The WMK-21x/31x Scanning Heads with integrated electronics include all of the necessary signal conditioning to deliver the final output signal. They deliver either RS422 TTL square waves (to 0.125um arc length resolution) or industry standard 1VPP sine/cosine (20um arc length period). See pages 27 – 37 for additional information.
These read heads are IP-67 rated and are insensitive to environmental pollution like grease, oil, coolant, dust and dirt.

WMK-215x WMK-21x
Grating pitch: 500 µm 1000 µm
Operating temperature: -10°C … 100°C
Storage temperature: -20°C … 100°C
Protection Class: IP67
Vibration: < 200 m/s² for 55 – 2000 Hz
Shock: < 2000 m/s² for 6 ms
Power supply: 5V ± 5%
Cable: Cable specification see page 72
Output signals: Sine 1Vpp or TTL (RS422); see diagram on page 71

System resolutions

Signal Period 1Vpp:

Resolution TTL:

500µm … ~15µm

125µm … 0,125µm (1)

1000µm … 31,25µm

250µm … 0,25µm (1)

Max Speed

See table on page 68

Suitable measuring scale:


See page 39


See page 39