GENERAL-continued

TM 11-6625-2975-40

2-27. GENERAL. (CONT)

The controller/audio assembly A2 and the rf modulator assembly A3 contain MOS devices that can be

damaged by static voltage. Although most MOS devices contain internal gate protection circuits, good

practice dictates careful handilng of assemblies containing MOS devices and the following precaution

should be observed.

Reenergize or disconnect all power, signal sources, and loads used with the signal generator.

Place the signal generator on grounded conductive work surface.

The repair technician must be grounded through a conductive wrist strap or other device

using a 1 M Ω series resistance to protect the operator. No two objects, including fingers,

workbench, test equipment, and tools shall simultaneously contact an MOS assembly unless,

the objects have first been placed in electrical contact with one another. The electrical contact

shall have a path resistance of 1 M Ω or less, and shall have to be maintained for at least sev-

eral seconds.

Ground any tools, including soldering equipment, that might come in contact with MOS

assemblies.

When MOS assemblies are removed from the signal generator, they should be placed on the

conductive work surface, or in conductive containers. When an MOS assembly is inserted

in or removed from a container, the repair technician should maintain contact with the con-

ductive portion of the container.

When not working on MOS assemblies, wrap disconnected circuit boards in aluminum foil or in

plastic bags that have been coated or impregnated with conductive material.

Do not handle MOS assemblies unnecessarily or remove them from their packages until being

used or tested.

CAUTION

Failure to observe all of the MOS assembly precautions can cause permanent damage to

the MOS device. This damage can cause the device to fail immediately, or at a later date

when exposed to an adverse environment.

NOTE

The acronym MOS for Metal-Oxide-Semiconductor. A MOS structure is a conductor and a

semi-conductor substrate separated by a thin dielectric.

2-46