JB/T 7903-1999 This standard is equivalent to ISO 5580:1985 "Minimum requirements for viewing lights for industrial radiographic films for non-destructive testing". This standard is a revision of JB/T 7903-95 "Viewing lights for industrial radiographic films". This standard specifies the technical requirements, test methods, packaging, storage, transportation and other minimum requirements for viewing lights for industrial radiographic films. This standard applies to viewing lights for viewing industrial radiographic films. This standard was first issued in 1989 as GB 11226-89 and was adjusted to JB/T 7903-95 on April 14, 1996. JB/T 7903-1999 Viewing lights for industrial radiographic films JB/T7903-1999 Standard download decompression password: www.bzxz.net

ICS17.240
Machinery Industry Standard of the People's Republic of China
JB/T7903-1999
eqvIso5580:1985
Industrial radiographic film viewing lamp
Industrial radiographic illuminators1999-06-28 Issued
National Bureau of Machinery Industry
2000-01-01 Implementation
JB/T7903-1999
This standard is equivalent to ISO5580:1985 "Non-destructive testing-Industrial radiographic film viewing lamp-Minimum requirements". This standard is a revision of JB/T7903-95 "Industrial radiographic film viewing lamp". During the revision, the original standard was edited and the main technical content remained unchanged. This standard replaces JB/T7903-95 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Nondestructive Testing. The responsible drafting unit of this standard: Shanghai Institute of Materials. The main drafters of this standard: Zhou Jiujiu, Chen Jinbao. Scope
Machinery Industry Standard of the People's Republic of China
Industrial radiographic film viewing lamp
Industrialradiographic illuminatorsJB/T7903-1999
eqvISO5580: 1985
Replaces JB/T7903-95
This standard specifies the technical requirements, test methods, packaging, storage and transportation of industrial radiographic film viewing lamps. This standard applies to viewing lamps for observing industrial radiographic films. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest version of the following standards. GB/T 3768—1983
GB/T 3785—1983
GB/T 4793.1—1995
GB/T 13306-1991
GB/T 15464—1995
JB/T9329—1999
JJG188—1989
JJG 221—1989
JJG 346—1994
3. Classification of film viewing lamps
3.1 Classification by appearance
Simple method for determining power level of noise source
Electrical and acoustic performance and test methods of sound level meterSafety requirements for electrical equipment for measurement, control and laboratory
General technical conditions for instrument packaging
Instrument transportation, basic environmental conditions for transportation and storage and test methodsTrial verification procedures for sound level meters
Brightness meter
Surface temperature meter
Can be divided into two types: vertical and horizontal. Vertical film viewing lamps are mainly used to observe large, rectangular or square radiographic films, and horizontal film viewing lamps are mainly used to observe small radiographic films and strip-shaped photographic films. 3.2 Classification by light source
Can be divided into thermal light source and cold light source viewing lamps. 4 Technical requirements
4.1 Main components of film viewing lamp
a) Observation screen;
b) Housing;
c) Device for adjusting brightness;
d) Heat dissipation device:
e) Necessary accessories, such as shading plate, etc.
Approved by the State Bureau of Machinery Industry on 1999-06-28 and implemented on 2000-01-01
4.2 Observation screen
4.2.1 Materials
JB/T7903—1999
The observation screen shall be made of materials with the following properties: a) It shall have the property of scattering light;
b) It shall not change color or deform when heated;
e) The surface shall not be easily scratched, nor shall it scratch photographic film, and shall be easy to clean. 4.2.2 Brightness
The film viewing lamp shall have a device for selecting the brightness according to the blackness of the film. The minimum brightness requirements of the film viewing lamp are shown in Table 1. Table 1
100000
300000
The brightness of the radiographic film shall not be less than 30cd/m when the film blackness is 2.5; it shall not be less than 10cd/m when the film blackness is >2.5.
4.2.3 Scattering coefficient 0
The scattering coefficient of the light on the viewing screen should be greater than 0.7. 4.2.4 Uniformity coefficient g
Each part of the viewing screen should be evenly illuminated, and the uniformity coefficient should be greater than 0.5. 4.2.5 Interference light
The interference light of the film viewing should not be affected by the shell, ventilation holes (grooves) and shading plate structure. 4.3 Shading device
In order to observe the local area of ​​the photographic film or the radiographic film smaller than the viewing screen, each film viewing lamp should have a set of shading plates to prevent the viewer from being exposed to excess strong light. 4.4 Shell
After the film viewing lamp has been working for 1 hour, the temperature of the surface that the shell often contacts should not exceed 60℃ (when the ambient temperature is 20℃, the connection and disconnection should each occupy half of the time, and the longest connection time of the surface is 15s). 4.5·Noise
The whole machine noise of the film viewing lamp during operation should not exceed 40dB. 2
4.6Insulation
JB/T 7903—1999
To ensure human safety, the electrical safety requirements of the film viewing lamp should comply with the provisions of GB/T4793.1. a) In the insulation resistance test, the insulation resistance should not be less than 2M0. b) In the voltage test, there should be no arcing or breakdown. 5Test method
5.1Test equipment
The equipment used in the test must hold a valid certificate issued by the national metrology unit and meet the following requirements: a) The brightness meter used to measure optical parameters should comply with the requirements of JJG221; b) The surface thermometer used to measure the shell temperature should comply with the requirements of JJG346; c) The sound level meter used to measure the whole machine noise should comply with the requirements of JJG188\. 5.2 Test measurements
5.2.1 Measurement of optical parameters
All photometric measurements are carried out in a dark room. The illumination photometer must be placed in the center of the measurement range, and even when the viewing screen is completely covered, the light leaking from the film viewing lamp should not affect the measurement. 5.2.1.1 Measurement of scattering coefficient
The brightness should be measured on a semicircle, the center of the semicircle is the center of the viewing screen, and the diameter of the semicircle is approximately the maximum size of the viewing screen. The diameter is at least 50 cm. The brightness is measured with the help of an appropriate brightness meter, the photosensitive surface of the brightness meter should be tangent to the arc of the semicircle (see Figure 1).
When measuring the brightness, it must be 45° (Ls), 20° (L) and 5° (L,) to the normal of the viewing screen. The scattering coefficient is calculated according to formula (1): Las + Lo
The measurement must be carried out in both positive and negative rotation directions. 5.2.1.2 Measurement of uniformity coefficient
The uniformity of illumination shall be measured with the aid of a luminance meter or other suitable instrument. If the viewing screen is rectangular, divide the viewing screen into several squares, each side of which is 3.5 cm long, and measure the brightness of each square separately. If the viewing screen is circular, the same basic method as 3
JB/T7903-1999
may be followed. In both cases, the square in the middle shall be aligned with the center of the viewing screen. Find the four maximum brightness values ​​and the four minimum brightness values, and calculate the arithmetic mean of the brightness of L and L. The uniformity coefficient g shall be calculated according to formula (2):
(2)
5.2.2 Measurement of shell temperature
5.2.2.1 When the ambient temperature is 20°C, the on and off times are each half, and the longest on time is 15s. After continuous operation for 1h, the temperature shall not exceed 60°C.
5.2.2.2 Under the temperature conditions of 5.2.2.1, use a radiographic film with a blackness of 2 to continuously observe for 1 minute. The film should not curl. 5.2.3 Noise measurement
The test instrument shall use the type 3 instrument specified in GB/T3785. The measurement shall be carried out in accordance with the provisions of GB/T3768. 5.2.4 Insulation performance measurement
The insulation resistance test and voltage test methods specified in GB/T4793.1 shall be followed. 6
Inspection rules
Delivery inspection
Delivery inspection shall be carried out in accordance with Table 2.
Inspection items
Diffused brightness
Evacuation coefficient
Average coefficient
Insulation performance
Sound of the whole machine
Surface humidity of the shell
6.2 Qualification judgment
Test method
According to 5.2.1.2
According to 5.2.1.1
According to 5.2.1.2
a) Insulation test
b) Voltage test
According to Table 1
Not less than 2M0
No overshoot or breakdown
Not more than 40dB
Not more than 60℃
Inspection ratio
30%~50%
30%~50%
20%~30%bzxz.net
20%-30%
6.2.1 According to the number of items 1 and 4 in Table 2, 1% of the number of samples does not meet the specified indicators and is judged as unqualified. 6.2.2 According to the number of items 2, 3, and 6 in Table 2, 5% of the number of samples does not meet the specified indicators and is judged as unqualified. 6.2.3 If 20% of the number of samples sampled from No. 5 in Table 2 does not meet the specified indicators, it is considered unqualified. 7 Marking, packaging, transportation and storage
7.1 Marking
Product marking shall comply with the requirements of GB/T13306 for product labels, and the following contents shall be listed: a) Maximum brightness:
b) Rated main frequency or allowable frequency range: c) Rated power loss:
d) Rated operating voltage or allowable voltage range. 7.2 Packaging
Product packaging shall comply with the requirements of GB/T15464. 7.3 Transportation and storage
JB/T·7903-1999
Product transportation and storage shall comply with the requirements of JB/T9329.
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