Seaward 300 PrimeTest - Manual (Page 46)

PrimeTest 300
Operating Instructions
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11.0 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
Menu (F4) followed by Manual Mode.
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 300 is to be used for this test its
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 300 will
not cancel the
‘probe zero’.
Fit the Appliance mains plug into the EUT outlet.
Connect the Earth Bond lead to the appliance metal