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R&S ZVH
Spectrum Analyzer Mode (R&S ZVH-K1)
Configuring Spectrum Measurements
Operating Manual 1309.6946.12 - 09
128
4.2.2.4 Setting a Reference Offset
You can define a reference offset for the reference level. With a reference offset, you
can increase the reference level by a certain amount. This is useful, for example, if an
attenuator or amplifier has been inserted before the RF input. The R&S ZVH
automatically takes the loss or gain into account when the level is displayed and no
manual calculations are necessary. A loss introduced at the RF input must be entered
as a positive number and a gain as a negative number.
► Press the SCALE/AMPT key.
► Press the "Ref Offset" softkey.
The R&S ZVH open an input field to
► Enter the offset you need.
The R&S ZVH includes the offset in the measurement.
To indicate an offset other than 0, the R&S ZVH puts a red dot at the "Ref:"
hardware setting (
).
4.2.2.5 Setting the RF Attenuation
RF attenuation adjusts the input range inside the analyzer. It is coupled directly to the
reference level. If you have set a high reference level, RF attenuation is turned on in
10 dB steps according to the table below so that the input mixer always remains in the
linear range.
The R&S ZVH provides three attenuation modes.
● Auto Low Distortion
If this mode is active, the R&S ZVH sets the RF attenuation 10 dB higher
according to the table below, making the stress of the input mixer 10 dB less at the
specified reference level. If the spectrum is densely occupied with signals, e.g. in a
television cable network, the input mixer reduces the R&S ZVH inherent spurious
products. However, the inherent noise display of the R&S ZVH increases due to
the increased attenuation in front of the input mixer.
● Auto Low Noise
If this mode is active, the R&S ZVH sets the RF attenuation 10 dB lower. This
increases the sensitivity of the R&S ZVH, which means that the inherent noise
display decreases due to the lower attenuation in front of the input mixer.
● Manual
Manual selection of the attenuation.
You can check the status of the RF attenuation and the preamplifier in the
measurement setup dialog and the hardware settings area of the display.