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TRACE MODES
TRACE MODES
Four mutually exclusive functions or modes for trace A and trace B determine the manner in which the traces are
displayed. Indicator lights by the keys show the current modes.
WRITE Modes (sweeping):
Displays the input signal response in trace selected.
Displays and holds th e maximum responses of the input signal in trace selected.
STORE Modes (not sweeping):
Stores the current trace and displays it on the CRT display.
Stores the current trace and blanks it from the CRT display.
Trace Memory
An understanding of the TRACE modes requires a description of the trace memory and trace data transfer within
the analyzer.
Display traces are not written onto the CRT directly from the spectrum analyzer's IF section. Instead, the analog
signal response is converted to digital information and stored in one trace memory which can then be transferred
the CRT display. The way in which the information is displayed depends upon the TRACE mode selected.
The analyzer's response is transferred into the trace memory at the sweep rate of the analyzer; that is, its sweep
time. The trace memory is written onto the CRT display at a refresh rate of about 50 Hz, rapid enough to prevent
flickering of the trace on the CRT Trace intensities remain constant as analyzer sweep times are changed.
36 Manual Operation
Sweeptime
TRACE MODES DETERMINE HOW DATA IS ENTERED INTO
AND DISPLAYED FROM TRACE MEMORIES
TRACE
Refresh
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