3
Encoding Characteristics
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.
Encoding characteristics over
recommended operating range
and recommended mounting
Part Number
Description
Symbol
Min.
Typ.
Max.
Units
HEDS-51XX
Cycle Error
Position Error
∆C
∆θ
3
10
5.5
40
°e
min. of arc
HEDS-61XX
HEDM-512X
HEDM-61XX
HEDG-512X
HEDG-612X
Cycle Error
Position Error
∆C
∆θ
3
7
5.5
20
°e
min. of arc
Cycle Error
Position Error
∆C
∆θ
3
4
7.5
40
°e
min. of arc
Cycle Error
Position Error
∆C
∆θ
3
2
7.5
20
°e
min. of arc
Cycle Error
Position Error
∆C
∆θ
3
4
7.5
30
°e
min. of arc
Cycle Error
Position Error
∆C
∆θ
3
2
7.5
15
°e
min. of arc
Reliability
are also important. For example,
consistent, large temperature
swings over the life of the product
will affect the codewheel
depending on the material. The
following reliability table shows
results of lifetests under varying
conditions of temperature and
humidity.
In addition to the absolute
maximum specifications of
codewheels, the environment
characteristics of the application
performance characteristics
Glass Codewheel Tests
Test
Duration
1000 hours
500 hours
500 cycles
500 hours
Number of Parts
Number of Failures
Storage at 100°C
44
10
98
43
0
0
0
0
Rotating at 100°C
Temperature Cycle: -40°C to +100°C
Temperature/Humidity: 85°C/85% R.H.
Film Codewheel Tests
Test
Duration
1000 hours
500 hours
500 cycles
1000 cycles
1000 cycles
500 cycles
Number of Parts
Number of Failures
Storage at 70°C
118
10
66
64
46
50
0
0
0
0
0
0
Rotating at 70°C
Temperature Cycle: -40°C to +70°C
Temperature Cycle: +20°C to +40°C
Temperature Cycle: +20°C to +55°C
Temperature Cycle: +20°C to +70°C