R&S FSH
Measurements using the power sensor
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E-11
Screen layout for power-sensor measurements:
Power sensor type
in use
Readout of
measured power
Analog readout of
measured power
Measurement time
Reference for
relative power
measurement
Measurement
frequency
0 dBm marker
for sensor input
level
Power offset
The power sensor has a memory containing frequency-dependent correction values. This means that
the highest accuracy is reached for signals whose frequency is known. If the R&S FSH switches over to
the power measurement mode from another operating mode, it uses the center frequency as the
frequency for the power sensor.
If you want to perform measurements on another known signal, the power sensor can be “told” what the
center frequency is via the frequency entry mode (FREQ softkey).
Press the FREQ softkey.
The frequency value entry box opens.
Using the number keys, enter the frequency you
want and confirm the entry with the ENTER key or
by pressing the FREQ softkey again.
The R&S FSH transfers the new frequency to the
power sensor which then corrects the measured power
readings.
Zeroing the power sensor
Offset voltages and currents have most effect on the power readout when low powers are being
measured. Zeroing is used to compensate for these offsets. The power sensor zeroes itself
automatically when instructed to do so by the user. No power may be applied when zeroing is being
performed, as the power sensor cannot distinguish between external powers and internal offsets.
