Zhuhai Easson Measurement Technology Ltd.
Easson Measurement Technology Ltd. Always Committed to Quality, Technology & Innovation
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Mini Mill Dro Kit Metrology DRO Digital Readout Absolute Linear Scale
Easson have seriously invested in the development of absolute linear scales since 2010, after 2 years of hard works, Easson have launched the first three series of absolute linear scale at 2012. On 2014 Easson have completed the development of the absolute linear scales, offering comprehensive choices to our customers.
Advanced Optical Measuring System
The slide carrier of the VS / VA series scales, use a five bearing design and six spring for optical grating linear transducer, make sure the VA scales not effected by installation, the spring can adjust the angle when the operator install not good for the alignment.
The reader head still in the best way fir on the grating glass, the accuracy of VA scale is totally different with the GS or other brand in China mainland.
VA scale has a small PCB inside the 9 PIN connector, the laser compensation data is store inside, with our LCD Digital display unit, the compensation data will directly load the ECF file (compensation file) into the DRO, accuracy up to ±2μm.
Principal of Absolute Linear Scale
The grating scale of absolute linear scale consists of two grating masks, they are Absolute Grating Mask and Incremental Grating Mask respectively. Functions of this two masks are as per follows :
Absolute Grating Mask have different mask pattern over the whole grating glass, it gives low resolution but unique position readings over the whole measurement travel.
Incremental Grating Mask is an identical repeatable mask patterns over the whole grating glass, it gives very stable and high quality electronic signal for signal interpolation to achieve very high accuracy and resolution position readings.
Features and advantages:
1. High Accuracy
2. Convenient to use
| VA10 | VA11 | VA12 | VA13 | VA20 | VA21 | VA22 | VA23 | ||
| Measuring Standard | Glass Scale - Grating period: 20μm (0.02mm) | ||||||||
| Optical Detecting System | Transmissive Infrared System: wave length 880mm | ||||||||
| Slide Carrier System | Vertical five bearings supporting system | ||||||||
| Resolution | 5μm | 1μm | 5μm | 1μm | 5μm | 1μm | 5μm | 1μm | |
| Measurement Travel | 50-1200mm | Every 50mm per length Specification | Not available | ||||||
| 1300-3000mm | Not available | Every 100mm per length Specification | |||||||
| Accuracy | 50-450mm | ±3μm - ±5μm | -- | ||||||
| 500-800mm | ±10μm | ±5μm | ±10μm | ±5μm | -- | ||||
| 1050-2000mm | ±10μm | ±5μm | ±10μm | ±5μm | -- | ||||
| 1300-3000mm | -- | ±10μm/m | |||||||
| Repeatability | 2μm (0.002mm) | ||||||||
| Hystersis | 3μm (0.003mm) | ||||||||
| Protection | IP 53 | ||||||||
| Power supply | DC 5V ± 5% | ||||||||
| Output Signal | TTL | TTL | 422 | 422 | TTL | TTL | 422 | 422 | |
Installation Dimensions
VA10 / VA11 / VA12 / VA13 Series
VA20 / VA21 / VA22 / VA23 Series
Connector interface
Gold-plated pins to avoid poor connection and Anti-corrosion, it has the small PCB inside the connector which allow the VA series Absolute Linear Scale built in the Laser compensation data and directly connect to our LCD DRO, ensure the high measuring accuracy.
DSUB 9PIN
| PIN | TTL | |
| Signal | Cable | |
| 1 | —— | —— |
| 2 | 0V | Orange |
| 3 | —— | —— |
| 4 | GND | GND |
| 5 | —— | —— |
| 6 | A | Yellow |
| 7 | 5V | Red |
| 8 | B | Green |
| 9 | R | Brown |
100% Laser calibration
Each linear encoder are undergone rigorous calibrated by our in-house laser interferometer, and can provide accuracy test reports to ensure product quality and quality traceability.
Accuracy report in QR code
Each linear scale is printed with a QR code, which is convenient for users to view the accuracy report of the factory inspection.