Advertisement
2.2.8 HIGH VOLTAGE SOCKET
This unique safety socket has an interlock which prevents accidental
disconnection of the HV gun probe lead.
3. INSTRUCTIONS FOR USE
3.1 PRELIMINARY PROCEDURE
NOTE: OBSERVE ALL SAFETY RULES AT ALL TIMES.
3.1.1
The tester can be powered from 115 or 230V +15% 50/60Hz. Ensure that the
power source available is compatible with the voltage setting on the tester.
To change the setting, remove the fuse drawer using a small screwdriver
and pull out the fuse holder. Fit a 5 x 20mm 0.25A type HBC fuse for 230
volt operation or a 0.5A of the same type for 115 volt operation. Insert the
fuse holder so that the desired voltage shows in the drawer window, then
replace the drawer.
NOTE: If the voltage selector is not set correctly then the tester may be
damaged.
Connect the mains lead to the power inlet and plug it into a suitable power
outlet. If the neon to the right of the inlet socket lights, reverse the plug in
the socket
3.1.2
Select the mode of operation; either breakdown, trip or burn.
When this mode is selected the trip circuit responds to
Breakdown:-
high frequency currents produced by arcing faults only.
Note: If there is a short on the "DUT" there will be no
indication on the displays and the trip mode should be
selected.
NOTE: Leakage currents are not displayed when the break down mode is
selected.
-6-
Trip:-
In the trip mode, mains frequency currents associated
with leakage and short circuits and high frequency
arcing currents that are produced by breakdown are
detected. Set the trip level to the required current by
adjusting the control potentiometer.
In this mode the tester will not trip regardless of any
Burn:-
failure mode in the "DUT". Current will continue to
flow allowing faults to be traced by observing the
resulting arcing.
3.2 PERFORMING A TEST
3.2.1 Attach the spade connector of the earth lead to the earth terminal
( ) on the tester and the crocodile clip to the earth (reference) point
of the "DUT".
3.2.2 Insert the HV gun probe into the HV socket and select 2kV or
4kV output voltage as required.
3.2.3 Set the voltage control fully anti-clockwise to reset and switch
on the tester. The 'kV ON' lamp will illuminate indicating that the
high voltage circuit is energised.
3.2.4 Touch the HV gun probe onto the test point of the "DUT" and
slowly rotate the voltage control clockwise until the value indicated
on the display reaches the recommended test voltage for the"DUT".
3.2.5 Maintain this voltage for the desired length of time. If, during
this test period, the voltage is steady and the failure indicators do not
energise (fail lamp and buzzer) then the "DUT" has passed its test.
The recommended test time is 1 minute according to BSEN 61010.
3.2.6 A failure of the "DUT" will result in the fail lamp illuminating
and the buzzer sounding. The 'kV ON' lamp will extinguish but the
voltage and leakage current at the instant of failure will by held on the
displays. Measurements can then be recorded accurately for each item
tested.
-7-
Advertisement
