PASCO ES-9070 COULOMB BALANCE - Manual (Page 18)

Coulomb Balance 012-03760E
14
1
. a. Use the allen wrench to
loosen both set screws
one full turn.
b. Thread the wire in the
direction shown.
c. Do not tighten the screws.
8 . a. Using the torsion wire
clamp and a spring
balance, pull the wire
with a force of
approximately 4
newtons (400 gram
mass).
b. Tighten the thumb-
screw.
5
. a. Carefully lay the torsion
balance on its side.
b. Thread the wire through
the hole in the torsion
knob. It is helpful to hold
the thread against the
small allen wrench,
pushing them through
together, as shown.
allen wrench
4 . Thread the wire
through the washer.
3 . a. Remove the wire retainer by
unscrewing it.
b. Loosen the set screw and
thumbscrew one full turn.
c. Thread the wire in the
direction shown.
d. Retighten the set screw, but
do not tighten the thumb-
screw. The wire must be
able to turn.
Torsion wire
9 . Adjust the height of
the pendulum assem-
bly, then tighten the
set screws with the
allen wrench.
2
. a. Using the allen wrench,
loosen the set screw one
full turn.
b. Loosen the thumbscrew
one full turn.
c. Thread the wire in the
direction shown.
d. Tighten both screws.
6
. Put the lower wire retainer
back in position, sliding the
wire through the slot in the
bottom bracket.
7 . Screw the wire
retainer back in
place.
Figure 9. Replacing the Torsion Wire