Document
HEDS-51X0/61X0 Series, HEDG-512X/612X Series HEDM-512X/61XX Series Two and Three Channel Codewheels for use with Avago Technologies Optical Encoder Modules
Data Sheet
Description
Avago Technologies offers a wide variety of codewheels for use with Avago Technologies’ HEDS-9000, HEDS9100, HEDS-9040, and HEDS-9140 series Encoder Modules. Designed for many environments, applications, and budgets, Avago Technologies’ codewheels are available in Glass, Film, and Metal. These codewheels are available in resolutions from 96 Counts Per Revolution (CPR) to 1024 CPR on an 11 mm optical radius and 500 to 2048 CPR on a 23.36 mm optical radius.
Each of the three codewheel materials offers a certain advantage. Metal codewheels are the most versatile, with a temperature rating up to 100°C, resolution to 512 CPR (28 mm diameter), as well as 2 and 3 channel outputs. Film codewheels offer higher resolution (up to 1024 CPR on a 28 mm diameter) with an operating tem perature of 70°C. Glass codewheels combine the best of film and metal, offering a temperature rating of 100°C and resolutions to 1024 CPR on a 28 mm diameter.
In addition, each material offers a specific reliability rating. It is important to consider the specific application operating environment, long term operating conditions, and temperature ranges when choosing a code wheel material.
Also See:
• HEDS-9000/HEDS-9100 Encoder Module Data Sheet
• HEDS-9000/9100/9200 Extended Resolution Encoder Module Data Sheet
• HEDS-9040/9140 Three Channel Encoder Module Data Sheet
• HEDS-9700 Small Encoder Module Data Sheet
Features:
• Codewheels Available in Glass, Film, and Metal • Available in Two Standard Diameters • Cost Effective • Resolutions from 96 CPR to 2048 CPR • For Use with HEDS-90XX/91XX Series Two and Three
Channel Encoders • Lead Free
Absolute Maximum Ratings
It is important to consider the environment in which the codewheels will be used when selecting a codewheel material. In brief, metal codewheels are rugged, but do not offer higher resolution capabilities. Film codewheels allow higher resolution, but cannot endure the same temperatures and high humidity as metal. Glass codewheels offer both high temperature and higher resolution, but are also more expensive. Consider the following rating table when choosing a codewheel material.
Parameter
Symbol
HEDS-XXXX Metal Codewheels
Storage Temperature
TS
-40°C to +100°C
Operating Temperature
TA
-40°C to +100°C
Humidity
Velocity
30,000 RPM
Shaft Axial Play
±0.25 mm (±0.010 in)
Shaft Eccentricity Plus Radial Play
±0.1 mm (±0.004 in) TIR
Acceleration
250,000 Rad/Sec2
HEDM-XXXX Film Codewheels -40°C to +70°C
-40°C to +70°C
non condensing 30,000 RPM ±0.175 mm (±0.007 in) ±0.04 mm (±0.0015 in) TIR 250,000 Rad/Sec2
HEDG-XXXX Glass Codewheels -40°C to +100°C
-40°C to +100°C
12,000 RPM ±0.175 mm (±0.007 in) ±0.04 mm (±0.0015 in) TIR 100,000 Rad/Sec2
Recommended Operating Conditions
Parameter
Maximum Count Frequency
Shaft Perpendicularity Plus Axial Play
Shaft Eccentricity Plus Radial Play
HEDS-XXXX Metal Codewheels
100 kHz
±0.25 mm (±0.010 in)
±0.1 mm (±0.004 in) TIR
HEDM-XXXX Film Codewheels
200 kHz*
±0.175 mm (±0.007 in)
±0.04 mm (±0.0015 in) TIR
HEDG-XXXX Glass Codewheels
200 kHz
±0.175 mm (±0.007 in)
±0.04 mm (±0.0015 in) TIR
Note: Avago Technologies Encoder Modules are guaranteed to 100 kHz, but can operate at higher frequencies. See Encoder Module Data Sheet for specifications and output load recommendations.
*HEDM-6140 is guaranteed to 100 kHz with the HEDS-9040 #T00 module.
Encoding Characteristics
Encoding characteristics over recommended operating range and recommended mounting tolerances unless otherwise specified. Values are for worst error over a full rotation. Please refer to Encoder Module Data Sheet for definitions of Encoding characteristics.
Reliability
In addition to the absolute maximum specifications of codewheels, the environment characteristics of the application are also important. For example, consistent, large temperature swings over the life of the product will affect the codewheel performance characteristics depending on the material. The following reliability table shows results of lifetests under varying conditions of temperature and humidity.
Part Number HEDS-51XX HEDS-61XX HEDM-512X HEDM-61XX HEDG-512X HEDG-612X
Description Cycle Error Position Error Cycle Error Position Error Cycle Error Position Error Cycle Error Position Error Cycle Error Position Error Cycle Error Position Error
Symbol
Min.
Typ.
Max. Units
∆C
3
5.5
°e
∆θ
10
40
min. of arc
∆C
3
5.5
°e
∆θ
7
20
min. of arc
∆C
3
7.5
°e
∆θ
4
40
min. of arc
∆C ∆θ
3
7.5
°e
2
20
min. of arc
∆C
3
7.5
°e
∆θ
4
30
min. of arc
∆C
3
7.5
°e
∆θ
2
15
min. of arc
Glass.