Setting and Using the Measurement Functions R&S FSH3
Power display:
The R&S FSH3 displays the power at the bottom of the measurement diagram (Power = nn.n dBm).
Usually the trace is not obscured. However, if the trace is in this area of the screen, the power readout
can be removed from the screen. Simply press the PWR DISP ON/OFF softkey. If the softkey label is
highlighted in green, the power readout is on.
Unit for power display:
The R&S FSH3 can use different units for power output. The basic unit is dBm.
¾ Press the PWR UNIT softkey.
The R&S FSH3 opens the submenu with the units:
dBm, dBmV and dBµV.
¾ Using the rotary knob or the cursor keys, select the
required unit.
¾ Confirm your selection with the ENTER key or the
PWR UNIT softkey.
The R&S FSH3 displays the power level in the
selected unit.
Power measurements on TDMA signals
When TDMA (time division multiple access) methods are used, e.g. for GSM, several users share a
channel. Each user is assigned a period of time or timeslot. The R&S FSH3’s TDMA POWER function
measures the power over one of these timeslots. This is a time-domain measurement (span = 0 Hz).
The power measurement is started on an external trigger or the video trigger. The power measurement
time is selected with MEAS TIME.
To prevent incorrect power measurements in the time domain, ensure that the whole signal lies within
the selected resolution bandwidth. If the resolution bandwidth is too narrow, the displayed power will be
lower than the actual power.
¾ Press the MEAS key.
¾ Press the MEASURE softkey.
The submenu for selecting the measurement functions
opens.
¾ Using the rotary knob or the cursor keys select the
TDMA POWER menu item.
¾ Confirm your selection with the ENTER key or the
MEAS softkey.
The R&S FSH3 displays the softkeys for configuring
time-domain power measurements.
1145.5973.12 4.36 E-6
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