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VITS100 NTSC VITS Inserter Instruction Manual
6–1
Adjustment Procedures
If VITS100 NTSC VITS Inserter performance is not within tolerance for a
particular characteristic, determine the cause, repair if necessary, and then use the
appropriate adjustment procedure to return the instrument operation to perfor-
mance 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 20 minutes in an ambient tempera-
ture of 20° C to 30° C before making any adjustments. Waveform illustrations in
the procedure are typical and may differ from one instrument to another. These
waveforms should not be construed as being representative of specific tolerances.
Static Discharge Precautions
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 may be
severely impaired. Damage can be significantly reduced by observing the
following precautions during performance of the adjustment procedure.
H Handle equipment containing static sensitive components or circuit
assemblies at or on a static free work surface. Work stations should contain a
static free 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 and accessories should be connected to earth ground.
More information about handling static sensitive assemblies and components can
be found in the Maintenance section of this manual.
Recommended Test Equipment
Table 6–1 lists test equipment and fixtures recommended for the adjustment
procedure. The characteristics specified are the minimum required for the checks.
Substitute equipment must meet or exceed these characteristics.