Key Safety Points To Remember - Extech Instruments 7630 Operation Manual

Never perform a hipot test on energized circuitry or equipment.
The instrument is equipped with a safety ground connection, be sure that this is connected to a
good earth ground.
Always connect the return lead first, regardless of whether the item under test is a sample of
insulating material, a component tested with the high voltage test lead, or a cord-connected
device with a two or three prong plug. The return lead should be connected first for any type
of hipot testing.
Plug in the high voltage test lead only when it is being used. Handle its clip only by the
insulator---never touch the clip directly. Be certain that the operator has control over any
remote test switches connected to the Hipot. Double check the return and high voltage
connections from the Hipot and the Line, Neutral, Ground and Case connections from the
Touch Current tester to be certain that they are proper and secure.
Device Under Test
Never touch the Device Under Test (DUT) or anything connected to it while
WARNING
high voltage is being applied by the hipot.
When testing with DC, always discharge the capacitance of the item under test and anything
the high voltage may have contacted--such as test fixtures--before handling it or disconnecting
the test leads.
HOT STICK probes can be used to discharge any capacitance in the device under test as a
further safety precaution. A hot stick is a non-conducting rod about two feet long with a
metal probe at the end that is connected to a wire. To discharge the device under test, two hot
sticks are required. First, connect both probe wires to a good earth ground. Then touch one
probe tip to the same place that the return lead was connected. While holding the first probe
in place, touch the second probe tip to the same place where the high voltage lead was
connected.

1.3.5 Key Safety Points to Remember

•
Keep unqualified and unauthorized personnel away from the test area.
•
Arrange the test station in a safe and orderly manner.
•
Never touch the product or connections during a test.
•
In case of any problem, turn off the high voltage first.
•
Properly discharge any item tested with DC before touching connections.
6