Kaman KDM-8200 - Manual (Page 23)

23
Kaman Precision Products
The Equipment
Target
The essential requirement for a proper target is that it be conductive. In addition, nonmagnetic
Material targets offer greater stability and linearity than magnetic targets (in particular, aluminum, copper
and some 300 series stainless steel make ideal targets).
Kaman Precision Products can optimize any Series 8000 system to work with either a magnetic or
nonmagnetic target. You will find it difficult to use a system tuned for nonmagnetic materials
with a magnetic target. With some of the smaller sensors, it is impossible to use a mismatched
target and system without optimization through changing the bridge module.
Target
The size of your target relative to the sensor is very important. The target should be a minimum
Size of 2.5 to 3 times larger than the diameter of an unshielded sensor and 1.5 to 2 times the diameter
of a shielded sensor.
TARGET =
2.5 to 3X diameter of
an unshielded sensor
UNSHIELDED SENSOR
SHIELDED SENSOR
TARGET =
1.5 to 2X diameter of
an shielded sensor
Targets larger than the recommended size will have no effect on system performance. A
flat target that is 3 times the diameter of a sensor face will look the same as one that is 300
times the diameter.
Using a target smaller than the recommended size will cause some degradation in linearity and
long term stability. For smaller targets, calibration over a range less than the specified range for
the sensor will minimize and in some cases, eliminate the performance degradation. (Refer also
to Part 4: CALIBRATION for high accuracy band calibration.)