Interstate standard GOST 25706-83
"Loupes. Types, main parameters. General technical requirements"
(approved by Decree of the USSR State Standard of April 8, 1993 N 1684)
Magnifiers. Types, basic parameters. General technical requirements
Instead of GOST 7594-75; GOST 8307-72;
GOST 8309-75; GOST 9461-74;
GOST 10513-73; GOST 18504-73
This standard applies to magnifiers for general and industrial use.
1. Types and main parameters
1.1. Depending on the values of the main parameters, the groups of loops indicated in the table are set. 1.
Table 1
Note. The magnification of the magnifying glass when the pupil of the eye is located in the rear focus should be calculated using the formulas:
where 250 is the distance of best vision, mm;
f" - back focal length of the magnifying glass, mm.
Formula (1) - for magnifiers with a focal length of up to 150 mm, formula (2) - for magnifiers with a focal length of more than 150 mm.
1.2. Depending on the purpose, the types of magnifiers indicated in the table are installed. 2.
table 2
| Type | Purpose | Constructive new execution |
Magnifier group | Optical system |
| LP (viewing room) |
For reading, to view details drawings, photographic print kov, small items and etc. |
Folding, with with a pen, tripod |
Small, average, big increase |
Simple single lens, multi-lens corrected Naya |
| LI (measuring) |
For linear and corner measurements |
Framed, having diopter progress and meter- new scale |
Average increase |
Multilens corrected Naya |
| LZ (grain) | To view grains for the purpose definitions its qualities |
Framed | Small increase |
Simple single lens |
| Champions League (hourly) | For applications in sentry and jewelry industrial you |
Small and average increase |
||
| LT (textile) | For definitions quality and density fabrics (numbers threads per 1 cm2) |
In folding frame |
Simple single lens, multi-lens corrected Naya |
|
| LC (for frame viewing) |
To view frames for film-photo film ke |
Framed, having diopter progress and personnel window |
Simple single lens |
1.3. The designation of a magnifying glass must include the type designation, number of lenses, magnification and designation of this standard.
Examples of symbols:
single-lens textile magnifying glass with magnification glass optics:
GOST 25706-83;
three-lens corrected measuring magnifier with plastic optics magnification:
GOST 25706-83
2. General technical requirements
2.1. Magnifiers should be manufactured in accordance with the requirements of this standard and the specifications for magnifiers of a particular type.
2.2. Magnifier lenses must be made of optical glass in accordance with GOST 3514 or optical plastic with a protective coating.
2.3. The cleanliness of the lens surface must comply with the requirements of GOST 11141; The cleanliness class should be selected depending on the diameters of the magnifier lenses in accordance with Table. 3.
Table 3
(Changed edition, Amendment No. 1).
2.4. The image quality must be clear throughout the entire field of view and correspond to the sample approved in the prescribed manner.
2.5. Magnifier lenses must be firmly secured and must not rotate in the frames.
2.6. The surfaces of the frame and body of magnifiers should not have nicks, dents or other defects.
2.7. In folding magnifying glasses, the hinge joint must ensure that the magnifying glass and handle are fixed at any opening angle.
2.8. The design of grain magnifiers must ensure access of light to the object in question.
4. The validity period was lifted according to Protocol No. 3-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 5-6-93)
5. EDITION (July 2003) with Amendment No. 1, approved in May 1988 (IUS 9-88)
This standard applies to magnifiers for general and industrial use.
1. TYPES AND MAIN PARAMETERS
1. TYPES AND MAIN PARAMETERS
1.1. Depending on the values of the main parameters, the groups of loops indicated in Table 1 are installed.
Table 1
Group | Rating range |
|
increase | linear field of view, mm |
|
Low magnification | Up to 5 incl. | |
Medium magnification | St. 5 to 10 incl. | |
High magnification | ||
Note. The magnification of the magnifying glass when the pupil of the eye is located in the rear focus should be calculated using the formulas:
where 250 is the distance of best vision, mm;
- back focal length of the magnifying glass, mm.
Formula (1) - for magnifiers with a focal length of up to 150 mm, formula (2) - for magnifiers with a focal length of more than 150 mm.
1.2. Depending on the purpose, the types of magnifiers listed in Table 2 are installed.
table 2
Purpose | Design | Magnifier group | Optical system |
|
For reading, for viewing details of drawings, photographic prints, small objects, etc. | Folding, with handle, tripod | Low, medium, high magnification | ||
LI (measuring) | For linear and angular measurements | In a frame with a diopter adjustment and a measuring scale | Medium magnification | Multilens corrected |
LZ (grain) | To view grain to determine its quality | Framed | Low magnification | Simple single lens |
Champions League (hourly) | For use in the watch and jewelry industry | Low and medium magnification | ||
LT (textile) | To determine the quality and density of fabric (number of threads per 1 cm) | In a folding frame | Simple single-lens, multi-lens corrected |
|
LC (to view the frame) | To view frames on film | In a frame with diopter adjustment and frame window | Simple single lens |
1.3. The designation of a magnifying glass must include the type designation, number of lenses, magnification and designation of this standard.
Examples of symbols:
single-lens textile magnifier with glass optics 4 magnifications:
LT-1-4GOST 25706-83;
three-lens corrected measuring magnifier with plastic optics 10 magnification:
LIP-3-10GOST 25706-83
2. GENERAL TECHNICAL REQUIREMENTS
2.1. Magnifiers should be manufactured in accordance with the requirements of this standard and the specifications for magnifiers of a particular type.
2.2. Magnifier lenses must be made of optical glass according to GOST 3514 or made of optical plastic with a protective coating.
2.3. The cleanliness of the lens surface must meet the requirements GOST 11141; The cleanliness class should be selected depending on the diameters of the magnifier lenses in accordance with Table 3.
Table 3
Lens diameter, mm |
||
St. 10 "50" | ||
" 50 " 80 " | ||
(Changed edition, Amendment No. 1).
2.4. The image quality must be clear throughout the entire field of view and correspond to the sample approved in the prescribed manner.
2.5. Magnifier lenses must be firmly secured and must not rotate in the frames.
2.6. The surfaces of the frame and body of magnifiers should not have nicks, dents or other defects.
2.7. In folding magnifying glasses, the hinge joint must ensure that the magnifying glass and handle are fixed at any opening angle.
2.8. The design of grain magnifiers must ensure access of light to the object in question.
2.9. The shape, dimensions and markings of magnifiers must comply with the technical specifications for magnifiers of a particular type.
2.10. For magnifiers with optics made of plastic frames, the clamping rings for attaching the lenses must be made of plastic.
2.11. The magnifying glass body, made of metal, must have a durable anti-corrosion coating.
2.12. The following must be marked on the frame of the magnifying glass:
manufacturer's trademark;
magnification magnification.
2.13. Magnifier lenses made of polymer materials should not have gross casting defects. Under-pressing, sagging, yellowing of materials, as well as deposits on the working surfaces of the lens are not allowed.
2.14. During transportation, magnifiers must withstand exposure to ambient temperatures from minus 45 °C to plus 45 °C.
2.15. Magnifying glasses must be resistant to mechanical stress during transportation with an overload of 4g.
2.16. Magnifiers should be manufactured in climatic conditions UHL category 4.2 according to GOST 15150.
2.17. The established full service life of magnifiers with glass optics is 10 years, with plastic optics - 4 years.
(Changed edition, Amendment No. 1).
The text of the document is verified according to:
official publication
M.: IPK Standards Publishing House, 2003
4. The validity period was lifted according to Protocol No. 3-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 5-6-93)
5. EDITION (July 2003) with Amendment No. 1, approved in May 1988 (IUS 9-88)
This standard applies to magnifiers for general and industrial use.
1. TYPES AND MAIN PARAMETERS
1. TYPES AND MAIN PARAMETERS
1.1. Depending on the values of the main parameters, the groups of loops indicated in Table 1 are installed.
Table 1
Group | Rating range |
|
increase | linear field of view, mm |
|
Low magnification | Up to 5 incl. | |
Medium magnification | St. 5 to 10 incl. | |
High magnification | ||
Note. The magnification of the magnifying glass when the pupil of the eye is located in the rear focus should be calculated using the formulas:
where 250 is the distance of best vision, mm;
- back focal length of the magnifying glass, mm.
Formula (1) - for magnifiers with a focal length of up to 150 mm, formula (2) - for magnifiers with a focal length of more than 150 mm.
1.2. Depending on the purpose, the types of magnifiers listed in Table 2 are installed.
table 2
Purpose | Design | Magnifier group | Optical system |
|
For reading, for viewing details of drawings, photographic prints, small objects, etc. | Folding, with handle, tripod | Low, medium, high magnification | ||
LI (measuring) | For linear and angular measurements | In a frame with a diopter adjustment and a measuring scale | Medium magnification | Multilens corrected |
LZ (grain) | To view grain to determine its quality | Framed | Low magnification | Simple single lens |
Champions League (hourly) | For use in the watch and jewelry industry | Low and medium magnification | ||
LT (textile) | To determine the quality and density of fabric (number of threads per 1 cm) | In a folding frame | Simple single-lens, multi-lens corrected |
|
LC (to view the frame) | To view frames on film | In a frame with diopter adjustment and frame window | Simple single lens |
1.3. The designation of a magnifying glass must include the type designation, number of lenses, magnification and designation of this standard.
Examples of symbols:
single-lens textile magnifier with glass optics 4 magnifications:
LT-1-4 GOST 25706-83 ;
three-lens corrected measuring magnifier with plastic optics 10 magnification:
LIP-3-10 GOST 25706-83
2. GENERAL TECHNICAL REQUIREMENTS
2.1. Magnifiers should be manufactured in accordance with the requirements of this standard and the specifications for magnifiers of a particular type.
2.2. Magnifier lenses must be made of optical glass in accordance with GOST 3514 or optical plastic with a protective coating.
2.3. The cleanliness of the lens surface must meet the requirements of GOST 11141; The cleanliness class should be selected depending on the diameters of the magnifier lenses in accordance with Table 3.
Table 3
Lens diameter, mm | ||
Magnifiers with glass optics | Magnifiers with polymer optics |
|
Up to 10 incl. | ||
St. 10 "50" | ||
" 50 " 80 " | ||
(Changed edition, Amendment No. 1).
2.4. The image quality must be clear throughout the entire field of view and correspond to the sample approved in the prescribed manner.
2.5. Magnifier lenses must be firmly secured and must not rotate in the frames.
2.6. The surfaces of the frame and body of magnifiers should not have nicks, dents or other defects.
2.7. In folding magnifying glasses, the hinge joint must ensure that the magnifying glass and handle are fixed at any opening angle.
2.8. The design of grain magnifiers must ensure access of light to the object in question.
2.9. The shape, dimensions and markings of magnifiers must comply with the technical specifications for magnifiers of a particular type.
2.10. For magnifiers with optics made of plastic frames, the clamping rings for attaching the lenses must be made of plastic.
2.11. The magnifying glass body, made of metal, must have a durable anti-corrosion coating.
2.12. The following must be marked on the frame of the magnifying glass:
manufacturer's trademark;
magnification magnification.
2.13. Magnifier lenses made of polymer materials should not have gross casting defects. Under-pressing, sagging, yellowing of materials, as well as deposits on the working surfaces of the lens are not allowed.
2.14. During transportation, magnifiers must withstand exposure to ambient temperatures from minus 45 °C to plus 45 °C.
2.15. Magnifying glasses must be resistant to mechanical stress during transportation with an overload of 4g.
2.16. Magnifiers should be manufactured in climatic conditions UHL category 4.2 according to GOST 15150.
2.17. The established full service life of magnifiers with glass optics is 10 years, with plastic optics - 4 years.
(Changed edition, Amendment No. 1).
The text of the document is verified according to:
official publication
M.: IPK Standards Publishing House, 2003
4. The validity period was lifted according to Protocol No. 3-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 5-6-93)
5. EDITION (July 2003) with Amendment No. 1, approved in May 1988 (IUS 9-88)
This standard applies to magnifiers for general and industrial use.
1. TYPES AND MAIN PARAMETERS
1. TYPES AND MAIN PARAMETERS
1.1. Depending on the values of the main parameters, the groups of loops indicated in Table 1 are installed.
Table 1
Group | Rating range |
|
increase | linear field of view, mm |
|
Low magnification | Up to 5 incl. | |
Medium magnification | St. 5 to 10 incl. | |
High magnification | ||
Note. The magnification of the magnifying glass when the pupil of the eye is located in the rear focus should be calculated using the formulas:
where 250 is the distance of best vision, mm;
- back focal length of the magnifying glass, mm.
Formula (1) - for magnifiers with a focal length of up to 150 mm, formula (2) - for magnifiers with a focal length of more than 150 mm.
1.2. Depending on the purpose, the types of magnifiers listed in Table 2 are installed.
table 2
Purpose | Design | Magnifier group | Optical system |
|
For reading, for viewing details of drawings, photographic prints, small objects, etc. | Folding, with handle, tripod | Low, medium, high magnification | ||
LI (measuring) | For linear and angular measurements | In a frame with a diopter adjustment and a measuring scale | Medium magnification | Multilens corrected |
LZ (grain) | To view grain to determine its quality | Framed | Low magnification | Simple single lens |
Champions League (hourly) | For use in the watch and jewelry industry | Low and medium magnification | ||
LT (textile) | To determine the quality and density of fabric (number of threads per 1 cm) | In a folding frame | Simple single-lens, multi-lens corrected |
|
LC (to view the frame) | To view frames on film | In a frame with diopter adjustment and frame window | Simple single lens |
1.3. The designation of a magnifying glass must include the type designation, number of lenses, magnification and designation of this standard.
Examples of symbols:
single-lens textile magnifier with glass optics 4 magnifications:
LT-1-4 GOST 25706-83 ;
three-lens corrected measuring magnifier with plastic optics 10 magnification:
LIP-3-10 GOST 25706-83
2. GENERAL TECHNICAL REQUIREMENTS
2.1. Magnifiers should be manufactured in accordance with the requirements of this standard and the specifications for magnifiers of a particular type.
2.2. Magnifier lenses must be made of optical glass in accordance with GOST 3514 or optical plastic with a protective coating.
2.3. The cleanliness of the lens surface must meet the requirements of GOST 11141; The cleanliness class should be selected depending on the diameters of the magnifier lenses in accordance with Table 3.
Table 3
Lens diameter, mm | ||
Magnifiers with glass optics | Magnifiers with polymer optics |
|
Up to 10 incl. | ||
St. 10 "50" | ||
" 50 " 80 " | ||
(Changed edition, Amendment No. 1).
2.4. The image quality must be clear throughout the entire field of view and correspond to the sample approved in the prescribed manner.
2.5. Magnifier lenses must be firmly secured and must not rotate in the frames.
2.6. The surfaces of the frame and body of magnifiers should not have nicks, dents or other defects.
2.7. In folding magnifying glasses, the hinge joint must ensure that the magnifying glass and handle are fixed at any opening angle.
2.8. The design of grain magnifiers must ensure access of light to the object in question.
2.9. The shape, dimensions and markings of magnifiers must comply with the technical specifications for magnifiers of a particular type.
2.10. For magnifiers with optics made of plastic frames, the clamping rings for attaching the lenses must be made of plastic.
2.11. The magnifying glass body, made of metal, must have a durable anti-corrosion coating.
2.12. The following must be marked on the frame of the magnifying glass:
manufacturer's trademark;
magnification magnification.
2.13. Magnifier lenses made of polymer materials should not have gross casting defects. Under-pressing, sagging, yellowing of materials, as well as deposits on the working surfaces of the lens are not allowed.
2.14. During transportation, magnifiers must withstand exposure to ambient temperatures from minus 45 °C to plus 45 °C.
2.15. Magnifying glasses must be resistant to mechanical stress during transportation with an overload of 4g.
2.16. Magnifiers should be manufactured in climatic conditions UHL category 4.2 according to GOST 15150.
2.17. The established full service life of magnifiers with glass optics is 10 years, with plastic optics - 4 years.
(Changed edition, Amendment No. 1).
The text of the document is verified according to:
official publication
M.: IPK Standards Publishing House, 2003