|The reel sensor is comprised of two
basic parts: 1.
Linear to rotary unit
2. Transducer or encoder unitOther
units are also available such as the film potentiometer
unit with 4-20ma output.
The resolver transducer unit is
used whenever absolute measurement is required. The
resolver digital output representing the actual position
is retained through power up/down cycles. The resolver
must be geared appropriately so that it turns 1 revolution
or less over the entire linear range of the cable
travel. For example, a linear range of 100 in.:
Gear ratio for the resolver package
Resolution: single resolver =
dual resolver = 262,144
numbers and read out:
in. or 100.000 in.
The incremental pulse encoder
can be used effectively when retained readings are
not necessary between power up/down cycles.
For example, linear range of 100
with 1000 pulses/rev
Counter output for full range
rev x 1000 pulses/rev = 10,000 pulses