
of less than 30 kHz will insure that the third harmonic (90 kHz) can be
measured.)
Considerations for the Derive from Measured Beat-Note Method
This method is more accurate than the + /— DC Peak method but not
as accurate as the single or double sided spur method. The level of the
calibration source and the circuit it replaces must be exactly the same or
the Detector Constant will be in error.
The HP 3048A displays messages that guide you through the manual steps
required for the Beatnote Calibration method.
Since the peak voltage of a sine wave is equal to its slope, the peak voltage
can be used as an approximation of the Phase Detector Constant for
sinusoidal beatnotes. The beatnote can be examined with an oscilloscope
using the HP 11848A AUX MONITOR port. This is helpful to confirm
that the Phase Detector Constant measured by the system is correct.
2-66 Calibr Process: $N w/o PLL
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