Precizika Metrology L18B optical linear encoders are able to have the measuring length of up to 3.240 mm, maximum accuracy of ±5 µm to any meter within the measuring length(ML), and grating periods of ±20 µm, ±40 µm(optional). These are commonly used on CNC machines. But also for measuring and quality control equipment. We offer here the 3140mm(ML) measuring length type which is only available in +/- 5 microns per one meter length (+/-5µm) accuracy. We work with the TTL (+5VDC) types, often referred to as RS422. RS422 is a protocol for differential signals that makes for a very reliable signal.

These linear encoders with TTL are compatible with the Delta A2 and A3 servo drivers. Which means this encoder can be connected to the CN5 input on the servo driver, and used for direct positioning. This eliminates any pitch errors in ballscrew, or tooth deviations in rack and pinion systems. This can help to create very accurate machines. Great care must be taken to make sure that there is very little or no backlash, otherwise it's very hard to create a stable PID control loop.

From the same brand, we also offer a simple DRO(Digital Read Out), that can be used with these linear encoders, for simple measurements on manual machines, or in the quality control process. It's a relatively cheap device that is very handy for simple setups.

Component features:

• Measuring Length: 3140mm
• Cable Length: 1000mm (no connector attached)
• Signal Type: TTL (+5V +/-5%, current <120mA) (RS422)
• Resolution: 0.1 micron (after 4-fold dividing in electronics)
• Grating period of ±20 µm
• Interpolation factor: 50
• Maximum operating frequency: 1000khz (when interpolation factor is 50)
• Incremental or absolute: Incremental
• Incremental signals: Differential square-wave U1/U1 and U2/U2
• Reference signal: One Differential square-wave U0/U0 per revolution
• Low logic <0.5V (logic 0)
• High logic >2.4V (logic 1)
• Accuracy: +/- 5 microns per one meter length (+/-5µm)
• Standard Reference marks (RI): 45 mm from both ends of ML
• Required moving force with sealing lips: 3N
• Max. traversing speed:   0.4 m/s (24,000mm/min) (when interpolation factor is 50)                           
• Operating temperature:  0…+50°C
• Storage temperature:  -20…+70°C
• Permissible vibration (40 to 2000 Hz) = 30 m/s²
• Permissible shock (11 ms) = 100 m/s²
• Protection (IEC 529) without compressed air: IP53
• Weight: 3.54kg (0.4kg + 1kg/meter)
• High Quality component Made in the EU (Latvia)
• Part number: L18B-F01-520-S-05-S-01/W
• OPTIONAL: Protection (IEC 529) with compressed air: IP64
• OPTIONAL: Reference marks : One RI at any location, or two or more RI’s separated by distances of n x 50 mm or distance-coded
• OPTIONAL: Longer cables (or extension cables, see our compatible products tab) (MAX 25 meters)
• OPTIONAL: Connector (D-sub,M12,M16,M17,M23 or any other types)