Boonton 4541, Instruction Manual

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Boonton 4540 Series RF Power Meter
Operation
4-19
4.5.11 Channel > Extensions Pg 2 Menu (Modulated Mode)
This menu is page two of the channel extensions menu. This menu provides items to set video bandwidth, sensor correction
frequency, and peak hold. You can also access the alarms menu.
Main > Channel > Channel 1 | 2 > Extensions Pg 2 > Video BW
Description: Set the sensor video bandwidth for the selected sensor.
The trigger channel bandwidth is not affected. High is
the normal setting for most measurements. The actual
bandwidth is determined by the peak sensor model
used. Use low bandwidth for additional noise reduction
when measuring CW or signals with very low
modulation bandwidth. If Low bandwidth is used on
signals with fast modulation, measurement errors may
result because the sensor cannot track the fast changing
envelope of the signal. The sensor connected to the
channel must support video bandwidth switching. This
command is not valid for CW sensors or voltage
probes.
Menu Type: Toggle
.
Choices: High, Low
SCPI Command: SENSe[1|2]:BANDwidth <character data>
Main > Channel > Channel 1 | 2 > Extensions Pg2 > Peak Hold
Description: Set the operating mode of the selected channel’s peak
hold function. When set to OFF, instantaneous peak
readings are held for a short time, and then decayed
towards the average power at a rate proportional to the
filter time. This is the best setting for most signals,
because the peak will always represent the peak power
of the current signal, and the resulting peak-to-average ratio will be correct shortly after
any signal level changes. When set to ON, instantaneous peak readings are held until
reset by a new INITiate command or cleared manually. This setting is used when it is
desirable to hold the highest peak over a long measurement interval without any decay
Menu Type: Multiple Choice.
SCPI Command: CALCulate[1|2]:PKHLD <Boolean>
Fig. 4-14 Extensions Pg2
Menu (Modulated)