Campbell Scientific CS110 Electric Field Meter - Manual (Page 61)

Appendix D. Servicing the CS110
Motion of Encoder
Base Plate
Encode
Plate
Connector
Locking Plate
r Base
FIGURE D-2. CS110 motor assembly
Referring to Figure D-2, loosen the 2 Philips head screws on the connector
locking plate on the top of the motor assembly. Slowly rotate the encoder base
plate until Index (Control Port # 8) always equals 5 V (5 V = True = Green in
LoggerNet). Tighten down the 2 Philips head screws on the connector locking
plate and verify that Index still equals 5 V. Using flags 1 and 2, move the motor
a step away from and then back to the fully closed position and verify that Index
equals 5 V for the fully closed position.
The CS110Shutter instruction can be used to open, pause and then close the
CS110 shutter to allow visual inspection/verification of proper opened and
closed shutter positions. The following CS110 program can be used to verify
proper opening and closing of the shutter. Stator to shutter overlap exists in the
fully opened and fully closed positions so that slight shutter position variations
do not alter the exposed area to the sense electrode. A fully opened shutter will
display symmetrical stator to shutter overlap, within the 1.8
° stepper motor step
size, on both edges of each of the 4 openings in the stator. No visible gaps
between the stator and shutter blades should be visible on a fully closed shutter.
D-5