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Levels page
Select
Level icon
from
Menu page
and short press
OK
button on it. The transition to
Levels page
will be made.
Levels page
shows bargraph representation of different parameters, measured by DB4005. The
parameters are shown in groups by four. Each bargraph displays averaged momentary value in
highlighted color number, minimum and maximum peak values. Shaded color number found on
the left and right bottom edges denotes the measurement range of the parameter. The name and
measurement unit of the parameter is shown above corresponding bargraph.
Group 1. This group shows RF carrier related parameters
RF level
in dBµV at the input. The attenuator position is taken into account
in level calculation;
Frequency offset
of the
RF carrier
in kHz. With this parameter the
misalignment between the modulation and demodulation frequency can be measured. As the
misalignment is expected to be small, a large offset indicates disturbance (for example adjacent
channel breakthrough).
Frequency offset
is measured with better accuracy if there is no modulation
of the carrier. The usable range depends of selected
IF filter bandwidth
. For best result set
IF filter
bandwidth
to 153 kHz (manual).
