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Spectrum Analyzer Mode Key Descriptions
Spectrum Analyzer Mode Functions
The center frequency must be set to the intended carrier
frequency and the reference level set to optimize the
displayed signal. The channel bandwidth and channel
spacing must be entered by the user. If
PARAM
AUTO is
selected (so AUTO is underlined), other analyzer settings
will then be coupled and set automatically. The adjacent
channel power measurement responds to signals like an rms
power measurement. This means that the measurement of
the total channel power and the adjacent channel power
ratios are accurately reported, whether the transmitted
signal contains tones, noise, or both. If
PARAM
AUTO is
selected the parameters of the instrument state are set
for a valid measurement. When using
PARAM
MAN, the
following conditions must be maintained to make a valid rms
measurement. If these conditions are not met, errors of up
to -2.5
dB
can occur for noise-like signals.
l Video bandwidth is at least 10 times the resolution
bandwidth.
l Detector mode is sample (SMP). (You can use
DETECTOR
SMP
PK to select the detector mode.)
l Resolution bandwidth is less than or equal to 100
kHz.
l Video averaging is OFF.
l Neither MAX HOLD nor MIN HOLD trace mode is selected.
Front-Panel Key Access
C-1
ADJ CHAN
PWR
extd
measures the power leakage into the adjacent channels and
calculates the adjacent channel power ratio of both the
upper and lower channels, with respect to the reference
channel.
AD3
CHAN
POWER extd has an extended dynamic
range compared with
ADJ
CHAM POWER The extended
range is measured by taking two different sweeps with
different reference levels and combining the trace data. The
displayed dynamic range is 104
dB
and the log scale is set to
13 dB/ division.
6-10