Some standard content:
National Metrology Verification Regulations of the People's Republic of China JJG 979—2003
Bar Code Verifiers
Promulgated on 2003-03-05
Implementation on 2003-06-01
Promulgated by the General Administration of Quality Supervision, Inspection and Quarantine JIG 979—2003
Verification Regulations of
Bar Code Verifiers
JJG 9792003
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on March 5, 2003, and came into effect on June 1, 2003.
Responsible unit: National Technical Committee for Geometry and Length Metrology Drafting unit: National Bar Code Quality Supervision and Inspection Center This regulation is based on the National Technical Committee for Geometry and Length Metrology Responsibility Explanation of this regulation Main drafters of this regulation:
Xiong Wenjian
Wu Hailian
Wang Yingchun
I.IG 579——2003
(National Bar Code Quality Supervision and Inspection Center)
(National Bar Code Quality Supervision and Inspection Center) (National Bar Code Quality Supervision and Inspection Center)
Citations-
3 Terminology
3.1 Standard reflector
1.2 Bar and space width standard
3.3 Bar symbol sample with 3.4 X size
4.1 Application and basic principle
4.2 Grade
Quality performance requirements
Reflectivity indication error
Repeatability of reflectivity
Stability of reflectivity
Indication error of bar width
5.5 Repeatability of bar/space width
5.6 Stability of bar/space width 6. General technical requirements
6.2 Meter performance
6.3 Display and printing
Control of measuring instruments
7.1 Verification conditions
Verification pre-test
7.3 Control method
7.4 Processing of verification results
7.5 Validity period
JJG 979—2003
Appendix Test Certificate! Test Result Notice 1 Inner Page Format Appendix Test Record Format
G9—2003
Test Procedure for Sangma Test Equipment
This procedure is applicable to the initial test and subsequent test of the test instrument for the fixed-level test. 2 References
This procedure is applicable to the following documents:
H1294--18 Commodity Bar Code
H29520 Bar Code Terminology
11129[99] Codba Tea Code
31682915 Inter-20000 Bar Code
IM 1998 General Specifications and Specifications
When using non-standard diameters, attention should be paid to the current valid versions of the referenced documents in the specification. 3 Specifications
3.1 Standard reflective plate
1. A physical object whose reflectivity value is calibrated and used to reproduce the standard reflective value. 3.2 Bar/space standard instrument
1. A physical object whose bar/space width value of a bar code number is calibrated and used to reproduce the bar/space width value.
3.3 Qualified bar code symbol sample
The physical object of the bar code symbol printed in accordance with the relevant bar code standard or technical specification. 3.4 X size
The nominal size of the narrowest bar width in a bar code symbol. 4 Overview
4.1 Purpose and basic principle
The bar code detector is an instrument used to test the quality of bar code symbols. It mainly measures the bar reflectivity and bar width of bar code symbols: the bar reflectivity measurement range is 2%R≤9%; the bar width measurement range is usually 0.127mm, ≤,5.700mm
According to the scanning method, bar code detectors can be divided into two types: displacement scanning type and electric displacement scanning type. The former includes optical type, dynamic mechanical type and micro-light gun type; the latter includes CC1) (coupled device) type. The bar code detector is generally composed of a photoelectric scanner, a length measuring device and a computer, as shown in Figure 1. The light beam emitted by the scanning light source shines on the barcode number, moves through the spaces in turn, and is reflected by the barcode number: the reflected light is projected onto the optical converter through the optical system and converted into a signal. During the scanning process, the reflected light changes with the change of the reflectivity of the barcode, and the size of the corresponding electrical signal changes accordingly. The signal value is proportional to the reflectivity of the barcode: the instrument measures the reflectivity of each barcode according to the value of the scanning electrical signal. When the scanning spot or the center of the sampling area passes through the boundary of the bar and the sampling area, the scanning signal level has a certain characteristic. The calibrator determines the front and rear boundaries of the bar space based on this, and then calculates the displacement from the scanning boundary to the rear boundary according to the counting value of the auxiliary device, so as to measure the value of the bar space width, as shown in Figure 2: Bar code detection can only analyze and judge the measured value according to the provisions of the relevant bar code standards, and give a certain result of the measured bar code symbol. Bar code
and conversion
Photoelectric scanning mode
Precision measurement!
AT) conversion
Figure 1 Bar code detection This is the result of the average figure
Determine the width
Edge quality promotion point
Figure 2 Record two quantities
When detecting the bar code joint, a section is scanned with phosphor light. Scanning path
Scanning distance
CCD barcode detectors are equipped with photoelectric conversion arrays to measure products by electronic scanning, see Figure 3.
4.2 Level
The metering performance of detectors is different. Different usage scenarios have different requirements for the metering performance of barcode detectors. 979—2003
Bar code
Bar code image
-Comparison of electromechanical technology
Creatine meat
Transmission door
Shifting line
Scanning control circuit
Figure 3 (Part of the type inspection plan)
Different: According to the performance requirements, bar code detectors can be divided into A, B, C, D, D, E, F, F, G ... Difference: Maximum allowable error see Table 1 Table 1 Maximum allowable error
Wind speed (mm)
Printed product width [arn]
Film strip control accuracy (mm
5.2 Monochromaticity of reflectivity
Experimental standard deviation of the minimum value of the inverse rate, its maximum allowable value see Table 2, Table 2 Maximum allowable value of the complex
Reflectivity (mm)
Printed product width / width [rnon]
Resonance (mru)
5.3 Stability of reflectivity
JJG 979.--2003
The average change of the reflection value in h, its maximum allowable value is shown in Table 3: Table 3 Maximum allowable value of the displacement quality
Reflection rate (mm)
[Product bar/space width (mm)
Film and space width (mmrn)
5 Tea gap width indication error
The difference between the bar gap width and the corresponding input (agreed) true value. The maximum allowable error is shown in Table 1. 5.5 Relevant factors of gap width
Experimental standard deviation of the bar gap width indication, its maximum allowable value is shown in Table 2.5.6 Stability of gap width
The change of the average value of the bar/space width indication in 11: its maximum allowable value is shown in Table 36 General technical requirements
6.1 Appearance
The name, model, serial number, manufacturer and other marks on the body of the bar code detector should be clean and free of damage, rust, dirt and deformation. The instrument should have a manufacturer's manual and all accessories should be complete. Domestic bar code detectors must have a manufacturing license. 6.2 Computer performance
The computer system of the bar code detector should work normally, stably and reliably. 6.3 Display and printing
The bar code detector should have clean characters, no fusion, garbled characters or wrong codes.
The control package of the measuring instrument includes the initial calibration and subsequent calibration. 7.1 Calibration conditions
7.1.1 Calibration standard wwW.bzxz.Net
7.1.1.1Standard reflector
The working space of the standard reflector is a reflective plane. In order to adapt to the various barcode detectors, a color stripe is printed on the working surface of the standard reflector with high reflectivity, and a color stripe is printed on the working surface of the standard reflector with lower reflectivity to form a stripe/space structure. The width of the stripe/space should not be less than the diameter of the flux diameter of the barcode detector to be tested. Only for the calibration of barcode detectors with point measurement function, the standard reflector can have a stripe/space structure. There are 10 standard reflector plates, and their respective values are shown in Table 4. The reflectivity of the working surface of the standard reflector is used according to the calibration value. The extended uncertainty of the calibration value of the reflectivity of the standard reflector should not be greater than 1.5% (=2): the uncertainty of the reflectivity is not greater than 0.5 bar,
.1.1.2 Bar/space width standard
JJG 979-2803
Table 4 Series values of standard reflector
Working surface reflectivity standard series value/%
2, 1, 20,, 40, 5060, 70, B0, 90
Bar width standard is divided into two forms: reflection type and transmission type. They are used for the verification of the metrological performance of the bar code detector printed bar space width virtual training mode and the film bar space measurement mode. The specifications are divided into 4 types, see Table 5. Bar width standard and bar/space width are used according to the calibration value. Table 5: Specifications of the Space Width Mann Standard
Reflection type
Transmission type
X scale/mm
0.16S, 0.264, 0.330..0.rn
0.165, 0.264, 0.330. 0.660
The calibration accuracy of the reflective bar width standard shall not exceed 3m (point = 2): The bar/space width non-uniformity shall not be greater than 1m:
The calibration accuracy of the transmissive bar/space width standard shall not exceed 1m (= 2); The bar/space width non-uniformity shall not exceed .5m
7.1.2 Environmental conditions
Ambient temperature: 20℃±2%:
Relative humidity: 40%~60℃:
Lighting source: D, simulated body (temperature 5500K~6500K), top light, illuminance 500Ix~1500lNumber Clean room, no corrosive gas. There is no magnetic field, potential source and mechanical vibration that may affect the normal operation of the instrument, and no direct strong light. 7.1.3 Measuring parts
) Before starting the calibration, the instrument under test and the calibration base standard group should be placed in the calibration environment for 2 hours. The instrument under test should be preheated and self-calibrated according to the requirements of the instrument manual. During the calibration, the calibration standard should be placed halfway, and the scanning line should be aligned with the bar code symbol. The measuring point or scanning should be within the working area of the metrological standard. The scanning line should be aligned with the bar code symbol. e) For the same measuring parts, for the automatic scanning test instrument, the standard and the instrument should be placed as required, and their positions should remain unchanged during the measurement process. For the manual scanning test instrument, the bottom should be aligned with the same position or the same scanning of the metrological standard for measurement. 7.2 Calibration items The calibration items for the first calibration and subsequent calibration shall be different. The calibration items include: Appearance and performance; Indication error of reflection rate; Repeatability of reflectivity; Gradual leveling of one point; Indication error of strip/strip width; Weight of strip width layer; Stability of a strip of space; 7.3 Calibration method 7.3.1 Calibration according to relevant foreign standards: JJG 975203. The instrument shall be manufactured in accordance with the requirements of the first standard! The various code-based control and testing products are subject to test and verification, and the specific test data are given. 7.3.2 Comprehensive performance verification
7.3.2.1 Return rate verification
See the standard for testing the launch force. According to the fixed point of the system, based on the academic opinion, the method of selecting the measurement point is to calibrate the instrument: each measurement indication error is:
where: one is the initial indication of the instrument; one is the standard reflectance rate calibration value, and the value at the calibration point is taken as the small value of the instrument's identification error: 1)
only needs to correct the system reading error between the indications, and the instrument should be repeated m times (10) per year on each marked plate, and the average value of the m measurements at each calibration point is taken as the estimate of the systematic error of the point, and then the station value of the system error of the fixed point is used to draw the instrument's measurement curve. Compared with the theoretical recognition curve, the card is effective in the entire test disk pressure range and the test is similar to the theoretical number of the company. If the sound is divided into F segments, a correction value can be used to repair it. When the certificate is used, 7.3.2.2 The reflection case is repeated and the dose rate is estimated to be 0. The standard pool is added for absorption ranking verification: according to the characteristics of the qualified instrument, the single-point measurement book scans the reflection rate. In the relative measurement, the reflection length is several times (in the measured year: 2
Number of times:
Year number:
First generation of the book:
x— The average level of the measurement should be:
7.3.2.3 The total dynamic distance should be the standard of the lead. The root cause is the characteristics of the design, and the selection of the rate point measurement and the measurement method of the rate at this time are to be approved for false detection... () The measurement is important to test some of the false values of the original flat query parts. The meter can be opened and maintained without false values and the measurement conditions are kept unchanged. 6
1.JG4 979—2403
changes, and then the total error of the measurement is calculated by formula (3): A=
7.3.2.2 Bar/space width error measurement
, that is, the product measurement mode uses a reflective bar width analyzer, and the film measurement mode uses a transmission bar width standard instrument for calibration. For instruments that can only measure commodity bars, the standard with a minimum size of 0.165mm is not used. The instrument under test is selected to measure the bar spaces of the code symbol one by one. The instrument that uses the optical measurement method can choose its own method
for each standard instrument (3) measurement port: the width of the space between the marked lines and the bottom of the bar space, when recording, it can be simply recorded as "bar + space": the width of each bar space and the width of the bar space, but the size of the bar space, etc., can be calculated by formula. -
In my text: Sa
the small value of the safety test instrument:
the basic value of the space test instrument is the space measurement value and the standard value of the space measurement value (4)
the special value of the space test instrument is used as the error of the effective instrument through the corresponding item to compensate for the system error: and the correction value should be used to compensate for the system error of the indicated item, and the virtual instrument should be used for each standard measurement cover [product 10]. The average difference of the indications of each space width and the adjacent bar/space width of the film is taken as the corresponding measured system error value, and then the system error is corrected. In the entire measuring range, the system width, space width, and the sum of the adjacent space widths are respectively calculated to determine a suitable correction value. The above values are given in the calibration certificate card. 7.3.2.3 The repeated measurements of bar/space width are given in the calibration certificate card. The reflective type and the receiving type measurement products with an x size of 1.3 mm are used respectively. The bar/space width is inspected through a different standard instrument. The bar code symbol bar width measurement method is selected: under the same measuring conditions, the standard track is used! Repeated measurement: Use the formula (to calculate the experimental standard error of each empty width. The largest error in the standard error is also the weight of the instrument under test. 7.3.3.6 The stability of the product is measured in the mode of tt/tt, and the remote reading mode is respectively 0.330 mm x 1 mm. The remote reading mode and the remote reading mode are selected for calibration of the bar/empty standard. Select the double bar multi-empty measurement method, and repeat the measurement of the standard for 3 times (several times). The measured values are the changes of each bar on the instrument. The first measurement and the second measurement are taken as the initial value for the instrument under test. During the measurement, the instrument under test is kept in the open state, and the measured properties are kept unchanged. After 1, the measurement is repeated. The change of the old calibration part is calculated by the formula (3). You will find the absolute minimum positive change in the training of the calibration part under the space competition. The negative change is the stability of the instrument.
7.4 The processing of the results
is the result of the calibration of the instrument under test (correction is required: the correction of the calibration result! The fifth step is to make concessions, and the level and requirements are not recommended. However, the Taipei requirement is: the level requirement is not recommended.
JJG9792003
All the inspection results are qualified if there are no card items, otherwise it is unqualified: the qualified instruments are not different, all the inspection results are 4, which is 4 level; the inspection results have B items, which are B. The barcode detector that has passed the inspection will be issued with a certificate: the inspection will not issue a verification result notice, and the legal items will be issued.
The format of the inspection certificate and the verification result notice is shown in the Yang record. The format of the verification record is shown in Appendix R,
.5 Verification cycle
The verification cycle of the barcode detector is 1 year: S
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