24
Preventive Maintenance
Cleaning
Disconnect the instrument and wipe it with a clean cloth
slightly
damped with soapy water or Isopropyl alcohol (IPA).
Care should be taken near the terminals, IEC power and USB
sockets.
Care of the instrument
The instrument should always be handled with care and not
dropped. Always ensure that the instrument is secured when
being transported to prevent mechanical shock.
Leads
Leads are silicone insulated and perform well in all weather
conditions. Always keep the leads in the clip-on lead pouch
supplied with the instrument.
Regular inspection of leads is recommended to ensure they
are not damaged in any way. Damaged leads could affect
insulation resistance readings and are a safety hazard.
Battery Care
The battery should be charged on a routine basis at an
absolute minimum of once a year. However more frequent
charging, i.e. once per quarter is preferable.
Never attempt to charge the battery below 0 ºC or above
+40 ºC. The battery is charged by connecting line power at the
instrument IEC power socket.
Store the instrument in a cool, dry location to improve battery
life. Storage temperatures below freezing should be avoided.
Replacing the battery
Read and fully understand the warnings on the Li-ion battery in
the Safety Warnings section of this document.
The battery pack contains Lithium-ion cells and should be
replaced when it no longer holds a charge. A new battery is
available as a spare part from Megger.
Genuine Megger
battery packs must be used. Failure to use genuine parts
may affect product safety performance and will invalidate
your warranty.
Danger Electric Shock Hazard
: Removing the lower case to
change the battery exposes the AC supply wiring which will be
at a hazardous voltage if the equipment is connected to the
AC supply.
Replacement involves removal of four screws from the bottom
of the instrument after which the base can be lifted away from
the front panel and internal moulded assembly. Care should
be taken to keep the front panel and moulding assembly
together. The battery pack is housed within a grey moulded
cover secured by four screws.
On no account must the transparent inner case be opened.
Hazardous voltages up to 15 kV will be exposed. No user
serviceable parts are inside. Refer servicing to qualified
service personnel. If there is any damage to the inner
transparent casing or its lid, then confirm that the Central
Rotary Switch is in the OFF position, disconnect the old
battery and DO NOT connect the new one. Refit the bottom
cover and contact Megger Instruments for service.
MIT515, MIT525, MIT1025 battery replacement
instructions:
1. Remove the lid, switch the central rotary switch to OFF.
2. Disconnect the IEC AC power lead and all test leads
before inverting the lower case, resting the front panel
on a soft surface so as not to damage the keypad.
