Agilent Technologies HP 8642A/B Specifiche Pagina 380

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I Voltage Controlled Source Tuning Requirements
Peak Tuning Range (PTR) = Voltage Tuning Range
X VCO Tuning Constant
Min.
PTR = .1 Hz
Max. PTR = 500 kHz (200 MHz with
an RF Analyzer).
Drift Tracking Range = Allowable Drift During
Measurement.
Total Peak-to-Peak Tuning Range of VCO
System Peak Tuning Range (PTR)
Drift Tracking Range = +20% PTR
f
TT"^
">
Capture
Range =
1
±10% PTR '
VCO Source Center Frequency
Description
The tuning that range the HP 3048A actually uses to maintain quadrature
is limited to a fraction of the peak tuning range (PTR) to ensure the
tuning slope is well behaved and the VCO Tuning Constant remains
accurate. After phase lock is established, the system monitors the tuning
voltage required to maintain lock during calibration. If the tuning voltage
exceeds 10% of the peak tuning range during, system calibration, the
HP 3048A stops the procedure and informs the user that the source
needs to be retuned before the measurement can begin. If the tuning
voltage exceeds 20% of the PTR during the measurement, the system again
informs the user and requests the oscillator be retuned or the problem
be otherwise corrected before proceeding with the measurement. These
limits have been found to guarantee good results even for sources with
very wide or complex tuning voltages. (Refer to the PLL Measurement
sections of
Calihr Process
and Instr.
Params
in Chapter 2, Measurement
Definitions, for a description of the system's requirements when making
a PLL measurement.)
7-14 Quick Reference
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