Attenuator Probe Repair And Replacement; Replacement Of Oscillator And - HP 608E Operating And Service Manual

Model 608E!F
Section V
NEOPRENE
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SCREW
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FIBER SPACER
OSCILLATOR V6
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Figure 5-24. Replacement of Oscillator and Amplifier Tubes
5-74. ATTENUATOR PROBE REPAIR AND
REPLACEMENT.
CAUTION
During removal and replacement of the
probe, extreme care must be exercised.
The probe consists of a cylindrical metal
tube with a series of spring contact fingers
around its periphery at one end. These
fingers can be accidentally bent or twisted.
It should be noted that one or two of the fin-
gers are bent toward the center of the probe
slightly; do not attempt to straighten them,
since these fingers have been bent to assure
clearance between the probe and the end of
the guide slot in the attenuator housing.
It
is of greatest importance to make certain
that the probe is not subjected to shock.
If
subjected to shock, the electrical com-
ponents attached to the end of the probe can
be broken or their positions altered, with a
consequent change in the electrical charac-
teristics of the probe.
5-75. GENERAL. The impedance-matching network
in the output attenuator can be damaged if power from
an external source is applied to the RF OUTPUT con-
nector.
If
electrical components of the output atten-
uator are damaged, repair or replacement is nec-
essary. Damage to the impedance-matching network
may be confirmed by measuring the VSWR of the atten-
uator at the RF OUTPUT connector.
5-29