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Spectrum Analyzer Mode Key Descriptions
Spectrum Analyzer Mode Functions
PWRGRAPH
ON OFF
PWR SWP
ON OFF
turns the channel power graph ON or OFF. With the
PWRGRAPH ON, the channel powergraph is calculated and
displayed and the numeric results are not displayed. The
value of the channel power is displayed at the selected
marker frequency. This graph function is used after doing
a channel power measurement with the CHANNEL POWER
softkey.
Front-Panel Key Access
(jMEAS/USER]
option 011 only.
activates (ON) or deactivates (OFF) the power-sweep
function, which sweeps the output power of the tracking
generator over the selected power-sweep range. The value
of the power-sweep range is displayed in the active-function
block when PWR SWP ON OFF is turned on. The available
power-sweep range is a function of the source attenuator
setting: For power sweeps, press SRC ATN MAN AUTO until
(MAN) is underlined so the analyzer source attenuator is
manually set (decoupled). For a given source attenuation
setting, the maximum specified power-sweep range is given
by the following:
Power Sweep Range for the HP
8591C
cable TV analyzer is
(34
dBmV
minus the source attenuation setting) to (49
dBmV
minus the source attenuation setting). For example, if the
source attenuation setting is 20
dB,
the maximum power
sweep range is from 14
dBmV
(34
dBmV
-
20
dB)
to 29
dBmV
(49
dBmV
-
20
dB).
The starting power level is the
source power setting. The ending power level is the sum
of the source power setting plus the source power sweep
setting. Source power sweep may be set as high as 20
dB,
but performance is specified only up to 15
dB.
The output power of the tracking generator is swept
according to the sweep rate of the analyzer. The output
power is always swept from the source power setting to a
higher power setting (negative source power sweep values
are not allowed). Refer to the calibration guide for your
instrument for more information regarding source power and
source attenuation relationships.
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