Seaward 350 PrimeTest - Manual (Page 53)

PrimeTest 350 Operating Instructions
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11 Manual Test Functions
Once in Manual mode the tester can perform one of
seven tests as described below. The desired test can
be selected by using either the left/right arrow keys or
the menu.
An icon displayed in the top left of the LCD display
identifies the selected test.
11.1 Earth Continuity
Refer to fig. 3.
This test is applicable to Class I equipment
only.
This test will check that the connection between the
earth pin in the mains plug of the appliance and the
metal casing of the appliance is satisfactory and of
sufficiently low resistance.
A DC test current of ±200mA is applied between the
earth pin of the mains supply plug and the earth bond
test lead clip/probe. The worst-case result is shown on
the display.
Press Setup (F3) to set the Test Duration and
Pass/Fail limit. Use the arrow keys to highlight and set.
The pass/fail limit can be calculated whilst in this mode
by pressing Calc (F3). Enter the type and length of
cable and a new limit will be calculated. This can be
overridden by selecting the limit from the list. Press OK
(F4) when complete. Esc (F2) will exit setup mode
without saving changes.
If an Earth Bond lead other than that supplied
with the PrimeTest 350 is to be used for this test
it’s resistance can be ‘nulled’ out by fitting the probe
end into the EUT earth socket and pressing F2. The
icon above will be displayed on the left side of the LCD
to indicate this has taken place. Press F2 again to
cancel.
Note: switching off the PrimeTest 350 will not cancel
the ‘probe zero’