LRS Micro-g LaCoste FG5, Manual, Page: 87 / 149

Adjustment and Maintenance
4
SPHERE GAIN. The derivative term is controlled with the trimpot called
SPHERE DAMPING.
4.5.2.5.Feedforward Sphere Servo
This servo is made with a ramp waveform. The slope of the ramp is given by the
trimpot called RAMP SLOPE. The zero point, which should be at the top of the
drop or throw, is set by the ramp offset
4.6. Superspring Controller
The Superspring electronics comprise a system for locating the Superspring mass
relative to the support housing, a motor-driven mechanical lever system for
raising and lowering the mainspring, and an electromagnetic coil that enhances
the natural frequency of the mainspring by 2000 to 3000 percent.
Inside the Superspring are an SE-3455 infrared LED, a photo detector, and a
sphere signal preamplifier. An infrared beam from the LED shines through an
optical glass sphere attached to the bottom of the Superspring mass, which is
suspended from the end of mainspring. The sphere focuses the beam on the
photo detector. The detector outputs a signal to the preamplifier that indicates
the position of the Superspring mass in relation to the mainspring support
system.
4.6.1.1.SUPERSPRING CONNECTIONS
Name TYPE Destination Name
Front Panel:
SPHERE OUT BNC BNC16 2H
COIL OUT BNC NC
Back Panel:
COMP OUT BNC NC
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