3M 718A Manual de instrucciones - Página 8
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5.4 Test fixture:
Metal plate of at least 5 square
inches area (38.7 cm
Metal stand capable of supporting
718, and holding it one inch (2.54
cm) away from the metal plate,
centered.
Connectors on the plate with which
it can interface with the high voltage
power supply.
Connections on the metal stand with
which it can be connected to
electrical ground.
5.5 Procedure:
5.5.1 Place the 3M™ 718 Static Sensor on
the metal stand. Verify that it is
exactly one inch (2.54 cm) away from
the metal plate, and that its position is
centered relative to the plate.
5.5.2 Connect the stand to ground.
5.5.3 Turn on the 718 Static Sensor and
set it to the 2 kV range.
5.5.4 Ground the plate. Zero the display.
5.5.5 Remove the ground from the plate,
and connect it to the high voltage
power supply. Apply a 1 kV charge
to the plate.
2
) area.
5.5.6 The instrument should now be
reading 1.000. If it is not, remove
the battery door and use a
screwdriver to turn the small screw
located inside the battery
compartment. Use a small
screwdriver to turn the small screw,
located on the front right side of the
instrument. This screw should
adjust the reading on the display.
Once the display has been adjusted
to read 1.000, the low range of the
718 is now calibrated.
5.5.7 Repeat procedures 5.5.2 - 5.5.6 for
the 20 kV range of the meter, using
a test voltage of 5,000 volts.