HP 3320A Operating And Service Manual page 42

Model 3320A/B PERFORMANCE TESTS Section V
QUARTZ OSCILLATOR
FREQUENCY SYNTHESIZER
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Figure &-3. Spurious.
c. Set the 3320A/B RANGE to 10 MHz, FREQUENCY
to 1O.Ql, and VERN IN/VERN OUT to OUT. Adjust the
3320A/B amplitude for a convenient reference level on the
ac voltmeter.
d. Set the oscilloscope DISPLAY to ALT B Trigger and
adjust for a convenient display of both channels. The
channel A signal will not lock.
e. Set the 3320A/B FREQUENCY to 10.00. Adjust the
frequency of the 5 MHz oscillator until the channel A
display on the oscilloscope is drifting
very
slowly.
f. Ground the Channel B input terminal on the oscillo-
scope and adjust the display for a convenient reference. Set
the input terminal to de.
g. Disconnect Channel B of the oscilloscope from point
A (Figure 5-4) and connect to point B.
h. The oscilloscope display on Channel B should drift
through 0 Vdc when the 3320A/B signal and the reference
oscillator signal are in phase quadrature. The indication on
the ac voltmeter, when the Channel B oscilloscope display
is at 0 Vdc, should be> 40 dB below the reference set in
Step c.
50MHz
OSCILLOSCOPE PLUG IN
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FREQUENCY SYNTHE SIZER
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Figure &-4. Signal to Phase Noise.
5-5