Kaman KDM-8200 - Manual (Page 28)

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Kaman Precision Products
+ OUTPU
T
- OUTPU
T
ZERO
INITIAL CALIBRATION
ZERO
AFTER CONTROL
ADJUSTMENT
TARGET
DISPLACEMENT
+ OUTP
U
T
- OUTP
U
T
INCREASED
GAIN
INITIAL
CALIBRATION
DECREASED
GAIN
TARGET
DISPLACEMENT
Calibration
Zero Control The Zero control lets you set an electrical zero point. As illustrated in the diagram, the Zero
control adjusts the point at which system output intercepts the x-axis.
After calibration, you can use the Zero control to shift system output anywhere from 40-60%
below the x-axis, depending on sensor, sensor mounting and gain. This feature is useful in
applications where you need a +/- deviation from a standard, or when signal conditioning
electronics require a bipolar output, such as with an A/D converter.
The Zero control is particularly useful in “zeroing out” any mechanical offset created when you
move from a simulation to an application fixture. You can also use the Zero control to correct for
the small amount of drift that can occur over a period of time through aging and temperature
change. This slight drift is easily corrected using a master target or dimensional standard and
readjusting the zero shift until the desired output reading is attained.
Gain Control Gain control affects the change in output of a system in volts due to a given change in
displacement. In other words, gain controls the sensitivity of the system output. The diagram
shows how the slope of the output curve changes as gain is increased and decreased.