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The trace math function is executed on all subsequent
sweeps until it is turned off. An M appears on the left
edge of the display to indicate the function is active.
The display line is activated as a result of this function;
however, it can only be turned off by DSPL LIN ON
OFF. (DSPL LIN ON OFF can be accessed with
DISPLAY
Front-panel key access:
Exchanges the contents of trace A with the contents of
A EXCH B
trace B, and places both trace A and trace B in view
mode.
Front-panel key access:
Allows you to change the speed (acceleration) at which
ACCELRAT
different ACP measurements are made. Changing the
measurement speed affects each measurement method
in different ways.
ANALOG METHOD The sweep rate is increased by a
Chapter 4
.)
TRACE
TRACE
factor of two (faster acceleration) or
four (fastest acceleration) above that
used in normal analog measurements.
The center frequency of the spectrum
analyzer is shifted to compensate for
the expected shift in effective center
frequency from the faster sweep rate.
The amplitude of the transmitted
power result is modified to compensate
for its expected variation with sweep
rate.
Compensation is not done to the ACP
ratios because the compensation needs
for the adjacent and main channels
cancel in the ratio. The compensation is
not needed for noise-like signals, so
errors will occur in the transmitted
power result if the modulation is
noise-like. Errors will also occur in the
ACP ratio if the modulation is not
noise-like but the adjacent channel
power has significant noise-like power
components. Typical values for the
amplitude errors due to acceleration
are less than 0.02 dB for faster
acceleration and less than 0.10 dB for
fastest acceleration.
Key Function Descriptions
Key Descriptions
207
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