Model

Accuracy grade

Substrate and mounting

Interpolations error

Measuring length

PP 281

± 2 μm

Glass grid plate, 
with full-surface bonding
 

± 12 nm

Measuring range 68x68mm

PP 281 R

Measuring standard

Coefficient of linear expansion

Two-coordinate TITANID phase grating on glass; grating period 8 ?m

αtherm ? 8 · 10–6 K–1

Accuracy grade

±2 ?m

Measuring range

68 mm x 68 mm,

other measuring ranges upon request

Reference marks1)

One reference mark in each axis, 3 mm after beginning of measuring length

Interface

  1 VPP

Signal period

4 ?m

Cutoff frequency –3 dB

≥ 300 kHz

Traversing speed

≤ 72 m/min

Interpolation error

Position noise RMS

±12 nm

2 nm (450 kHz)2)

Electrical connection

0.5 m cable with 15-pin D-sub connector (male); interface electronics in the connector

Cable length

See interface description, but ≤ 30 m (with HEIDENHAIN cable)

Voltage supply

DC 5 V ±0.25 V

Current consumption

< 185 mA per axis

Vibration 55 Hz to 2000 Hz

Shock 11 ms

≤ 80 m/s2 (EN 60 068-2-6)

≤ 100 m/s2 (EN 60 068-2-27)

Operating temperature

0 °C to 50 °C

Mass Scanning head

Grid plate

Connecting cable

Connector

170 g (without cable)

75 g

37 g/m

140 g

1) The reference mark signal deviates in its zero crossovers from the interface specification (see Mounting Instructions)

2) With –3 dB cutoff frequency of the subsequent electronics