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2715 Spectrum Analyzer Service Manual
5-1
Adjustment Procedures
If the instrument performance is not within tolerance for a particular characteris-
tic, determine the cause, repair if necessary, then use the appropriate adjustment
procedure to return the instrument operation to performance specification. After
any adjustment, verify performance by repeating the applicable part of the
Performance Verification procedure.
Allow the instrument to warm up for at least 15 minutes, in an ambient
temperature of 20° Cto30° C before making any adjustments. Waveform
illustrations in the adjustment procedure are typical and may differ from one
instrument to another. These waveforms should not be construed as being
representative of specification tolerances.
Static Discharge Precautions
Static discharge can damage many semiconductor components used in this
instrument.
Many semiconductor components, especially MOS types, can be damaged by
static discharge. Damage may not be catastrophic and, therefore, not immediately
apparent. It usually appears as a degradation of the semiconductor characteristics.
Devices that are particularly susceptible are: MOS, CMOS, JFETs, and high
impedance operational amplifiers (FET input stages.) The damaged parts may
operate within acceptable limits over a short period, but their reliability will have
been severely impaired. Damage can be significantly reduced by observing the
following precautions.
H Handle static sensitive components or circuit assemblies at or on a staticfree
surface. Work station areas should contain a staticfree bench cover or work
plane such as conductive polyethylene sheeting and a grounding wrist strap.
The work plane should be connected to earth ground.
H All test equipment, accessories, and soldering tools should be connected to
earth ground.
H Minimize handling by keeping the components in their original containers
until ready for use. Minimize the removal and installation of semiconductors
from their circuit boards.
H Hold the IC devices by the body rather than the terminals.
H Use containers made of conductive material or filled with conductive
material for storage and transportation. Avoid using ordinary plastic
containers. Any static sensitive part or assembly (circuit board) that is to be
returned to Tektronix, Inc. should be packaged in its original container or
one with antistatic packaging material.