Displacement Follower User’s Manual Version 1.4, April 19, 2004 IM1008
Page 14
4
Output Filter Switch
A three-position switch that selects a low pass R/C filter at the displacement outputs. For the
best signal-to-noise ratio, select the lowest cutoff frequency possible without compromising operation.
5
Target Phase Switch
Allows the system to track either a light-over-dark or a dark-over-light target as seen through
the viewer.
6
Ortho Input
External orthogonal input used to sweep the tracker along the axis perpendicular to both the tracking
and optical axes. When operating, the
Ortho Input
is connected to the horizontal deflection coil. As displacement is
measured on the vertical axis, the horizontal deflection coil, “powered” by the
Ortho Input
, causes a sweep
horizontally or perpendicular to the axis of sampled displacement. A sweep current of any desired wave form or DC
potential may be connected to sweep the tracker. The DC resistance of the ortho coil is 0.6 ohms; a deflection current of
20ma is required for a full-scale sweep.
7
Gain Adjust
A ten-turn precision potentiometer that adjusts the amplitude of the displacement output. This control
calibrates the range of measurement and the output voltage setting the relationship between voltage and displacement.
Consult System Calibration Data Sheet on page 22 for additional information.
8
Displacement Output
Displays a DC-coupled voltage proportional to the position of a vertically displaced target.
Displacement over the full-scale range of measurement would produce ±5.00 volts or a change of 10.00 volts on the
output when properly calibrated with the output gain control.
9
Velocity Output
Displays a DC-coupled voltage proportional to the velocity of a vertically displaced target.
10
Acceleration Output
Displays a DC-coupled voltage proportional to the acceleration of a vertically displaced
target.
11
Acceleration Time Constant Selector
A nine-position rotary switch for establishing the time constant used in
calculating vertical acceleration.
12
Velocity Time Constant Selector
A nine-position rotary switch for establishing the time constant used in
calculating vertical velocity.
13
Meter
Displays the relative position of a vertically tracking target within the measurement range. This meter also
displays light levels when the
Light/Operate
switch is selected to Light Level.
