Using Alternative Leads; Charging The Battery - Megger BT51 Guide De L'utilisateur

Operation
7. After testing remove the handspike, turn the
selector switch to 'Off' and disconnect the test leads.
Caution:~ When the instrument is used for measuring an
inductive load, a voltage spike will appear across
the terminals. This occurs when the instrument is
switched between ranges or the test leads are
connected or disconnected. The instrument will
withstand voltage spikes caused when measuring
inductive loads (which include the test leads) of up to
250 mH.

USING ALTERNATIVE LEADS

For any of the C1, C2, P1 and P2 connection, test leads terminated with
bulldog clips or clamp connectors may be used. Single handspikes are
also suitable. Alternative test leads are available from Megger Limited (see
Accessories, page 11).
The testing procedure as given above should be followed. However, it must
be remembered when using fixed current connection, that as soon as the
connections are made and the circuit completed, the test current will flow
unless the selector switch is in the 'Off' position. Therefore, in order to
conserve battery power, it is advisable, whatever type of connections are
used to keep the time for the test as short as possible
With the fixed type of current connection, keep the selector switch in the
'Off' position while the connections are made and until the test is ready to
be performed
10

CHARGING THE BATTERY

If while performing a test the "low battery voltage" warning light
illuminates the batteries must be recharged.
1. Lift the battery charger socket cover to expose
the charger socket.
2. Connect a suitable three-pin plug to the battery
charger mains supply lead. Ensure that the earth wire
in the supply lead is connected so that the instrument
is earthed when charging the battery
3. Plug the lead into the instrument and then into
a convenient mains supply socket and switch on.
4. Allow the battery to charge for 10 hours.
Note ~ The instrument may be used to perform tests during charging,
providing the battery is not completely exhausted and has been allowed
a little time to recover its voltage. The mains supply cannot fulfill the test
current requirements ·without the aid of the battery. In these circumstances
problems in measurement may arise due to mains interference. A longer
charging time must be allowed if battery charging and testing are carried
out simultaneously. The battery will not be damaged by a longer charging
period.
5. After charging, switch off the mains power supply,
remove the charging lead and replace the battery
charger socket cover.