Setting and Using the Measurement Functions R&S FSH3
¾ Press the MEAS TIME softkey.
The value entry box displaying the current
measurement time opens.
¾ Using the number keys, enter a new measurement
time and terminate the entry with the appropriate
unit, or
¾ Using the rotary knob or the cursor keys change
the measurement time and confirm with the
ENTER key or the MEAS TIME softkey.
If the measurement time you have entered is greater
than the sweep time, the R&S FSH3 outputs the
message "Maximum reached" and sets a
measurement time equal to the sweep time. If you
want to set a longer measurement time, you must
increase the sweep time first.
The minimum measurement time is the time
corresponding to one trace pixel (= sweep time /301).
Optimizing the reference level:
To obtain the greatest possible dynamic range for burst signals, the lowest reference level possible
must be set. If this is not done, the R&S FSH3 will be overdriven by the measurement signal, if its
maximum level exceeds the maximum reference level. Because the R&S FSH3’s resolution bandwidths
are implemented digitally after the A/D converter, depending on the resolution bandwidth selected, the
signal level at the A/D converter can be higher than the level indicated by the trace. To prevent the A/D
converter from being overdriven, the signal must be measured at the widest resolution bandwidth
(1 MHz) and video bandwidth (1 MHz) with the peak detector. The trace maximum then determines the
optimal reference level.
1145.5973.12 4.38 E-6
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