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| Standard Incremental Discs Ø27 mm and Masks | 
| Material: | - selected floatglass
- planarity 10 µm/100 x 100 mm
- coefficient of expansion 9 µm/°C/m
- glass thickness 1,0 ±0,1 mm
- mask scribed and broken
- length tolerance ±0,1 mm
- width tolerance ±0,1 mm
- discs are drilled
- diameter tolerance ±0,1 mm
- outbreaks on edges max. 0,1 mm
| | Graduation: | - sputtered chrome on glass
- transmission < 0,3% at 400 - 900 nm
- reflexion > 60% at 400 - 900 nm
- line width ratio 1 : 1
- line tolerance max. ±10%
- graduation accuracy < ±2"
- coaxiality graduation to outside diameter < 0,2 mm (DIN 7184)
| Acceptable defects in the
graduation/reference mark area: | - max. 3 pinholes or dots max. 100 µm up to 1000 PPR
- max. 3 pinholes or dots max 50 µm above 1000 PPR
- minimum distance between two defects 10 mm
- accumulation of several smaller defects may not exceed the permissible area
| | On request: | - other glass types
- other glass dimensions
- antireflective coats
- chamfered discs
| | Impulses: | 4, 9, 10, 15, 20, 25, 30, 40, 50, 60, 90, 100, 120, 125, 150, 160, 180, 200, 235, 250, 300, 314, 318, 360, 400, 500, 600, 625, 635, 720, 900, 1000, 1021, 1024, 1080, 1200, 1250, 1440, 1500, 1800, 2000, 2048, 2500, 3600, 4096, 5000
(other impulses on request) | | | | | Standard Incremental Discs Ø42 mm and Masks | 
| | Material: | - selected floatglass
- planarity 10 µm/100 x 100 mm
- coefficient of expansion 9 µm/°C/m
- glass thickness 1,0 ±0,1 mm
- mask scribed and broken
- length tolerance ±0,1 mm
- width tolerance ±0,1 mm
- discs are drilled
- diameter tolerance ±0,1 mm
- outbreaks on edges max. 0,1 mm
| | Graduation: | - sputtered chrome on glass
- transmission < 0,3% at 400 - 900 nm
- reflexion > 60% at 400 - 900 nm
- line width ratio 1 : 1
- line tolerance max. ±10%
- graduation accuracy < ±2"
- coaxiality graduation to outside diameter < 0,2 mm (DIN 7184)
| | Acceptable defects in the graduation/reference mark area: | - max. 3 pinholes or dots max. 100 µm up to 1000 PPR
- max. 3 pinholes or dots max 50 µm above 1000 PPR
- minimum distance between two defects 10 mm
- accumulation of several smaller defects may not exceed the permissible area
| | On request: | - other glass types
- other glass dimensions
- antireflective coats
- chamfered discs
| | Impulses: | 50, 60, 100, 120, 125, 127, 150, 180, 200, 216, 240, 250, 254, 256, 300, 314, 360, 400, 500, 512, 600, 625, 720, 750, 768, 810, 900, 1000, 1024, 1200, 1250, 1270, 1440, 1500, 1800, 2000, 2048, 2400, 2500, 3000, 3600, 4000, 4096, 5000, 5400, 6000, 6350, 7200, 8192, 9000, 10000
(other impulses on request | | |
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Circular graduations