7.2.1 Measurement configuration
Frequency
In Frequency sweep mode you can change either Start
frequency and Stop frequency or Center and Span.
Get from zoom updates Start frequency and Stop
frequency with the current zoom window range.
Furthermore, the sweep mode can be Linear or
Logarithmic and the number of points in the sweep can
be chosen.
In Fixed Frequency mode only the Source frequency
can be adjusted. In this case the Bode 100 will display a
vector chart instead of a frequency dependent chart.
Source level
Choose between a constant or variable output level
(shaped level) and set the source level. The variable
output level feature is only available in the Frequency
sweep measurement. It allows to define different source
levels for different frequency points. To learn more about
the source control, refer to 9.4 Signal source settings on
page 80.
Attenuators
Set the input attenuators for Receiver 1 (Channel
1) and Receiver 2 (Channel 2). If the measurement
mode supports two measurements (Transmission and
Reflection) you can set the attenuators for each
measurement. Possible attenuator values are 0 dB,
10 dB, 20 dB, 30 dB and 40 dB. Increase the
attenuators when you experience an overload, reduce
the attenuators to improve signal to noise ratio (see also
Choosing the receiver attenuator on page 78).
Receiver bandwidth
Set the maximum Receiver bandwidth used for the
measurement. Receiver bandwidth will be reduced
internally if the measurement frequency is smaller than
the Receiver bandwidth setting.
Select a high Receiver bandwidth to increase
measurement speed. Reduce Receiver bandwidth to
reduce noise and to catch narrow-band resonances.
More details can be found in Receiver Bandwidth on
page 76.
22
OMICRON Lab
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