2
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.
HEDS-XXXX
Metal Codewheels
HEDM-XXXX
Film Codewheels
HEDG-XXXX
Glass Codewheels
Parameter
Storage
Symbol
TS
-40°C to +100°C
-40°C to +70°C
-40°C to +100°C
-40°C to +100°C
Temperature
Operating
T
A
-40°C to +100°C
-40°C to +70°C
Temperature
Humidity
non condensing
30,000 RPM
Velocity
30,000 RPM
12,000 RPM
Shaft Axial Play
± 0.25 mm
(± 0.010 in)
± 0.175 mm
(± 0.007 in)
± 0.175 mm
(± 0.007 in)
Shaft Eccentricity
Plus Radial Play
± 0.1 mm
(± 0.004 in) TIR
± 0.04 mm
(± 0.0015 in) TIR
± 0.04 mm
(± 0.0015 in) TIR
Acceleration
250,000 Rad/Sec2
250,000 Rad/Sec2
100,000 Rad/Sec2
Recommended Operating Conditions
HEDS-XXXX
HEDM-XXXX
HEDG-XXXX
Parameter
Metal Codewheels
Film Codewheels
Glass Codewheels
Maximum Count Frequency
100 kHz
200 kHz*
200 kHz
Shaft Perpendicularity
Plus Axial Play
± 0.25 mm
(± 0.010 in)
± 0.175 mm
(± 0.007 in)
± 0.175 mm
(± 0.007 in)
Shaft Eccentricity Plus
Radial Play
± 0.1 mm
(± 0.004 in) TIR
± 0.04 mm
(± 0.0015 in) TIR
± 0.04 mm
(± 0.0015 in) TIR
Note: Agilent 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.