reading. 7.2.3 Signal Indication Error
The signal indication error calibration block diagram of the signal indication error of the signal indication meter is shown in Figure 2: Signal indication meter
Input 0
Sine signal
Generator (1)
Figure 2 Signal indication error calibration block diagram
AC digital
Voltmeter
Sine signal
Generator (2)
JJF 1165—2007
Connect the instrument according to the above figure. First adjust the sine signal generator (1) to output a stable signal of 1kHz, and then adjust the signal level to zero. Then adjust the output of the sine signal generator (2) to 3.5kHz, and at the same time make the signal level of the signal meter 0dB. Then adjust the output signal level of the sine signal generator (1) to make the signal level of the signal meter 1dH, 2dB, and 20dB respectively; at the same time, record the dB reading on the AC digital voltmeter, and calculate the signal level error of the signal meter as follows: AS = S.-S
Where: △.S is the signal level error of the signal meter, dB; S. is the signal level error of the signal meter, dB
S is the measured value of the AC digital voltmeter, dB Note: The output impedance of the sine signal generator should not be less than 6000. 7.2.4 Modulation frequency
The signal meter has a built-in reference modulation signal The block diagram of the modulation signal output frequency calibration is shown in Figure 3: Confirmation meter
0 Input ratio
Input 0
Figure 3 Modulation signal coverage calibration method
Frequency meter
Connect the instrument according to the above figure, adjust the confirmation meter to output 1kH modulation signal, read the frequency indication of the digital frequency meter at this time and calculate the modulation signal frequency error of the confirmation meter according to the following formula: × 100%
The relative error of the built-in modulation signal rate of the confirmation meter, %, f—the built-in modulation signal frequency indication of the confirmation meter, Hs; f.——the measured value of the built-in modulation signal frequency of the confirmation meter, Iz. 7.2.5 Modulation signal level
The block diagram of the modulation signal output level calibration of the built-in reference modulation signal unit of the signal meter is shown in Figure 4: Signal meter
Input 0
Current digital
Figure 4 Modulation signal level and distortion calibration method According to the figure, the accuracy
Measurement instrument
Connect the instrument according to the above figure. Adjust the output knob of the signal meter to adjust the output level of the modulation signal to the maximum, and read the voltage indication of the AC digital voltmeter at this time to obtain the maximum output level of the modulation signal of the signal meter. 4
7.2.6 Modulation signal distortion
JJF1165—2007
The block diagram of the modulation signal harmonic distortion calibration of the built-in reference modulation signal unit of the signal meter is shown in Figure 4. Connect the instrument according to Figure 4. Adjust the output knob of the acceptance meter to adjust the modulated signal output level to the maximum, and read the distortion indication of the distortion meter at this time to obtain the modulation signal distortion value of the acceptance meter. 8 Expression of calibration results
After calibration, the acceptance meter should issue a calibration certificate. The calibration certificate should at least include the information contained in Appendix A. The recommended inner page format of the calibration certificate is shown in Appendix B.
9 Recalibration time interval
The recalibration time interval of the acceptance meter shall be determined by the customer according to the actual situation of its use. The recommended recalibration time interval is 1 year.
Appendix A
1. Title: Calibration Certificate;
2. Laboratory name and address:
JJF 1165—2007
Contents of calibration certificate
3. Location of calibration (if calibration is not performed in the laboratory); 4. Certificate or report number, page number and total number of pages; 5. Customer's name and address:
6. The name, manufacturer, model, specification and serial number of the instrument being calibrated; 7. The date of calibration; 8. The name, validity period and technical parameters of the metrological standard used for calibration; 9. The serial number and name of the metrological specification on which the calibration is based; 10. The ambient temperature and humidity during calibration; 11. The measurement uncertainty of the calibration result: 12. The calibration result of the calibration item; 13. The signature of the calibrator, the signature of the verifier and the signature of the approver; 14. The date of issuance of the calibration certificate; 15. The recommendation on the interval between recalibration: 16. The statement that the calibration certificate shall not be partially reproduced without the written approval of the calibration laboratory. 6 Appendix B JIF 1165—2007 The recommended format of the inner page of the calibration certificate is shown in Figure B.1. Calibration results
1. Appearance inspection:
2. Input level range:
3. Signal-to-noise indication error
Signal-to-noise indication value S,/dB
4. Built-in reference modulation signal frequency:
Modulation signal frequency indication value u(Hz)
5. Internal reference modulation signal level [distortion: modulation signal frequency/Hz
Measurement result expanded uncertainty:
Signal-to-noise measured value S./dB
Total page Page
Signal-to-noise indication error AS/dB
Modulation signal frequency measured value(Hz)
Modulation signal level/V
Note: The measurement standard device used must be effectively traceable. Error e (%)
Harmonic distortion of modulated signal/%
Appendix C
JJF 1165—2007
Example of uncertainty assessment of measurement results
The indication of the signal is one of the most important technical indicators for evaluating the metrological characteristics of the signal meter. Therefore, the uncertainty assessment of the measurement results in this specification is analyzed by taking the error of the indication as an example. C.1 Measurement method
The indication of the signal meter is calibrated according to the measurement method listed in this specification: First, adjust the sine signal generator (1) so that it outputs a stable signal of 1kHz and the signal level is; then adjust the output frequency of the sine signal generator (2) to 3.5kIz, and at the same time make the indication of the signal meter 0dB; then adjust the output level of the sine signal generator (1) so that the reading on the AC voltmeter is 12B; at the same time, record the signal reading of the signal meter and compare them to obtain the indication error of the signal meter. C.2 Mathematical model
The mathematical model of the measurement result of the nanometer indication error is: AS - S.- S
Where: S, the nanometer indication value of the AC digital voltmeter, dB; S——the measured value of the AC digital voltmeter, dBC.3 Variance and sensitivity coefficient
According to the formula
(y) - (af/ax, u?(a:)
u?(AS) = c(S)u(S) + c(S)u(S)S.S). It is not related to ST, so its composite estimated variance is u?(4S) = u*(S) + u(S)
wherein the sensitivity coefficients are
c(S) = 1,c(S) --1
C.4 Analysis and calculation of measurement uncertainty components C.4.1 Uncertainty component introduced in the calibration process u(S,)C,4.1.1 Measurement uncertainty component introduced by repeatability of confidence indication u,(S,)(C.1)
Under the same measurement conditions, the confidence indication of the same confidence meter was measured 10 times independently, and the measurement data are shown in Appendix C:
Appendix C
12.1 12.2
The experimental standard deviation is calculated as:
s(x,) -
2(: - )2 0.136(d3)
u,(S,) = s(,) 0. 136(dB)6 Modulation signal distortion
JJF1165—2007
The calibration diagram of the harmonic distortion of the modulation signal of the built-in reference modulation signal unit of the acceptance meter is shown in Figure 4. Connect the instrument according to Figure 4. Adjust the output knob of the acceptance meter to adjust the modulation signal output level to the maximum, and read the distortion indication of the distortion meter at this time to obtain the modulation signal distortion value of the acceptance meter. 8 Expression of calibration results
After calibration, the acceptance meter should be issued with a calibration certificate. The calibration certificate should at least include the information contained in Appendix A. The recommended inner page format of the calibration certificate is shown in Appendix B.
9 Recalibration time interval
The recalibration time interval of the acceptance meter shall be determined by the customer according to the actual situation of its use. The recommended recalibration time interval is 1 year.
Appendix A
1. Title: Calibration Certificate;
2. Laboratory name and address:
JJF 1165—2007
Contents of calibration certificate
3. Location where calibration is performed (if calibration is not performed in the laboratory);4. Certificate or report number, page number and total number of pages;5. Customer's name and address:
6. The name, manufacturer, model, specification and serial number of the instrument being calibrated; 7. The date of calibration; 8. The name, validity period and technical parameters of the metrological standard used for calibration; 9. The serial number and name of the metrological specification on which the calibration is based; 10. The ambient temperature and humidity during calibration; 11. The measurement uncertainty of the calibration result: 12. The calibration result of the calibration item; 13. The signature of the calibrator, the signature of the verifier and the signature of the approver; 14. The date of issuance of the calibration certificate; 15. The recommendation on the interval between recalibration: 16. The statement that the calibration certificate shall not be partially reproduced without the written approval of the calibration laboratory. 6 Appendix B JIF 1165—2007 The recommended format of the inner page of the calibration certificate is shown in Figure B.1. Calibration results
1. Appearance inspection:
2. Input level range:
3. Signal-to-noise indication error
Signal-to-noise indication value S,/dB
4. Built-in reference modulation signal frequency:
Modulation signal frequency indication value u(Hz)
5. Internal reference modulation signal level [distortion: modulation signal frequency/Hz
Measurement result expanded uncertainty:
Signal-to-noise measured value S./dB
Total page Page
Signal-to-noise indication error AS/dB
Modulation signal frequency measured value(Hz)
Modulation signal level/V
Note: The measurement standard device used must be effectively traceable. Error e (%)
Harmonic distortion of modulated signal/%
Appendix C
JJF 1165—2007
Example of uncertainty assessment of measurement results
The indication of the signal is one of the most important technical indicators for evaluating the metrological characteristics of the signal meter. Therefore, the uncertainty assessment of the measurement results in this specification is analyzed by taking the error of the indication as an example. C.1 Measurement method
The indication of the signal meter is calibrated according to the measurement method listed in this specification: First, adjust the sine signal generator (1) so that it outputs a stable signal of 1kHz and the signal level is; then adjust the output frequency of the sine signal generator (2) to 3.5kIz, and at the same time make the indication of the signal meter 0dB; then adjust the output level of the sine signal generator (1) so that the reading on the AC voltmeter is 12B; at the same time, record the signal reading of the signal meter and compare them to obtain the indication error of the signal meter. C.2 Mathematical model
The mathematical model of the measurement result of the nanometer indication error is: AS - S.- S
Where: S, the nanometer indication value of the AC digital voltmeter, dB; S——the measured value of the AC digital voltmeter, dBC.3 Variance and sensitivity coefficient
According to the formula
(y) - (af/ax, u?(a:)
u?(AS) = c(S)u(S) + c(S)u(S)S.S). It is not related to ST, so its composite estimated variance is u?(4S) = u*(S) + u(S)
wherein the sensitivity coefficients are
c(S) = 1,c(S) --1
C.4 Analysis and calculation of measurement uncertainty components C.4.1 Uncertainty component introduced in the calibration process u(S,)C,4.1.1 Measurement uncertainty component introduced by repeatability of confidence indication u,(S,)(C.1)
Under the same measurement conditions, the confidence indication of the same confidence meter was measured 10 times independently, and the measurement data are shown in Appendix C:
Appendix C
12.1 12.2
The experimental standard deviation is calculated as:
s(x,) -
2(: - )2 0.136(d3)
u,(S,) = s(,) 0. 136(dB)6 Modulation signal distortion
JJF1165—2007
The calibration diagram of the harmonic distortion of the modulation signal of the built-in reference modulation signal unit of the acceptance meter is shown in Figure 4. Connect the instrument according to Figure 4. Adjust the output knob of the acceptance meter to adjust the modulation signal output level to the maximum, and read the distortion indication of the distortion meter at this time to obtain the modulation signal distortion value of the acceptance meter. 8 Expression of calibration results
After calibration, the acceptance meter should be issued with a calibration certificate. The calibration certificate should at least include the information contained in Appendix A. The recommended inner page format of the calibration certificate is shown in Appendix B.
9 Recalibration time interval
The recalibration time interval of the acceptance meter shall be determined by the customer according to the actual situation of its use. The recommended recalibration time interval is 1 year.
Appendix A
1. Title: Calibration Certificate;
2. Laboratory name and address:
JJF 1165—2007
Contents of calibration certificate
3. Location where calibration is performed (if calibration is not performed in the laboratory);4. Certificate or report number, page number and total number of pages;5. Customer's name and address:
6. The name, manufacturer, model, specification and serial number of the instrument being calibrated; 7. The date of calibration; 8. The name, validity period and technical parameters of the metrological standard used for calibration; 9. The serial number and name of the metrological specification on which the calibration is based; 10. The ambient temperature and humidity during calibration; 11. The measurement uncertainty of the calibration result: 12. The calibration result of the calibration item; 13. The signature of the calibrator, the signature of the verifier and the signature of the approver; 14. The date of issuance of the calibration certificate; 15. The recommendation on the interval between recalibration: 16. The statement that the calibration certificate shall not be partially reproduced without the written approval of the calibration laboratory. 6 Appendix B JIF 1165—2007 The recommended format of the inner page of the calibration certificate is shown in Figure B.1. Calibration results
1. Appearance inspection:
2. Input level range:
3. Signal-to-noise indication error
Signal-to-noise indication value S,/dB
4. Built-in reference modulation signal frequency:
Modulation signal frequency indication value u(Hz)
5. Internal reference modulation signal level [distortion: modulation signal frequency/Hz
Measurement result expanded uncertainty:
Signal-to-noise measured value S./dB
Total page Page
Signal-to-noise indication error AS/dB
Modulation signal frequency measured value(Hz)
Modulation signal level/V
Note: The measurement standard device used must be effectively traceable. Error e (%)
Harmonic distortion of modulated signal/%
Appendix C
JJF 1165—2007
Example of uncertainty assessment of measurement results
The indication of the signal is one of the most important technical indicators for evaluating the metrological characteristics of the signal meter. Therefore, the uncertainty assessment of the measurement results in this specification is analyzed by taking the error of the indication as an example. C.1 Measurement method
The indication of the signal meter is calibrated according to the measurement method listed in this specification: First, adjust the sine signal generator (1) so that it outputs a stable signal of 1kHz and the signal level is; then adjust the output frequency of the sine signal generator (2) to 3.5kIz, and at the same time make the indication of the signal meter 0dB; then adjust the output level of the sine signal generator (1) so that the reading on the AC voltmeter is 12B; at the same time, record the signal reading of the signal meter and compare them to obtain the indication error of the signal meter. C.2 Mathematical model
The mathematical model of the measurement result of the nanometer indication error is: AS - S.- S
Where: S, the nanometer indication value of the AC digital voltmeter, dB; S——the measured value of the AC digital voltmeter, dBC.3 Variance and sensitivity coefficient
According to the formula
(y) - (af/ax, u?(a:)
u?(AS) = c(S)u(S) + c(S)u(S)S.S). It is not related to ST, so its composite estimated variance is u?(4S) = u*(S) + u(S)
wherein the sensitivity coefficients are
c(S) = 1,c(S) --1
C.4 Analysis and calculation of measurement uncertainty components C.4.1 Uncertainty component introduced in the calibration process u(S,)C,4.1.1 Measurement uncertainty component introduced by repeatability of confidence indication u,(S,)(C.1)
Under the same measurement conditions, the confidence indication of the same confidence meter was measured 10 times independently, and the measurement data are shown in Appendix C:
Appendix C
12.1 12.2
The experimental standard deviation is calculated as:
s(x,) -
2(: - )2 0.136(d3)
u,(S,) = s(,) 0. 136(dB)2 Mathematical model
The mathematical model of the measurement result of the nanometer indication error is: AS - S.- S
Where: S, the nanometer indication value of the AC digital voltmeter, dB; S——the measured value of the AC digital voltmeter, dBC.3 Variance and sensitivity coefficient
According to the formula
(y) - (af/ax, u?(a:)
u?(AS) = c(S)u(S) + c(S)u(S)S. S). It is not related to ST, so its composite estimated variance is u?(4S) = u*(S) + u(S)
wherein the sensitivity coefficients are
c(S) = 1,c(S) --1
C.4 Analysis and calculation of measurement uncertainty components C.4.1 Uncertainty component introduced in the calibration process u(S,)C,4.1.1 Measurement uncertainty component introduced by repeatability of confidence indication u,(S,)(C.1)
Under the same measurement conditions, the confidence indication of the same confidence meter was measured 10 times independently, and the measurement data are shown in Appendix C:
Appendix C
12.1 12.2
The experimental standard deviation is calculated as:
s(x,) -
2(: - )2 0.136(d3)
u,(S,) = s(,) 0. 136(dB)2 Mathematical model
The mathematical model of the measurement result of the nanometer indication error is: AS - S.- S
Where: S, the nanometer indication value of the AC digital voltmeter, dB; S——the measured value of the AC digital voltmeter, dBC.3 Variance and sensitivity coefficient
According to the formula
(y) - (af/ax, u?(a:)
u?(AS) = c(S)u(S) + c(S)u(S)S. S). It is not related to ST, so its composite estimated variance is u?(4S) = u*(S) + u(S)
wherein the sensitivity coefficients are
c(S) = 1,c(S) --1
C.4 Analysis and calculation of measurement uncertainty components C.4.1 Uncertainty component introduced in the calibration process u(S,)C,4.1.1 Measurement uncertainty component introduced by repeatability of confidence indication u,(S,)(C.1)
Under the same measurement conditions, the confidence indication of the same confidence meter was measured 10 times independently, and the measurement data are shown in Appendix C:
Appendix C
12.1 12.2
The experimental standard deviation is calculated as:
s(x,) -
2(: - )2 0.136(d3)
u,(S,) = s(,) 0. 136(dB)
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