Kaman KD-2306 - Manual (Page 8)

Kaman Precision Products PART NO: 860512-001
www.kamansensors.com Last Revised: 8/3/2009
8
4.1.1 MIN (Zero) Controls
The Min Controls (Coarse & Fine) set the electrical zero point. This control is also referred to as the
“electrical offset. As illustrated in the diagram below, the Min controls adjust the point at which output
intercepts the x-axis.
ZERO
INITIAL CALIBRATION
ZERO
AFTER CONTROL
ADJUSTMENT
TARGET
DISPLACEMENT
+OUTPUT
-OUTPUT
After calibration, the Zero controls can be used 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 a bipolar output is required.
The Zero controls can be utilized for final positioning of the output after installing the sensor in it a
mechanical fixture. In general, limit the amount of adjustment to tens of milli-volts of output
adjustment to avoid altering the factory calibration.
4.1.2 MID (Gain) Controls
The Mid controls (Coarse & Fine) affect the change in output of a system in volts due to a given
change in displacement. The Gain control sets the sensitivity or scale factor or Volts/mil (or mm).
The diagram shows how the slope of the output curve changes as gain is increased and decreased.
INCREASED GAIN
INITIAL CALIBRATION
DECREASED GAIN +OUTPUT
-OUTP
U
T
4.1.3 MAX (Linearity) Controls
The Coarse and Fine Max controls affect the shape of the system output curve. The closer the output
is to a straight line, the more accurate your measurement readings. When calibrating, adjustment of
the Max controls interacts with the Gain and Zero controls. The Max controls are primarily used to
swing the full-scale endpoint. Due to the effect of the log amp, it will have some effect on the mid and
less effect on the min.