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When the HP 3048A has completed the calibration
procedures, it will lock the loop and begin its noise
measurement. The Out of Lock light on the front panel of
the HP 11848A turns off after the loop has been tested to
verify phase lock.
Sweep-Segments
When the HP 3048A begins measuring noise, it places the
noise graph on its display. As you watch the graph, you will
see the HP 3048A plot its measurement results in frequency
segments.
The HP 3048A measures the noise level across its frequency
offset range by averaging the noise within smaller frequency
segments. This technique enables the HP 3048A to
optimize measurement speed while providing you with the
measurement resolution needed for most test applications.
Out of Lock Detection
Before and after the HP 3048A measures each frequency
segment, the system verifies that its Out of Lock Detector
has not been set. If the detector has been set, the HP 3048A
will alert you by stopping the measurement and placing an
error message in its display. (The Problem Solving sections
included in the Measurement Applications chapters of this
manual will help you interpret the error messages and will
provide you with recommended actions for correcting the
problem and continuing your measurement.)
Getting Started
1-11
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