Extech Instruments 7470 Operation Manual page 9

Service Interval
The instrument, its power cord, test leads, and accessories must be returned at least
once a year to an Extech authorized service center for calibration and inspection of
safety related components. Extech will not be held liable for injuries suffered if the
instrument is not properly maintained and safety checked annually.
User Modifications
Unauthorized user modifications will void your warranty. Extech will not be
responsible for any injuries sustained due to unauthorized equipment modifications or
use of parts not specified by Extech. Instruments returned to Extech with unsafe
modifications will be returned to their original operating condition at the customers
expense.
1.4.2. Test Station
Location
Select an area away from the main stream of activity which employees do not walk
through in performing their normal duties. If this is not practical because of production
line flow, then the area should be roped off and marked for HIGH VOLTAGE TESTING.
No employees other than the test operators should be allowed inside.
If benches are placed back-to-back, be especially careful about the use of the bench
opposite the test station. Signs should be posted: "DANGER – HIGH VOLTAGE
TEST IN PROGRESS – UNAUTHORIZED PERSONNEL KEEP AWAY."
Work Area
Perform the tests on a non-conducting table or workbench, if possible. If you cannot
avoid using a conductive surface, be certain that it is
connected to a good earth ground and the high
voltage connection is insulated from the grounded
surface.
There should not be any metal in the work area
between the operator and the location where products
being tested will be positioned. Any other metal in
the work area should be connected to a good ground,
never left "floating".
Position the tester so the operator does not have to
reach over the product under test to activate or adjust the tester. If the product or
component being tested is small, it may be possible to construct guards or an
enclosure around the device to be tested. Construct the guards of a non-conducting
ESD TESTING
Electrical safety tests
should not be
performed in or around
ESD testing areas.
ESD methods should
not be employed during
electrical safety testing,
as this could cause a
hazardous condition for
equipment and test
operators.
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