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9
Remove the top cover of the Model
725 case by squeezing the two tabs
(grooved area located on the bottom
cover) inward while lifting the top
cover. Remove the used battery
carefully by using a pulling-twisting
motion to unsnap the battery from the
connectors on the printed circuit board.
Install a new 9 volt alkaline battery by
supporting the snap connectors on the
printed circuit board with your fingers,
while using a pushing-twisting motion
to fully seat the terminals of the battery
into the snap connectors.
Note:
Use an alkaline battery for longer life.
Pass the monitor’s ground cord
through one of the two exit wire slots
in the bottom half of the case. Align
the rear locking tab on the top cover, to
the tab slot on the bottom cover while
maintaining the ground cord in the
desired wire slot. Rotate the top cover
downward onto the two side locking
tabs of the bottom cover and snap
firmly into place.
Section 8.
Verification Procedure for
the Model 725 Monitor
The Model 725 Wrist Strap Monitor
cannot be recalibrated after the initial
factory calibration. However, the
following steps can be used to
determine if the Model 725 is
operating within its specifications.
Equipment Needed:
Resistance Substitution Box (RSB),
1 Ohm to 45 Megohms ± 1%.
One two conductor cable with
standard 3.5 mm (miniature) phone
plug attached on one end and
appropriate connectors on the other
end to connect to a RSB.
Two single conductor wires with
clip style on one end and
appropriate connectors on the other
end to connect to a RSB.
Note:
Two conductor cables must have an
isolation resistance of >1 Gigohm
between conductors. Two separated
wires may also be used to obtain
higher isolation resistance.
Procedure:
a) Install a new 9 volt battery into the
Model 725.
b) Short the dual conductor ground
clip by attaching to a conductive
metal object such as a coin.
c) Plug the phone jack test cord into
the wrist strap jack on the front of
the monitor and attach the other end
of the cord to the RSB.