Installation
Subject to Export Control, see Cover Page for details.
2-12
Earth Bonding Tests
Earth bonding tests should be performed using a 25 A (12 V maximum open circuit voltage) DC
source. Tests should be limited to a maximum duration of 5 seconds and have a pass limit of 0.1 Ω
after allowing for the resistance of the supply lead. Exceeding the 5 second test duration can
damage the Test Set. The tests should be carried out between the supply earth and exposed case
metalwork. No attempt should be made to perform the tests on functional earths (e.g., signal
carrying connector shells or screen connections) as this damages the Test Set.
Insulation Tests
A 500 V DC test should be applied between the protective earth connection and combined live and
neutral supply connections while the 3900 AC Power Supply Switch
is in the ON position. To avoid
switching the live and neutral poles on the Test Set, establish the live/neutral links on the appliance
tester or its connector. The test voltage should be applied for 5 seconds before taking the
measurement.
Aeroflex uses reinforced insulation in the construction of the 3900 and, therefore a minimum pass
limit of 7 MΩ should be achieved during this test.
When a DC power adapter is provided with the equipment, the adapter must pass the 7 MΩ test limit.
Aeroflex does not recommend dielectric flash testing during routine safety tests. Most portable
appliance testers use AC for the dielectric strength test which can damage the supply input filter
capacitors.
Record Maintenance
Aeroflex recommends that test results be recorded and reviewed as part of each test inspection.
Significant differences between previous readings and measured values should be investigated.
If any failure is detected during visual inspection or electrical tests, the equipment should be
disabled and evaluated by a qualified service technician.
Safety critical components should only be replaced with comparable parts, using techniques and
procedures recommended by Aeroflex.
The above information is provided for guidance purposes only. Aeroflex designs and manufactures
its products in accordance with International Safety Standards so that when used in accordance with
recommend guidelines, 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.
External Cleaning
The following procedure contains routine instructions for cleaning the outside of the 3900.
● Clean front panel buttons and display face with soft lint-free cloth. If dirt is difficult to
remove, dampen cloth with water and a mild liquid detergent.
● Remove grease, fungus and ground-in dirt from surfaces with soft lint-free cloth dampened
(not soaked) with isopropyl alcohol.
● Remove dust and dirt from connectors with soft-bristled brush.
● Cover connectors, not in use, with suitable dust cover to prevent tarnishing of connector
contacts.
● Clean cables with soft lint-free cloth.
● Paint exposed metal surface to avoid corrosion.
Carry Handle and Bench Support
The Test Set is fitted with a Bail Arm carry handle and bench support. The handle is attached to the
Test Set with hubs that allow full handle rotation with 12 locking positions. To rotate the Bail Arm,
stand the Test Set on the rear feet and pull both handle hubs outward, away from the case assembly.
Rotate the handle and release hubs to lock handle position.
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