Chapter 4 249
Key Function Descriptions
Key Descriptions
MAX HOLD B Displays and holds the maximum responses of the
input signal in trace B. In this mode, the trace accepts
data from subsequent sweeps and selects the
positive-peak detector mode.
Front-panel key access:
TRACE
MAX MXR LEVEL Available with internal mixing only. Selects the
maximum signal amplitude seen at the input mixer.
This value is always in dBm, regardless of the selected
scale or units. MAX MIXER LEVEL is especially useful
when distortion-free dynamic range is an important
consideration. The following procedure explains how to
check for signal compression quickly. Press MAX MXR
LEVEL and increase the attenuation using the step
key. If the signal peak shifts more than 1 dB, the signal
is in compression. In this case, continue to increase the
attenuation until the peak moves less than 1 dB
between steps; then decrease the attenuation one step.
Front-panel key access:
AMPLITUDE
MEAS/USER Accesses the softkey functions that perform automatic
measurements and user defined function: fast Fourier
transform (FFT), occupied power bandwidth, carrier
power, channel power, the bandwidth at 3dB or 6 dB,
and the adjacent channel power (ACP) measurement.
Front-panel key access:
MEAS/USER
METHODS Allows you to select the measurement method that will
be used to make the adjacent channel power
measurement. These measurement methods have
different settable parameters. The different methods
are required for the various communications formats.
There are currently five different measurement
methods and these are described on the following
pages.
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