Setting and Using the Measurement Functions R&S FSH3
The R&S FSH3 displays the softkey menu for setting the channel power measurement. Two vertical
lines in the measurement diagram indicate the channel bandwidth. The measured channel power is
shown in large letters below the measurement diagram.
Channel bandwidth
Standard
Power readout
Channel
bandwidth display
The default setting is power measurement for 3GPP WCDMA signals.
Selecting the standard:
The R&S FSH3 has a channel power measurement default setting for various standards. It is also
possible to define and save user-specified configurations.
¾ Press the STANDARD softkey.
A submenu with the available standards opens.
¾ Select the standard you want using the rotary knob
or the cursor keys.
¾ Confirm your selection with the ENTER key or the
STANDARD softkey.
The R&S FSH3 sets the selected standard. The
optimal span, resolution bandwidth, video bandwidth,
sweep time and detector for the standard are selected
automatically.
If USER is selected, the R&S FSH3 sets the last channel power measurement setting used in the
USER mode. The R&S FSH3 automatically makes changes to the setting so that it is again available
when the USER standard is called again.
The following should be noted when changes to the settings are made:
• The span is always coupled to the channel bandwidth. When changes are made, the R&S FSH3
automatically sets the appropriate span.
• The resolution bandwidth should be between 1 % and 4 % of the channel bandwidth. This means
that the channel power measurement has good selectivity with respect to adjacent channels.
• The video bandwidth must be at least three times the resolution bandwidth. This prevents incorrect
results due to the compression of signal peaks by the video filter.
1145.5973.12 4.34 E-6
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