INSTALLATION
2-11
3. Insulation tests
A 500 V DC test should be applied between the protective earth connection and combined live and
neutral supply connections with the equipment supply switch in the ‘on’ position. It is advisable
to make the live/neutral link on the appliance tester or its connector to avoid the possibility of
returning the equipment to the user with the live and neutral poles linked with an ad-hoc strap.
The test voltage should be applied for 5 seconds before taking the measurement.
Aeroflex employs reinforced insulation in the construction of its products and hence a minimum
pass limit of 7 M
Ω
should be achieved during this test.
Where a DC power adapter is provided with the equipment, the adapter must pass the 7 M
Ω
test
limit.
We do not recommend dielectric flash testing during routine safety tests. Most portable appliance
testers use AC for the dielectric strength test which can cause damage to the supply input filter
capacitors.
4. Rectification
It is recommended that the results of the above tests are recorded and checked during each repeat
test. Significant differences between the previous readings and measured values should be
investigated.
If any failure is detected during the above visual inspection or tests, the equipment should be
disabled and the fault should be rectified by an experienced Service Engineer who is familiar with
the hazards involved in carrying out such repairs.
Safety critical components should only be replaced with equivalent parts, using techniques and
procedures recommended by Aeroflex.
The above information is provided for guidance only. Aeroflex designs and constructs its
products in accordance with International Safety Standards such that in normal use they represent
no hazard to the operator. Aeroflex reserves the right to amend the above information in the
course of its continuing commitment to product safety.
Battery replacement
The instrument contains a realtime clock which is powered by a lithium battery when the normal
power is removed. Although battery life can extend to five years, this will depend on conditions
of use, e.g. battery life is reduced as the temperature is increased. To avoid loss of data it is
recommended that the battery is replaced every two years.
Replace the battery as follows:
(1) Ensure that the instrument is switched on; this will provide power for the non-volatile
memory while the battery is replaced. If this is not possible. the clock will continue to run for
approximately 30 seconds, whilst the replacement is made.
(2) Using a coin or suitable took. unscrew the battery compartment cover at the rear of the
instrument.
(3) Remove the battery, noting its orientation. Insert the replacement, then replace the battery
compartment cover.
The replacement battery should be SAFT L56 or equivalent. This is a lithium 3.5 V type, rated at
1800 mAH, size AA. If a lithium battery is unobtainable an alkaline battery can be used but it will
have a shorter life. A suitable battery can be obtained from Aeroflex (part number 23711/106).