Precision glass linear scale
RSF Elektronik
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)
