232 Chapter4
Key Function Descriptions
Key Descriptions
DETECTOR
NEG PEAK Selects the negative-peak detector mode. Used to detect
the negative-peak noise level of a trace.
Front-panel key access: TRACE
DETECTOR
NORMAL Sets the detector to normal mode; this is also the
default mode. In normal mode, the display simulates an
analog display by alternately displaying positive and
negative peaks when the presence of noise is detected,
and displaying positive peaks otherwise.
Front-panel key access:
TRACE
Detector
Mode
Typical Measurement
Positive
Peak
Good for making sure you do not miss any fast signal
peaks. Good for seeing signals that are very close to the
noise floor. Shows a noise floor that is slightly higher than
the actual noise floor.
Negative
Peak
Mostly used for troubleshooting the spectrum analyzer
and not for making measurements. Gives a good
representation of the modulation envelope for an AM
modulated signal.
Normal Used for most normal operation. Good for viewing signals
and the noise floor at the same time. Does not miss any
signal peaks. May display signal peaks with a slight shift
in frequency. (Delayed by one display sample interval,
1/600 of the span.)
Sample Good for making noise measurements. It's a more realistic
representation of noise than normal detection.
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