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Estimate the system's Capture Range (using the
VCO source parameter values entered for this
measurement). If you have doubts as to whether the
VCO Tuning Constant you entered for this measurement
is within a factor of 2 of your VCO's actual Tuning
Constant, refer to Estimating the Tuning Constant in the
Problem Solving section of this chapter before continuing
with this procedure.
Capture
Capture
Range (Hz) =
Range (Hz) =
VCO Tuning Constant (Hz/V) >
10
(Hz/V) x ,
10
( VCO Tuning Range (V)
JX1-
Hz
2. As you observe the beatnote on the HP 3561A in the
frequency domain, reduce the beatnote until it is to
the left of the first major graticule on the screen.
Adjust the beatnote by adjusting the center frequency of
one of the signal sources if possible. If this is not
possible, use the Center Voltage key on the HP 3048A to
adjust the center voltage of the tuning signal being sent
from the Tune Voltage output on the HP 11848A to the
VCO source. (Keep in mind that shifting the center
voltage of the tuning range may reduce the available
tuning range needed for drift tracking during the
measurement.)
Signal Source Applications
3-85
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